Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

72 files changed, 34315 insertions, 0 deletions

diff --git a/arch/ia64/kernel/.gitignore b/arch/ia64/kernel/.gitignore
new file mode 100644
index 000000000..037482720
--- /dev/null
+++ b/arch/ia64/kernel/.gitignore
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+gate.lds
+vmlinux.lds
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
new file mode 100644
index 000000000..ae9ff07de
--- /dev/null
+++ b/arch/ia64/kernel/Makefile
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the linux kernel.
+#
+
+ifdef CONFIG_DYNAMIC_FTRACE
+CFLAGS_REMOVE_ftrace.o = -pg
+endif
+
+extra-y	:= vmlinux.lds
+
+obj-y := head.o entry.o efi.o efi_stub.o gate-data.o fsys.o irq.o irq_ia64.o	\
+	 irq_lsapic.o ivt.o pal.o patch.o process.o ptrace.o sal.o		\
+	 salinfo.o setup.o signal.o sys_ia64.o time.o traps.o unaligned.o \
+	 unwind.o mca.o mca_asm.o topology.o dma-mapping.o iosapic.o acpi.o \
+	 acpi-ext.o
+
+obj-$(CONFIG_IA64_BRL_EMU)	+= brl_emu.o
+
+obj-$(CONFIG_IA64_PALINFO)	+= palinfo.o
+obj-$(CONFIG_MODULES)		+= module.o
+obj-$(CONFIG_SMP)		+= smp.o smpboot.o
+obj-$(CONFIG_NUMA)		+= numa.o
+obj-$(CONFIG_IA64_CYCLONE)	+= cyclone.o
+obj-$(CONFIG_IA64_MCA_RECOVERY)	+= mca_recovery.o
+obj-$(CONFIG_KPROBES)		+= kprobes.o
+obj-$(CONFIG_DYNAMIC_FTRACE)	+= ftrace.o
+obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o crash.o
+obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
+obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR)	+= uncached.o
+obj-$(CONFIG_AUDIT)		+= audit.o
+obj-y				+= msi_ia64.o
+mca_recovery-y			+= mca_drv.o mca_drv_asm.o
+obj-$(CONFIG_IA64_MC_ERR_INJECT)+= err_inject.o
+obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
+
+obj-$(CONFIG_IA64_ESI)		+= esi.o esi_stub.o # must be in kernel proper
+obj-$(CONFIG_INTEL_IOMMU)	+= pci-dma.o
+
+obj-$(CONFIG_ELF_CORE)		+= elfcore.o
+
+# fp_emulate() expects f2-f5,f16-f31 to contain the user-level state.
+CFLAGS_traps.o  += -mfixed-range=f2-f5,f16-f31
+
+# The gate DSO image is built using a special linker script.
+include $(src)/Makefile.gate
diff --git a/arch/ia64/kernel/Makefile.gate b/arch/ia64/kernel/Makefile.gate
new file mode 100644
index 000000000..846867bff
--- /dev/null
+++ b/arch/ia64/kernel/Makefile.gate
@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-2.0
+# The gate DSO image is built using a special linker script.
+
+targets += gate.so gate.lds gate.o gate-dummy.o
+
+obj-y += gate-syms.o
+
+CPPFLAGS_gate.lds := -P -C -U$(ARCH)
+
+quiet_cmd_gate = GATE    $@
+      cmd_gate = $(CC) -nostdlib $(GATECFLAGS_$(@F)) -Wl,-T,$(filter-out FORCE,$^) -o $@
+
+GATECFLAGS_gate.so = -shared -s -Wl,-soname=linux-gate.so.1 \
+		     -Wl,--hash-style=sysv
+$(obj)/gate.so: $(obj)/gate.lds $(obj)/gate.o FORCE
+	$(call if_changed,gate)
+
+GATECFLAGS_gate-dummy.o = -r
+$(obj)/gate-dummy.o: $(obj)/gate.lds $(obj)/gate.o FORCE
+	$(call if_changed,gate)
+
+LDFLAGS_gate-syms.o := -r -R
+$(obj)/gate-syms.o: $(obj)/gate-dummy.o FORCE
+	$(call if_changed,ld)
+
+# gate-data.o contains the gate DSO image as data in section .data..gate.
+# We must build gate.so before we can assemble it.
+# Note: kbuild does not track this dependency due to usage of .incbin
+$(obj)/gate-data.o: $(obj)/gate.so
diff --git a/arch/ia64/kernel/acpi-ext.c b/arch/ia64/kernel/acpi-ext.c
new file mode 100644
index 000000000..42cd21480
--- /dev/null
+++ b/arch/ia64/kernel/acpi-ext.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.
+ *	Alex Williamson <alex.williamson@hp.com>
+ *	Bjorn Helgaas <bjorn.helgaas@hp.com>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+
+#include <asm/acpi-ext.h>
+
+/*
+ * Device CSRs that do not appear in PCI config space should be described
+ * via ACPI.  This would normally be done with Address Space Descriptors
+ * marked as "consumer-only," but old versions of Windows and Linux ignore
+ * the producer/consumer flag, so HP invented a vendor-defined resource to
+ * describe the location and size of CSR space.
+ */
+
+struct acpi_vendor_uuid hp_ccsr_uuid = {
+	.subtype = 2,
+	.data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a,
+	    0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad },
+};
+
+static acpi_status hp_ccsr_locate(acpi_handle obj, u64 *base, u64 *length)
+{
+	acpi_status status;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_resource *resource;
+	struct acpi_resource_vendor_typed *vendor;
+
+	status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid,
+		&buffer);
+
+	resource = buffer.pointer;
+	vendor = &resource->data.vendor_typed;
+
+	if (ACPI_FAILURE(status) || vendor->byte_length < 16) {
+		status = AE_NOT_FOUND;
+		goto exit;
+	}
+
+	memcpy(base, vendor->byte_data, sizeof(*base));
+	memcpy(length, vendor->byte_data + 8, sizeof(*length));
+
+  exit:
+	kfree(buffer.pointer);
+	return status;
+}
+
+struct csr_space {
+	u64	base;
+	u64	length;
+};
+
+static acpi_status find_csr_space(struct acpi_resource *resource, void *data)
+{
+	struct csr_space *space = data;
+	struct acpi_resource_address64 addr;
+	acpi_status status;
+
+	status = acpi_resource_to_address64(resource, &addr);
+	if (ACPI_SUCCESS(status) &&
+	    addr.resource_type == ACPI_MEMORY_RANGE &&
+	    addr.address.address_length &&
+	    addr.producer_consumer == ACPI_CONSUMER) {
+		space->base = addr.address.minimum;
+		space->length = addr.address.address_length;
+		return AE_CTRL_TERMINATE;
+	}
+	return AE_OK;		/* keep looking */
+}
+
+static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length)
+{
+	struct csr_space space = { 0, 0 };
+
+	acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space);
+	if (!space.length)
+		return AE_NOT_FOUND;
+
+	*base = space.base;
+	*length = space.length;
+	return AE_OK;
+}
+
+acpi_status hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
+{
+	acpi_status status;
+
+	status = hp_ccsr_locate(obj, csr_base, csr_length);
+	if (ACPI_SUCCESS(status))
+		return status;
+
+	return hp_crs_locate(obj, csr_base, csr_length);
+}
+EXPORT_SYMBOL(hp_acpi_csr_space);
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
new file mode 100644
index 000000000..96d13cb7c
--- /dev/null
+++ b/arch/ia64/kernel/acpi.c
@@ -0,0 +1,911 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  acpi.c - Architecture-Specific Low-Level ACPI Support
+ *
+ *  Copyright (C) 1999 VA Linux Systems
+ *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
+ *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *  Copyright (C) 2000 Intel Corp.
+ *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
+ *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
+ *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
+ *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
+ *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/irq.h>
+#include <linux/acpi.h>
+#include <linux/efi.h>
+#include <linux/mmzone.h>
+#include <linux/nodemask.h>
+#include <linux/slab.h>
+#include <acpi/processor.h>
+#include <asm/io.h>
+#include <asm/iosapic.h>
+#include <asm/page.h>
+#include <asm/numa.h>
+#include <asm/sal.h>
+#include <asm/cyclone.h>
+
+#define PREFIX			"ACPI: "
+
+int acpi_lapic;
+unsigned int acpi_cpei_override;
+unsigned int acpi_cpei_phys_cpuid;
+
+#define ACPI_MAX_PLATFORM_INTERRUPTS	256
+
+/* Array to record platform interrupt vectors for generic interrupt routing. */
+int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
+	[0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
+};
+
+enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
+
+/*
+ * Interrupt routing API for device drivers.  Provides interrupt vector for
+ * a generic platform event.  Currently only CPEI is implemented.
+ */
+int acpi_request_vector(u32 int_type)
+{
+	int vector = -1;
+
+	if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
+		/* corrected platform error interrupt */
+		vector = platform_intr_list[int_type];
+	} else
+		printk(KERN_ERR
+		       "acpi_request_vector(): invalid interrupt type\n");
+	return vector;
+}
+
+void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
+{
+	return __va(phys);
+}
+
+void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
+{
+}
+
+/* --------------------------------------------------------------------------
+                            Boot-time Table Parsing
+   -------------------------------------------------------------------------- */
+
+static int available_cpus __initdata;
+struct acpi_table_madt *acpi_madt __initdata;
+static u8 has_8259;
+
+static int __init
+acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
+			  const unsigned long end)
+{
+	struct acpi_madt_local_apic_override *lapic;
+
+	lapic = (struct acpi_madt_local_apic_override *)header;
+
+	if (BAD_MADT_ENTRY(lapic, end))
+		return -EINVAL;
+
+	if (lapic->address) {
+		iounmap(ipi_base_addr);
+		ipi_base_addr = ioremap(lapic->address, 0);
+	}
+	return 0;
+}
+
+static int __init
+acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
+{
+	struct acpi_madt_local_sapic *lsapic;
+
+	lsapic = (struct acpi_madt_local_sapic *)header;
+
+	/*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
+
+	if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
+#ifdef CONFIG_SMP
+		smp_boot_data.cpu_phys_id[available_cpus] =
+		    (lsapic->id << 8) | lsapic->eid;
+#endif
+		++available_cpus;
+	}
+
+	total_cpus++;
+	return 0;
+}
+
+static int __init
+acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
+{
+	struct acpi_madt_local_apic_nmi *lacpi_nmi;
+
+	lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
+
+	if (BAD_MADT_ENTRY(lacpi_nmi, end))
+		return -EINVAL;
+
+	/* TBD: Support lapic_nmi entries */
+	return 0;
+}
+
+static int __init
+acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
+{
+	struct acpi_madt_io_sapic *iosapic;
+
+	iosapic = (struct acpi_madt_io_sapic *)header;
+
+	if (BAD_MADT_ENTRY(iosapic, end))
+		return -EINVAL;
+
+	return iosapic_init(iosapic->address, iosapic->global_irq_base);
+}
+
+static unsigned int __initdata acpi_madt_rev;
+
+static int __init
+acpi_parse_plat_int_src(union acpi_subtable_headers * header,
+			const unsigned long end)
+{
+	struct acpi_madt_interrupt_source *plintsrc;
+	int vector;
+
+	plintsrc = (struct acpi_madt_interrupt_source *)header;
+
+	if (BAD_MADT_ENTRY(plintsrc, end))
+		return -EINVAL;
+
+	/*
+	 * Get vector assignment for this interrupt, set attributes,
+	 * and program the IOSAPIC routing table.
+	 */
+	vector = iosapic_register_platform_intr(plintsrc->type,
+						plintsrc->global_irq,
+						plintsrc->io_sapic_vector,
+						plintsrc->eid,
+						plintsrc->id,
+						((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
+						 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
+						IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
+						((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
+						 ACPI_MADT_TRIGGER_EDGE) ?
+						IOSAPIC_EDGE : IOSAPIC_LEVEL);
+
+	platform_intr_list[plintsrc->type] = vector;
+	if (acpi_madt_rev > 1) {
+		acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
+	}
+
+	/*
+	 * Save the physical id, so we can check when its being removed
+	 */
+	acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
+
+	return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+unsigned int can_cpei_retarget(void)
+{
+	extern int cpe_vector;
+	extern unsigned int force_cpei_retarget;
+
+	/*
+	 * Only if CPEI is supported and the override flag
+	 * is present, otherwise return that its re-targettable
+	 * if we are in polling mode.
+	 */
+	if (cpe_vector > 0) {
+		if (acpi_cpei_override || force_cpei_retarget)
+			return 1;
+		else
+			return 0;
+	}
+	return 1;
+}
+
+unsigned int is_cpu_cpei_target(unsigned int cpu)
+{
+	unsigned int logical_id;
+
+	logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
+
+	if (logical_id == cpu)
+		return 1;
+	else
+		return 0;
+}
+
+void set_cpei_target_cpu(unsigned int cpu)
+{
+	acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
+}
+#endif
+
+unsigned int get_cpei_target_cpu(void)
+{
+	return acpi_cpei_phys_cpuid;
+}
+
+static int __init
+acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
+		       const unsigned long end)
+{
+	struct acpi_madt_interrupt_override *p;
+
+	p = (struct acpi_madt_interrupt_override *)header;
+
+	if (BAD_MADT_ENTRY(p, end))
+		return -EINVAL;
+
+	iosapic_override_isa_irq(p->source_irq, p->global_irq,
+				 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
+				  ACPI_MADT_POLARITY_ACTIVE_LOW) ?
+				 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
+				 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
+				 ACPI_MADT_TRIGGER_LEVEL) ?
+				 IOSAPIC_LEVEL : IOSAPIC_EDGE);
+	return 0;
+}
+
+static int __init
+acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
+{
+	struct acpi_madt_nmi_source *nmi_src;
+
+	nmi_src = (struct acpi_madt_nmi_source *)header;
+
+	if (BAD_MADT_ENTRY(nmi_src, end))
+		return -EINVAL;
+
+	/* TBD: Support nimsrc entries */
+	return 0;
+}
+
+static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+	if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
+
+		/*
+		 * Unfortunately ITC_DRIFT is not yet part of the
+		 * official SAL spec, so the ITC_DRIFT bit is not
+		 * set by the BIOS on this hardware.
+		 */
+		sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
+
+		cyclone_setup();
+	}
+}
+
+static int __init acpi_parse_madt(struct acpi_table_header *table)
+{
+	acpi_madt = (struct acpi_table_madt *)table;
+
+	acpi_madt_rev = acpi_madt->header.revision;
+
+	/* remember the value for reference after free_initmem() */
+#ifdef CONFIG_ITANIUM
+	has_8259 = 1;		/* Firmware on old Itanium systems is broken */
+#else
+	has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
+#endif
+	iosapic_system_init(has_8259);
+
+	/* Get base address of IPI Message Block */
+
+	if (acpi_madt->address)
+		ipi_base_addr = ioremap(acpi_madt->address, 0);
+
+	printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
+
+	acpi_madt_oem_check(acpi_madt->header.oem_id,
+			    acpi_madt->header.oem_table_id);
+
+	return 0;
+}
+
+#ifdef CONFIG_ACPI_NUMA
+
+#undef SLIT_DEBUG
+
+#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
+
+static int __initdata srat_num_cpus;	/* number of cpus */
+static u32 pxm_flag[PXM_FLAG_LEN];
+#define pxm_bit_set(bit)	(set_bit(bit,(void *)pxm_flag))
+#define pxm_bit_test(bit)	(test_bit(bit,(void *)pxm_flag))
+static struct acpi_table_slit __initdata *slit_table;
+cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
+
+static int __init
+get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
+{
+	int pxm;
+
+	pxm = pa->proximity_domain_lo;
+	if (acpi_srat_revision >= 2)
+		pxm += pa->proximity_domain_hi[0] << 8;
+	return pxm;
+}
+
+static int __init
+get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
+{
+	int pxm;
+
+	pxm = ma->proximity_domain;
+	if (acpi_srat_revision <= 1)
+		pxm &= 0xff;
+
+	return pxm;
+}
+
+/*
+ * ACPI 2.0 SLIT (System Locality Information Table)
+ * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
+ */
+void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
+{
+	u32 len;
+
+	len = sizeof(struct acpi_table_header) + 8
+	    + slit->locality_count * slit->locality_count;
+	if (slit->header.length != len) {
+		printk(KERN_ERR
+		       "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
+		       len, slit->header.length);
+		return;
+	}
+	slit_table = slit;
+}
+
+void __init
+acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
+{
+	int pxm;
+
+	if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
+		return;
+
+	if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
+		printk_once(KERN_WARNING
+			    "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
+			    ARRAY_SIZE(node_cpuid));
+		return;
+	}
+	pxm = get_processor_proximity_domain(pa);
+
+	/* record this node in proximity bitmap */
+	pxm_bit_set(pxm);
+
+	node_cpuid[srat_num_cpus].phys_id =
+	    (pa->apic_id << 8) | (pa->local_sapic_eid);
+	/* nid should be overridden as logical node id later */
+	node_cpuid[srat_num_cpus].nid = pxm;
+	cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
+	srat_num_cpus++;
+}
+
+int __init
+acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
+{
+	unsigned long paddr, size;
+	int pxm;
+	struct node_memblk_s *p, *q, *pend;
+
+	pxm = get_memory_proximity_domain(ma);
+
+	/* fill node memory chunk structure */
+	paddr = ma->base_address;
+	size = ma->length;
+
+	/* Ignore disabled entries */
+	if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
+		return -1;
+
+	if (num_node_memblks >= NR_NODE_MEMBLKS) {
+		pr_err("NUMA: too many memblk ranges\n");
+		return -EINVAL;
+	}
+
+	/* record this node in proximity bitmap */
+	pxm_bit_set(pxm);
+
+	/* Insertion sort based on base address */
+	pend = &node_memblk[num_node_memblks];
+	for (p = &node_memblk[0]; p < pend; p++) {
+		if (paddr < p->start_paddr)
+			break;
+	}
+	if (p < pend) {
+		for (q = pend - 1; q >= p; q--)
+			*(q + 1) = *q;
+	}
+	p->start_paddr = paddr;
+	p->size = size;
+	p->nid = pxm;
+	num_node_memblks++;
+	return 0;
+}
+
+void __init acpi_numa_fixup(void)
+{
+	int i, j, node_from, node_to;
+
+	/* If there's no SRAT, fix the phys_id and mark node 0 online */
+	if (srat_num_cpus == 0) {
+		node_set_online(0);
+		node_cpuid[0].phys_id = hard_smp_processor_id();
+		slit_distance(0, 0) = LOCAL_DISTANCE;
+		goto out;
+	}
+
+	/*
+	 * MCD - This can probably be dropped now.  No need for pxm ID to node ID
+	 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
+	 */
+	nodes_clear(node_online_map);
+	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
+		if (pxm_bit_test(i)) {
+			int nid = acpi_map_pxm_to_node(i);
+			node_set_online(nid);
+		}
+	}
+
+	/* set logical node id in memory chunk structure */
+	for (i = 0; i < num_node_memblks; i++)
+		node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
+
+	/* assign memory bank numbers for each chunk on each node */
+	for_each_online_node(i) {
+		int bank;
+
+		bank = 0;
+		for (j = 0; j < num_node_memblks; j++)
+			if (node_memblk[j].nid == i)
+				node_memblk[j].bank = bank++;
+	}
+
+	/* set logical node id in cpu structure */
+	for_each_possible_early_cpu(i)
+		node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
+
+	printk(KERN_INFO "Number of logical nodes in system = %d\n",
+	       num_online_nodes());
+	printk(KERN_INFO "Number of memory chunks in system = %d\n",
+	       num_node_memblks);
+
+	if (!slit_table) {
+		for (i = 0; i < MAX_NUMNODES; i++)
+			for (j = 0; j < MAX_NUMNODES; j++)
+				slit_distance(i, j) = i == j ?
+					LOCAL_DISTANCE : REMOTE_DISTANCE;
+		goto out;
+	}
+
+	memset(numa_slit, -1, sizeof(numa_slit));
+	for (i = 0; i < slit_table->locality_count; i++) {
+		if (!pxm_bit_test(i))
+			continue;
+		node_from = pxm_to_node(i);
+		for (j = 0; j < slit_table->locality_count; j++) {
+			if (!pxm_bit_test(j))
+				continue;
+			node_to = pxm_to_node(j);
+			slit_distance(node_from, node_to) =
+			    slit_table->entry[i * slit_table->locality_count + j];
+		}
+	}
+
+#ifdef SLIT_DEBUG
+	printk("ACPI 2.0 SLIT locality table:\n");
+	for_each_online_node(i) {
+		for_each_online_node(j)
+		    printk("%03d ", node_distance(i, j));
+		printk("\n");
+	}
+#endif
+out:
+	node_possible_map = node_online_map;
+}
+#endif				/* CONFIG_ACPI_NUMA */
+
+/*
+ * success: return IRQ number (>=0)
+ * failure: return < 0
+ */
+int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
+{
+	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
+		return gsi;
+
+	if (has_8259 && gsi < 16)
+		return isa_irq_to_vector(gsi);
+
+	return iosapic_register_intr(gsi,
+				     (polarity ==
+				      ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
+				     IOSAPIC_POL_LOW,
+				     (triggering ==
+				      ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
+				     IOSAPIC_LEVEL);
+}
+EXPORT_SYMBOL_GPL(acpi_register_gsi);
+
+void acpi_unregister_gsi(u32 gsi)
+{
+	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
+		return;
+
+	if (has_8259 && gsi < 16)
+		return;
+
+	iosapic_unregister_intr(gsi);
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
+
+static int __init acpi_parse_fadt(struct acpi_table_header *table)
+{
+	struct acpi_table_header *fadt_header;
+	struct acpi_table_fadt *fadt;
+
+	fadt_header = (struct acpi_table_header *)table;
+	if (fadt_header->revision != 3)
+		return -ENODEV;	/* Only deal with ACPI 2.0 FADT */
+
+	fadt = (struct acpi_table_fadt *)fadt_header;
+
+	acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
+				 ACPI_ACTIVE_LOW);
+	return 0;
+}
+
+int __init early_acpi_boot_init(void)
+{
+	int ret;
+
+	/*
+	 * do a partial walk of MADT to determine how many CPUs
+	 * we have including offline CPUs
+	 */
+	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
+		printk(KERN_ERR PREFIX "Can't find MADT\n");
+		return 0;
+	}
+
+	ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
+		acpi_parse_lsapic, NR_CPUS);
+	if (ret < 1)
+		printk(KERN_ERR PREFIX
+		       "Error parsing MADT - no LAPIC entries\n");
+	else
+		acpi_lapic = 1;
+
+#ifdef CONFIG_SMP
+	if (available_cpus == 0) {
+		printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
+		printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
+		smp_boot_data.cpu_phys_id[available_cpus] =
+		    hard_smp_processor_id();
+		available_cpus = 1;	/* We've got at least one of these, no? */
+	}
+	smp_boot_data.cpu_count = available_cpus;
+#endif
+	/* Make boot-up look pretty */
+	printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
+	       total_cpus);
+
+	return 0;
+}
+
+int __init acpi_boot_init(void)
+{
+
+	/*
+	 * MADT
+	 * ----
+	 * Parse the Multiple APIC Description Table (MADT), if exists.
+	 * Note that this table provides platform SMP configuration
+	 * information -- the successor to MPS tables.
+	 */
+
+	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
+		printk(KERN_ERR PREFIX "Can't find MADT\n");
+		goto skip_madt;
+	}
+
+	/* Local APIC */
+
+	if (acpi_table_parse_madt
+	    (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
+		printk(KERN_ERR PREFIX
+		       "Error parsing LAPIC address override entry\n");
+
+	if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
+	    < 0)
+		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
+
+	/* I/O APIC */
+
+	if (acpi_table_parse_madt
+	    (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
+		printk(KERN_ERR PREFIX
+		       "Error parsing MADT - no IOSAPIC entries\n");
+	}
+
+	/* System-Level Interrupt Routing */
+
+	if (acpi_table_parse_madt
+	    (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
+	     ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
+		printk(KERN_ERR PREFIX
+		       "Error parsing platform interrupt source entry\n");
+
+	if (acpi_table_parse_madt
+	    (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
+		printk(KERN_ERR PREFIX
+		       "Error parsing interrupt source overrides entry\n");
+
+	if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
+		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
+      skip_madt:
+
+	/*
+	 * FADT says whether a legacy keyboard controller is present.
+	 * The FADT also contains an SCI_INT line, by which the system
+	 * gets interrupts such as power and sleep buttons.  If it's not
+	 * on a Legacy interrupt, it needs to be setup.
+	 */
+	if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
+		printk(KERN_ERR PREFIX "Can't find FADT\n");
+
+#ifdef CONFIG_ACPI_NUMA
+#ifdef CONFIG_SMP
+	if (srat_num_cpus == 0) {
+		int cpu, i = 1;
+		for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
+			if (smp_boot_data.cpu_phys_id[cpu] !=
+			    hard_smp_processor_id())
+				node_cpuid[i++].phys_id =
+				    smp_boot_data.cpu_phys_id[cpu];
+	}
+#endif
+	build_cpu_to_node_map();
+#endif
+	return 0;
+}
+
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+	int tmp;
+
+	if (has_8259 && gsi < 16)
+		*irq = isa_irq_to_vector(gsi);
+	else {
+		tmp = gsi_to_irq(gsi);
+		if (tmp == -1)
+			return -1;
+		*irq = tmp;
+	}
+	return 0;
+}
+
+int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
+{
+	if (isa_irq >= 16)
+		return -1;
+	*gsi = isa_irq;
+	return 0;
+}
+
+/*
+ *  ACPI based hotplug CPU support
+ */
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
+{
+#ifdef CONFIG_ACPI_NUMA
+	/*
+	 * We don't have cpu-only-node hotadd. But if the system equips
+	 * SRAT table, pxm is already found and node is ready.
+  	 * So, just pxm_to_nid(pxm) is OK.
+	 * This code here is for the system which doesn't have full SRAT
+  	 * table for possible cpus.
+	 */
+	node_cpuid[cpu].phys_id = physid;
+	node_cpuid[cpu].nid = acpi_get_node(handle);
+#endif
+	return 0;
+}
+
+int additional_cpus __initdata = -1;
+
+static __init int setup_additional_cpus(char *s)
+{
+	if (s)
+		additional_cpus = simple_strtol(s, NULL, 0);
+
+	return 0;
+}
+
+early_param("additional_cpus", setup_additional_cpus);
+
+/*
+ * cpu_possible_mask should be static, it cannot change as CPUs
+ * are onlined, or offlined. The reason is per-cpu data-structures
+ * are allocated by some modules at init time, and dont expect to
+ * do this dynamically on cpu arrival/departure.
+ * cpu_present_mask on the other hand can change dynamically.
+ * In case when cpu_hotplug is not compiled, then we resort to current
+ * behaviour, which is cpu_possible == cpu_present.
+ * - Ashok Raj
+ *
+ * Three ways to find out the number of additional hotplug CPUs:
+ * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
+ * - The user can overwrite it with additional_cpus=NUM
+ * - Otherwise don't reserve additional CPUs.
+ */
+__init void prefill_possible_map(void)
+{
+	int i;
+	int possible, disabled_cpus;
+
+	disabled_cpus = total_cpus - available_cpus;
+
+ 	if (additional_cpus == -1) {
+ 		if (disabled_cpus > 0)
+			additional_cpus = disabled_cpus;
+ 		else
+			additional_cpus = 0;
+ 	}
+
+	possible = available_cpus + additional_cpus;
+
+	if (possible > nr_cpu_ids)
+		possible = nr_cpu_ids;
+
+	printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
+		possible, max((possible - available_cpus), 0));
+
+	for (i = 0; i < possible; i++)
+		set_cpu_possible(i, true);
+}
+
+static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
+{
+	cpumask_t tmp_map;
+	int cpu;
+
+	cpumask_complement(&tmp_map, cpu_present_mask);
+	cpu = cpumask_first(&tmp_map);
+	if (cpu >= nr_cpu_ids)
+		return -EINVAL;
+
+	acpi_map_cpu2node(handle, cpu, physid);
+
+	set_cpu_present(cpu, true);
+	ia64_cpu_to_sapicid[cpu] = physid;
+
+	acpi_processor_set_pdc(handle);
+
+	*pcpu = cpu;
+	return (0);
+}
+
+/* wrapper to silence section mismatch warning */
+int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
+		       int *pcpu)
+{
+	return _acpi_map_lsapic(handle, physid, pcpu);
+}
+EXPORT_SYMBOL(acpi_map_cpu);
+
+int acpi_unmap_cpu(int cpu)
+{
+	ia64_cpu_to_sapicid[cpu] = -1;
+	set_cpu_present(cpu, false);
+
+#ifdef CONFIG_ACPI_NUMA
+	/* NUMA specific cleanup's */
+#endif
+
+	return (0);
+}
+EXPORT_SYMBOL(acpi_unmap_cpu);
+#endif				/* CONFIG_ACPI_HOTPLUG_CPU */
+
+#ifdef CONFIG_ACPI_NUMA
+static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
+				    void *context, void **ret)
+{
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	struct acpi_madt_io_sapic *iosapic;
+	unsigned int gsi_base;
+	int node;
+
+	/* Only care about objects w/ a method that returns the MADT */
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
+		return AE_OK;
+
+	if (!buffer.length || !buffer.pointer)
+		return AE_OK;
+
+	obj = buffer.pointer;
+	if (obj->type != ACPI_TYPE_BUFFER ||
+	    obj->buffer.length < sizeof(*iosapic)) {
+		kfree(buffer.pointer);
+		return AE_OK;
+	}
+
+	iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
+
+	if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
+		kfree(buffer.pointer);
+		return AE_OK;
+	}
+
+	gsi_base = iosapic->global_irq_base;
+
+	kfree(buffer.pointer);
+
+	/* OK, it's an IOSAPIC MADT entry; associate it with a node */
+	node = acpi_get_node(handle);
+	if (node == NUMA_NO_NODE || !node_online(node) ||
+	    cpumask_empty(cpumask_of_node(node)))
+		return AE_OK;
+
+	/* We know a gsi to node mapping! */
+	map_iosapic_to_node(gsi_base, node);
+	return AE_OK;
+}
+
+static int __init
+acpi_map_iosapics (void)
+{
+	acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
+	return 0;
+}
+
+fs_initcall(acpi_map_iosapics);
+#endif				/* CONFIG_ACPI_NUMA */
+
+int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
+{
+	int err;
+
+	if ((err = iosapic_init(phys_addr, gsi_base)))
+		return err;
+
+#ifdef CONFIG_ACPI_NUMA
+	acpi_map_iosapic(handle, 0, NULL, NULL);
+#endif				/* CONFIG_ACPI_NUMA */
+
+	return 0;
+}
+
+EXPORT_SYMBOL(acpi_register_ioapic);
+
+int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
+{
+	return iosapic_remove(gsi_base);
+}
+
+EXPORT_SYMBOL(acpi_unregister_ioapic);
+
+/*
+ * acpi_suspend_lowlevel() - save kernel state and suspend.
+ *
+ * TBD when IA64 starts to support suspend...
+ */
+int acpi_suspend_lowlevel(void) { return 0; }
diff --git a/arch/ia64/kernel/asm-offsets.c b/arch/ia64/kernel/asm-offsets.c
new file mode 100644
index 000000000..be3b90fef
--- /dev/null
+++ b/arch/ia64/kernel/asm-offsets.c
@@ -0,0 +1,289 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generate definitions needed by assembly language modules.
+ * This code generates raw asm output which is post-processed
+ * to extract and format the required data.
+ */
+
+#define ASM_OFFSETS_C 1
+
+#include <linux/sched/signal.h>
+#include <linux/pid.h>
+#include <linux/clocksource.h>
+#include <linux/kbuild.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/siginfo.h>
+#include <asm/sigcontext.h>
+#include <asm/mca.h>
+
+#include "../kernel/sigframe.h"
+#include "../kernel/fsyscall_gtod_data.h"
+
+void foo(void)
+{
+	DEFINE(IA64_TASK_SIZE, sizeof (struct task_struct));
+	DEFINE(IA64_THREAD_INFO_SIZE, sizeof (struct thread_info));
+	DEFINE(IA64_PT_REGS_SIZE, sizeof (struct pt_regs));
+	DEFINE(IA64_SWITCH_STACK_SIZE, sizeof (struct switch_stack));
+	DEFINE(IA64_SIGINFO_SIZE, sizeof (struct siginfo));
+	DEFINE(IA64_CPU_SIZE, sizeof (struct cpuinfo_ia64));
+	DEFINE(SIGFRAME_SIZE, sizeof (struct sigframe));
+	DEFINE(UNW_FRAME_INFO_SIZE, sizeof (struct unw_frame_info));
+
+	BUILD_BUG_ON(sizeof(struct upid) != 16);
+	DEFINE(IA64_UPID_SHIFT, 4);
+
+	BLANK();
+
+	DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
+	DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
+	DEFINE(TI_PRE_COUNT, offsetof(struct thread_info, preempt_count));
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	DEFINE(TI_AC_STAMP, offsetof(struct thread_info, ac_stamp));
+	DEFINE(TI_AC_LEAVE, offsetof(struct thread_info, ac_leave));
+	DEFINE(TI_AC_STIME, offsetof(struct thread_info, ac_stime));
+	DEFINE(TI_AC_UTIME, offsetof(struct thread_info, ac_utime));
+#endif
+
+	BLANK();
+
+	DEFINE(IA64_TASK_BLOCKED_OFFSET,offsetof (struct task_struct, blocked));
+	DEFINE(IA64_TASK_CLEAR_CHILD_TID_OFFSET,offsetof (struct task_struct, clear_child_tid));
+	DEFINE(IA64_TASK_THREAD_PID_OFFSET,offsetof (struct task_struct, thread_pid));
+	DEFINE(IA64_PID_LEVEL_OFFSET, offsetof (struct pid, level));
+	DEFINE(IA64_PID_UPID_OFFSET, offsetof (struct pid, numbers[0]));
+	DEFINE(IA64_TASK_PENDING_OFFSET,offsetof (struct task_struct, pending));
+	DEFINE(IA64_TASK_PID_OFFSET, offsetof (struct task_struct, pid));
+	DEFINE(IA64_TASK_REAL_PARENT_OFFSET, offsetof (struct task_struct, real_parent));
+	DEFINE(IA64_TASK_SIGNAL_OFFSET,offsetof (struct task_struct, signal));
+	DEFINE(IA64_TASK_TGID_OFFSET, offsetof (struct task_struct, tgid));
+	DEFINE(IA64_TASK_THREAD_KSP_OFFSET, offsetof (struct task_struct, thread.ksp));
+	DEFINE(IA64_TASK_THREAD_ON_USTACK_OFFSET, offsetof (struct task_struct, thread.on_ustack));
+
+	BLANK();
+
+
+	DEFINE(IA64_SIGNAL_GROUP_STOP_COUNT_OFFSET,offsetof (struct signal_struct,
+							     group_stop_count));
+	DEFINE(IA64_SIGNAL_SHARED_PENDING_OFFSET,offsetof (struct signal_struct, shared_pending));
+	DEFINE(IA64_SIGNAL_PIDS_TGID_OFFSET, offsetof (struct signal_struct, pids[PIDTYPE_TGID]));
+
+	BLANK();
+
+	DEFINE(IA64_PT_REGS_B6_OFFSET, offsetof (struct pt_regs, b6));
+	DEFINE(IA64_PT_REGS_B7_OFFSET, offsetof (struct pt_regs, b7));
+	DEFINE(IA64_PT_REGS_AR_CSD_OFFSET, offsetof (struct pt_regs, ar_csd));
+	DEFINE(IA64_PT_REGS_AR_SSD_OFFSET, offsetof (struct pt_regs, ar_ssd));
+	DEFINE(IA64_PT_REGS_R8_OFFSET, offsetof (struct pt_regs, r8));
+	DEFINE(IA64_PT_REGS_R9_OFFSET, offsetof (struct pt_regs, r9));
+	DEFINE(IA64_PT_REGS_R10_OFFSET, offsetof (struct pt_regs, r10));
+	DEFINE(IA64_PT_REGS_R11_OFFSET, offsetof (struct pt_regs, r11));
+	DEFINE(IA64_PT_REGS_CR_IPSR_OFFSET, offsetof (struct pt_regs, cr_ipsr));
+	DEFINE(IA64_PT_REGS_CR_IIP_OFFSET, offsetof (struct pt_regs, cr_iip));
+	DEFINE(IA64_PT_REGS_CR_IFS_OFFSET, offsetof (struct pt_regs, cr_ifs));
+	DEFINE(IA64_PT_REGS_AR_UNAT_OFFSET, offsetof (struct pt_regs, ar_unat));
+	DEFINE(IA64_PT_REGS_AR_PFS_OFFSET, offsetof (struct pt_regs, ar_pfs));
+	DEFINE(IA64_PT_REGS_AR_RSC_OFFSET, offsetof (struct pt_regs, ar_rsc));
+	DEFINE(IA64_PT_REGS_AR_RNAT_OFFSET, offsetof (struct pt_regs, ar_rnat));
+
+	DEFINE(IA64_PT_REGS_AR_BSPSTORE_OFFSET, offsetof (struct pt_regs, ar_bspstore));
+	DEFINE(IA64_PT_REGS_PR_OFFSET, offsetof (struct pt_regs, pr));
+	DEFINE(IA64_PT_REGS_B0_OFFSET, offsetof (struct pt_regs, b0));
+	DEFINE(IA64_PT_REGS_LOADRS_OFFSET, offsetof (struct pt_regs, loadrs));
+	DEFINE(IA64_PT_REGS_R1_OFFSET, offsetof (struct pt_regs, r1));
+	DEFINE(IA64_PT_REGS_R12_OFFSET, offsetof (struct pt_regs, r12));
+	DEFINE(IA64_PT_REGS_R13_OFFSET, offsetof (struct pt_regs, r13));
+	DEFINE(IA64_PT_REGS_AR_FPSR_OFFSET, offsetof (struct pt_regs, ar_fpsr));
+	DEFINE(IA64_PT_REGS_R15_OFFSET, offsetof (struct pt_regs, r15));
+	DEFINE(IA64_PT_REGS_R14_OFFSET, offsetof (struct pt_regs, r14));
+	DEFINE(IA64_PT_REGS_R2_OFFSET, offsetof (struct pt_regs, r2));
+	DEFINE(IA64_PT_REGS_R3_OFFSET, offsetof (struct pt_regs, r3));
+	DEFINE(IA64_PT_REGS_R16_OFFSET, offsetof (struct pt_regs, r16));
+	DEFINE(IA64_PT_REGS_R17_OFFSET, offsetof (struct pt_regs, r17));
+	DEFINE(IA64_PT_REGS_R18_OFFSET, offsetof (struct pt_regs, r18));
+	DEFINE(IA64_PT_REGS_R19_OFFSET, offsetof (struct pt_regs, r19));
+	DEFINE(IA64_PT_REGS_R20_OFFSET, offsetof (struct pt_regs, r20));
+	DEFINE(IA64_PT_REGS_R21_OFFSET, offsetof (struct pt_regs, r21));
+	DEFINE(IA64_PT_REGS_R22_OFFSET, offsetof (struct pt_regs, r22));
+	DEFINE(IA64_PT_REGS_R23_OFFSET, offsetof (struct pt_regs, r23));
+	DEFINE(IA64_PT_REGS_R24_OFFSET, offsetof (struct pt_regs, r24));
+	DEFINE(IA64_PT_REGS_R25_OFFSET, offsetof (struct pt_regs, r25));
+	DEFINE(IA64_PT_REGS_R26_OFFSET, offsetof (struct pt_regs, r26));
+	DEFINE(IA64_PT_REGS_R27_OFFSET, offsetof (struct pt_regs, r27));
+	DEFINE(IA64_PT_REGS_R28_OFFSET, offsetof (struct pt_regs, r28));
+	DEFINE(IA64_PT_REGS_R29_OFFSET, offsetof (struct pt_regs, r29));
+	DEFINE(IA64_PT_REGS_R30_OFFSET, offsetof (struct pt_regs, r30));
+	DEFINE(IA64_PT_REGS_R31_OFFSET, offsetof (struct pt_regs, r31));
+	DEFINE(IA64_PT_REGS_AR_CCV_OFFSET, offsetof (struct pt_regs, ar_ccv));
+	DEFINE(IA64_PT_REGS_F6_OFFSET, offsetof (struct pt_regs, f6));
+	DEFINE(IA64_PT_REGS_F7_OFFSET, offsetof (struct pt_regs, f7));
+	DEFINE(IA64_PT_REGS_F8_OFFSET, offsetof (struct pt_regs, f8));
+	DEFINE(IA64_PT_REGS_F9_OFFSET, offsetof (struct pt_regs, f9));
+	DEFINE(IA64_PT_REGS_F10_OFFSET, offsetof (struct pt_regs, f10));
+	DEFINE(IA64_PT_REGS_F11_OFFSET, offsetof (struct pt_regs, f11));
+
+	BLANK();
+
+	DEFINE(IA64_SWITCH_STACK_CALLER_UNAT_OFFSET, offsetof (struct switch_stack, caller_unat));
+	DEFINE(IA64_SWITCH_STACK_AR_FPSR_OFFSET, offsetof (struct switch_stack, ar_fpsr));
+	DEFINE(IA64_SWITCH_STACK_F2_OFFSET, offsetof (struct switch_stack, f2));
+	DEFINE(IA64_SWITCH_STACK_F3_OFFSET, offsetof (struct switch_stack, f3));
+	DEFINE(IA64_SWITCH_STACK_F4_OFFSET, offsetof (struct switch_stack, f4));
+	DEFINE(IA64_SWITCH_STACK_F5_OFFSET, offsetof (struct switch_stack, f5));
+	DEFINE(IA64_SWITCH_STACK_F12_OFFSET, offsetof (struct switch_stack, f12));
+	DEFINE(IA64_SWITCH_STACK_F13_OFFSET, offsetof (struct switch_stack, f13));
+	DEFINE(IA64_SWITCH_STACK_F14_OFFSET, offsetof (struct switch_stack, f14));
+	DEFINE(IA64_SWITCH_STACK_F15_OFFSET, offsetof (struct switch_stack, f15));
+	DEFINE(IA64_SWITCH_STACK_F16_OFFSET, offsetof (struct switch_stack, f16));
+	DEFINE(IA64_SWITCH_STACK_F17_OFFSET, offsetof (struct switch_stack, f17));
+	DEFINE(IA64_SWITCH_STACK_F18_OFFSET, offsetof (struct switch_stack, f18));
+	DEFINE(IA64_SWITCH_STACK_F19_OFFSET, offsetof (struct switch_stack, f19));
+	DEFINE(IA64_SWITCH_STACK_F20_OFFSET, offsetof (struct switch_stack, f20));
+	DEFINE(IA64_SWITCH_STACK_F21_OFFSET, offsetof (struct switch_stack, f21));
+	DEFINE(IA64_SWITCH_STACK_F22_OFFSET, offsetof (struct switch_stack, f22));
+	DEFINE(IA64_SWITCH_STACK_F23_OFFSET, offsetof (struct switch_stack, f23));
+	DEFINE(IA64_SWITCH_STACK_F24_OFFSET, offsetof (struct switch_stack, f24));
+	DEFINE(IA64_SWITCH_STACK_F25_OFFSET, offsetof (struct switch_stack, f25));
+	DEFINE(IA64_SWITCH_STACK_F26_OFFSET, offsetof (struct switch_stack, f26));
+	DEFINE(IA64_SWITCH_STACK_F27_OFFSET, offsetof (struct switch_stack, f27));
+	DEFINE(IA64_SWITCH_STACK_F28_OFFSET, offsetof (struct switch_stack, f28));
+	DEFINE(IA64_SWITCH_STACK_F29_OFFSET, offsetof (struct switch_stack, f29));
+	DEFINE(IA64_SWITCH_STACK_F30_OFFSET, offsetof (struct switch_stack, f30));
+	DEFINE(IA64_SWITCH_STACK_F31_OFFSET, offsetof (struct switch_stack, f31));
+	DEFINE(IA64_SWITCH_STACK_R4_OFFSET, offsetof (struct switch_stack, r4));
+	DEFINE(IA64_SWITCH_STACK_R5_OFFSET, offsetof (struct switch_stack, r5));
+	DEFINE(IA64_SWITCH_STACK_R6_OFFSET, offsetof (struct switch_stack, r6));
+	DEFINE(IA64_SWITCH_STACK_R7_OFFSET, offsetof (struct switch_stack, r7));
+	DEFINE(IA64_SWITCH_STACK_B0_OFFSET, offsetof (struct switch_stack, b0));
+	DEFINE(IA64_SWITCH_STACK_B1_OFFSET, offsetof (struct switch_stack, b1));
+	DEFINE(IA64_SWITCH_STACK_B2_OFFSET, offsetof (struct switch_stack, b2));
+	DEFINE(IA64_SWITCH_STACK_B3_OFFSET, offsetof (struct switch_stack, b3));
+	DEFINE(IA64_SWITCH_STACK_B4_OFFSET, offsetof (struct switch_stack, b4));
+	DEFINE(IA64_SWITCH_STACK_B5_OFFSET, offsetof (struct switch_stack, b5));
+	DEFINE(IA64_SWITCH_STACK_AR_PFS_OFFSET, offsetof (struct switch_stack, ar_pfs));
+	DEFINE(IA64_SWITCH_STACK_AR_LC_OFFSET, offsetof (struct switch_stack, ar_lc));
+	DEFINE(IA64_SWITCH_STACK_AR_UNAT_OFFSET, offsetof (struct switch_stack, ar_unat));
+	DEFINE(IA64_SWITCH_STACK_AR_RNAT_OFFSET, offsetof (struct switch_stack, ar_rnat));
+	DEFINE(IA64_SWITCH_STACK_AR_BSPSTORE_OFFSET, offsetof (struct switch_stack, ar_bspstore));
+	DEFINE(IA64_SWITCH_STACK_PR_OFFSET, offsetof (struct switch_stack, pr));
+
+	BLANK();
+
+	DEFINE(IA64_SIGCONTEXT_IP_OFFSET, offsetof (struct sigcontext, sc_ip));
+	DEFINE(IA64_SIGCONTEXT_AR_BSP_OFFSET, offsetof (struct sigcontext, sc_ar_bsp));
+	DEFINE(IA64_SIGCONTEXT_AR_FPSR_OFFSET, offsetof (struct sigcontext, sc_ar_fpsr));
+	DEFINE(IA64_SIGCONTEXT_AR_RNAT_OFFSET, offsetof (struct sigcontext, sc_ar_rnat));
+	DEFINE(IA64_SIGCONTEXT_AR_UNAT_OFFSET, offsetof (struct sigcontext, sc_ar_unat));
+	DEFINE(IA64_SIGCONTEXT_B0_OFFSET, offsetof (struct sigcontext, sc_br[0]));
+	DEFINE(IA64_SIGCONTEXT_CFM_OFFSET, offsetof (struct sigcontext, sc_cfm));
+	DEFINE(IA64_SIGCONTEXT_FLAGS_OFFSET, offsetof (struct sigcontext, sc_flags));
+	DEFINE(IA64_SIGCONTEXT_FR6_OFFSET, offsetof (struct sigcontext, sc_fr[6]));
+	DEFINE(IA64_SIGCONTEXT_PR_OFFSET, offsetof (struct sigcontext, sc_pr));
+	DEFINE(IA64_SIGCONTEXT_R12_OFFSET, offsetof (struct sigcontext, sc_gr[12]));
+	DEFINE(IA64_SIGCONTEXT_RBS_BASE_OFFSET,offsetof (struct sigcontext, sc_rbs_base));
+	DEFINE(IA64_SIGCONTEXT_LOADRS_OFFSET, offsetof (struct sigcontext, sc_loadrs));
+
+	BLANK();
+
+	DEFINE(IA64_SIGPENDING_SIGNAL_OFFSET, offsetof (struct sigpending, signal));
+
+	BLANK();
+
+	DEFINE(IA64_SIGFRAME_ARG0_OFFSET, offsetof (struct sigframe, arg0));
+	DEFINE(IA64_SIGFRAME_ARG1_OFFSET, offsetof (struct sigframe, arg1));
+	DEFINE(IA64_SIGFRAME_ARG2_OFFSET, offsetof (struct sigframe, arg2));
+	DEFINE(IA64_SIGFRAME_HANDLER_OFFSET, offsetof (struct sigframe, handler));
+	DEFINE(IA64_SIGFRAME_SIGCONTEXT_OFFSET, offsetof (struct sigframe, sc));
+	BLANK();
+    /* for assembly files which can't include sched.h: */
+	DEFINE(IA64_CLONE_VFORK, CLONE_VFORK);
+	DEFINE(IA64_CLONE_VM, CLONE_VM);
+
+	BLANK();
+	DEFINE(IA64_CPUINFO_NSEC_PER_CYC_OFFSET,
+	       offsetof (struct cpuinfo_ia64, nsec_per_cyc));
+	DEFINE(IA64_CPUINFO_PTCE_BASE_OFFSET,
+	       offsetof (struct cpuinfo_ia64, ptce_base));
+	DEFINE(IA64_CPUINFO_PTCE_COUNT_OFFSET,
+	       offsetof (struct cpuinfo_ia64, ptce_count));
+	DEFINE(IA64_CPUINFO_PTCE_STRIDE_OFFSET,
+	       offsetof (struct cpuinfo_ia64, ptce_stride));
+	BLANK();
+	DEFINE(IA64_TIMESPEC_TV_NSEC_OFFSET,
+	       offsetof (struct __kernel_old_timespec, tv_nsec));
+	DEFINE(IA64_TIME_SN_SPEC_SNSEC_OFFSET,
+	       offsetof (struct time_sn_spec, snsec));
+
+	DEFINE(CLONE_SETTLS_BIT, 19);
+#if CLONE_SETTLS != (1<<19)
+# error "CLONE_SETTLS_BIT incorrect, please fix"
+#endif
+
+	BLANK();
+	DEFINE(IA64_MCA_CPU_MCA_STACK_OFFSET,
+	       offsetof (struct ia64_mca_cpu, mca_stack));
+	DEFINE(IA64_MCA_CPU_INIT_STACK_OFFSET,
+	       offsetof (struct ia64_mca_cpu, init_stack));
+	BLANK();
+	DEFINE(IA64_SAL_OS_STATE_OS_GP_OFFSET,
+	       offsetof (struct ia64_sal_os_state, os_gp));
+	DEFINE(IA64_SAL_OS_STATE_PROC_STATE_PARAM_OFFSET,
+	       offsetof (struct ia64_sal_os_state, proc_state_param));
+	DEFINE(IA64_SAL_OS_STATE_SAL_RA_OFFSET,
+	       offsetof (struct ia64_sal_os_state, sal_ra));
+	DEFINE(IA64_SAL_OS_STATE_SAL_GP_OFFSET,
+	       offsetof (struct ia64_sal_os_state, sal_gp));
+	DEFINE(IA64_SAL_OS_STATE_PAL_MIN_STATE_OFFSET,
+	       offsetof (struct ia64_sal_os_state, pal_min_state));
+	DEFINE(IA64_SAL_OS_STATE_OS_STATUS_OFFSET,
+	       offsetof (struct ia64_sal_os_state, os_status));
+	DEFINE(IA64_SAL_OS_STATE_CONTEXT_OFFSET,
+	       offsetof (struct ia64_sal_os_state, context));
+	DEFINE(IA64_SAL_OS_STATE_SIZE,
+	       sizeof (struct ia64_sal_os_state));
+	BLANK();
+
+	DEFINE(IA64_PMSA_GR_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_gr));
+	DEFINE(IA64_PMSA_BANK1_GR_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_bank1_gr));
+	DEFINE(IA64_PMSA_PR_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_pr));
+	DEFINE(IA64_PMSA_BR0_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_br0));
+	DEFINE(IA64_PMSA_RSC_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_rsc));
+	DEFINE(IA64_PMSA_IIP_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_iip));
+	DEFINE(IA64_PMSA_IPSR_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_ipsr));
+	DEFINE(IA64_PMSA_IFS_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_ifs));
+	DEFINE(IA64_PMSA_XIP_OFFSET,
+	       offsetof(struct pal_min_state_area, pmsa_xip));
+	BLANK();
+
+	/* used by fsys_gettimeofday in arch/ia64/kernel/fsys.S */
+	DEFINE(IA64_GTOD_SEQ_OFFSET,
+	       offsetof (struct fsyscall_gtod_data_t, seq));
+	DEFINE(IA64_GTOD_WALL_TIME_OFFSET,
+		offsetof (struct fsyscall_gtod_data_t, wall_time));
+	DEFINE(IA64_GTOD_MONO_TIME_OFFSET,
+		offsetof (struct fsyscall_gtod_data_t, monotonic_time));
+	DEFINE(IA64_CLKSRC_MASK_OFFSET,
+		offsetof (struct fsyscall_gtod_data_t, clk_mask));
+	DEFINE(IA64_CLKSRC_MULT_OFFSET,
+		offsetof (struct fsyscall_gtod_data_t, clk_mult));
+	DEFINE(IA64_CLKSRC_SHIFT_OFFSET,
+		offsetof (struct fsyscall_gtod_data_t, clk_shift));
+	DEFINE(IA64_CLKSRC_MMIO_OFFSET,
+		offsetof (struct fsyscall_gtod_data_t, clk_fsys_mmio));
+	DEFINE(IA64_CLKSRC_CYCLE_LAST_OFFSET,
+		offsetof (struct fsyscall_gtod_data_t, clk_cycle_last));
+	DEFINE(IA64_ITC_JITTER_OFFSET,
+		offsetof (struct itc_jitter_data_t, itc_jitter));
+	DEFINE(IA64_ITC_LASTCYCLE_OFFSET,
+		offsetof (struct itc_jitter_data_t, itc_lastcycle));
+
+}
diff --git a/arch/ia64/kernel/audit.c b/arch/ia64/kernel/audit.c
new file mode 100644
index 000000000..ec61f20ca
--- /dev/null
+++ b/arch/ia64/kernel/audit.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/audit.h>
+#include <asm/unistd.h>
+
+static unsigned dir_class[] = {
+#include <asm-generic/audit_dir_write.h>
+~0U
+};
+
+static unsigned read_class[] = {
+#include <asm-generic/audit_read.h>
+~0U
+};
+
+static unsigned write_class[] = {
+#include <asm-generic/audit_write.h>
+~0U
+};
+
+static unsigned chattr_class[] = {
+#include <asm-generic/audit_change_attr.h>
+~0U
+};
+
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
+int audit_classify_arch(int arch)
+{
+	return 0;
+}
+
+int audit_classify_syscall(int abi, unsigned syscall)
+{
+	switch(syscall) {
+	case __NR_open:
+		return AUDITSC_OPEN;
+	case __NR_openat:
+		return AUDITSC_OPENAT;
+	case __NR_execve:
+		return AUDITSC_EXECVE;
+	case __NR_openat2:
+		return AUDITSC_OPENAT2;
+	default:
+		return AUDITSC_NATIVE;
+	}
+}
+
+static int __init audit_classes_init(void)
+{
+	audit_register_class(AUDIT_CLASS_WRITE, write_class);
+	audit_register_class(AUDIT_CLASS_READ, read_class);
+	audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class);
+	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
+	return 0;
+}
+
+__initcall(audit_classes_init);
diff --git a/arch/ia64/kernel/brl_emu.c b/arch/ia64/kernel/brl_emu.c
new file mode 100644
index 000000000..782c481d7
--- /dev/null
+++ b/arch/ia64/kernel/brl_emu.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Emulation of the "brl" instruction for IA64 processors that
+ *  don't support it in hardware.
+ *  Author: Stephan Zeisset, Intel Corp. <Stephan.Zeisset@intel.com>
+ *
+ *    02/22/02	D. Mosberger	Clear si_flgs, si_isr, and si_imm to avoid
+ *				leaking kernel bits.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/uaccess.h>
+#include <asm/processor.h>
+
+extern char ia64_set_b1, ia64_set_b2, ia64_set_b3, ia64_set_b4, ia64_set_b5;
+
+struct illegal_op_return {
+	unsigned long fkt, arg1, arg2, arg3;
+};
+
+/*
+ *  The unimplemented bits of a virtual address must be set
+ *  to the value of the most significant implemented bit.
+ *  unimpl_va_mask includes all unimplemented bits and
+ *  the most significant implemented bit, so the result
+ *  of an and operation with the mask must be all 0's
+ *  or all 1's for the address to be valid.
+ */
+#define unimplemented_virtual_address(va) (						\
+	((va) & local_cpu_data->unimpl_va_mask) != 0 &&					\
+	((va) & local_cpu_data->unimpl_va_mask) != local_cpu_data->unimpl_va_mask	\
+)
+
+/*
+ *  The unimplemented bits of a physical address must be 0.
+ *  unimpl_pa_mask includes all unimplemented bits, so the result
+ *  of an and operation with the mask must be all 0's for the
+ *  address to be valid.
+ */
+#define unimplemented_physical_address(pa) (		\
+	((pa) & local_cpu_data->unimpl_pa_mask) != 0	\
+)
+
+/*
+ *  Handle an illegal operation fault that was caused by an
+ *  unimplemented "brl" instruction.
+ *  If we are not successful (e.g because the illegal operation
+ *  wasn't caused by a "brl" after all), we return -1.
+ *  If we are successful, we return either 0 or the address
+ *  of a "fixup" function for manipulating preserved register
+ *  state.
+ */
+
+struct illegal_op_return
+ia64_emulate_brl (struct pt_regs *regs, unsigned long ar_ec)
+{
+	unsigned long bundle[2];
+	unsigned long opcode, btype, qp, offset, cpl;
+	unsigned long next_ip;
+	struct illegal_op_return rv;
+	long tmp_taken, unimplemented_address;
+
+	rv.fkt = (unsigned long) -1;
+
+	/*
+	 *  Decode the instruction bundle.
+	 */
+
+	if (copy_from_user(bundle, (void *) (regs->cr_iip), sizeof(bundle)))
+		return rv;
+
+	next_ip = (unsigned long) regs->cr_iip + 16;
+
+	/* "brl" must be in slot 2. */
+	if (ia64_psr(regs)->ri != 1) return rv;
+
+	/* Must be "mlx" template */
+	if ((bundle[0] & 0x1e) != 0x4) return rv;
+
+	opcode = (bundle[1] >> 60);
+	btype = ((bundle[1] >> 29) & 0x7);
+	qp = ((bundle[1] >> 23) & 0x3f);
+	offset = ((bundle[1] & 0x0800000000000000L) << 4)
+		| ((bundle[1] & 0x00fffff000000000L) >> 32)
+		| ((bundle[1] & 0x00000000007fffffL) << 40)
+		| ((bundle[0] & 0xffff000000000000L) >> 24);
+
+	tmp_taken = regs->pr & (1L << qp);
+
+	switch(opcode) {
+
+		case 0xC:
+			/*
+			 *  Long Branch.
+			 */
+			if (btype != 0) return rv;
+			rv.fkt = 0;
+			if (!(tmp_taken)) {
+				/*
+				 *  Qualifying predicate is 0.
+				 *  Skip instruction.
+				 */
+				regs->cr_iip = next_ip;
+				ia64_psr(regs)->ri = 0;
+				return rv;
+			}
+			break;
+
+		case 0xD:
+			/*
+			 *  Long Call.
+			 */
+			rv.fkt = 0;
+			if (!(tmp_taken)) {
+				/*
+				 *  Qualifying predicate is 0.
+				 *  Skip instruction.
+				 */
+				regs->cr_iip = next_ip;
+				ia64_psr(regs)->ri = 0;
+				return rv;
+			}
+
+			/*
+			 *  BR[btype] = IP+16
+			 */
+			switch(btype) {
+				case 0:
+					regs->b0 = next_ip;
+					break;
+				case 1:
+					rv.fkt = (unsigned long) &ia64_set_b1;
+					break;
+				case 2:
+					rv.fkt = (unsigned long) &ia64_set_b2;
+					break;
+				case 3:
+					rv.fkt = (unsigned long) &ia64_set_b3;
+					break;
+				case 4:
+					rv.fkt = (unsigned long) &ia64_set_b4;
+					break;
+				case 5:
+					rv.fkt = (unsigned long) &ia64_set_b5;
+					break;
+				case 6:
+					regs->b6 = next_ip;
+					break;
+				case 7:
+					regs->b7 = next_ip;
+					break;
+			}
+			rv.arg1 = next_ip;
+
+			/*
+			 *  AR[PFS].pfm = CFM
+			 *  AR[PFS].pec = AR[EC]
+			 *  AR[PFS].ppl = PSR.cpl
+			 */
+			cpl = ia64_psr(regs)->cpl;
+			regs->ar_pfs = ((regs->cr_ifs & 0x3fffffffff)
+					| (ar_ec << 52) | (cpl << 62));
+
+			/*
+			 *  CFM.sof -= CFM.sol
+			 *  CFM.sol = 0
+			 *  CFM.sor = 0
+			 *  CFM.rrb.gr = 0
+			 *  CFM.rrb.fr = 0
+			 *  CFM.rrb.pr = 0
+			 */
+			regs->cr_ifs = ((regs->cr_ifs & 0xffffffc00000007f)
+					- ((regs->cr_ifs >> 7) & 0x7f));
+
+			break;
+
+		default:
+			/*
+			 *  Unknown opcode.
+			 */
+			return rv;
+
+	}
+
+	regs->cr_iip += offset;
+	ia64_psr(regs)->ri = 0;
+
+	if (ia64_psr(regs)->it == 0)
+		unimplemented_address = unimplemented_physical_address(regs->cr_iip);
+	else
+		unimplemented_address = unimplemented_virtual_address(regs->cr_iip);
+
+	if (unimplemented_address) {
+		/*
+		 *  The target address contains unimplemented bits.
+		 */
+		printk(KERN_DEBUG "Woah! Unimplemented Instruction Address Trap!\n");
+		force_sig_fault(SIGILL, ILL_BADIADDR, (void __user *)NULL,
+				0, 0, 0);
+	} else if (ia64_psr(regs)->tb) {
+		/*
+		 *  Branch Tracing is enabled.
+		 *  Force a taken branch signal.
+		 */
+		force_sig_fault(SIGTRAP, TRAP_BRANCH, (void __user *)NULL,
+				0, 0, 0);
+	} else if (ia64_psr(regs)->ss) {
+		/*
+		 *  Single Step is enabled.
+		 *  Force a trace signal.
+		 */
+		force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)NULL,
+				0, 0, 0);
+	}
+	return rv;
+}
diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
new file mode 100644
index 000000000..76730f346
--- /dev/null
+++ b/arch/ia64/kernel/crash.c
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/ia64/kernel/crash.c
+ *
+ * Architecture specific (ia64) functions for kexec based crash dumps.
+ *
+ * Created by: Khalid Aziz <khalid.aziz@hp.com>
+ * Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
+ * Copyright (C) 2005 Intel Corp	Zou Nan hai <nanhai.zou@intel.com>
+ *
+ */
+#include <linux/smp.h>
+#include <linux/delay.h>
+#include <linux/crash_dump.h>
+#include <linux/memblock.h>
+#include <linux/kexec.h>
+#include <linux/elfcore.h>
+#include <linux/reboot.h>
+#include <linux/sysctl.h>
+#include <linux/init.h>
+#include <linux/kdebug.h>
+
+#include <asm/mca.h>
+
+int kdump_status[NR_CPUS];
+static atomic_t kdump_cpu_frozen;
+atomic_t kdump_in_progress;
+static int kdump_freeze_monarch;
+static int kdump_on_init = 1;
+static int kdump_on_fatal_mca = 1;
+
+extern void ia64_dump_cpu_regs(void *);
+
+static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
+
+void
+crash_save_this_cpu(void)
+{
+	void *buf;
+	unsigned long cfm, sof, sol;
+
+	int cpu = smp_processor_id();
+	struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu);
+
+	elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg);
+	memset(prstatus, 0, sizeof(*prstatus));
+	prstatus->common.pr_pid = current->pid;
+
+	ia64_dump_cpu_regs(dst);
+	cfm = dst[43];
+	sol = (cfm >> 7) & 0x7f;
+	sof = cfm & 0x7f;
+	dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
+			sof - sol);
+
+	buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
+	if (!buf)
+		return;
+	buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, prstatus,
+			sizeof(*prstatus));
+	final_note(buf);
+}
+
+#ifdef CONFIG_SMP
+static int
+kdump_wait_cpu_freeze(void)
+{
+	int cpu_num = num_online_cpus() - 1;
+	int timeout = 1000;
+	while(timeout-- > 0) {
+		if (atomic_read(&kdump_cpu_frozen) == cpu_num)
+			return 0;
+		udelay(1000);
+	}
+	return 1;
+}
+#endif
+
+void
+machine_crash_shutdown(struct pt_regs *pt)
+{
+	/* This function is only called after the system
+	 * has paniced or is otherwise in a critical state.
+	 * The minimum amount of code to allow a kexec'd kernel
+	 * to run successfully needs to happen here.
+	 *
+	 * In practice this means shooting down the other cpus in
+	 * an SMP system.
+	 */
+	kexec_disable_iosapic();
+#ifdef CONFIG_SMP
+	/*
+	 * If kdump_on_init is set and an INIT is asserted here, kdump will
+	 * be started again via INIT monarch.
+	 */
+	local_irq_disable();
+	ia64_set_psr_mc();	/* mask MCA/INIT */
+	if (atomic_inc_return(&kdump_in_progress) != 1)
+		unw_init_running(kdump_cpu_freeze, NULL);
+
+	/*
+	 * Now this cpu is ready for kdump.
+	 * Stop all others by IPI or INIT.  They could receive INIT from
+	 * outside and might be INIT monarch, but only thing they have to
+	 * do is falling into kdump_cpu_freeze().
+	 *
+	 * If an INIT is asserted here:
+	 * - All receivers might be slaves, since some of cpus could already
+	 *   be frozen and INIT might be masked on monarch.  In this case,
+	 *   all slaves will be frozen soon since kdump_in_progress will let
+	 *   them into DIE_INIT_SLAVE_LEAVE.
+	 * - One might be a monarch, but INIT rendezvous will fail since
+	 *   at least this cpu already have INIT masked so it never join
+	 *   to the rendezvous.  In this case, all slaves and monarch will
+	 *   be frozen soon with no wait since the INIT rendezvous is skipped
+	 *   by kdump_in_progress.
+	 */
+	kdump_smp_send_stop();
+	/* not all cpu response to IPI, send INIT to freeze them */
+	if (kdump_wait_cpu_freeze()) {
+		kdump_smp_send_init();
+		/* wait again, don't go ahead if possible */
+		kdump_wait_cpu_freeze();
+	}
+#endif
+}
+
+static void
+machine_kdump_on_init(void)
+{
+	crash_save_vmcoreinfo();
+	local_irq_disable();
+	kexec_disable_iosapic();
+	machine_kexec(ia64_kimage);
+}
+
+void
+kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
+{
+	int cpuid;
+
+	local_irq_disable();
+	cpuid = smp_processor_id();
+	crash_save_this_cpu();
+	current->thread.ksp = (__u64)info->sw - 16;
+
+	ia64_set_psr_mc();	/* mask MCA/INIT and stop reentrance */
+
+	atomic_inc(&kdump_cpu_frozen);
+	kdump_status[cpuid] = 1;
+	mb();
+	for (;;)
+		cpu_relax();
+}
+
+static int
+kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
+{
+	struct ia64_mca_notify_die *nd;
+	struct die_args *args = data;
+
+	if (atomic_read(&kdump_in_progress)) {
+		switch (val) {
+		case DIE_INIT_MONARCH_LEAVE:
+			if (!kdump_freeze_monarch)
+				break;
+			fallthrough;
+		case DIE_INIT_SLAVE_LEAVE:
+		case DIE_INIT_MONARCH_ENTER:
+		case DIE_MCA_RENDZVOUS_LEAVE:
+			unw_init_running(kdump_cpu_freeze, NULL);
+			break;
+		}
+	}
+
+	if (!kdump_on_init && !kdump_on_fatal_mca)
+		return NOTIFY_DONE;
+
+	if (!ia64_kimage) {
+		if (val == DIE_INIT_MONARCH_LEAVE)
+			ia64_mca_printk(KERN_NOTICE
+					"%s: kdump not configured\n",
+					__func__);
+		return NOTIFY_DONE;
+	}
+
+	if (val != DIE_INIT_MONARCH_LEAVE &&
+	    val != DIE_INIT_MONARCH_PROCESS &&
+	    val != DIE_MCA_MONARCH_LEAVE)
+		return NOTIFY_DONE;
+
+	nd = (struct ia64_mca_notify_die *)args->err;
+
+	switch (val) {
+	case DIE_INIT_MONARCH_PROCESS:
+		/* Reason code 1 means machine check rendezvous*/
+		if (kdump_on_init && (nd->sos->rv_rc != 1)) {
+			if (atomic_inc_return(&kdump_in_progress) != 1)
+				kdump_freeze_monarch = 1;
+		}
+		break;
+	case DIE_INIT_MONARCH_LEAVE:
+		/* Reason code 1 means machine check rendezvous*/
+		if (kdump_on_init && (nd->sos->rv_rc != 1))
+			machine_kdump_on_init();
+		break;
+	case DIE_MCA_MONARCH_LEAVE:
+		/* *(nd->data) indicate if MCA is recoverable */
+		if (kdump_on_fatal_mca && !(*(nd->data))) {
+			if (atomic_inc_return(&kdump_in_progress) == 1)
+				machine_kdump_on_init();
+			/* We got fatal MCA while kdump!? No way!! */
+		}
+		break;
+	}
+	return NOTIFY_DONE;
+}
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table kdump_ctl_table[] = {
+	{
+		.procname = "kdump_on_init",
+		.data = &kdump_on_init,
+		.maxlen = sizeof(int),
+		.mode = 0644,
+		.proc_handler = proc_dointvec,
+	},
+	{
+		.procname = "kdump_on_fatal_mca",
+		.data = &kdump_on_fatal_mca,
+		.maxlen = sizeof(int),
+		.mode = 0644,
+		.proc_handler = proc_dointvec,
+	},
+	{ }
+};
+
+static struct ctl_table sys_table[] = {
+	{
+	  .procname = "kernel",
+	  .mode = 0555,
+	  .child = kdump_ctl_table,
+	},
+	{ }
+};
+#endif
+
+static int
+machine_crash_setup(void)
+{
+	/* be notified before default_monarch_init_process */
+	static struct notifier_block kdump_init_notifier_nb = {
+		.notifier_call = kdump_init_notifier,
+		.priority = 1,
+	};
+	int ret;
+	if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
+		return ret;
+#ifdef CONFIG_SYSCTL
+	register_sysctl_table(sys_table);
+#endif
+	return 0;
+}
+
+__initcall(machine_crash_setup);
+
diff --git a/arch/ia64/kernel/crash_dump.c b/arch/ia64/kernel/crash_dump.c
new file mode 100644
index 000000000..4ef68e2aa
--- /dev/null
+++ b/arch/ia64/kernel/crash_dump.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	kernel/crash_dump.c - Memory preserving reboot related code.
+ *
+ *	Created by: Simon Horman <horms@verge.net.au>
+ *	Original code moved from kernel/crash.c
+ *	Original code comment copied from the i386 version of this file
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/crash_dump.h>
+#include <linux/uio.h>
+#include <asm/page.h>
+
+ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
+		size_t csize, unsigned long offset)
+{
+	void  *vaddr;
+
+	if (!csize)
+		return 0;
+	vaddr = __va(pfn<<PAGE_SHIFT);
+	csize = copy_to_iter(vaddr + offset, csize, iter);
+	return csize;
+}
+
diff --git a/arch/ia64/kernel/cyclone.c b/arch/ia64/kernel/cyclone.c
new file mode 100644
index 000000000..258d7b70c
--- /dev/null
+++ b/arch/ia64/kernel/cyclone.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/module.h>
+#include <linux/smp.h>
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <linux/timex.h>
+#include <linux/clocksource.h>
+#include <linux/io.h>
+
+/* IBM Summit (EXA) Cyclone counter code*/
+#define CYCLONE_CBAR_ADDR 0xFEB00CD0
+#define CYCLONE_PMCC_OFFSET 0x51A0
+#define CYCLONE_MPMC_OFFSET 0x51D0
+#define CYCLONE_MPCS_OFFSET 0x51A8
+#define CYCLONE_TIMER_FREQ 100000000
+
+int use_cyclone;
+void __init cyclone_setup(void)
+{
+	use_cyclone = 1;
+}
+
+static void __iomem *cyclone_mc;
+
+static u64 read_cyclone(struct clocksource *cs)
+{
+	return (u64)readq((void __iomem *)cyclone_mc);
+}
+
+static struct clocksource clocksource_cyclone = {
+        .name           = "cyclone",
+        .rating         = 300,
+        .read           = read_cyclone,
+        .mask           = (1LL << 40) - 1,
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+int __init init_cyclone_clock(void)
+{
+	u64 __iomem *reg;
+	u64 base;	/* saved cyclone base address */
+	u64 offset;	/* offset from pageaddr to cyclone_timer register */
+	int i;
+	u32 __iomem *cyclone_timer;	/* Cyclone MPMC0 register */
+
+	if (!use_cyclone)
+		return 0;
+
+	printk(KERN_INFO "Summit chipset: Starting Cyclone Counter.\n");
+
+	/* find base address */
+	offset = (CYCLONE_CBAR_ADDR);
+	reg = ioremap(offset, sizeof(u64));
+	if(!reg){
+		printk(KERN_ERR "Summit chipset: Could not find valid CBAR"
+				" register.\n");
+		use_cyclone = 0;
+		return -ENODEV;
+	}
+	base = readq(reg);
+	iounmap(reg);
+	if(!base){
+		printk(KERN_ERR "Summit chipset: Could not find valid CBAR"
+				" value.\n");
+		use_cyclone = 0;
+		return -ENODEV;
+	}
+
+	/* setup PMCC */
+	offset = (base + CYCLONE_PMCC_OFFSET);
+	reg = ioremap(offset, sizeof(u64));
+	if(!reg){
+		printk(KERN_ERR "Summit chipset: Could not find valid PMCC"
+				" register.\n");
+		use_cyclone = 0;
+		return -ENODEV;
+	}
+	writel(0x00000001,reg);
+	iounmap(reg);
+
+	/* setup MPCS */
+	offset = (base + CYCLONE_MPCS_OFFSET);
+	reg = ioremap(offset, sizeof(u64));
+	if(!reg){
+		printk(KERN_ERR "Summit chipset: Could not find valid MPCS"
+				" register.\n");
+		use_cyclone = 0;
+		return -ENODEV;
+	}
+	writel(0x00000001,reg);
+	iounmap(reg);
+
+	/* map in cyclone_timer */
+	offset = (base + CYCLONE_MPMC_OFFSET);
+	cyclone_timer = ioremap(offset, sizeof(u32));
+	if(!cyclone_timer){
+		printk(KERN_ERR "Summit chipset: Could not find valid MPMC"
+				" register.\n");
+		use_cyclone = 0;
+		return -ENODEV;
+	}
+
+	/*quick test to make sure its ticking*/
+	for(i=0; i<3; i++){
+		u32 old = readl(cyclone_timer);
+		int stall = 100;
+		while(stall--) barrier();
+		if(readl(cyclone_timer) == old){
+			printk(KERN_ERR "Summit chipset: Counter not counting!"
+					" DISABLED\n");
+			iounmap(cyclone_timer);
+			cyclone_timer = NULL;
+			use_cyclone = 0;
+			return -ENODEV;
+		}
+	}
+	/* initialize last tick */
+	cyclone_mc = cyclone_timer;
+	clocksource_cyclone.archdata.fsys_mmio = cyclone_timer;
+	clocksource_register_hz(&clocksource_cyclone, CYCLONE_TIMER_FREQ);
+
+	return 0;
+}
+
+__initcall(init_cyclone_clock);
diff --git a/arch/ia64/kernel/dma-mapping.c b/arch/ia64/kernel/dma-mapping.c
new file mode 100644
index 000000000..cd0c166bf
--- /dev/null
+++ b/arch/ia64/kernel/dma-mapping.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/dma-map-ops.h>
+#include <linux/export.h>
+
+/* Set this to 1 if there is a HW IOMMU in the system */
+int iommu_detected __read_mostly;
+
+const struct dma_map_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
new file mode 100644
index 000000000..31149e41f
--- /dev/null
+++ b/arch/ia64/kernel/efi.c
@@ -0,0 +1,1360 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Extensible Firmware Interface
+ *
+ * Based on Extensible Firmware Interface Specification version 0.9
+ * April 30, 1999
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999-2003 Hewlett-Packard Co.
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
+ *	Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * All EFI Runtime Services are not implemented yet as EFI only
+ * supports physical mode addressing on SoftSDV. This is to be fixed
+ * in a future version.  --drummond 1999-07-20
+ *
+ * Implemented EFI runtime services and virtual mode calls.  --davidm
+ *
+ * Goutham Rao: <goutham.rao@intel.com>
+ *	Skip non-WB memory and ignore empty memory ranges.
+ */
+#include <linux/module.h>
+#include <linux/memblock.h>
+#include <linux/crash_dump.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/efi.h>
+#include <linux/kexec.h>
+#include <linux/mm.h>
+
+#include <asm/efi.h>
+#include <asm/io.h>
+#include <asm/kregs.h>
+#include <asm/meminit.h>
+#include <asm/processor.h>
+#include <asm/mca.h>
+#include <asm/sal.h>
+#include <asm/setup.h>
+#include <asm/tlbflush.h>
+
+#define EFI_DEBUG	0
+
+#define ESI_TABLE_GUID					\
+    EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3,		\
+	     0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)
+
+static unsigned long mps_phys = EFI_INVALID_TABLE_ADDR;
+static __initdata unsigned long palo_phys;
+
+unsigned long __initdata esi_phys = EFI_INVALID_TABLE_ADDR;
+unsigned long hcdp_phys = EFI_INVALID_TABLE_ADDR;
+unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;
+
+static const efi_config_table_type_t arch_tables[] __initconst = {
+	{ESI_TABLE_GUID,				&esi_phys,		"ESI"		},
+	{HCDP_TABLE_GUID,				&hcdp_phys,		"HCDP"		},
+	{MPS_TABLE_GUID,				&mps_phys,		"MPS"		},
+	{PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID,	&palo_phys,		"PALO"		},
+	{SAL_SYSTEM_TABLE_GUID,				&sal_systab_phys,	"SALsystab"	},
+	{},
+};
+
+extern efi_status_t efi_call_phys (void *, ...);
+
+static efi_runtime_services_t *runtime;
+static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
+
+#define efi_call_virt(f, args...)	(*(f))(args)
+
+#define STUB_GET_TIME(prefix, adjust_arg)				       \
+static efi_status_t							       \
+prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)			       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_time_cap_t *atc = NULL;					       \
+	efi_status_t ret;						       \
+									       \
+	if (tc)								       \
+		atc = adjust_arg(tc);					       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
+				adjust_arg(tm), atc);			       \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_SET_TIME(prefix, adjust_arg)				       \
+static efi_status_t							       \
+prefix##_set_time (efi_time_t *tm)					       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_status_t ret;						       \
+									       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
+				adjust_arg(tm));			       \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)			       \
+static efi_status_t							       \
+prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,	       \
+			  efi_time_t *tm)				       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_status_t ret;						       \
+									       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix(					       \
+		(efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
+		adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)			       \
+static efi_status_t							       \
+prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)		       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_time_t *atm = NULL;						       \
+	efi_status_t ret;						       \
+									       \
+	if (tm)								       \
+		atm = adjust_arg(tm);					       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix(					       \
+		(efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
+		enabled, atm);						       \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_GET_VARIABLE(prefix, adjust_arg)				       \
+static efi_status_t							       \
+prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
+		       unsigned long *data_size, void *data)		       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	u32 *aattr = NULL;						       \
+	efi_status_t ret;						       \
+									       \
+	if (attr)							       \
+		aattr = adjust_arg(attr);				       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix(					       \
+		(efi_get_variable_t *) __va(runtime->get_variable),	       \
+		adjust_arg(name), adjust_arg(vendor), aattr,		       \
+		adjust_arg(data_size), adjust_arg(data));		       \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)			       \
+static efi_status_t							       \
+prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
+			    efi_guid_t *vendor)				       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_status_t ret;						       \
+									       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix(					       \
+		(efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
+		adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_SET_VARIABLE(prefix, adjust_arg)				       \
+static efi_status_t							       \
+prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,		       \
+		       u32 attr, unsigned long data_size,		       \
+		       void *data)					       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_status_t ret;						       \
+									       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix(					       \
+		(efi_set_variable_t *) __va(runtime->set_variable),	       \
+		adjust_arg(name), adjust_arg(vendor), attr, data_size,	       \
+		adjust_arg(data));					       \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)		       \
+static efi_status_t							       \
+prefix##_get_next_high_mono_count (u32 *count)				       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_status_t ret;						       \
+									       \
+	ia64_save_scratch_fpregs(fr);					       \
+	ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)	       \
+				__va(runtime->get_next_high_mono_count),       \
+				adjust_arg(count));			       \
+	ia64_load_scratch_fpregs(fr);					       \
+	return ret;							       \
+}
+
+#define STUB_RESET_SYSTEM(prefix, adjust_arg)				       \
+static void								       \
+prefix##_reset_system (int reset_type, efi_status_t status,		       \
+		       unsigned long data_size, efi_char16_t *data)	       \
+{									       \
+	struct ia64_fpreg fr[6];					       \
+	efi_char16_t *adata = NULL;					       \
+									       \
+	if (data)							       \
+		adata = adjust_arg(data);				       \
+									       \
+	ia64_save_scratch_fpregs(fr);					       \
+	efi_call_##prefix(						       \
+		(efi_reset_system_t *) __va(runtime->reset_system),	       \
+		reset_type, status, data_size, adata);			       \
+	/* should not return, but just in case... */			       \
+	ia64_load_scratch_fpregs(fr);					       \
+}
+
+#define phys_ptr(arg)	((__typeof__(arg)) ia64_tpa(arg))
+
+STUB_GET_TIME(phys, phys_ptr)
+STUB_SET_TIME(phys, phys_ptr)
+STUB_GET_WAKEUP_TIME(phys, phys_ptr)
+STUB_SET_WAKEUP_TIME(phys, phys_ptr)
+STUB_GET_VARIABLE(phys, phys_ptr)
+STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
+STUB_SET_VARIABLE(phys, phys_ptr)
+STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
+STUB_RESET_SYSTEM(phys, phys_ptr)
+
+#define id(arg)	arg
+
+STUB_GET_TIME(virt, id)
+STUB_SET_TIME(virt, id)
+STUB_GET_WAKEUP_TIME(virt, id)
+STUB_SET_WAKEUP_TIME(virt, id)
+STUB_GET_VARIABLE(virt, id)
+STUB_GET_NEXT_VARIABLE(virt, id)
+STUB_SET_VARIABLE(virt, id)
+STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
+STUB_RESET_SYSTEM(virt, id)
+
+void
+efi_gettimeofday (struct timespec64 *ts)
+{
+	efi_time_t tm;
+
+	if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
+		memset(ts, 0, sizeof(*ts));
+		return;
+	}
+
+	ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
+			    tm.hour, tm.minute, tm.second);
+	ts->tv_nsec = tm.nanosecond;
+}
+
+static int
+is_memory_available (efi_memory_desc_t *md)
+{
+	if (!(md->attribute & EFI_MEMORY_WB))
+		return 0;
+
+	switch (md->type) {
+	      case EFI_LOADER_CODE:
+	      case EFI_LOADER_DATA:
+	      case EFI_BOOT_SERVICES_CODE:
+	      case EFI_BOOT_SERVICES_DATA:
+	      case EFI_CONVENTIONAL_MEMORY:
+		return 1;
+	}
+	return 0;
+}
+
+typedef struct kern_memdesc {
+	u64 attribute;
+	u64 start;
+	u64 num_pages;
+} kern_memdesc_t;
+
+static kern_memdesc_t *kern_memmap;
+
+#define efi_md_size(md)	(md->num_pages << EFI_PAGE_SHIFT)
+
+static inline u64
+kmd_end(kern_memdesc_t *kmd)
+{
+	return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
+}
+
+static inline u64
+efi_md_end(efi_memory_desc_t *md)
+{
+	return (md->phys_addr + efi_md_size(md));
+}
+
+static inline int
+efi_wb(efi_memory_desc_t *md)
+{
+	return (md->attribute & EFI_MEMORY_WB);
+}
+
+static inline int
+efi_uc(efi_memory_desc_t *md)
+{
+	return (md->attribute & EFI_MEMORY_UC);
+}
+
+static void
+walk (efi_freemem_callback_t callback, void *arg, u64 attr)
+{
+	kern_memdesc_t *k;
+	u64 start, end, voff;
+
+	voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
+	for (k = kern_memmap; k->start != ~0UL; k++) {
+		if (k->attribute != attr)
+			continue;
+		start = PAGE_ALIGN(k->start);
+		end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
+		if (start < end)
+			if ((*callback)(start + voff, end + voff, arg) < 0)
+				return;
+	}
+}
+
+/*
+ * Walk the EFI memory map and call CALLBACK once for each EFI memory
+ * descriptor that has memory that is available for OS use.
+ */
+void
+efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
+{
+	walk(callback, arg, EFI_MEMORY_WB);
+}
+
+/*
+ * Walk the EFI memory map and call CALLBACK once for each EFI memory
+ * descriptor that has memory that is available for uncached allocator.
+ */
+void
+efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
+{
+	walk(callback, arg, EFI_MEMORY_UC);
+}
+
+/*
+ * Look for the PAL_CODE region reported by EFI and map it using an
+ * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
+ * Abstraction Layer chapter 11 in ADAG
+ */
+void *
+efi_get_pal_addr (void)
+{
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	u64 efi_desc_size;
+	int pal_code_count = 0;
+	u64 vaddr, mask;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+		if (md->type != EFI_PAL_CODE)
+			continue;
+
+		if (++pal_code_count > 1) {
+			printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
+			       "dropped @ %llx\n", md->phys_addr);
+			continue;
+		}
+		/*
+		 * The only ITLB entry in region 7 that is used is the one
+		 * installed by __start().  That entry covers a 64MB range.
+		 */
+		mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
+		vaddr = PAGE_OFFSET + md->phys_addr;
+
+		/*
+		 * We must check that the PAL mapping won't overlap with the
+		 * kernel mapping.
+		 *
+		 * PAL code is guaranteed to be aligned on a power of 2 between
+		 * 4k and 256KB and that only one ITR is needed to map it. This
+		 * implies that the PAL code is always aligned on its size,
+		 * i.e., the closest matching page size supported by the TLB.
+		 * Therefore PAL code is guaranteed never to cross a 64MB unless
+		 * it is bigger than 64MB (very unlikely!).  So for now the
+		 * following test is enough to determine whether or not we need
+		 * a dedicated ITR for the PAL code.
+		 */
+		if ((vaddr & mask) == (KERNEL_START & mask)) {
+			printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
+			       __func__);
+			continue;
+		}
+
+		if (efi_md_size(md) > IA64_GRANULE_SIZE)
+			panic("Whoa!  PAL code size bigger than a granule!");
+
+#if EFI_DEBUG
+		mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
+
+		printk(KERN_INFO "CPU %d: mapping PAL code "
+			"[0x%llx-0x%llx) into [0x%llx-0x%llx)\n",
+			smp_processor_id(), md->phys_addr,
+			md->phys_addr + efi_md_size(md),
+			vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
+#endif
+		return __va(md->phys_addr);
+	}
+	printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
+	       __func__);
+	return NULL;
+}
+
+
+static u8 __init palo_checksum(u8 *buffer, u32 length)
+{
+	u8 sum = 0;
+	u8 *end = buffer + length;
+
+	while (buffer < end)
+		sum = (u8) (sum + *(buffer++));
+
+	return sum;
+}
+
+/*
+ * Parse and handle PALO table which is published at:
+ * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
+ */
+static void __init handle_palo(unsigned long phys_addr)
+{
+	struct palo_table *palo = __va(phys_addr);
+	u8  checksum;
+
+	if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
+		printk(KERN_INFO "PALO signature incorrect.\n");
+		return;
+	}
+
+	checksum = palo_checksum((u8 *)palo, palo->length);
+	if (checksum) {
+		printk(KERN_INFO "PALO checksum incorrect.\n");
+		return;
+	}
+
+	setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
+}
+
+void
+efi_map_pal_code (void)
+{
+	void *pal_vaddr = efi_get_pal_addr ();
+	u64 psr;
+
+	if (!pal_vaddr)
+		return;
+
+	/*
+	 * Cannot write to CRx with PSR.ic=1
+	 */
+	psr = ia64_clear_ic();
+	ia64_itr(0x1, IA64_TR_PALCODE,
+		 GRANULEROUNDDOWN((unsigned long) pal_vaddr),
+		 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
+		 IA64_GRANULE_SHIFT);
+	ia64_set_psr(psr);		/* restore psr */
+}
+
+void __init
+efi_init (void)
+{
+	const efi_system_table_t *efi_systab;
+	void *efi_map_start, *efi_map_end;
+	u64 efi_desc_size;
+	char *cp;
+
+	set_bit(EFI_BOOT, &efi.flags);
+	set_bit(EFI_64BIT, &efi.flags);
+
+	/*
+	 * It's too early to be able to use the standard kernel command line
+	 * support...
+	 */
+	for (cp = boot_command_line; *cp; ) {
+		if (memcmp(cp, "mem=", 4) == 0) {
+			mem_limit = memparse(cp + 4, &cp);
+		} else if (memcmp(cp, "max_addr=", 9) == 0) {
+			max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
+		} else if (memcmp(cp, "min_addr=", 9) == 0) {
+			min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
+		} else {
+			while (*cp != ' ' && *cp)
+				++cp;
+			while (*cp == ' ')
+				++cp;
+		}
+	}
+	if (min_addr != 0UL)
+		printk(KERN_INFO "Ignoring memory below %lluMB\n",
+		       min_addr >> 20);
+	if (max_addr != ~0UL)
+		printk(KERN_INFO "Ignoring memory above %lluMB\n",
+		       max_addr >> 20);
+
+	efi_systab = __va(ia64_boot_param->efi_systab);
+
+	/*
+	 * Verify the EFI Table
+	 */
+	if (efi_systab == NULL)
+		panic("Whoa! Can't find EFI system table.\n");
+	if (efi_systab_check_header(&efi_systab->hdr, 1))
+		panic("Whoa! EFI system table signature incorrect\n");
+
+	efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
+
+	palo_phys      = EFI_INVALID_TABLE_ADDR;
+
+	if (efi_config_parse_tables(__va(efi_systab->tables),
+				    efi_systab->nr_tables,
+				    arch_tables) != 0)
+		return;
+
+	if (palo_phys != EFI_INVALID_TABLE_ADDR)
+		handle_palo(palo_phys);
+
+	runtime = __va(efi_systab->runtime);
+	efi.get_time = phys_get_time;
+	efi.set_time = phys_set_time;
+	efi.get_wakeup_time = phys_get_wakeup_time;
+	efi.set_wakeup_time = phys_set_wakeup_time;
+	efi.get_variable = phys_get_variable;
+	efi.get_next_variable = phys_get_next_variable;
+	efi.set_variable = phys_set_variable;
+	efi.get_next_high_mono_count = phys_get_next_high_mono_count;
+	efi.reset_system = phys_reset_system;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+#if EFI_DEBUG
+	/* print EFI memory map: */
+	{
+		efi_memory_desc_t *md;
+		void *p;
+		unsigned int i;
+
+		for (i = 0, p = efi_map_start; p < efi_map_end;
+		     ++i, p += efi_desc_size)
+		{
+			const char *unit;
+			unsigned long size;
+			char buf[64];
+
+			md = p;
+			size = md->num_pages << EFI_PAGE_SHIFT;
+
+			if ((size >> 40) > 0) {
+				size >>= 40;
+				unit = "TB";
+			} else if ((size >> 30) > 0) {
+				size >>= 30;
+				unit = "GB";
+			} else if ((size >> 20) > 0) {
+				size >>= 20;
+				unit = "MB";
+			} else {
+				size >>= 10;
+				unit = "KB";
+			}
+
+			printk("mem%02d: %s "
+			       "range=[0x%016llx-0x%016llx) (%4lu%s)\n",
+			       i, efi_md_typeattr_format(buf, sizeof(buf), md),
+			       md->phys_addr,
+			       md->phys_addr + efi_md_size(md), size, unit);
+		}
+	}
+#endif
+
+	efi_map_pal_code();
+	efi_enter_virtual_mode();
+}
+
+void
+efi_enter_virtual_mode (void)
+{
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	efi_status_t status;
+	u64 efi_desc_size;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+		if (md->attribute & EFI_MEMORY_RUNTIME) {
+			/*
+			 * Some descriptors have multiple bits set, so the
+			 * order of the tests is relevant.
+			 */
+			if (md->attribute & EFI_MEMORY_WB) {
+				md->virt_addr = (u64) __va(md->phys_addr);
+			} else if (md->attribute & EFI_MEMORY_UC) {
+				md->virt_addr = (u64) ioremap(md->phys_addr, 0);
+			} else if (md->attribute & EFI_MEMORY_WC) {
+#if 0
+				md->virt_addr = ia64_remap(md->phys_addr,
+							   (_PAGE_A |
+							    _PAGE_P |
+							    _PAGE_D |
+							    _PAGE_MA_WC |
+							    _PAGE_PL_0 |
+							    _PAGE_AR_RW));
+#else
+				printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
+				md->virt_addr = (u64) ioremap(md->phys_addr, 0);
+#endif
+			} else if (md->attribute & EFI_MEMORY_WT) {
+#if 0
+				md->virt_addr = ia64_remap(md->phys_addr,
+							   (_PAGE_A |
+							    _PAGE_P |
+							    _PAGE_D |
+							    _PAGE_MA_WT |
+							    _PAGE_PL_0 |
+							    _PAGE_AR_RW));
+#else
+				printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
+				md->virt_addr = (u64) ioremap(md->phys_addr, 0);
+#endif
+			}
+		}
+	}
+
+	status = efi_call_phys(__va(runtime->set_virtual_address_map),
+			       ia64_boot_param->efi_memmap_size,
+			       efi_desc_size,
+			       ia64_boot_param->efi_memdesc_version,
+			       ia64_boot_param->efi_memmap);
+	if (status != EFI_SUCCESS) {
+		printk(KERN_WARNING "warning: unable to switch EFI into "
+		       "virtual mode (status=%lu)\n", status);
+		return;
+	}
+
+	set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+
+	/*
+	 * Now that EFI is in virtual mode, we call the EFI functions more
+	 * efficiently:
+	 */
+	efi.get_time = virt_get_time;
+	efi.set_time = virt_set_time;
+	efi.get_wakeup_time = virt_get_wakeup_time;
+	efi.set_wakeup_time = virt_set_wakeup_time;
+	efi.get_variable = virt_get_variable;
+	efi.get_next_variable = virt_get_next_variable;
+	efi.set_variable = virt_set_variable;
+	efi.get_next_high_mono_count = virt_get_next_high_mono_count;
+	efi.reset_system = virt_reset_system;
+}
+
+/*
+ * Walk the EFI memory map looking for the I/O port range.  There can only be
+ * one entry of this type, other I/O port ranges should be described via ACPI.
+ */
+u64
+efi_get_iobase (void)
+{
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	u64 efi_desc_size;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+		if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
+			if (md->attribute & EFI_MEMORY_UC)
+				return md->phys_addr;
+		}
+	}
+	return 0;
+}
+
+static struct kern_memdesc *
+kern_memory_descriptor (unsigned long phys_addr)
+{
+	struct kern_memdesc *md;
+
+	for (md = kern_memmap; md->start != ~0UL; md++) {
+		if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
+			 return md;
+	}
+	return NULL;
+}
+
+static efi_memory_desc_t *
+efi_memory_descriptor (unsigned long phys_addr)
+{
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	u64 efi_desc_size;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+
+		if (phys_addr - md->phys_addr < efi_md_size(md))
+			 return md;
+	}
+	return NULL;
+}
+
+static int
+efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
+{
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	u64 efi_desc_size;
+	unsigned long end;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	end = phys_addr + size;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+		if (md->phys_addr < end && efi_md_end(md) > phys_addr)
+			return 1;
+	}
+	return 0;
+}
+
+int
+efi_mem_type (unsigned long phys_addr)
+{
+	efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+
+	if (md)
+		return md->type;
+	return -EINVAL;
+}
+
+u64
+efi_mem_attributes (unsigned long phys_addr)
+{
+	efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+
+	if (md)
+		return md->attribute;
+	return 0;
+}
+EXPORT_SYMBOL(efi_mem_attributes);
+
+u64
+efi_mem_attribute (unsigned long phys_addr, unsigned long size)
+{
+	unsigned long end = phys_addr + size;
+	efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+	u64 attr;
+
+	if (!md)
+		return 0;
+
+	/*
+	 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
+	 * the kernel that firmware needs this region mapped.
+	 */
+	attr = md->attribute & ~EFI_MEMORY_RUNTIME;
+	do {
+		unsigned long md_end = efi_md_end(md);
+
+		if (end <= md_end)
+			return attr;
+
+		md = efi_memory_descriptor(md_end);
+		if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
+			return 0;
+	} while (md);
+	return 0;	/* never reached */
+}
+
+u64
+kern_mem_attribute (unsigned long phys_addr, unsigned long size)
+{
+	unsigned long end = phys_addr + size;
+	struct kern_memdesc *md;
+	u64 attr;
+
+	/*
+	 * This is a hack for ioremap calls before we set up kern_memmap.
+	 * Maybe we should do efi_memmap_init() earlier instead.
+	 */
+	if (!kern_memmap) {
+		attr = efi_mem_attribute(phys_addr, size);
+		if (attr & EFI_MEMORY_WB)
+			return EFI_MEMORY_WB;
+		return 0;
+	}
+
+	md = kern_memory_descriptor(phys_addr);
+	if (!md)
+		return 0;
+
+	attr = md->attribute;
+	do {
+		unsigned long md_end = kmd_end(md);
+
+		if (end <= md_end)
+			return attr;
+
+		md = kern_memory_descriptor(md_end);
+		if (!md || md->attribute != attr)
+			return 0;
+	} while (md);
+	return 0;	/* never reached */
+}
+
+int
+valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
+{
+	u64 attr;
+
+	/*
+	 * /dev/mem reads and writes use copy_to_user(), which implicitly
+	 * uses a granule-sized kernel identity mapping.  It's really
+	 * only safe to do this for regions in kern_memmap.  For more
+	 * details, see Documentation/ia64/aliasing.rst.
+	 */
+	attr = kern_mem_attribute(phys_addr, size);
+	if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
+		return 1;
+	return 0;
+}
+
+int
+valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
+{
+	unsigned long phys_addr = pfn << PAGE_SHIFT;
+	u64 attr;
+
+	attr = efi_mem_attribute(phys_addr, size);
+
+	/*
+	 * /dev/mem mmap uses normal user pages, so we don't need the entire
+	 * granule, but the entire region we're mapping must support the same
+	 * attribute.
+	 */
+	if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
+		return 1;
+
+	/*
+	 * Intel firmware doesn't tell us about all the MMIO regions, so
+	 * in general we have to allow mmap requests.  But if EFI *does*
+	 * tell us about anything inside this region, we should deny it.
+	 * The user can always map a smaller region to avoid the overlap.
+	 */
+	if (efi_memmap_intersects(phys_addr, size))
+		return 0;
+
+	return 1;
+}
+
+pgprot_t
+phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
+		     pgprot_t vma_prot)
+{
+	unsigned long phys_addr = pfn << PAGE_SHIFT;
+	u64 attr;
+
+	/*
+	 * For /dev/mem mmap, we use user mappings, but if the region is
+	 * in kern_memmap (and hence may be covered by a kernel mapping),
+	 * we must use the same attribute as the kernel mapping.
+	 */
+	attr = kern_mem_attribute(phys_addr, size);
+	if (attr & EFI_MEMORY_WB)
+		return pgprot_cacheable(vma_prot);
+	else if (attr & EFI_MEMORY_UC)
+		return pgprot_noncached(vma_prot);
+
+	/*
+	 * Some chipsets don't support UC access to memory.  If
+	 * WB is supported, we prefer that.
+	 */
+	if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
+		return pgprot_cacheable(vma_prot);
+
+	return pgprot_noncached(vma_prot);
+}
+
+int __init
+efi_uart_console_only(void)
+{
+	efi_status_t status;
+	char *s, name[] = "ConOut";
+	efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
+	efi_char16_t *utf16, name_utf16[32];
+	unsigned char data[1024];
+	unsigned long size = sizeof(data);
+	struct efi_generic_dev_path *hdr, *end_addr;
+	int uart = 0;
+
+	/* Convert to UTF-16 */
+	utf16 = name_utf16;
+	s = name;
+	while (*s)
+		*utf16++ = *s++ & 0x7f;
+	*utf16 = 0;
+
+	status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
+	if (status != EFI_SUCCESS) {
+		printk(KERN_ERR "No EFI %s variable?\n", name);
+		return 0;
+	}
+
+	hdr = (struct efi_generic_dev_path *) data;
+	end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
+	while (hdr < end_addr) {
+		if (hdr->type == EFI_DEV_MSG &&
+		    hdr->sub_type == EFI_DEV_MSG_UART)
+			uart = 1;
+		else if (hdr->type == EFI_DEV_END_PATH ||
+			  hdr->type == EFI_DEV_END_PATH2) {
+			if (!uart)
+				return 0;
+			if (hdr->sub_type == EFI_DEV_END_ENTIRE)
+				return 1;
+			uart = 0;
+		}
+		hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
+	}
+	printk(KERN_ERR "Malformed %s value\n", name);
+	return 0;
+}
+
+/*
+ * Look for the first granule aligned memory descriptor memory
+ * that is big enough to hold EFI memory map. Make sure this
+ * descriptor is at least granule sized so it does not get trimmed
+ */
+struct kern_memdesc *
+find_memmap_space (void)
+{
+	u64	contig_low=0, contig_high=0;
+	u64	as = 0, ae;
+	void *efi_map_start, *efi_map_end, *p, *q;
+	efi_memory_desc_t *md, *pmd = NULL, *check_md;
+	u64	space_needed, efi_desc_size;
+	unsigned long total_mem = 0;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	/*
+	 * Worst case: we need 3 kernel descriptors for each efi descriptor
+	 * (if every entry has a WB part in the middle, and UC head and tail),
+	 * plus one for the end marker.
+	 */
+	space_needed = sizeof(kern_memdesc_t) *
+		(3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
+
+	for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
+		md = p;
+		if (!efi_wb(md)) {
+			continue;
+		}
+		if (pmd == NULL || !efi_wb(pmd) ||
+		    efi_md_end(pmd) != md->phys_addr) {
+			contig_low = GRANULEROUNDUP(md->phys_addr);
+			contig_high = efi_md_end(md);
+			for (q = p + efi_desc_size; q < efi_map_end;
+			     q += efi_desc_size) {
+				check_md = q;
+				if (!efi_wb(check_md))
+					break;
+				if (contig_high != check_md->phys_addr)
+					break;
+				contig_high = efi_md_end(check_md);
+			}
+			contig_high = GRANULEROUNDDOWN(contig_high);
+		}
+		if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
+			continue;
+
+		/* Round ends inward to granule boundaries */
+		as = max(contig_low, md->phys_addr);
+		ae = min(contig_high, efi_md_end(md));
+
+		/* keep within max_addr= and min_addr= command line arg */
+		as = max(as, min_addr);
+		ae = min(ae, max_addr);
+		if (ae <= as)
+			continue;
+
+		/* avoid going over mem= command line arg */
+		if (total_mem + (ae - as) > mem_limit)
+			ae -= total_mem + (ae - as) - mem_limit;
+
+		if (ae <= as)
+			continue;
+
+		if (ae - as > space_needed)
+			break;
+	}
+	if (p >= efi_map_end)
+		panic("Can't allocate space for kernel memory descriptors");
+
+	return __va(as);
+}
+
+/*
+ * Walk the EFI memory map and gather all memory available for kernel
+ * to use.  We can allocate partial granules only if the unavailable
+ * parts exist, and are WB.
+ */
+unsigned long
+efi_memmap_init(u64 *s, u64 *e)
+{
+	struct kern_memdesc *k, *prev = NULL;
+	u64	contig_low=0, contig_high=0;
+	u64	as, ae, lim;
+	void *efi_map_start, *efi_map_end, *p, *q;
+	efi_memory_desc_t *md, *pmd = NULL, *check_md;
+	u64	efi_desc_size;
+	unsigned long total_mem = 0;
+
+	k = kern_memmap = find_memmap_space();
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
+		md = p;
+		if (!efi_wb(md)) {
+			if (efi_uc(md) &&
+			    (md->type == EFI_CONVENTIONAL_MEMORY ||
+			     md->type == EFI_BOOT_SERVICES_DATA)) {
+				k->attribute = EFI_MEMORY_UC;
+				k->start = md->phys_addr;
+				k->num_pages = md->num_pages;
+				k++;
+			}
+			continue;
+		}
+		if (pmd == NULL || !efi_wb(pmd) ||
+		    efi_md_end(pmd) != md->phys_addr) {
+			contig_low = GRANULEROUNDUP(md->phys_addr);
+			contig_high = efi_md_end(md);
+			for (q = p + efi_desc_size; q < efi_map_end;
+			     q += efi_desc_size) {
+				check_md = q;
+				if (!efi_wb(check_md))
+					break;
+				if (contig_high != check_md->phys_addr)
+					break;
+				contig_high = efi_md_end(check_md);
+			}
+			contig_high = GRANULEROUNDDOWN(contig_high);
+		}
+		if (!is_memory_available(md))
+			continue;
+
+		/*
+		 * Round ends inward to granule boundaries
+		 * Give trimmings to uncached allocator
+		 */
+		if (md->phys_addr < contig_low) {
+			lim = min(efi_md_end(md), contig_low);
+			if (efi_uc(md)) {
+				if (k > kern_memmap &&
+				    (k-1)->attribute == EFI_MEMORY_UC &&
+				    kmd_end(k-1) == md->phys_addr) {
+					(k-1)->num_pages +=
+						(lim - md->phys_addr)
+						>> EFI_PAGE_SHIFT;
+				} else {
+					k->attribute = EFI_MEMORY_UC;
+					k->start = md->phys_addr;
+					k->num_pages = (lim - md->phys_addr)
+						>> EFI_PAGE_SHIFT;
+					k++;
+				}
+			}
+			as = contig_low;
+		} else
+			as = md->phys_addr;
+
+		if (efi_md_end(md) > contig_high) {
+			lim = max(md->phys_addr, contig_high);
+			if (efi_uc(md)) {
+				if (lim == md->phys_addr && k > kern_memmap &&
+				    (k-1)->attribute == EFI_MEMORY_UC &&
+				    kmd_end(k-1) == md->phys_addr) {
+					(k-1)->num_pages += md->num_pages;
+				} else {
+					k->attribute = EFI_MEMORY_UC;
+					k->start = lim;
+					k->num_pages = (efi_md_end(md) - lim)
+						>> EFI_PAGE_SHIFT;
+					k++;
+				}
+			}
+			ae = contig_high;
+		} else
+			ae = efi_md_end(md);
+
+		/* keep within max_addr= and min_addr= command line arg */
+		as = max(as, min_addr);
+		ae = min(ae, max_addr);
+		if (ae <= as)
+			continue;
+
+		/* avoid going over mem= command line arg */
+		if (total_mem + (ae - as) > mem_limit)
+			ae -= total_mem + (ae - as) - mem_limit;
+
+		if (ae <= as)
+			continue;
+		if (prev && kmd_end(prev) == md->phys_addr) {
+			prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
+			total_mem += ae - as;
+			continue;
+		}
+		k->attribute = EFI_MEMORY_WB;
+		k->start = as;
+		k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
+		total_mem += ae - as;
+		prev = k++;
+	}
+	k->start = ~0L; /* end-marker */
+
+	/* reserve the memory we are using for kern_memmap */
+	*s = (u64)kern_memmap;
+	*e = (u64)++k;
+
+	return total_mem;
+}
+
+void
+efi_initialize_iomem_resources(struct resource *code_resource,
+			       struct resource *data_resource,
+			       struct resource *bss_resource)
+{
+	struct resource *res;
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	u64 efi_desc_size;
+	char *name;
+	unsigned long flags, desc;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	res = NULL;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+
+		if (md->num_pages == 0) /* should not happen */
+			continue;
+
+		flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+		desc = IORES_DESC_NONE;
+
+		switch (md->type) {
+
+			case EFI_MEMORY_MAPPED_IO:
+			case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
+				continue;
+
+			case EFI_LOADER_CODE:
+			case EFI_LOADER_DATA:
+			case EFI_BOOT_SERVICES_DATA:
+			case EFI_BOOT_SERVICES_CODE:
+			case EFI_CONVENTIONAL_MEMORY:
+				if (md->attribute & EFI_MEMORY_WP) {
+					name = "System ROM";
+					flags |= IORESOURCE_READONLY;
+				} else if (md->attribute == EFI_MEMORY_UC) {
+					name = "Uncached RAM";
+				} else {
+					name = "System RAM";
+					flags |= IORESOURCE_SYSRAM;
+				}
+				break;
+
+			case EFI_ACPI_MEMORY_NVS:
+				name = "ACPI Non-volatile Storage";
+				desc = IORES_DESC_ACPI_NV_STORAGE;
+				break;
+
+			case EFI_UNUSABLE_MEMORY:
+				name = "reserved";
+				flags |= IORESOURCE_DISABLED;
+				break;
+
+			case EFI_PERSISTENT_MEMORY:
+				name = "Persistent Memory";
+				desc = IORES_DESC_PERSISTENT_MEMORY;
+				break;
+
+			case EFI_RESERVED_TYPE:
+			case EFI_RUNTIME_SERVICES_CODE:
+			case EFI_RUNTIME_SERVICES_DATA:
+			case EFI_ACPI_RECLAIM_MEMORY:
+			default:
+				name = "reserved";
+				break;
+		}
+
+		if ((res = kzalloc(sizeof(struct resource),
+				   GFP_KERNEL)) == NULL) {
+			printk(KERN_ERR
+			       "failed to allocate resource for iomem\n");
+			return;
+		}
+
+		res->name = name;
+		res->start = md->phys_addr;
+		res->end = md->phys_addr + efi_md_size(md) - 1;
+		res->flags = flags;
+		res->desc = desc;
+
+		if (insert_resource(&iomem_resource, res) < 0)
+			kfree(res);
+		else {
+			/*
+			 * We don't know which region contains
+			 * kernel data so we try it repeatedly and
+			 * let the resource manager test it.
+			 */
+			insert_resource(res, code_resource);
+			insert_resource(res, data_resource);
+			insert_resource(res, bss_resource);
+#ifdef CONFIG_KEXEC
+                        insert_resource(res, &efi_memmap_res);
+                        insert_resource(res, &boot_param_res);
+			if (crashk_res.end > crashk_res.start)
+				insert_resource(res, &crashk_res);
+#endif
+		}
+	}
+}
+
+#ifdef CONFIG_KEXEC
+/* find a block of memory aligned to 64M exclude reserved regions
+   rsvd_regions are sorted
+ */
+unsigned long __init
+kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
+{
+	int i;
+	u64 start, end;
+	u64 alignment = 1UL << _PAGE_SIZE_64M;
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	u64 efi_desc_size;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+		if (!efi_wb(md))
+			continue;
+		start = ALIGN(md->phys_addr, alignment);
+		end = efi_md_end(md);
+		for (i = 0; i < n; i++) {
+			if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
+				if (__pa(r[i].start) > start + size)
+					return start;
+				start = ALIGN(__pa(r[i].end), alignment);
+				if (i < n-1 &&
+				    __pa(r[i+1].start) < start + size)
+					continue;
+				else
+					break;
+			}
+		}
+		if (end > start + size)
+			return start;
+	}
+
+	printk(KERN_WARNING
+	       "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
+	return ~0UL;
+}
+#endif
+
+#ifdef CONFIG_CRASH_DUMP
+/* locate the size find a the descriptor at a certain address */
+unsigned long __init
+vmcore_find_descriptor_size (unsigned long address)
+{
+	void *efi_map_start, *efi_map_end, *p;
+	efi_memory_desc_t *md;
+	u64 efi_desc_size;
+	unsigned long ret = 0;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+		md = p;
+		if (efi_wb(md) && md->type == EFI_LOADER_DATA
+		    && md->phys_addr == address) {
+			ret = efi_md_size(md);
+			break;
+		}
+	}
+
+	if (ret == 0)
+		printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
+
+	return ret;
+}
+#endif
+
+char *efi_systab_show_arch(char *str)
+{
+	if (mps_phys != EFI_INVALID_TABLE_ADDR)
+		str += sprintf(str, "MPS=0x%lx\n", mps_phys);
+	if (hcdp_phys != EFI_INVALID_TABLE_ADDR)
+		str += sprintf(str, "HCDP=0x%lx\n", hcdp_phys);
+	return str;
+}
diff --git a/arch/ia64/kernel/efi_stub.S b/arch/ia64/kernel/efi_stub.S
new file mode 100644
index 000000000..1fd61b78f
--- /dev/null
+++ b/arch/ia64/kernel/efi_stub.S
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * EFI call stub.
+ *
+ * Copyright (C) 1999-2001 Hewlett-Packard Co
+ *	David Mosberger <davidm@hpl.hp.com>
+ *
+ * This stub allows us to make EFI calls in physical mode with interrupts
+ * turned off.  We need this because we can't call SetVirtualMap() until
+ * the kernel has booted far enough to allow allocation of struct vm_area_struct
+ * entries (which we would need to map stuff with memory attributes other
+ * than uncached or writeback...).  Since the GetTime() service gets called
+ * earlier than that, we need to be able to make physical mode EFI calls from
+ * the kernel.
+ */
+
+/*
+ * PSR settings as per SAL spec (Chapter 8 in the "IA-64 System
+ * Abstraction Layer Specification", revision 2.6e).  Note that
+ * psr.dfl and psr.dfh MUST be cleared, despite what this manual says.
+ * Otherwise, SAL dies whenever it's trying to do an IA-32 BIOS call
+ * (the br.ia instruction fails unless psr.dfl and psr.dfh are
+ * cleared).  Fortunately, SAL promises not to touch the floating
+ * point regs, so at least we don't have to save f2-f127.
+ */
+#define PSR_BITS_TO_CLEAR						\
+	(IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_RT |		\
+	 IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED |	\
+	 IA64_PSR_DFL | IA64_PSR_DFH)
+
+#define PSR_BITS_TO_SET							\
+	(IA64_PSR_BN)
+
+#include <asm/processor.h>
+#include <asm/asmmacro.h>
+
+/*
+ * Inputs:
+ *	in0 = address of function descriptor of EFI routine to call
+ *	in1..in7 = arguments to routine
+ *
+ * Outputs:
+ *	r8 = EFI_STATUS returned by called function
+ */
+
+GLOBAL_ENTRY(efi_call_phys)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
+	alloc loc1=ar.pfs,8,7,7,0
+	ld8 r2=[in0],8			// load EFI function's entry point
+	mov loc0=rp
+	.body
+	;;
+	mov loc2=gp			// save global pointer
+	mov loc4=ar.rsc			// save RSE configuration
+	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	;;
+	ld8 gp=[in0]			// load EFI function's global pointer
+	movl r16=PSR_BITS_TO_CLEAR
+	mov loc3=psr			// save processor status word
+	movl r17=PSR_BITS_TO_SET
+	;;
+	or loc3=loc3,r17
+	mov b6=r2
+	;;
+	andcm r16=loc3,r16	// get psr with IT, DT, and RT bits cleared
+	br.call.sptk.many rp=ia64_switch_mode_phys
+.ret0:	mov out4=in5
+	mov out0=in1
+	mov out1=in2
+	mov out2=in3
+	mov out3=in4
+	mov out5=in6
+	mov out6=in7
+	mov loc5=r19
+	mov loc6=r20
+	br.call.sptk.many rp=b6		// call the EFI function
+.ret1:	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	mov r16=loc3
+	mov r19=loc5
+	mov r20=loc6
+	br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
+.ret2:	mov ar.rsc=loc4			// restore RSE configuration
+	mov ar.pfs=loc1
+	mov rp=loc0
+	mov gp=loc2
+	br.ret.sptk.many rp
+END(efi_call_phys)
diff --git a/arch/ia64/kernel/elfcore.c b/arch/ia64/kernel/elfcore.c
new file mode 100644
index 000000000..8895df121
--- /dev/null
+++ b/arch/ia64/kernel/elfcore.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/elf.h>
+#include <linux/coredump.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+
+#include <asm/elf.h>
+
+
+Elf64_Half elf_core_extra_phdrs(struct coredump_params *cprm)
+{
+	return GATE_EHDR->e_phnum;
+}
+
+int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
+{
+	const struct elf_phdr *const gate_phdrs =
+		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
+	int i;
+	Elf64_Off ofs = 0;
+
+	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
+		struct elf_phdr phdr = gate_phdrs[i];
+
+		if (phdr.p_type == PT_LOAD) {
+			phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz);
+			phdr.p_filesz = phdr.p_memsz;
+			if (ofs == 0) {
+				ofs = phdr.p_offset = offset;
+				offset += phdr.p_filesz;
+			} else {
+				phdr.p_offset = ofs;
+			}
+		} else {
+			phdr.p_offset += ofs;
+		}
+		phdr.p_paddr = 0; /* match other core phdrs */
+		if (!dump_emit(cprm, &phdr, sizeof(phdr)))
+			return 0;
+	}
+	return 1;
+}
+
+int elf_core_write_extra_data(struct coredump_params *cprm)
+{
+	const struct elf_phdr *const gate_phdrs =
+		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
+	int i;
+
+	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
+		if (gate_phdrs[i].p_type == PT_LOAD) {
+			void *addr = (void *)gate_phdrs[i].p_vaddr;
+			size_t memsz = PAGE_ALIGN(gate_phdrs[i].p_memsz);
+
+			if (!dump_emit(cprm, addr, memsz))
+				return 0;
+			break;
+		}
+	}
+	return 1;
+}
+
+size_t elf_core_extra_data_size(struct coredump_params *cprm)
+{
+	const struct elf_phdr *const gate_phdrs =
+		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
+	int i;
+	size_t size = 0;
+
+	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
+		if (gate_phdrs[i].p_type == PT_LOAD) {
+			size += PAGE_ALIGN(gate_phdrs[i].p_memsz);
+			break;
+		}
+	}
+	return size;
+}
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
new file mode 100644
index 000000000..5eba3fb2e
--- /dev/null
+++ b/arch/ia64/kernel/entry.S
@@ -0,0 +1,1428 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arch/ia64/kernel/entry.S
+ *
+ * Kernel entry points.
+ *
+ * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999, 2002-2003
+ *	Asit Mallick <Asit.K.Mallick@intel.com>
+ * 	Don Dugger <Don.Dugger@intel.com>
+ *	Suresh Siddha <suresh.b.siddha@intel.com>
+ *	Fenghua Yu <fenghua.yu@intel.com>
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ */
+/*
+ * ia64_switch_to now places correct virtual mapping in in TR2 for
+ * kernel stack. This allows us to handle interrupts without changing
+ * to physical mode.
+ *
+ * Jonathan Nicklin	<nicklin@missioncriticallinux.com>
+ * Patrick O'Rourke	<orourke@missioncriticallinux.com>
+ * 11/07/2000
+ */
+/*
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *                    pv_ops.
+ */
+/*
+ * Global (preserved) predicate usage on syscall entry/exit path:
+ *
+ *	pKStk:		See entry.h.
+ *	pUStk:		See entry.h.
+ *	pSys:		See entry.h.
+ *	pNonSys:	!pSys
+ */
+
+
+#include <linux/pgtable.h>
+#include <asm/asmmacro.h>
+#include <asm/cache.h>
+#include <asm/errno.h>
+#include <asm/kregs.h>
+#include <asm/asm-offsets.h>
+#include <asm/percpu.h>
+#include <asm/processor.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+#include <asm/ftrace.h>
+#include <asm/export.h>
+
+#include "minstate.h"
+
+	/*
+	 * execve() is special because in case of success, we need to
+	 * setup a null register window frame.
+	 */
+ENTRY(ia64_execve)
+	/*
+	 * Allocate 8 input registers since ptrace() may clobber them
+	 */
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
+	alloc loc1=ar.pfs,8,2,3,0
+	mov loc0=rp
+	.body
+	mov out0=in0			// filename
+	;;				// stop bit between alloc and call
+	mov out1=in1			// argv
+	mov out2=in2			// envp
+	br.call.sptk.many rp=sys_execve
+.ret0:
+	cmp4.ge p6,p7=r8,r0
+	mov ar.pfs=loc1			// restore ar.pfs
+	sxt4 r8=r8			// return 64-bit result
+	;;
+	stf.spill [sp]=f0
+	mov rp=loc0
+(p6)	mov ar.pfs=r0			// clear ar.pfs on success
+(p7)	br.ret.sptk.many rp
+
+	/*
+	 * In theory, we'd have to zap this state only to prevent leaking of
+	 * security sensitive state (e.g., if current->mm->dumpable is zero).  However,
+	 * this executes in less than 20 cycles even on Itanium, so it's not worth
+	 * optimizing for...).
+	 */
+	mov ar.unat=0; 		mov ar.lc=0
+	mov r4=0;		mov f2=f0;		mov b1=r0
+	mov r5=0;		mov f3=f0;		mov b2=r0
+	mov r6=0;		mov f4=f0;		mov b3=r0
+	mov r7=0;		mov f5=f0;		mov b4=r0
+	ldf.fill f12=[sp];	mov f13=f0;		mov b5=r0
+	ldf.fill f14=[sp];	ldf.fill f15=[sp];	mov f16=f0
+	ldf.fill f17=[sp];	ldf.fill f18=[sp];	mov f19=f0
+	ldf.fill f20=[sp];	ldf.fill f21=[sp];	mov f22=f0
+	ldf.fill f23=[sp];	ldf.fill f24=[sp];	mov f25=f0
+	ldf.fill f26=[sp];	ldf.fill f27=[sp];	mov f28=f0
+	ldf.fill f29=[sp];	ldf.fill f30=[sp];	mov f31=f0
+	br.ret.sptk.many rp
+END(ia64_execve)
+
+/*
+ * sys_clone2(u64 flags, u64 ustack_base, u64 ustack_size, u64 parent_tidptr, u64 child_tidptr,
+ *	      u64 tls)
+ */
+GLOBAL_ENTRY(sys_clone2)
+	/*
+	 * Allocate 8 input registers since ptrace() may clobber them
+	 */
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
+	alloc r16=ar.pfs,8,2,6,0
+	DO_SAVE_SWITCH_STACK
+	mov loc0=rp
+	mov loc1=r16                             // save ar.pfs across ia64_clone
+	.body
+	mov out0=in0
+	mov out1=in1
+	mov out2=in2
+	mov out3=in3
+	mov out4=in4
+	mov out5=in5
+	br.call.sptk.many rp=ia64_clone
+.ret1:	.restore sp
+	adds sp=IA64_SWITCH_STACK_SIZE,sp	// pop the switch stack
+	mov ar.pfs=loc1
+	mov rp=loc0
+	br.ret.sptk.many rp
+END(sys_clone2)
+
+/*
+ * sys_clone(u64 flags, u64 ustack_base, u64 parent_tidptr, u64 child_tidptr, u64 tls)
+ *	Deprecated.  Use sys_clone2() instead.
+ */
+GLOBAL_ENTRY(sys_clone)
+	/*
+	 * Allocate 8 input registers since ptrace() may clobber them
+	 */
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
+	alloc r16=ar.pfs,8,2,6,0
+	DO_SAVE_SWITCH_STACK
+	mov loc0=rp
+	mov loc1=r16                             // save ar.pfs across ia64_clone
+	.body
+	mov out0=in0
+	mov out1=in1
+	mov out2=16				// stacksize (compensates for 16-byte scratch area)
+	mov out3=in3
+	mov out4=in4
+	mov out5=in5
+	br.call.sptk.many rp=ia64_clone
+.ret2:	.restore sp
+	adds sp=IA64_SWITCH_STACK_SIZE,sp	// pop the switch stack
+	mov ar.pfs=loc1
+	mov rp=loc0
+	br.ret.sptk.many rp
+END(sys_clone)
+
+/*
+ * prev_task <- ia64_switch_to(struct task_struct *next)
+ *	With Ingo's new scheduler, interrupts are disabled when this routine gets
+ *	called.  The code starting at .map relies on this.  The rest of the code
+ *	doesn't care about the interrupt masking status.
+ */
+GLOBAL_ENTRY(ia64_switch_to)
+	.prologue
+	alloc r16=ar.pfs,1,0,0,0
+	DO_SAVE_SWITCH_STACK
+	.body
+
+	adds r22=IA64_TASK_THREAD_KSP_OFFSET,r13
+	movl r25=init_task
+	mov r27=IA64_KR(CURRENT_STACK)
+	adds r21=IA64_TASK_THREAD_KSP_OFFSET,in0
+	dep r20=0,in0,61,3		// physical address of "next"
+	;;
+	st8 [r22]=sp			// save kernel stack pointer of old task
+	shr.u r26=r20,IA64_GRANULE_SHIFT
+	cmp.eq p7,p6=r25,in0
+	;;
+	/*
+	 * If we've already mapped this task's page, we can skip doing it again.
+	 */
+(p6)	cmp.eq p7,p6=r26,r27
+(p6)	br.cond.dpnt .map
+	;;
+.done:
+	ld8 sp=[r21]			// load kernel stack pointer of new task
+	MOV_TO_KR(CURRENT, in0, r8, r9)		// update "current" application register
+	mov r8=r13			// return pointer to previously running task
+	mov r13=in0			// set "current" pointer
+	;;
+	DO_LOAD_SWITCH_STACK
+
+#ifdef CONFIG_SMP
+	sync.i				// ensure "fc"s done by this CPU are visible on other CPUs
+#endif
+	br.ret.sptk.many rp		// boogie on out in new context
+
+.map:
+	RSM_PSR_IC(r25)			// interrupts (psr.i) are already disabled here
+	movl r25=PAGE_KERNEL
+	;;
+	srlz.d
+	or r23=r25,r20			// construct PA | page properties
+	mov r25=IA64_GRANULE_SHIFT<<2
+	;;
+	MOV_TO_ITIR(p0, r25, r8)
+	MOV_TO_IFA(in0, r8)		// VA of next task...
+	;;
+	mov r25=IA64_TR_CURRENT_STACK
+	MOV_TO_KR(CURRENT_STACK, r26, r8, r9)	// remember last page we mapped...
+	;;
+	itr.d dtr[r25]=r23		// wire in new mapping...
+	SSM_PSR_IC_AND_SRLZ_D(r8, r9)	// reenable the psr.ic bit
+	br.cond.sptk .done
+END(ia64_switch_to)
+
+/*
+ * Note that interrupts are enabled during save_switch_stack and load_switch_stack.  This
+ * means that we may get an interrupt with "sp" pointing to the new kernel stack while
+ * ar.bspstore is still pointing to the old kernel backing store area.  Since ar.rsc,
+ * ar.rnat, ar.bsp, and ar.bspstore are all preserved by interrupts, this is not a
+ * problem.  Also, we don't need to specify unwind information for preserved registers
+ * that are not modified in save_switch_stack as the right unwind information is already
+ * specified at the call-site of save_switch_stack.
+ */
+
+/*
+ * save_switch_stack:
+ *	- r16 holds ar.pfs
+ *	- b7 holds address to return to
+ *	- rp (b0) holds return address to save
+ */
+GLOBAL_ENTRY(save_switch_stack)
+	.prologue
+	.altrp b7
+	flushrs			// flush dirty regs to backing store (must be first in insn group)
+	.save @priunat,r17
+	mov r17=ar.unat		// preserve caller's
+	.body
+#ifdef CONFIG_ITANIUM
+	adds r2=16+128,sp
+	adds r3=16+64,sp
+	adds r14=SW(R4)+16,sp
+	;;
+	st8.spill [r14]=r4,16		// spill r4
+	lfetch.fault.excl.nt1 [r3],128
+	;;
+	lfetch.fault.excl.nt1 [r2],128
+	lfetch.fault.excl.nt1 [r3],128
+	;;
+	lfetch.fault.excl [r2]
+	lfetch.fault.excl [r3]
+	adds r15=SW(R5)+16,sp
+#else
+	add r2=16+3*128,sp
+	add r3=16,sp
+	add r14=SW(R4)+16,sp
+	;;
+	st8.spill [r14]=r4,SW(R6)-SW(R4)	// spill r4 and prefetch offset 0x1c0
+	lfetch.fault.excl.nt1 [r3],128	//		prefetch offset 0x010
+	;;
+	lfetch.fault.excl.nt1 [r3],128	//		prefetch offset 0x090
+	lfetch.fault.excl.nt1 [r2],128	//		prefetch offset 0x190
+	;;
+	lfetch.fault.excl.nt1 [r3]	//		prefetch offset 0x110
+	lfetch.fault.excl.nt1 [r2]	//		prefetch offset 0x210
+	adds r15=SW(R5)+16,sp
+#endif
+	;;
+	st8.spill [r15]=r5,SW(R7)-SW(R5)	// spill r5
+	mov.m ar.rsc=0			// put RSE in mode: enforced lazy, little endian, pl 0
+	add r2=SW(F2)+16,sp		// r2 = &sw->f2
+	;;
+	st8.spill [r14]=r6,SW(B0)-SW(R6)	// spill r6
+	mov.m r18=ar.fpsr		// preserve fpsr
+	add r3=SW(F3)+16,sp		// r3 = &sw->f3
+	;;
+	stf.spill [r2]=f2,32
+	mov.m r19=ar.rnat
+	mov r21=b0
+
+	stf.spill [r3]=f3,32
+	st8.spill [r15]=r7,SW(B2)-SW(R7)	// spill r7
+	mov r22=b1
+	;;
+	// since we're done with the spills, read and save ar.unat:
+	mov.m r29=ar.unat
+	mov.m r20=ar.bspstore
+	mov r23=b2
+	stf.spill [r2]=f4,32
+	stf.spill [r3]=f5,32
+	mov r24=b3
+	;;
+	st8 [r14]=r21,SW(B1)-SW(B0)		// save b0
+	st8 [r15]=r23,SW(B3)-SW(B2)		// save b2
+	mov r25=b4
+	mov r26=b5
+	;;
+	st8 [r14]=r22,SW(B4)-SW(B1)		// save b1
+	st8 [r15]=r24,SW(AR_PFS)-SW(B3)		// save b3
+	mov r21=ar.lc		// I-unit
+	stf.spill [r2]=f12,32
+	stf.spill [r3]=f13,32
+	;;
+	st8 [r14]=r25,SW(B5)-SW(B4)		// save b4
+	st8 [r15]=r16,SW(AR_LC)-SW(AR_PFS)	// save ar.pfs
+	stf.spill [r2]=f14,32
+	stf.spill [r3]=f15,32
+	;;
+	st8 [r14]=r26				// save b5
+	st8 [r15]=r21				// save ar.lc
+	stf.spill [r2]=f16,32
+	stf.spill [r3]=f17,32
+	;;
+	stf.spill [r2]=f18,32
+	stf.spill [r3]=f19,32
+	;;
+	stf.spill [r2]=f20,32
+	stf.spill [r3]=f21,32
+	;;
+	stf.spill [r2]=f22,32
+	stf.spill [r3]=f23,32
+	;;
+	stf.spill [r2]=f24,32
+	stf.spill [r3]=f25,32
+	;;
+	stf.spill [r2]=f26,32
+	stf.spill [r3]=f27,32
+	;;
+	stf.spill [r2]=f28,32
+	stf.spill [r3]=f29,32
+	;;
+	stf.spill [r2]=f30,SW(AR_UNAT)-SW(F30)
+	stf.spill [r3]=f31,SW(PR)-SW(F31)
+	add r14=SW(CALLER_UNAT)+16,sp
+	;;
+	st8 [r2]=r29,SW(AR_RNAT)-SW(AR_UNAT)	// save ar.unat
+	st8 [r14]=r17,SW(AR_FPSR)-SW(CALLER_UNAT) // save caller_unat
+	mov r21=pr
+	;;
+	st8 [r2]=r19,SW(AR_BSPSTORE)-SW(AR_RNAT) // save ar.rnat
+	st8 [r3]=r21				// save predicate registers
+	;;
+	st8 [r2]=r20				// save ar.bspstore
+	st8 [r14]=r18				// save fpsr
+	mov ar.rsc=3		// put RSE back into eager mode, pl 0
+	br.cond.sptk.many b7
+END(save_switch_stack)
+
+/*
+ * load_switch_stack:
+ *	- "invala" MUST be done at call site (normally in DO_LOAD_SWITCH_STACK)
+ *	- b7 holds address to return to
+ *	- must not touch r8-r11
+ */
+GLOBAL_ENTRY(load_switch_stack)
+	.prologue
+	.altrp b7
+
+	.body
+	lfetch.fault.nt1 [sp]
+	adds r2=SW(AR_BSPSTORE)+16,sp
+	adds r3=SW(AR_UNAT)+16,sp
+	mov ar.rsc=0						// put RSE into enforced lazy mode
+	adds r14=SW(CALLER_UNAT)+16,sp
+	adds r15=SW(AR_FPSR)+16,sp
+	;;
+	ld8 r27=[r2],(SW(B0)-SW(AR_BSPSTORE))	// bspstore
+	ld8 r29=[r3],(SW(B1)-SW(AR_UNAT))	// unat
+	;;
+	ld8 r21=[r2],16		// restore b0
+	ld8 r22=[r3],16		// restore b1
+	;;
+	ld8 r23=[r2],16		// restore b2
+	ld8 r24=[r3],16		// restore b3
+	;;
+	ld8 r25=[r2],16		// restore b4
+	ld8 r26=[r3],16		// restore b5
+	;;
+	ld8 r16=[r2],(SW(PR)-SW(AR_PFS))	// ar.pfs
+	ld8 r17=[r3],(SW(AR_RNAT)-SW(AR_LC))	// ar.lc
+	;;
+	ld8 r28=[r2]		// restore pr
+	ld8 r30=[r3]		// restore rnat
+	;;
+	ld8 r18=[r14],16	// restore caller's unat
+	ld8 r19=[r15],24	// restore fpsr
+	;;
+	ldf.fill f2=[r14],32
+	ldf.fill f3=[r15],32
+	;;
+	ldf.fill f4=[r14],32
+	ldf.fill f5=[r15],32
+	;;
+	ldf.fill f12=[r14],32
+	ldf.fill f13=[r15],32
+	;;
+	ldf.fill f14=[r14],32
+	ldf.fill f15=[r15],32
+	;;
+	ldf.fill f16=[r14],32
+	ldf.fill f17=[r15],32
+	;;
+	ldf.fill f18=[r14],32
+	ldf.fill f19=[r15],32
+	mov b0=r21
+	;;
+	ldf.fill f20=[r14],32
+	ldf.fill f21=[r15],32
+	mov b1=r22
+	;;
+	ldf.fill f22=[r14],32
+	ldf.fill f23=[r15],32
+	mov b2=r23
+	;;
+	mov ar.bspstore=r27
+	mov ar.unat=r29		// establish unat holding the NaT bits for r4-r7
+	mov b3=r24
+	;;
+	ldf.fill f24=[r14],32
+	ldf.fill f25=[r15],32
+	mov b4=r25
+	;;
+	ldf.fill f26=[r14],32
+	ldf.fill f27=[r15],32
+	mov b5=r26
+	;;
+	ldf.fill f28=[r14],32
+	ldf.fill f29=[r15],32
+	mov ar.pfs=r16
+	;;
+	ldf.fill f30=[r14],32
+	ldf.fill f31=[r15],24
+	mov ar.lc=r17
+	;;
+	ld8.fill r4=[r14],16
+	ld8.fill r5=[r15],16
+	mov pr=r28,-1
+	;;
+	ld8.fill r6=[r14],16
+	ld8.fill r7=[r15],16
+
+	mov ar.unat=r18				// restore caller's unat
+	mov ar.rnat=r30				// must restore after bspstore but before rsc!
+	mov ar.fpsr=r19				// restore fpsr
+	mov ar.rsc=3				// put RSE back into eager mode, pl 0
+	br.cond.sptk.many b7
+END(load_switch_stack)
+
+	/*
+	 * Invoke a system call, but do some tracing before and after the call.
+	 * We MUST preserve the current register frame throughout this routine
+	 * because some system calls (such as ia64_execve) directly
+	 * manipulate ar.pfs.
+	 */
+GLOBAL_ENTRY(ia64_trace_syscall)
+	PT_REGS_UNWIND_INFO(0)
+	/*
+	 * We need to preserve the scratch registers f6-f11 in case the system
+	 * call is sigreturn.
+	 */
+	adds r16=PT(F6)+16,sp
+	adds r17=PT(F7)+16,sp
+	;;
+ 	stf.spill [r16]=f6,32
+ 	stf.spill [r17]=f7,32
+	;;
+ 	stf.spill [r16]=f8,32
+ 	stf.spill [r17]=f9,32
+	;;
+ 	stf.spill [r16]=f10
+ 	stf.spill [r17]=f11
+	br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args
+	cmp.lt p6,p0=r8,r0			// check tracehook
+	adds r2=PT(R8)+16,sp			// r2 = &pt_regs.r8
+	adds r3=PT(R10)+16,sp			// r3 = &pt_regs.r10
+	mov r10=0
+(p6)	br.cond.sptk strace_error		// syscall failed ->
+	adds r16=PT(F6)+16,sp
+	adds r17=PT(F7)+16,sp
+	;;
+	ldf.fill f6=[r16],32
+	ldf.fill f7=[r17],32
+	;;
+	ldf.fill f8=[r16],32
+	ldf.fill f9=[r17],32
+	;;
+	ldf.fill f10=[r16]
+	ldf.fill f11=[r17]
+	// the syscall number may have changed, so re-load it and re-calculate the
+	// syscall entry-point:
+	adds r15=PT(R15)+16,sp			// r15 = &pt_regs.r15 (syscall #)
+	;;
+	ld8 r15=[r15]
+	mov r3=NR_syscalls - 1
+	;;
+	adds r15=-1024,r15
+	movl r16=sys_call_table
+	;;
+	shladd r20=r15,3,r16			// r20 = sys_call_table + 8*(syscall-1024)
+	cmp.leu p6,p7=r15,r3
+	;;
+(p6)	ld8 r20=[r20]				// load address of syscall entry point
+(p7)	movl r20=sys_ni_syscall
+	;;
+	mov b6=r20
+	br.call.sptk.many rp=b6			// do the syscall
+.strace_check_retval:
+	cmp.lt p6,p0=r8,r0			// syscall failed?
+	adds r2=PT(R8)+16,sp			// r2 = &pt_regs.r8
+	adds r3=PT(R10)+16,sp			// r3 = &pt_regs.r10
+	mov r10=0
+(p6)	br.cond.sptk strace_error		// syscall failed ->
+	;;					// avoid RAW on r10
+.strace_save_retval:
+.mem.offset 0,0; st8.spill [r2]=r8		// store return value in slot for r8
+.mem.offset 8,0; st8.spill [r3]=r10		// clear error indication in slot for r10
+	br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
+.ret3:
+(pUStk)	cmp.eq.unc p6,p0=r0,r0			// p6 <- pUStk
+(pUStk)	rsm psr.i				// disable interrupts
+	br.cond.sptk ia64_work_pending_syscall_end
+
+strace_error:
+	ld8 r3=[r2]				// load pt_regs.r8
+	sub r9=0,r8				// negate return value to get errno value
+	;;
+	cmp.ne p6,p0=r3,r0			// is pt_regs.r8!=0?
+	adds r3=16,r2				// r3=&pt_regs.r10
+	;;
+(p6)	mov r10=-1
+(p6)	mov r8=r9
+	br.cond.sptk .strace_save_retval
+END(ia64_trace_syscall)
+
+	/*
+	 * When traced and returning from sigreturn, we invoke syscall_trace but then
+	 * go straight to ia64_leave_kernel rather than ia64_leave_syscall.
+	 */
+GLOBAL_ENTRY(ia64_strace_leave_kernel)
+	PT_REGS_UNWIND_INFO(0)
+{	/*
+	 * Some versions of gas generate bad unwind info if the first instruction of a
+	 * procedure doesn't go into the first slot of a bundle.  This is a workaround.
+	 */
+	nop.m 0
+	nop.i 0
+	br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
+}
+.ret4:	br.cond.sptk ia64_leave_kernel
+END(ia64_strace_leave_kernel)
+
+ENTRY(call_payload)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(0)
+	/* call the kernel_thread payload; fn is in r4, arg - in r5 */
+	alloc loc1=ar.pfs,0,3,1,0
+	mov loc0=rp
+	mov loc2=gp
+	mov out0=r5		// arg
+	ld8 r14 = [r4], 8	// fn.address
+	;;
+	mov b6 = r14
+	ld8 gp = [r4]		// fn.gp
+	;;
+	br.call.sptk.many rp=b6	// fn(arg)
+.ret12:	mov gp=loc2
+	mov rp=loc0
+	mov ar.pfs=loc1
+	/* ... and if it has returned, we are going to userland */
+	cmp.ne pKStk,pUStk=r0,r0
+	br.ret.sptk.many rp
+END(call_payload)
+
+GLOBAL_ENTRY(ia64_ret_from_clone)
+	PT_REGS_UNWIND_INFO(0)
+{	/*
+	 * Some versions of gas generate bad unwind info if the first instruction of a
+	 * procedure doesn't go into the first slot of a bundle.  This is a workaround.
+	 */
+	nop.m 0
+	nop.i 0
+	/*
+	 * We need to call schedule_tail() to complete the scheduling process.
+	 * Called by ia64_switch_to() after ia64_clone()->copy_thread().  r8 contains the
+	 * address of the previously executing task.
+	 */
+	br.call.sptk.many rp=ia64_invoke_schedule_tail
+}
+.ret8:
+(pKStk)	br.call.sptk.many rp=call_payload
+	adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
+	;;
+	ld4 r2=[r2]
+	;;
+	mov r8=0
+	and r2=_TIF_SYSCALL_TRACEAUDIT,r2
+	;;
+	cmp.ne p6,p0=r2,r0
+(p6)	br.cond.spnt .strace_check_retval
+	;;					// added stop bits to prevent r8 dependency
+END(ia64_ret_from_clone)
+	// fall through
+GLOBAL_ENTRY(ia64_ret_from_syscall)
+	PT_REGS_UNWIND_INFO(0)
+	cmp.ge p6,p7=r8,r0			// syscall executed successfully?
+	adds r2=PT(R8)+16,sp			// r2 = &pt_regs.r8
+	mov r10=r0				// clear error indication in r10
+(p7)	br.cond.spnt handle_syscall_error	// handle potential syscall failure
+END(ia64_ret_from_syscall)
+	// fall through
+
+/*
+ * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
+ *	need to switch to bank 0 and doesn't restore the scratch registers.
+ *	To avoid leaking kernel bits, the scratch registers are set to
+ *	the following known-to-be-safe values:
+ *
+ *		  r1: restored (global pointer)
+ *		  r2: cleared
+ *		  r3: 1 (when returning to user-level)
+ *	      r8-r11: restored (syscall return value(s))
+ *		 r12: restored (user-level stack pointer)
+ *		 r13: restored (user-level thread pointer)
+ *		 r14: set to __kernel_syscall_via_epc
+ *		 r15: restored (syscall #)
+ *	     r16-r17: cleared
+ *		 r18: user-level b6
+ *		 r19: cleared
+ *		 r20: user-level ar.fpsr
+ *		 r21: user-level b0
+ *		 r22: cleared
+ *		 r23: user-level ar.bspstore
+ *		 r24: user-level ar.rnat
+ *		 r25: user-level ar.unat
+ *		 r26: user-level ar.pfs
+ *		 r27: user-level ar.rsc
+ *		 r28: user-level ip
+ *		 r29: user-level psr
+ *		 r30: user-level cfm
+ *		 r31: user-level pr
+ *	      f6-f11: cleared
+ *		  pr: restored (user-level pr)
+ *		  b0: restored (user-level rp)
+ *	          b6: restored
+ *		  b7: set to __kernel_syscall_via_epc
+ *	     ar.unat: restored (user-level ar.unat)
+ *	      ar.pfs: restored (user-level ar.pfs)
+ *	      ar.rsc: restored (user-level ar.rsc)
+ *	     ar.rnat: restored (user-level ar.rnat)
+ *	 ar.bspstore: restored (user-level ar.bspstore)
+ *	     ar.fpsr: restored (user-level ar.fpsr)
+ *	      ar.ccv: cleared
+ *	      ar.csd: cleared
+ *	      ar.ssd: cleared
+ */
+GLOBAL_ENTRY(ia64_leave_syscall)
+	PT_REGS_UNWIND_INFO(0)
+	/*
+	 * work.need_resched etc. mustn't get changed by this CPU before it returns to
+	 * user- or fsys-mode, hence we disable interrupts early on.
+	 *
+	 * p6 controls whether current_thread_info()->flags needs to be check for
+	 * extra work.  We always check for extra work when returning to user-level.
+	 * With CONFIG_PREEMPTION, we also check for extra work when the preempt_count
+	 * is 0.  After extra work processing has been completed, execution
+	 * resumes at ia64_work_processed_syscall with p6 set to 1 if the extra-work-check
+	 * needs to be redone.
+	 */
+#ifdef CONFIG_PREEMPTION
+	RSM_PSR_I(p0, r2, r18)			// disable interrupts
+	cmp.eq pLvSys,p0=r0,r0			// pLvSys=1: leave from syscall
+(pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
+	;;
+	.pred.rel.mutex pUStk,pKStk
+(pKStk) ld4 r21=[r20]			// r21 <- preempt_count
+(pUStk)	mov r21=0			// r21 <- 0
+	;;
+	cmp.eq p6,p0=r21,r0		// p6 <- pUStk || (preempt_count == 0)
+#else /* !CONFIG_PREEMPTION */
+	RSM_PSR_I(pUStk, r2, r18)
+	cmp.eq pLvSys,p0=r0,r0		// pLvSys=1: leave from syscall
+(pUStk)	cmp.eq.unc p6,p0=r0,r0		// p6 <- pUStk
+#endif
+.global ia64_work_processed_syscall;
+ia64_work_processed_syscall:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	adds r2=PT(LOADRS)+16,r12
+	MOV_FROM_ITC(pUStk, p9, r22, r19)	// fetch time at leave
+	adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
+	;;
+(p6)	ld4 r31=[r18]				// load current_thread_info()->flags
+	ld8 r19=[r2],PT(B6)-PT(LOADRS)		// load ar.rsc value for "loadrs"
+	adds r3=PT(AR_BSPSTORE)+16,r12		// deferred
+	;;
+#else
+	adds r2=PT(LOADRS)+16,r12
+	adds r3=PT(AR_BSPSTORE)+16,r12
+	adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
+	;;
+(p6)	ld4 r31=[r18]				// load current_thread_info()->flags
+	ld8 r19=[r2],PT(B6)-PT(LOADRS)		// load ar.rsc value for "loadrs"
+	nop.i 0
+	;;
+#endif
+	mov r16=ar.bsp				// M2  get existing backing store pointer
+	ld8 r18=[r2],PT(R9)-PT(B6)		// load b6
+(p6)	and r15=TIF_WORK_MASK,r31		// any work other than TIF_SYSCALL_TRACE?
+	;;
+	ld8 r23=[r3],PT(R11)-PT(AR_BSPSTORE)	// load ar.bspstore (may be garbage)
+(p6)	cmp4.ne.unc p6,p0=r15, r0		// any special work pending?
+(p6)	br.cond.spnt .work_pending_syscall
+	;;
+	// start restoring the state saved on the kernel stack (struct pt_regs):
+	ld8 r9=[r2],PT(CR_IPSR)-PT(R9)
+	ld8 r11=[r3],PT(CR_IIP)-PT(R11)
+(pNonSys) break 0		//      bug check: we shouldn't be here if pNonSys is TRUE!
+	;;
+	invala			// M0|1 invalidate ALAT
+	RSM_PSR_I_IC(r28, r29, r30)	// M2   turn off interrupts and interruption collection
+	cmp.eq p9,p0=r0,r0	// A    set p9 to indicate that we should restore cr.ifs
+
+	ld8 r29=[r2],16		// M0|1 load cr.ipsr
+	ld8 r28=[r3],16		// M0|1 load cr.iip
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+(pUStk) add r14=TI_AC_LEAVE+IA64_TASK_SIZE,r13
+	;;
+	ld8 r30=[r2],16		// M0|1 load cr.ifs
+	ld8 r25=[r3],16		// M0|1 load ar.unat
+(pUStk) add r15=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
+	;;
+#else
+	mov r22=r0		// A    clear r22
+	;;
+	ld8 r30=[r2],16		// M0|1 load cr.ifs
+	ld8 r25=[r3],16		// M0|1 load ar.unat
+(pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
+	;;
+#endif
+	ld8 r26=[r2],PT(B0)-PT(AR_PFS)	// M0|1 load ar.pfs
+	MOV_FROM_PSR(pKStk, r22, r21)	// M2   read PSR now that interrupts are disabled
+	nop 0
+	;;
+	ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
+	ld8 r27=[r3],PT(PR)-PT(AR_RSC)	// M0|1 load ar.rsc
+	mov f6=f0			// F    clear f6
+	;;
+	ld8 r24=[r2],PT(AR_FPSR)-PT(AR_RNAT)	// M0|1 load ar.rnat (may be garbage)
+	ld8 r31=[r3],PT(R1)-PT(PR)		// M0|1 load predicates
+	mov f7=f0				// F    clear f7
+	;;
+	ld8 r20=[r2],PT(R12)-PT(AR_FPSR)	// M0|1 load ar.fpsr
+	ld8.fill r1=[r3],16			// M0|1 load r1
+(pUStk) mov r17=1				// A
+	;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+(pUStk) st1 [r15]=r17				// M2|3
+#else
+(pUStk) st1 [r14]=r17				// M2|3
+#endif
+	ld8.fill r13=[r3],16			// M0|1
+	mov f8=f0				// F    clear f8
+	;;
+	ld8.fill r12=[r2]			// M0|1 restore r12 (sp)
+	ld8.fill r15=[r3]			// M0|1 restore r15
+	mov b6=r18				// I0   restore b6
+
+	LOAD_PHYS_STACK_REG_SIZE(r17)
+	mov f9=f0					// F    clear f9
+(pKStk) br.cond.dpnt.many skip_rbs_switch		// B
+
+	srlz.d				// M0   ensure interruption collection is off (for cover)
+	shr.u r18=r19,16		// I0|1 get byte size of existing "dirty" partition
+	COVER				// B    add current frame into dirty partition & set cr.ifs
+	;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	mov r19=ar.bsp			// M2   get new backing store pointer
+	st8 [r14]=r22			// M	save time at leave
+	mov f10=f0			// F    clear f10
+
+	mov r22=r0			// A	clear r22
+	movl r14=__kernel_syscall_via_epc // X
+	;;
+#else
+	mov r19=ar.bsp			// M2   get new backing store pointer
+	mov f10=f0			// F    clear f10
+
+	nop.m 0
+	movl r14=__kernel_syscall_via_epc // X
+	;;
+#endif
+	mov.m ar.csd=r0			// M2   clear ar.csd
+	mov.m ar.ccv=r0			// M2   clear ar.ccv
+	mov b7=r14			// I0   clear b7 (hint with __kernel_syscall_via_epc)
+
+	mov.m ar.ssd=r0			// M2   clear ar.ssd
+	mov f11=f0			// F    clear f11
+	br.cond.sptk.many rbs_switch	// B
+END(ia64_leave_syscall)
+
+GLOBAL_ENTRY(ia64_leave_kernel)
+	PT_REGS_UNWIND_INFO(0)
+	/*
+	 * work.need_resched etc. mustn't get changed by this CPU before it returns to
+	 * user- or fsys-mode, hence we disable interrupts early on.
+	 *
+	 * p6 controls whether current_thread_info()->flags needs to be check for
+	 * extra work.  We always check for extra work when returning to user-level.
+	 * With CONFIG_PREEMPTION, we also check for extra work when the preempt_count
+	 * is 0.  After extra work processing has been completed, execution
+	 * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
+	 * needs to be redone.
+	 */
+#ifdef CONFIG_PREEMPTION
+	RSM_PSR_I(p0, r17, r31)			// disable interrupts
+	cmp.eq p0,pLvSys=r0,r0			// pLvSys=0: leave from kernel
+(pKStk)	adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
+	;;
+	.pred.rel.mutex pUStk,pKStk
+(pKStk)	ld4 r21=[r20]			// r21 <- preempt_count
+(pUStk)	mov r21=0			// r21 <- 0
+	;;
+	cmp.eq p6,p0=r21,r0		// p6 <- pUStk || (preempt_count == 0)
+#else
+	RSM_PSR_I(pUStk, r17, r31)
+	cmp.eq p0,pLvSys=r0,r0		// pLvSys=0: leave from kernel
+(pUStk)	cmp.eq.unc p6,p0=r0,r0		// p6 <- pUStk
+#endif
+.work_processed_kernel:
+	adds r17=TI_FLAGS+IA64_TASK_SIZE,r13
+	;;
+(p6)	ld4 r31=[r17]				// load current_thread_info()->flags
+	adds r21=PT(PR)+16,r12
+	;;
+
+	lfetch [r21],PT(CR_IPSR)-PT(PR)
+	adds r2=PT(B6)+16,r12
+	adds r3=PT(R16)+16,r12
+	;;
+	lfetch [r21]
+	ld8 r28=[r2],8		// load b6
+	adds r29=PT(R24)+16,r12
+
+	ld8.fill r16=[r3],PT(AR_CSD)-PT(R16)
+	adds r30=PT(AR_CCV)+16,r12
+(p6)	and r19=TIF_WORK_MASK,r31		// any work other than TIF_SYSCALL_TRACE?
+	;;
+	ld8.fill r24=[r29]
+	ld8 r15=[r30]		// load ar.ccv
+(p6)	cmp4.ne.unc p6,p0=r19, r0		// any special work pending?
+	;;
+	ld8 r29=[r2],16		// load b7
+	ld8 r30=[r3],16		// load ar.csd
+(p6)	br.cond.spnt .work_pending
+	;;
+	ld8 r31=[r2],16		// load ar.ssd
+	ld8.fill r8=[r3],16
+	;;
+	ld8.fill r9=[r2],16
+	ld8.fill r10=[r3],PT(R17)-PT(R10)
+	;;
+	ld8.fill r11=[r2],PT(R18)-PT(R11)
+	ld8.fill r17=[r3],16
+	;;
+	ld8.fill r18=[r2],16
+	ld8.fill r19=[r3],16
+	;;
+	ld8.fill r20=[r2],16
+	ld8.fill r21=[r3],16
+	mov ar.csd=r30
+	mov ar.ssd=r31
+	;;
+	RSM_PSR_I_IC(r23, r22, r25)	// initiate turning off of interrupt and interruption collection
+	invala			// invalidate ALAT
+	;;
+	ld8.fill r22=[r2],24
+	ld8.fill r23=[r3],24
+	mov b6=r28
+	;;
+	ld8.fill r25=[r2],16
+	ld8.fill r26=[r3],16
+	mov b7=r29
+	;;
+	ld8.fill r27=[r2],16
+	ld8.fill r28=[r3],16
+	;;
+	ld8.fill r29=[r2],16
+	ld8.fill r30=[r3],24
+	;;
+	ld8.fill r31=[r2],PT(F9)-PT(R31)
+	adds r3=PT(F10)-PT(F6),r3
+	;;
+	ldf.fill f9=[r2],PT(F6)-PT(F9)
+	ldf.fill f10=[r3],PT(F8)-PT(F10)
+	;;
+	ldf.fill f6=[r2],PT(F7)-PT(F6)
+	;;
+	ldf.fill f7=[r2],PT(F11)-PT(F7)
+	ldf.fill f8=[r3],32
+	;;
+	srlz.d	// ensure that inter. collection is off (VHPT is don't care, since text is pinned)
+	mov ar.ccv=r15
+	;;
+	ldf.fill f11=[r2]
+	BSW_0(r2, r3, r15)	// switch back to bank 0 (no stop bit required beforehand...)
+	;;
+(pUStk)	mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency)
+	adds r16=PT(CR_IPSR)+16,r12
+	adds r17=PT(CR_IIP)+16,r12
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	.pred.rel.mutex pUStk,pKStk
+	MOV_FROM_PSR(pKStk, r22, r29)	// M2 read PSR now that interrupts are disabled
+	MOV_FROM_ITC(pUStk, p9, r22, r29)	// M  fetch time at leave
+	nop.i 0
+	;;
+#else
+	MOV_FROM_PSR(pKStk, r22, r29)	// M2 read PSR now that interrupts are disabled
+	nop.i 0
+	nop.i 0
+	;;
+#endif
+	ld8 r29=[r16],16	// load cr.ipsr
+	ld8 r28=[r17],16	// load cr.iip
+	;;
+	ld8 r30=[r16],16	// load cr.ifs
+	ld8 r25=[r17],16	// load ar.unat
+	;;
+	ld8 r26=[r16],16	// load ar.pfs
+	ld8 r27=[r17],16	// load ar.rsc
+	cmp.eq p9,p0=r0,r0	// set p9 to indicate that we should restore cr.ifs
+	;;
+	ld8 r24=[r16],16	// load ar.rnat (may be garbage)
+	ld8 r23=[r17],16	// load ar.bspstore (may be garbage)
+	;;
+	ld8 r31=[r16],16	// load predicates
+	ld8 r21=[r17],16	// load b0
+	;;
+	ld8 r19=[r16],16	// load ar.rsc value for "loadrs"
+	ld8.fill r1=[r17],16	// load r1
+	;;
+	ld8.fill r12=[r16],16
+	ld8.fill r13=[r17],16
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+(pUStk)	adds r3=TI_AC_LEAVE+IA64_TASK_SIZE,r18
+#else
+(pUStk)	adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18
+#endif
+	;;
+	ld8 r20=[r16],16	// ar.fpsr
+	ld8.fill r15=[r17],16
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+(pUStk)	adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18	// deferred
+#endif
+	;;
+	ld8.fill r14=[r16],16
+	ld8.fill r2=[r17]
+(pUStk)	mov r17=1
+	;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	//  mmi_ :  ld8 st1 shr;;         mmi_ : st8 st1 shr;;
+	//  mib  :  mov add br        ->  mib  : ld8 add br
+	//  bbb_ :  br  nop cover;;       mbb_ : mov br  cover;;
+	//
+	//  no one require bsp in r16 if (pKStk) branch is selected.
+(pUStk)	st8 [r3]=r22		// save time at leave
+(pUStk)	st1 [r18]=r17		// restore current->thread.on_ustack
+	shr.u r18=r19,16	// get byte size of existing "dirty" partition
+	;;
+	ld8.fill r3=[r16]	// deferred
+	LOAD_PHYS_STACK_REG_SIZE(r17)
+(pKStk)	br.cond.dpnt skip_rbs_switch
+	mov r16=ar.bsp		// get existing backing store pointer
+#else
+	ld8.fill r3=[r16]
+(pUStk)	st1 [r18]=r17		// restore current->thread.on_ustack
+	shr.u r18=r19,16	// get byte size of existing "dirty" partition
+	;;
+	mov r16=ar.bsp		// get existing backing store pointer
+	LOAD_PHYS_STACK_REG_SIZE(r17)
+(pKStk)	br.cond.dpnt skip_rbs_switch
+#endif
+
+	/*
+	 * Restore user backing store.
+	 *
+	 * NOTE: alloc, loadrs, and cover can't be predicated.
+	 */
+(pNonSys) br.cond.dpnt dont_preserve_current_frame
+	COVER				// add current frame into dirty partition and set cr.ifs
+	;;
+	mov r19=ar.bsp			// get new backing store pointer
+rbs_switch:
+	sub r16=r16,r18			// krbs = old bsp - size of dirty partition
+	cmp.ne p9,p0=r0,r0		// clear p9 to skip restore of cr.ifs
+	;;
+	sub r19=r19,r16			// calculate total byte size of dirty partition
+	add r18=64,r18			// don't force in0-in7 into memory...
+	;;
+	shl r19=r19,16			// shift size of dirty partition into loadrs position
+	;;
+dont_preserve_current_frame:
+	/*
+	 * To prevent leaking bits between the kernel and user-space,
+	 * we must clear the stacked registers in the "invalid" partition here.
+	 * Not pretty, but at least it's fast (3.34 registers/cycle on Itanium,
+	 * 5 registers/cycle on McKinley).
+	 */
+#	define pRecurse	p6
+#	define pReturn	p7
+#ifdef CONFIG_ITANIUM
+#	define Nregs	10
+#else
+#	define Nregs	14
+#endif
+	alloc loc0=ar.pfs,2,Nregs-2,2,0
+	shr.u loc1=r18,9		// RNaTslots <= floor(dirtySize / (64*8))
+	sub r17=r17,r18			// r17 = (physStackedSize + 8) - dirtySize
+	;;
+	mov ar.rsc=r19			// load ar.rsc to be used for "loadrs"
+	shladd in0=loc1,3,r17
+	mov in1=0
+	;;
+	TEXT_ALIGN(32)
+rse_clear_invalid:
+#ifdef CONFIG_ITANIUM
+	// cycle 0
+ { .mii
+	alloc loc0=ar.pfs,2,Nregs-2,2,0
+	cmp.lt pRecurse,p0=Nregs*8,in0	// if more than Nregs regs left to clear, (re)curse
+	add out0=-Nregs*8,in0
+}{ .mfb
+	add out1=1,in1			// increment recursion count
+	nop.f 0
+	nop.b 0				// can't do br.call here because of alloc (WAW on CFM)
+	;;
+}{ .mfi	// cycle 1
+	mov loc1=0
+	nop.f 0
+	mov loc2=0
+}{ .mib
+	mov loc3=0
+	mov loc4=0
+(pRecurse) br.call.sptk.many b0=rse_clear_invalid
+
+}{ .mfi	// cycle 2
+	mov loc5=0
+	nop.f 0
+	cmp.ne pReturn,p0=r0,in1	// if recursion count != 0, we need to do a br.ret
+}{ .mib
+	mov loc6=0
+	mov loc7=0
+(pReturn) br.ret.sptk.many b0
+}
+#else /* !CONFIG_ITANIUM */
+	alloc loc0=ar.pfs,2,Nregs-2,2,0
+	cmp.lt pRecurse,p0=Nregs*8,in0	// if more than Nregs regs left to clear, (re)curse
+	add out0=-Nregs*8,in0
+	add out1=1,in1			// increment recursion count
+	mov loc1=0
+	mov loc2=0
+	;;
+	mov loc3=0
+	mov loc4=0
+	mov loc5=0
+	mov loc6=0
+	mov loc7=0
+(pRecurse) br.call.dptk.few b0=rse_clear_invalid
+	;;
+	mov loc8=0
+	mov loc9=0
+	cmp.ne pReturn,p0=r0,in1	// if recursion count != 0, we need to do a br.ret
+	mov loc10=0
+	mov loc11=0
+(pReturn) br.ret.dptk.many b0
+#endif /* !CONFIG_ITANIUM */
+#	undef pRecurse
+#	undef pReturn
+	;;
+	alloc r17=ar.pfs,0,0,0,0	// drop current register frame
+	;;
+	loadrs
+	;;
+skip_rbs_switch:
+	mov ar.unat=r25		// M2
+(pKStk)	extr.u r22=r22,21,1	// I0 extract current value of psr.pp from r22
+(pLvSys)mov r19=r0		// A  clear r19 for leave_syscall, no-op otherwise
+	;;
+(pUStk)	mov ar.bspstore=r23	// M2
+(pKStk)	dep r29=r22,r29,21,1	// I0 update ipsr.pp with psr.pp
+(pLvSys)mov r16=r0		// A  clear r16 for leave_syscall, no-op otherwise
+	;;
+	MOV_TO_IPSR(p0, r29, r25)	// M2
+	mov ar.pfs=r26		// I0
+(pLvSys)mov r17=r0		// A  clear r17 for leave_syscall, no-op otherwise
+
+	MOV_TO_IFS(p9, r30, r25)// M2
+	mov b0=r21		// I0
+(pLvSys)mov r18=r0		// A  clear r18 for leave_syscall, no-op otherwise
+
+	mov ar.fpsr=r20		// M2
+	MOV_TO_IIP(r28, r25)	// M2
+	nop 0
+	;;
+(pUStk)	mov ar.rnat=r24		// M2 must happen with RSE in lazy mode
+	nop 0
+(pLvSys)mov r2=r0
+
+	mov ar.rsc=r27		// M2
+	mov pr=r31,-1		// I0
+	RFI			// B
+
+	/*
+	 * On entry:
+	 *	r20 = &current->thread_info->pre_count (if CONFIG_PREEMPTION)
+	 *	r31 = current->thread_info->flags
+	 * On exit:
+	 *	p6 = TRUE if work-pending-check needs to be redone
+	 *
+	 * Interrupts are disabled on entry, reenabled depend on work, and
+	 * disabled on exit.
+	 */
+.work_pending_syscall:
+	add r2=-8,r2
+	add r3=-8,r3
+	;;
+	st8 [r2]=r8
+	st8 [r3]=r10
+.work_pending:
+	tbit.z p6,p0=r31,TIF_NEED_RESCHED	// is resched not needed?
+(p6)	br.cond.sptk.few .notify
+	br.call.spnt.many rp=preempt_schedule_irq
+.ret9:	cmp.eq p6,p0=r0,r0	// p6 <- 1 (re-check)
+(pLvSys)br.cond.sptk.few  ia64_work_pending_syscall_end
+	br.cond.sptk.many .work_processed_kernel
+
+.notify:
+(pUStk)	br.call.spnt.many rp=notify_resume_user
+.ret10:	cmp.ne p6,p0=r0,r0	// p6 <- 0 (don't re-check)
+(pLvSys)br.cond.sptk.few  ia64_work_pending_syscall_end
+	br.cond.sptk.many .work_processed_kernel
+
+.global ia64_work_pending_syscall_end;
+ia64_work_pending_syscall_end:
+	adds r2=PT(R8)+16,r12
+	adds r3=PT(R10)+16,r12
+	;;
+	ld8 r8=[r2]
+	ld8 r10=[r3]
+	br.cond.sptk.many ia64_work_processed_syscall
+END(ia64_leave_kernel)
+
+ENTRY(handle_syscall_error)
+	/*
+	 * Some system calls (e.g., ptrace, mmap) can return arbitrary values which could
+	 * lead us to mistake a negative return value as a failed syscall.  Those syscall
+	 * must deposit a non-zero value in pt_regs.r8 to indicate an error.  If
+	 * pt_regs.r8 is zero, we assume that the call completed successfully.
+	 */
+	PT_REGS_UNWIND_INFO(0)
+	ld8 r3=[r2]		// load pt_regs.r8
+	;;
+	cmp.eq p6,p7=r3,r0	// is pt_regs.r8==0?
+	;;
+(p7)	mov r10=-1
+(p7)	sub r8=0,r8		// negate return value to get errno
+	br.cond.sptk ia64_leave_syscall
+END(handle_syscall_error)
+
+	/*
+	 * Invoke schedule_tail(task) while preserving in0-in7, which may be needed
+	 * in case a system call gets restarted.
+	 */
+GLOBAL_ENTRY(ia64_invoke_schedule_tail)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
+	alloc loc1=ar.pfs,8,2,1,0
+	mov loc0=rp
+	mov out0=r8				// Address of previous task
+	;;
+	br.call.sptk.many rp=schedule_tail
+.ret11:	mov ar.pfs=loc1
+	mov rp=loc0
+	br.ret.sptk.many rp
+END(ia64_invoke_schedule_tail)
+
+	/*
+	 * Setup stack and call do_notify_resume_user(), keeping interrupts
+	 * disabled.
+	 *
+	 * Note that pSys and pNonSys need to be set up by the caller.
+	 * We declare 8 input registers so the system call args get preserved,
+	 * in case we need to restart a system call.
+	 */
+GLOBAL_ENTRY(notify_resume_user)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
+	alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
+	mov r9=ar.unat
+	mov loc0=rp				// save return address
+	mov out0=0				// there is no "oldset"
+	adds out1=8,sp				// out1=&sigscratch->ar_pfs
+(pSys)	mov out2=1				// out2==1 => we're in a syscall
+	;;
+(pNonSys) mov out2=0				// out2==0 => not a syscall
+	.fframe 16
+	.spillsp ar.unat, 16
+	st8 [sp]=r9,-16				// allocate space for ar.unat and save it
+	st8 [out1]=loc1,-8			// save ar.pfs, out1=&sigscratch
+	.body
+	br.call.sptk.many rp=do_notify_resume_user
+.ret15:	.restore sp
+	adds sp=16,sp				// pop scratch stack space
+	;;
+	ld8 r9=[sp]				// load new unat from sigscratch->scratch_unat
+	mov rp=loc0
+	;;
+	mov ar.unat=r9
+	mov ar.pfs=loc1
+	br.ret.sptk.many rp
+END(notify_resume_user)
+
+ENTRY(sys_rt_sigreturn)
+	PT_REGS_UNWIND_INFO(0)
+	/*
+	 * Allocate 8 input registers since ptrace() may clobber them
+	 */
+	alloc r2=ar.pfs,8,0,1,0
+	.prologue
+	PT_REGS_SAVES(16)
+	adds sp=-16,sp
+	.body
+	cmp.eq pNonSys,pSys=r0,r0		// sigreturn isn't a normal syscall...
+	;;
+	/*
+	 * leave_kernel() restores f6-f11 from pt_regs, but since the streamlined
+	 * syscall-entry path does not save them we save them here instead.  Note: we
+	 * don't need to save any other registers that are not saved by the stream-lined
+	 * syscall path, because restore_sigcontext() restores them.
+	 */
+	adds r16=PT(F6)+32,sp
+	adds r17=PT(F7)+32,sp
+	;;
+ 	stf.spill [r16]=f6,32
+ 	stf.spill [r17]=f7,32
+	;;
+ 	stf.spill [r16]=f8,32
+ 	stf.spill [r17]=f9,32
+	;;
+ 	stf.spill [r16]=f10
+ 	stf.spill [r17]=f11
+	adds out0=16,sp				// out0 = &sigscratch
+	br.call.sptk.many rp=ia64_rt_sigreturn
+.ret19:	.restore sp,0
+	adds sp=16,sp
+	;;
+	ld8 r9=[sp]				// load new ar.unat
+	mov.sptk b7=r8,ia64_leave_kernel
+	;;
+	mov ar.unat=r9
+	br.many b7
+END(sys_rt_sigreturn)
+
+GLOBAL_ENTRY(ia64_prepare_handle_unaligned)
+	.prologue
+	/*
+	 * r16 = fake ar.pfs, we simply need to make sure privilege is still 0
+	 */
+	mov r16=r0
+	DO_SAVE_SWITCH_STACK
+	br.call.sptk.many rp=ia64_handle_unaligned	// stack frame setup in ivt
+.ret21:	.body
+	DO_LOAD_SWITCH_STACK
+	br.cond.sptk.many rp				// goes to ia64_leave_kernel
+END(ia64_prepare_handle_unaligned)
+
+	//
+	// unw_init_running(void (*callback)(info, arg), void *arg)
+	//
+#	define EXTRA_FRAME_SIZE	((UNW_FRAME_INFO_SIZE+15)&~15)
+
+GLOBAL_ENTRY(unw_init_running)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
+	alloc loc1=ar.pfs,2,3,3,0
+	;;
+	ld8 loc2=[in0],8
+	mov loc0=rp
+	mov r16=loc1
+	DO_SAVE_SWITCH_STACK
+	.body
+
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
+	.fframe IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE
+	SWITCH_STACK_SAVES(EXTRA_FRAME_SIZE)
+	adds sp=-EXTRA_FRAME_SIZE,sp
+	.body
+	;;
+	adds out0=16,sp				// &info
+	mov out1=r13				// current
+	adds out2=16+EXTRA_FRAME_SIZE,sp	// &switch_stack
+	br.call.sptk.many rp=unw_init_frame_info
+1:	adds out0=16,sp				// &info
+	mov b6=loc2
+	mov loc2=gp				// save gp across indirect function call
+	;;
+	ld8 gp=[in0]
+	mov out1=in1				// arg
+	br.call.sptk.many rp=b6			// invoke the callback function
+1:	mov gp=loc2				// restore gp
+
+	// For now, we don't allow changing registers from within
+	// unw_init_running; if we ever want to allow that, we'd
+	// have to do a load_switch_stack here:
+	.restore sp
+	adds sp=IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE,sp
+
+	mov ar.pfs=loc1
+	mov rp=loc0
+	br.ret.sptk.many rp
+END(unw_init_running)
+EXPORT_SYMBOL(unw_init_running)
+
+#ifdef CONFIG_FUNCTION_TRACER
+#ifdef CONFIG_DYNAMIC_FTRACE
+GLOBAL_ENTRY(_mcount)
+	br ftrace_stub
+END(_mcount)
+EXPORT_SYMBOL(_mcount)
+
+.here:
+	br.ret.sptk.many b0
+
+GLOBAL_ENTRY(ftrace_caller)
+	alloc out0 = ar.pfs, 8, 0, 4, 0
+	mov out3 = r0
+	;;
+	mov out2 = b0
+	add r3 = 0x20, r3
+	mov out1 = r1;
+	br.call.sptk.many b0 = ftrace_patch_gp
+	//this might be called from module, so we must patch gp
+ftrace_patch_gp:
+	movl gp=__gp
+	mov b0 = r3
+	;;
+.global ftrace_call;
+ftrace_call:
+{
+	.mlx
+	nop.m 0x0
+	movl r3 = .here;;
+}
+	alloc loc0 = ar.pfs, 4, 4, 2, 0
+	;;
+	mov loc1 = b0
+	mov out0 = b0
+	mov loc2 = r8
+	mov loc3 = r15
+	;;
+	adds out0 = -MCOUNT_INSN_SIZE, out0
+	mov out1 = in2
+	mov b6 = r3
+
+	br.call.sptk.many b0 = b6
+	;;
+	mov ar.pfs = loc0
+	mov b0 = loc1
+	mov r8 = loc2
+	mov r15 = loc3
+	br ftrace_stub
+	;;
+END(ftrace_caller)
+
+#else
+GLOBAL_ENTRY(_mcount)
+	movl r2 = ftrace_stub
+	movl r3 = ftrace_trace_function;;
+	ld8 r3 = [r3];;
+	ld8 r3 = [r3];;
+	cmp.eq p7,p0 = r2, r3
+(p7)	br.sptk.many ftrace_stub
+	;;
+
+	alloc loc0 = ar.pfs, 4, 4, 2, 0
+	;;
+	mov loc1 = b0
+	mov out0 = b0
+	mov loc2 = r8
+	mov loc3 = r15
+	;;
+	adds out0 = -MCOUNT_INSN_SIZE, out0
+	mov out1 = in2
+	mov b6 = r3
+
+	br.call.sptk.many b0 = b6
+	;;
+	mov ar.pfs = loc0
+	mov b0 = loc1
+	mov r8 = loc2
+	mov r15 = loc3
+	br ftrace_stub
+	;;
+END(_mcount)
+#endif
+
+GLOBAL_ENTRY(ftrace_stub)
+	mov r3 = b0
+	movl r2 = _mcount_ret_helper
+	;;
+	mov b6 = r2
+	mov b7 = r3
+	br.ret.sptk.many b6
+
+_mcount_ret_helper:
+	mov b0 = r42
+	mov r1 = r41
+	mov ar.pfs = r40
+	br b7
+END(ftrace_stub)
+
+#endif /* CONFIG_FUNCTION_TRACER */
+
+#define __SYSCALL(nr, entry) data8 entry
+	.rodata
+	.align 8
+	.globl sys_call_table
+sys_call_table:
+#include <asm/syscall_table.h>
diff --git a/arch/ia64/kernel/entry.h b/arch/ia64/kernel/entry.h
new file mode 100644
index 000000000..6463dc316
--- /dev/null
+++ b/arch/ia64/kernel/entry.h
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Preserved registers that are shared between code in ivt.S and
+ * entry.S.  Be careful not to step on these!
+ */
+#define PRED_LEAVE_SYSCALL	1 /* TRUE iff leave from syscall */
+#define PRED_KERNEL_STACK	2 /* returning to kernel-stacks? */
+#define PRED_USER_STACK		3 /* returning to user-stacks? */
+#define PRED_SYSCALL		4 /* inside a system call? */
+#define PRED_NON_SYSCALL	5 /* complement of PRED_SYSCALL */
+
+#ifdef __ASSEMBLY__
+# define PASTE2(x,y)	x##y
+# define PASTE(x,y)	PASTE2(x,y)
+
+# define pLvSys		PASTE(p,PRED_LEAVE_SYSCALL)
+# define pKStk		PASTE(p,PRED_KERNEL_STACK)
+# define pUStk		PASTE(p,PRED_USER_STACK)
+# define pSys		PASTE(p,PRED_SYSCALL)
+# define pNonSys	PASTE(p,PRED_NON_SYSCALL)
+#endif
+
+#define PT(f)		(IA64_PT_REGS_##f##_OFFSET)
+#define SW(f)		(IA64_SWITCH_STACK_##f##_OFFSET)
+#define SOS(f)		(IA64_SAL_OS_STATE_##f##_OFFSET)
+
+#define PT_REGS_SAVES(off)			\
+	.unwabi 3, 'i';				\
+	.fframe IA64_PT_REGS_SIZE+16+(off);	\
+	.spillsp rp, PT(CR_IIP)+16+(off);	\
+	.spillsp ar.pfs, PT(CR_IFS)+16+(off);	\
+	.spillsp ar.unat, PT(AR_UNAT)+16+(off);	\
+	.spillsp ar.fpsr, PT(AR_FPSR)+16+(off);	\
+	.spillsp pr, PT(PR)+16+(off);
+
+#define PT_REGS_UNWIND_INFO(off)		\
+	.prologue;				\
+	PT_REGS_SAVES(off);			\
+	.body
+
+#define SWITCH_STACK_SAVES(off)							\
+	.savesp ar.unat,SW(CALLER_UNAT)+16+(off);				\
+	.savesp ar.fpsr,SW(AR_FPSR)+16+(off);					\
+	.spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off);		\
+	.spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off);		\
+	.spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off);		\
+	.spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off);		\
+	.spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off);		\
+	.spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off);		\
+	.spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off);		\
+	.spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off);		\
+	.spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off);		\
+	.spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off);		\
+	.spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off);		\
+	.spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off);		\
+	.spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off);		\
+	.spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off);		\
+	.spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off);		\
+	.spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off);	\
+	.spillsp @priunat,SW(AR_UNAT)+16+(off);					\
+	.spillsp ar.rnat,SW(AR_RNAT)+16+(off);					\
+	.spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off);				\
+	.spillsp pr,SW(PR)+16+(off)
+
+#define DO_SAVE_SWITCH_STACK			\
+	movl r28=1f;				\
+	;;					\
+	.fframe IA64_SWITCH_STACK_SIZE;		\
+	adds sp=-IA64_SWITCH_STACK_SIZE,sp;	\
+	mov.ret.sptk b7=r28,1f;			\
+	SWITCH_STACK_SAVES(0);			\
+	br.cond.sptk.many save_switch_stack;	\
+1:
+
+#define DO_LOAD_SWITCH_STACK			\
+	movl r28=1f;				\
+	;;					\
+	invala;					\
+	mov.ret.sptk b7=r28,1f;			\
+	br.cond.sptk.many load_switch_stack;	\
+1:	.restore sp;				\
+	adds sp=IA64_SWITCH_STACK_SIZE,sp
diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c
new file mode 100644
index 000000000..dd5bfed52
--- /dev/null
+++ b/arch/ia64/kernel/err_inject.c
@@ -0,0 +1,273 @@
+/*
+ * err_inject.c -
+ *	1.) Inject errors to a processor.
+ *	2.) Query error injection capabilities.
+ * This driver along with user space code can be acting as an error
+ * injection tool.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
+ * Copyright (C) 2006, Intel Corp.  All rights reserved.
+ *
+ */
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+
+#define ERR_INJ_DEBUG
+
+#define ERR_DATA_BUFFER_SIZE 3 		// Three 8-byte;
+
+#define define_one_ro(name) 						\
+static DEVICE_ATTR(name, 0444, show_##name, NULL)
+
+#define define_one_rw(name) 						\
+static DEVICE_ATTR(name, 0644, show_##name, store_##name)
+
+static u64 call_start[NR_CPUS];
+static u64 phys_addr[NR_CPUS];
+static u64 err_type_info[NR_CPUS];
+static u64 err_struct_info[NR_CPUS];
+static struct {
+	u64 data1;
+	u64 data2;
+	u64 data3;
+} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
+static s64 status[NR_CPUS];
+static u64 capabilities[NR_CPUS];
+static u64 resources[NR_CPUS];
+
+#define show(name) 							\
+static ssize_t 								\
+show_##name(struct device *dev, struct device_attribute *attr,	\
+		char *buf)						\
+{									\
+	u32 cpu=dev->id;						\
+	return sprintf(buf, "%llx\n", name[cpu]);			\
+}
+
+#define store(name)							\
+static ssize_t 								\
+store_##name(struct device *dev, struct device_attribute *attr,	\
+					const char *buf, size_t size)	\
+{									\
+	unsigned int cpu=dev->id;					\
+	name[cpu] = simple_strtoull(buf, NULL, 16);			\
+	return size;							\
+}
+
+show(call_start)
+
+/* It's user's responsibility to call the PAL procedure on a specific
+ * processor. The cpu number in driver is only used for storing data.
+ */
+static ssize_t
+store_call_start(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	unsigned int cpu=dev->id;
+	unsigned long call_start = simple_strtoull(buf, NULL, 16);
+
+#ifdef ERR_INJ_DEBUG
+	printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu);
+	printk(KERN_DEBUG "err_type_info=%llx,\n", err_type_info[cpu]);
+	printk(KERN_DEBUG "err_struct_info=%llx,\n", err_struct_info[cpu]);
+	printk(KERN_DEBUG "err_data_buffer=%llx, %llx, %llx.\n",
+			  err_data_buffer[cpu].data1,
+			  err_data_buffer[cpu].data2,
+			  err_data_buffer[cpu].data3);
+#endif
+	switch (call_start) {
+	    case 0: /* Do nothing. */
+		break;
+	    case 1: /* Call pal_mc_error_inject in physical mode. */
+		status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu],
+					err_struct_info[cpu],
+					ia64_tpa(&err_data_buffer[cpu]),
+					&capabilities[cpu],
+			 		&resources[cpu]);
+		break;
+	    case 2: /* Call pal_mc_error_inject in virtual mode. */
+		status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu],
+					err_struct_info[cpu],
+					ia64_tpa(&err_data_buffer[cpu]),
+					&capabilities[cpu],
+			 		&resources[cpu]);
+		break;
+	    default:
+		status[cpu] = -EINVAL;
+		break;
+	}
+
+#ifdef ERR_INJ_DEBUG
+	printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]);
+	printk(KERN_DEBUG "capabilities=%llx,\n", capabilities[cpu]);
+	printk(KERN_DEBUG "resources=%llx\n", resources[cpu]);
+#endif
+	return size;
+}
+
+show(err_type_info)
+store(err_type_info)
+
+static ssize_t
+show_virtual_to_phys(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	unsigned int cpu=dev->id;
+	return sprintf(buf, "%llx\n", phys_addr[cpu]);
+}
+
+static ssize_t
+store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t size)
+{
+	unsigned int cpu=dev->id;
+	u64 virt_addr=simple_strtoull(buf, NULL, 16);
+	int ret;
+
+	ret = get_user_pages_fast(virt_addr, 1, FOLL_WRITE, NULL);
+	if (ret<=0) {
+#ifdef ERR_INJ_DEBUG
+		printk("Virtual address %llx is not existing.\n", virt_addr);
+#endif
+		return -EINVAL;
+	}
+
+	phys_addr[cpu] = ia64_tpa(virt_addr);
+	return size;
+}
+
+show(err_struct_info)
+store(err_struct_info)
+
+static ssize_t
+show_err_data_buffer(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	unsigned int cpu=dev->id;
+
+	return sprintf(buf, "%llx, %llx, %llx\n",
+			err_data_buffer[cpu].data1,
+			err_data_buffer[cpu].data2,
+			err_data_buffer[cpu].data3);
+}
+
+static ssize_t
+store_err_data_buffer(struct device *dev,
+			struct device_attribute *attr,
+			const char *buf, size_t size)
+{
+	unsigned int cpu=dev->id;
+	int ret;
+
+#ifdef ERR_INJ_DEBUG
+	printk("write err_data_buffer=[%llx,%llx,%llx] on cpu%d\n",
+		 err_data_buffer[cpu].data1,
+		 err_data_buffer[cpu].data2,
+		 err_data_buffer[cpu].data3,
+		 cpu);
+#endif
+	ret = sscanf(buf, "%llx, %llx, %llx",
+			&err_data_buffer[cpu].data1,
+			&err_data_buffer[cpu].data2,
+			&err_data_buffer[cpu].data3);
+	if (ret!=ERR_DATA_BUFFER_SIZE)
+		return -EINVAL;
+
+	return size;
+}
+
+show(status)
+show(capabilities)
+show(resources)
+
+define_one_rw(call_start);
+define_one_rw(err_type_info);
+define_one_rw(err_struct_info);
+define_one_rw(err_data_buffer);
+define_one_rw(virtual_to_phys);
+define_one_ro(status);
+define_one_ro(capabilities);
+define_one_ro(resources);
+
+static struct attribute *default_attrs[] = {
+	&dev_attr_call_start.attr,
+	&dev_attr_virtual_to_phys.attr,
+	&dev_attr_err_type_info.attr,
+	&dev_attr_err_struct_info.attr,
+	&dev_attr_err_data_buffer.attr,
+	&dev_attr_status.attr,
+	&dev_attr_capabilities.attr,
+	&dev_attr_resources.attr,
+	NULL
+};
+
+static struct attribute_group err_inject_attr_group = {
+	.attrs = default_attrs,
+	.name = "err_inject"
+};
+/* Add/Remove err_inject interface for CPU device */
+static int err_inject_add_dev(unsigned int cpu)
+{
+	struct device *sys_dev = get_cpu_device(cpu);
+
+	return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
+}
+
+static int err_inject_remove_dev(unsigned int cpu)
+{
+	struct device *sys_dev = get_cpu_device(cpu);
+
+	sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
+	return 0;
+}
+
+static enum cpuhp_state hp_online;
+
+static int __init err_inject_init(void)
+{
+	int ret;
+#ifdef ERR_INJ_DEBUG
+	printk(KERN_INFO "Enter error injection driver.\n");
+#endif
+
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/err_inj:online",
+				err_inject_add_dev, err_inject_remove_dev);
+	if (ret >= 0) {
+		hp_online = ret;
+		ret = 0;
+	}
+	return ret;
+}
+
+static void __exit err_inject_exit(void)
+{
+#ifdef ERR_INJ_DEBUG
+	printk(KERN_INFO "Exit error injection driver.\n");
+#endif
+	cpuhp_remove_state(hp_online);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
+MODULE_DESCRIPTION("MC error injection kernel sysfs interface");
+MODULE_LICENSE("GPL");
diff --git a/arch/ia64/kernel/esi.c b/arch/ia64/kernel/esi.c
new file mode 100644
index 000000000..4df57c93e
--- /dev/null
+++ b/arch/ia64/kernel/esi.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Extensible SAL Interface (ESI) support routines.
+ *
+ * Copyright (C) 2006 Hewlett-Packard Co
+ * 	Alex Williamson <alex.williamson@hp.com>
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <asm/esi.h>
+#include <asm/sal.h>
+
+MODULE_AUTHOR("Alex Williamson <alex.williamson@hp.com>");
+MODULE_DESCRIPTION("Extensible SAL Interface (ESI) support");
+MODULE_LICENSE("GPL");
+
+#define MODULE_NAME	"esi"
+
+enum esi_systab_entry_type {
+	ESI_DESC_ENTRY_POINT = 0
+};
+
+/*
+ * Entry type:	Size:
+ *	0	48
+ */
+#define ESI_DESC_SIZE(type)	"\060"[(unsigned) (type)]
+
+typedef struct ia64_esi_desc_entry_point {
+	u8 type;
+	u8 reserved1[15];
+	u64 esi_proc;
+	u64 gp;
+	efi_guid_t guid;
+} ia64_esi_desc_entry_point_t;
+
+struct pdesc {
+	void *addr;
+	void *gp;
+};
+
+static struct ia64_sal_systab *esi_systab;
+
+extern unsigned long esi_phys;
+
+static int __init esi_init (void)
+{
+	struct ia64_sal_systab *systab;
+	char *p;
+	int i;
+
+	if (esi_phys == EFI_INVALID_TABLE_ADDR)
+		return -ENODEV;
+
+	systab = __va(esi_phys);
+
+	if (strncmp(systab->signature, "ESIT", 4) != 0) {
+		printk(KERN_ERR "bad signature in ESI system table!");
+		return -ENODEV;
+	}
+
+	p = (char *) (systab + 1);
+	for (i = 0; i < systab->entry_count; i++) {
+		/*
+		 * The first byte of each entry type contains the type
+		 * descriptor.
+		 */
+		switch (*p) {
+		      case ESI_DESC_ENTRY_POINT:
+			break;
+		      default:
+			printk(KERN_WARNING "Unknown table type %d found in "
+			       "ESI table, ignoring rest of table\n", *p);
+			return -ENODEV;
+		}
+
+		p += ESI_DESC_SIZE(*p);
+	}
+
+	esi_systab = systab;
+	return 0;
+}
+
+
+int ia64_esi_call (efi_guid_t guid, struct ia64_sal_retval *isrvp,
+		   enum esi_proc_type proc_type, u64 func,
+		   u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
+		   u64 arg7)
+{
+	struct ia64_fpreg fr[6];
+	unsigned long flags = 0;
+	int i;
+	char *p;
+
+	if (!esi_systab)
+		return -1;
+
+	p = (char *) (esi_systab + 1);
+	for (i = 0; i < esi_systab->entry_count; i++) {
+		if (*p == ESI_DESC_ENTRY_POINT) {
+			ia64_esi_desc_entry_point_t *esi = (void *)p;
+			if (!efi_guidcmp(guid, esi->guid)) {
+				ia64_sal_handler esi_proc;
+				struct pdesc pdesc;
+
+				pdesc.addr = __va(esi->esi_proc);
+				pdesc.gp = __va(esi->gp);
+
+				esi_proc = (ia64_sal_handler) &pdesc;
+
+				ia64_save_scratch_fpregs(fr);
+				if (proc_type == ESI_PROC_SERIALIZED)
+					spin_lock_irqsave(&sal_lock, flags);
+				else if (proc_type == ESI_PROC_MP_SAFE)
+					local_irq_save(flags);
+				else
+					preempt_disable();
+				*isrvp = (*esi_proc)(func, arg1, arg2, arg3,
+						     arg4, arg5, arg6, arg7);
+				if (proc_type == ESI_PROC_SERIALIZED)
+					spin_unlock_irqrestore(&sal_lock,
+							       flags);
+				else if (proc_type == ESI_PROC_MP_SAFE)
+					local_irq_restore(flags);
+				else
+					preempt_enable();
+				ia64_load_scratch_fpregs(fr);
+				return 0;
+			}
+		}
+		p += ESI_DESC_SIZE(*p);
+	}
+	return -1;
+}
+EXPORT_SYMBOL_GPL(ia64_esi_call);
+
+int ia64_esi_call_phys (efi_guid_t guid, struct ia64_sal_retval *isrvp,
+			u64 func, u64 arg1, u64 arg2, u64 arg3, u64 arg4,
+			u64 arg5, u64 arg6, u64 arg7)
+{
+	struct ia64_fpreg fr[6];
+	unsigned long flags;
+	u64 esi_params[8];
+	char *p;
+	int i;
+
+	if (!esi_systab)
+		return -1;
+
+	p = (char *) (esi_systab + 1);
+	for (i = 0; i < esi_systab->entry_count; i++) {
+		if (*p == ESI_DESC_ENTRY_POINT) {
+			ia64_esi_desc_entry_point_t *esi = (void *)p;
+			if (!efi_guidcmp(guid, esi->guid)) {
+				ia64_sal_handler esi_proc;
+				struct pdesc pdesc;
+
+				pdesc.addr = (void *)esi->esi_proc;
+				pdesc.gp = (void *)esi->gp;
+
+				esi_proc = (ia64_sal_handler) &pdesc;
+
+				esi_params[0] = func;
+				esi_params[1] = arg1;
+				esi_params[2] = arg2;
+				esi_params[3] = arg3;
+				esi_params[4] = arg4;
+				esi_params[5] = arg5;
+				esi_params[6] = arg6;
+				esi_params[7] = arg7;
+				ia64_save_scratch_fpregs(fr);
+				spin_lock_irqsave(&sal_lock, flags);
+				*isrvp = esi_call_phys(esi_proc, esi_params);
+				spin_unlock_irqrestore(&sal_lock, flags);
+				ia64_load_scratch_fpregs(fr);
+				return 0;
+			}
+		}
+		p += ESI_DESC_SIZE(*p);
+	}
+	return -1;
+}
+EXPORT_SYMBOL_GPL(ia64_esi_call_phys);
+
+static void __exit esi_exit (void)
+{
+}
+
+module_init(esi_init);
+module_exit(esi_exit);	/* makes module removable... */
diff --git a/arch/ia64/kernel/esi_stub.S b/arch/ia64/kernel/esi_stub.S
new file mode 100644
index 000000000..821e68d10
--- /dev/null
+++ b/arch/ia64/kernel/esi_stub.S
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * ESI call stub.
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *	Alex Williamson <alex.williamson@hp.com>
+ *
+ * Based on EFI call stub by David Mosberger.  The stub is virtually
+ * identical to the one for EFI phys-mode calls, except that ESI
+ * calls may have up to 8 arguments, so they get passed to this routine
+ * through memory.
+ *
+ * This stub allows us to make ESI calls in physical mode with interrupts
+ * turned off.  ESI calls may not support calling from virtual mode.
+ *
+ * Google for "Extensible SAL specification" for a document describing the
+ * ESI standard.
+ */
+
+/*
+ * PSR settings as per SAL spec (Chapter 8 in the "IA-64 System
+ * Abstraction Layer Specification", revision 2.6e).  Note that
+ * psr.dfl and psr.dfh MUST be cleared, despite what this manual says.
+ * Otherwise, SAL dies whenever it's trying to do an IA-32 BIOS call
+ * (the br.ia instruction fails unless psr.dfl and psr.dfh are
+ * cleared).  Fortunately, SAL promises not to touch the floating
+ * point regs, so at least we don't have to save f2-f127.
+ */
+#define PSR_BITS_TO_CLEAR						\
+	(IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_RT |		\
+	 IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED |	\
+	 IA64_PSR_DFL | IA64_PSR_DFH)
+
+#define PSR_BITS_TO_SET							\
+	(IA64_PSR_BN)
+
+#include <asm/processor.h>
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+
+/*
+ * Inputs:
+ *	in0 = address of function descriptor of ESI routine to call
+ *	in1 = address of array of ESI parameters
+ *
+ * Outputs:
+ *	r8 = result returned by called function
+ */
+GLOBAL_ENTRY(esi_call_phys)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
+	alloc loc1=ar.pfs,2,7,8,0
+	ld8 r2=[in0],8			// load ESI function's entry point
+	mov loc0=rp
+	.body
+	;;
+	ld8 out0=[in1],8		// ESI params loaded from array
+	;;				// passing all as inputs doesn't work
+	ld8 out1=[in1],8
+	;;
+	ld8 out2=[in1],8
+	;;
+	ld8 out3=[in1],8
+	;;
+	ld8 out4=[in1],8
+	;;
+	ld8 out5=[in1],8
+	;;
+	ld8 out6=[in1],8
+	;;
+	ld8 out7=[in1]
+	mov loc2=gp			// save global pointer
+	mov loc4=ar.rsc			// save RSE configuration
+	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	;;
+	ld8 gp=[in0]			// load ESI function's global pointer
+	movl r16=PSR_BITS_TO_CLEAR
+	mov loc3=psr			// save processor status word
+	movl r17=PSR_BITS_TO_SET
+	;;
+	or loc3=loc3,r17
+	mov b6=r2
+	;;
+	andcm r16=loc3,r16	// get psr with IT, DT, and RT bits cleared
+	br.call.sptk.many rp=ia64_switch_mode_phys
+.ret0:	mov loc5=r19			// old ar.bsp
+	mov loc6=r20			// old sp
+	br.call.sptk.many rp=b6		// call the ESI function
+.ret1:	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	mov r16=loc3			// save virtual mode psr
+	mov r19=loc5			// save virtual mode bspstore
+	mov r20=loc6			// save virtual mode sp
+	br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
+.ret2:	mov ar.rsc=loc4			// restore RSE configuration
+	mov ar.pfs=loc1
+	mov rp=loc0
+	mov gp=loc2
+	br.ret.sptk.many rp
+END(esi_call_phys)
+EXPORT_SYMBOL_GPL(esi_call_phys)
diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
new file mode 100644
index 000000000..2094f3249
--- /dev/null
+++ b/arch/ia64/kernel/fsys.S
@@ -0,0 +1,837 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This file contains the light-weight system call handlers (fsyscall-handlers).
+ *
+ * Copyright (C) 2003 Hewlett-Packard Co
+ * 	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * 25-Sep-03 davidm	Implement fsys_rt_sigprocmask().
+ * 18-Feb-03 louisk	Implement fsys_gettimeofday().
+ * 28-Feb-03 davidm	Fixed several bugs in fsys_gettimeofday().  Tuned it some more,
+ *			probably broke it along the way... ;-)
+ * 13-Jul-04 clameter   Implement fsys_clock_gettime and revise fsys_gettimeofday to make
+ *                      it capable of using memory based clocks without falling back to C code.
+ * 08-Feb-07 Fenghua Yu Implement fsys_getcpu.
+ *
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/errno.h>
+#include <asm/asm-offsets.h>
+#include <asm/percpu.h>
+#include <asm/thread_info.h>
+#include <asm/sal.h>
+#include <asm/signal.h>
+#include <asm/unistd.h>
+
+#include "entry.h"
+#include <asm/native/inst.h>
+
+/*
+ * See Documentation/ia64/fsys.rst for details on fsyscalls.
+ *
+ * On entry to an fsyscall handler:
+ *   r10	= 0 (i.e., defaults to "successful syscall return")
+ *   r11	= saved ar.pfs (a user-level value)
+ *   r15	= system call number
+ *   r16	= "current" task pointer (in normal kernel-mode, this is in r13)
+ *   r32-r39	= system call arguments
+ *   b6		= return address (a user-level value)
+ *   ar.pfs	= previous frame-state (a user-level value)
+ *   PSR.be	= cleared to zero (i.e., little-endian byte order is in effect)
+ *   all other registers may contain values passed in from user-mode
+ *
+ * On return from an fsyscall handler:
+ *   r11	= saved ar.pfs (as passed into the fsyscall handler)
+ *   r15	= system call number (as passed into the fsyscall handler)
+ *   r32-r39	= system call arguments (as passed into the fsyscall handler)
+ *   b6		= return address (as passed into the fsyscall handler)
+ *   ar.pfs	= previous frame-state (as passed into the fsyscall handler)
+ */
+
+ENTRY(fsys_ni_syscall)
+	.prologue
+	.altrp b6
+	.body
+	mov r8=ENOSYS
+	mov r10=-1
+	FSYS_RETURN
+END(fsys_ni_syscall)
+
+ENTRY(fsys_getpid)
+	.prologue
+	.altrp b6
+	.body
+	add r17=IA64_TASK_SIGNAL_OFFSET,r16
+	;;
+	ld8 r17=[r17]				// r17 = current->signal
+	add r9=TI_FLAGS+IA64_TASK_SIZE,r16
+	;;
+	ld4 r9=[r9]
+	add r17=IA64_SIGNAL_PIDS_TGID_OFFSET,r17
+	;;
+	and r9=TIF_ALLWORK_MASK,r9
+	ld8 r17=[r17]				// r17 = current->signal->pids[PIDTYPE_TGID]
+	;;
+	add r8=IA64_PID_LEVEL_OFFSET,r17
+	;;
+	ld4 r8=[r8]				// r8 = pid->level
+	add r17=IA64_PID_UPID_OFFSET,r17	// r17 = &pid->numbers[0]
+	;;
+	shl r8=r8,IA64_UPID_SHIFT
+	;;
+	add r17=r17,r8				// r17 = &pid->numbers[pid->level]
+	;;
+	ld4 r8=[r17]				// r8 = pid->numbers[pid->level].nr
+	;;
+	mov r17=0
+	;;
+	cmp.ne p8,p0=0,r9
+(p8)	br.spnt.many fsys_fallback_syscall
+	FSYS_RETURN
+END(fsys_getpid)
+
+ENTRY(fsys_set_tid_address)
+	.prologue
+	.altrp b6
+	.body
+	add r9=TI_FLAGS+IA64_TASK_SIZE,r16
+	add r17=IA64_TASK_THREAD_PID_OFFSET,r16
+	;;
+	ld4 r9=[r9]
+	tnat.z p6,p7=r32		// check argument register for being NaT
+	ld8 r17=[r17]				// r17 = current->thread_pid
+	;;
+	and r9=TIF_ALLWORK_MASK,r9
+	add r8=IA64_PID_LEVEL_OFFSET,r17
+	add r18=IA64_TASK_CLEAR_CHILD_TID_OFFSET,r16
+	;;
+	ld4 r8=[r8]				// r8 = pid->level
+	add r17=IA64_PID_UPID_OFFSET,r17	// r17 = &pid->numbers[0]
+	;;
+	shl r8=r8,IA64_UPID_SHIFT
+	;;
+	add r17=r17,r8				// r17 = &pid->numbers[pid->level]
+	;;
+	ld4 r8=[r17]				// r8 = pid->numbers[pid->level].nr
+	;;
+	cmp.ne p8,p0=0,r9
+	mov r17=-1
+	;;
+(p6)	st8 [r18]=r32
+(p7)	st8 [r18]=r17
+(p8)	br.spnt.many fsys_fallback_syscall
+	;;
+	mov r17=0			// i must not leak kernel bits...
+	mov r18=0			// i must not leak kernel bits...
+	FSYS_RETURN
+END(fsys_set_tid_address)
+
+#if IA64_GTOD_SEQ_OFFSET !=0
+#error fsys_gettimeofday incompatible with changes to struct fsyscall_gtod_data_t
+#endif
+#if IA64_ITC_JITTER_OFFSET !=0
+#error fsys_gettimeofday incompatible with changes to struct itc_jitter_data_t
+#endif
+#define CLOCK_REALTIME 0
+#define CLOCK_MONOTONIC 1
+#define CLOCK_DIVIDE_BY_1000 0x4000
+#define CLOCK_ADD_MONOTONIC 0x8000
+
+ENTRY(fsys_gettimeofday)
+	.prologue
+	.altrp b6
+	.body
+	mov r31 = r32
+	tnat.nz p6,p0 = r33		// guard against NaT argument
+(p6)    br.cond.spnt.few .fail_einval
+	mov r30 = CLOCK_DIVIDE_BY_1000
+	;;
+.gettime:
+	// Register map
+	// Incoming r31 = pointer to address where to place result
+	//          r30 = flags determining how time is processed
+	// r2,r3 = temp r4-r7 preserved
+	// r8 = result nanoseconds
+	// r9 = result seconds
+	// r10 = temporary storage for clock difference
+	// r11 = preserved: saved ar.pfs
+	// r12 = preserved: memory stack
+	// r13 = preserved: thread pointer
+	// r14 = address of mask / mask value
+	// r15 = preserved: system call number
+	// r16 = preserved: current task pointer
+	// r17 = (not used)
+	// r18 = (not used)
+	// r19 = address of itc_lastcycle
+	// r20 = struct fsyscall_gtod_data (= address of gtod_lock.sequence)
+	// r21 = address of mmio_ptr
+	// r22 = address of wall_time or monotonic_time
+	// r23 = address of shift / value
+	// r24 = address mult factor / cycle_last value
+	// r25 = itc_lastcycle value
+	// r26 = address clocksource cycle_last
+	// r27 = (not used)
+	// r28 = sequence number at the beginning of critical section
+	// r29 = address of itc_jitter
+	// r30 = time processing flags / memory address
+	// r31 = pointer to result
+	// Predicates
+	// p6,p7 short term use
+	// p8 = timesource ar.itc
+	// p9 = timesource mmio64
+	// p10 = timesource mmio32 - not used
+	// p11 = timesource not to be handled by asm code
+	// p12 = memory time source ( = p9 | p10) - not used
+	// p13 = do cmpxchg with itc_lastcycle
+	// p14 = Divide by 1000
+	// p15 = Add monotonic
+	//
+	// Note that instructions are optimized for McKinley. McKinley can
+	// process two bundles simultaneously and therefore we continuously
+	// try to feed the CPU two bundles and then a stop.
+
+	add r2 = TI_FLAGS+IA64_TASK_SIZE,r16
+	tnat.nz p6,p0 = r31		// guard against Nat argument
+(p6)	br.cond.spnt.few .fail_einval
+	movl r20 = fsyscall_gtod_data // load fsyscall gettimeofday data address
+	;;
+	ld4 r2 = [r2]			// process work pending flags
+	movl r29 = itc_jitter_data	// itc_jitter
+	add r22 = IA64_GTOD_WALL_TIME_OFFSET,r20	// wall_time
+	add r21 = IA64_CLKSRC_MMIO_OFFSET,r20
+	mov pr = r30,0xc000	// Set predicates according to function
+	;;
+	and r2 = TIF_ALLWORK_MASK,r2
+	add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29
+(p15)	add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20	// monotonic_time
+	;;
+	add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20	// clksrc_cycle_last
+	cmp.ne p6, p0 = 0, r2	// Fallback if work is scheduled
+(p6)	br.cond.spnt.many fsys_fallback_syscall
+	;;
+	// Begin critical section
+.time_redo:
+	ld4.acq r28 = [r20]	// gtod_lock.sequence, Must take first
+	;;
+	and r28 = ~1,r28	// And make sequence even to force retry if odd
+	;;
+	ld8 r30 = [r21]		// clocksource->mmio_ptr
+	add r24 = IA64_CLKSRC_MULT_OFFSET,r20
+	ld4 r2 = [r29]		// itc_jitter value
+	add r23 = IA64_CLKSRC_SHIFT_OFFSET,r20
+	add r14 = IA64_CLKSRC_MASK_OFFSET,r20
+	;;
+	ld4 r3 = [r24]		// clocksource mult value
+	ld8 r14 = [r14]         // clocksource mask value
+	cmp.eq p8,p9 = 0,r30	// use cpu timer if no mmio_ptr
+	;;
+	setf.sig f7 = r3	// Setup for mult scaling of counter
+(p8)	cmp.ne p13,p0 = r2,r0	// need itc_jitter compensation, set p13
+	ld4 r23 = [r23]		// clocksource shift value
+	ld8 r24 = [r26]		// get clksrc_cycle_last value
+(p9)	cmp.eq p13,p0 = 0,r30	// if mmio_ptr, clear p13 jitter control
+	;;
+	.pred.rel.mutex p8,p9
+	MOV_FROM_ITC(p8, p6, r2, r10)	// CPU_TIMER. 36 clocks latency!!!
+(p9)	ld8 r2 = [r30]		// MMIO_TIMER. Could also have latency issues..
+(p13)	ld8 r25 = [r19]		// get itc_lastcycle value
+	ld8 r9 = [r22],IA64_TIME_SN_SPEC_SNSEC_OFFSET	// sec
+	;;
+	ld8 r8 = [r22],-IA64_TIME_SN_SPEC_SNSEC_OFFSET	// snsec
+(p13)	sub r3 = r25,r2		// Diff needed before comparison (thanks davidm)
+	;;
+(p13)	cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared
+	sub r10 = r2,r24	// current_cycle - last_cycle
+	;;
+(p6)	sub r10 = r25,r24	// time we got was less than last_cycle
+(p7)	mov ar.ccv = r25	// more than last_cycle. Prep for cmpxchg
+	;;
+(p7)	cmpxchg8.rel r3 = [r19],r2,ar.ccv
+	;;
+(p7)	cmp.ne p7,p0 = r25,r3	// if cmpxchg not successful
+	;;
+(p7)	sub r10 = r3,r24	// then use new last_cycle instead
+	;;
+	and r10 = r10,r14	// Apply mask
+	;;
+	setf.sig f8 = r10
+	nop.i 123
+	;;
+	// fault check takes 5 cycles and we have spare time
+EX(.fail_efault, probe.w.fault r31, 3)
+	xmpy.l f8 = f8,f7	// nsec_per_cyc*(counter-last_counter)
+	;;
+	getf.sig r2 = f8
+	mf
+	;;
+	ld4 r10 = [r20]		// gtod_lock.sequence
+	add r8 = r8,r2		// Add xtime.nsecs
+	;;
+	shr.u r8 = r8,r23	// shift by factor
+	cmp4.ne p7,p0 = r28,r10
+(p7)	br.cond.dpnt.few .time_redo	// sequence number changed, redo
+	// End critical section.
+	// Now r8=tv->tv_nsec and r9=tv->tv_sec
+	mov r10 = r0
+	movl r2 = 1000000000
+	add r23 = IA64_TIMESPEC_TV_NSEC_OFFSET, r31
+(p14)	movl r3 = 2361183241434822607	// Prep for / 1000 hack
+	;;
+.time_normalize:
+	mov r21 = r8
+	cmp.ge p6,p0 = r8,r2
+(p14)	shr.u r20 = r8, 3 // We can repeat this if necessary just wasting time
+	;;
+(p14)	setf.sig f8 = r20
+(p6)	sub r8 = r8,r2
+(p6)	add r9 = 1,r9		// two nops before the branch.
+(p14)	setf.sig f7 = r3	// Chances for repeats are 1 in 10000 for gettod
+(p6)	br.cond.dpnt.few .time_normalize
+	;;
+	// Divided by 8 though shift. Now divide by 125
+	// The compiler was able to do that with a multiply
+	// and a shift and we do the same
+EX(.fail_efault, probe.w.fault r23, 3)	// This also costs 5 cycles
+(p14)	xmpy.hu f8 = f8, f7		// xmpy has 5 cycles latency so use it
+	;;
+(p14)	getf.sig r2 = f8
+	;;
+	mov r8 = r0
+(p14)	shr.u r21 = r2, 4
+	;;
+EX(.fail_efault, st8 [r31] = r9)
+EX(.fail_efault, st8 [r23] = r21)
+	FSYS_RETURN
+.fail_einval:
+	mov r8 = EINVAL
+	mov r10 = -1
+	FSYS_RETURN
+.fail_efault:
+	mov r8 = EFAULT
+	mov r10 = -1
+	FSYS_RETURN
+END(fsys_gettimeofday)
+
+ENTRY(fsys_clock_gettime)
+	.prologue
+	.altrp b6
+	.body
+	cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32
+	// Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC
+(p6)	br.spnt.few fsys_fallback_syscall
+	mov r31 = r33
+	shl r30 = r32,15
+	br.many .gettime
+END(fsys_clock_gettime)
+
+/*
+ * fsys_getcpu doesn't use the third parameter in this implementation. It reads
+ * current_thread_info()->cpu and corresponding node in cpu_to_node_map.
+ */
+ENTRY(fsys_getcpu)
+	.prologue
+	.altrp b6
+	.body
+	;;
+	add r2=TI_FLAGS+IA64_TASK_SIZE,r16
+	tnat.nz p6,p0 = r32			// guard against NaT argument
+	add r3=TI_CPU+IA64_TASK_SIZE,r16
+	;;
+	ld4 r3=[r3]				// M r3 = thread_info->cpu
+	ld4 r2=[r2]				// M r2 = thread_info->flags
+(p6)    br.cond.spnt.few .fail_einval		// B
+	;;
+	tnat.nz p7,p0 = r33			// I guard against NaT argument
+(p7)    br.cond.spnt.few .fail_einval		// B
+	;;
+	cmp.ne p6,p0=r32,r0
+	cmp.ne p7,p0=r33,r0
+	;;
+#ifdef CONFIG_NUMA
+	movl r17=cpu_to_node_map
+	;;
+EX(.fail_efault, (p6) probe.w.fault r32, 3)		// M This takes 5 cycles
+EX(.fail_efault, (p7) probe.w.fault r33, 3)		// M This takes 5 cycles
+	shladd r18=r3,1,r17
+	;;
+	ld2 r20=[r18]				// r20 = cpu_to_node_map[cpu]
+	and r2 = TIF_ALLWORK_MASK,r2
+	;;
+	cmp.ne p8,p0=0,r2
+(p8)	br.spnt.many fsys_fallback_syscall
+	;;
+	;;
+EX(.fail_efault, (p6) st4 [r32] = r3)
+EX(.fail_efault, (p7) st2 [r33] = r20)
+	mov r8=0
+	;;
+#else
+EX(.fail_efault, (p6) probe.w.fault r32, 3)		// M This takes 5 cycles
+EX(.fail_efault, (p7) probe.w.fault r33, 3)		// M This takes 5 cycles
+	and r2 = TIF_ALLWORK_MASK,r2
+	;;
+	cmp.ne p8,p0=0,r2
+(p8)	br.spnt.many fsys_fallback_syscall
+	;;
+EX(.fail_efault, (p6) st4 [r32] = r3)
+EX(.fail_efault, (p7) st2 [r33] = r0)
+	mov r8=0
+	;;
+#endif
+	FSYS_RETURN
+END(fsys_getcpu)
+
+ENTRY(fsys_fallback_syscall)
+	.prologue
+	.altrp b6
+	.body
+	/*
+	 * We only get here from light-weight syscall handlers.  Thus, we already
+	 * know that r15 contains a valid syscall number.  No need to re-check.
+	 */
+	adds r17=-1024,r15
+	movl r14=sys_call_table
+	;;
+	RSM_PSR_I(p0, r26, r27)
+	shladd r18=r17,3,r14
+	;;
+	ld8 r18=[r18]				// load normal (heavy-weight) syscall entry-point
+	MOV_FROM_PSR(p0, r29, r26)		// read psr (12 cyc load latency)
+	mov r27=ar.rsc
+	mov r21=ar.fpsr
+	mov r26=ar.pfs
+END(fsys_fallback_syscall)
+	/* FALL THROUGH */
+GLOBAL_ENTRY(fsys_bubble_down)
+	.prologue
+	.altrp b6
+	.body
+	/*
+	 * We get here for syscalls that don't have a lightweight
+	 * handler.  For those, we need to bubble down into the kernel
+	 * and that requires setting up a minimal pt_regs structure,
+	 * and initializing the CPU state more or less as if an
+	 * interruption had occurred.  To make syscall-restarts work,
+	 * we setup pt_regs such that cr_iip points to the second
+	 * instruction in syscall_via_break.  Decrementing the IP
+	 * hence will restart the syscall via break and not
+	 * decrementing IP will return us to the caller, as usual.
+	 * Note that we preserve the value of psr.pp rather than
+	 * initializing it from dcr.pp.  This makes it possible to
+	 * distinguish fsyscall execution from other privileged
+	 * execution.
+	 *
+	 * On entry:
+	 *	- normal fsyscall handler register usage, except
+	 *	  that we also have:
+	 *	- r18: address of syscall entry point
+	 *	- r21: ar.fpsr
+	 *	- r26: ar.pfs
+	 *	- r27: ar.rsc
+	 *	- r29: psr
+	 *
+	 * We used to clear some PSR bits here but that requires slow
+	 * serialization.  Fortunately, that isn't really necessary.
+	 * The rationale is as follows: we used to clear bits
+	 * ~PSR_PRESERVED_BITS in PSR.L.  Since
+	 * PSR_PRESERVED_BITS==PSR.{UP,MFL,MFH,PK,DT,PP,SP,RT,IC}, we
+	 * ended up clearing PSR.{BE,AC,I,DFL,DFH,DI,DB,SI,TB}.
+	 * However,
+	 *
+	 * PSR.BE : already is turned off in __kernel_syscall_via_epc()
+	 * PSR.AC : don't care (kernel normally turns PSR.AC on)
+	 * PSR.I  : already turned off by the time fsys_bubble_down gets
+	 *	    invoked
+	 * PSR.DFL: always 0 (kernel never turns it on)
+	 * PSR.DFH: don't care --- kernel never touches f32-f127 on its own
+	 *	    initiative
+	 * PSR.DI : always 0 (kernel never turns it on)
+	 * PSR.SI : always 0 (kernel never turns it on)
+	 * PSR.DB : don't care --- kernel never enables kernel-level
+	 *	    breakpoints
+	 * PSR.TB : must be 0 already; if it wasn't zero on entry to
+	 *          __kernel_syscall_via_epc, the branch to fsys_bubble_down
+	 *          will trigger a taken branch; the taken-trap-handler then
+	 *          converts the syscall into a break-based system-call.
+	 */
+	/*
+	 * Reading psr.l gives us only bits 0-31, psr.it, and psr.mc.
+	 * The rest we have to synthesize.
+	 */
+#	define PSR_ONE_BITS		((3 << IA64_PSR_CPL0_BIT)	\
+					 | (0x1 << IA64_PSR_RI_BIT)	\
+					 | IA64_PSR_BN | IA64_PSR_I)
+
+	invala					// M0|1
+	movl r14=ia64_ret_from_syscall		// X
+
+	nop.m 0
+	movl r28=__kernel_syscall_via_break	// X	create cr.iip
+	;;
+
+	mov r2=r16				// A    get task addr to addl-addressable register
+	adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // A
+	mov r31=pr				// I0   save pr (2 cyc)
+	;;
+	st1 [r16]=r0				// M2|3 clear current->thread.on_ustack flag
+	addl r22=IA64_RBS_OFFSET,r2		// A    compute base of RBS
+	add r3=TI_FLAGS+IA64_TASK_SIZE,r2	// A
+	;;
+	ld4 r3=[r3]				// M0|1 r3 = current_thread_info()->flags
+	lfetch.fault.excl.nt1 [r22]		// M0|1 prefetch register backing-store
+	nop.i 0
+	;;
+	mov ar.rsc=0				// M2   set enforced lazy mode, pl 0, LE, loadrs=0
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	MOV_FROM_ITC(p0, p6, r30, r23)		// M    get cycle for accounting
+#else
+	nop.m 0
+#endif
+	nop.i 0
+	;;
+	mov r23=ar.bspstore			// M2 (12 cyc) save ar.bspstore
+	mov.m r24=ar.rnat			// M2 (5 cyc) read ar.rnat (dual-issues!)
+	nop.i 0
+	;;
+	mov ar.bspstore=r22			// M2 (6 cyc) switch to kernel RBS
+	movl r8=PSR_ONE_BITS			// X
+	;;
+	mov r25=ar.unat				// M2 (5 cyc) save ar.unat
+	mov r19=b6				// I0   save b6 (2 cyc)
+	mov r20=r1				// A    save caller's gp in r20
+	;;
+	or r29=r8,r29				// A    construct cr.ipsr value to save
+	mov b6=r18				// I0   copy syscall entry-point to b6 (7 cyc)
+	addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 // A compute base of memory stack
+
+	mov r18=ar.bsp				// M2   save (kernel) ar.bsp (12 cyc)
+	cmp.ne pKStk,pUStk=r0,r0		// A    set pKStk <- 0, pUStk <- 1
+	br.call.sptk.many b7=ia64_syscall_setup	// B
+	;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	// mov.m r30=ar.itc is called in advance
+	add r16=TI_AC_STAMP+IA64_TASK_SIZE,r2
+	add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r2
+	;;
+	ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP	// time at last check in kernel
+	ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE	// time at leave kernel
+	;;
+	ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME	// cumulated stime
+	ld8 r21=[r17]				// cumulated utime
+	sub r22=r19,r18				// stime before leave kernel
+	;;
+	st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP	// update stamp
+	sub r18=r30,r19				// elapsed time in user mode
+	;;
+	add r20=r20,r22				// sum stime
+	add r21=r21,r18				// sum utime
+	;;
+	st8 [r16]=r20				// update stime
+	st8 [r17]=r21				// update utime
+	;;
+#endif
+	mov ar.rsc=0x3				// M2   set eager mode, pl 0, LE, loadrs=0
+	mov rp=r14				// I0   set the real return addr
+	and r3=_TIF_SYSCALL_TRACEAUDIT,r3	// A
+	;;
+	SSM_PSR_I(p0, p6, r22)			// M2   we're on kernel stacks now, reenable irqs
+	cmp.eq p8,p0=r3,r0			// A
+(p10)	br.cond.spnt.many ia64_ret_from_syscall	// B    return if bad call-frame or r15 is a NaT
+
+	nop.m 0
+(p8)	br.call.sptk.many b6=b6			// B    (ignore return address)
+	br.cond.spnt ia64_trace_syscall		// B
+END(fsys_bubble_down)
+
+	.rodata
+	.align 8
+	.globl fsyscall_table
+
+	data8 fsys_bubble_down
+fsyscall_table:
+	data8 fsys_ni_syscall
+	data8 0				// exit			// 1025
+	data8 0				// read
+	data8 0				// write
+	data8 0				// open
+	data8 0				// close
+	data8 0				// creat		// 1030
+	data8 0				// link
+	data8 0				// unlink
+	data8 0				// execve
+	data8 0				// chdir
+	data8 0				// fchdir		// 1035
+	data8 0				// utimes
+	data8 0				// mknod
+	data8 0				// chmod
+	data8 0				// chown
+	data8 0				// lseek		// 1040
+	data8 fsys_getpid		// getpid
+	data8 0				// getppid
+	data8 0				// mount
+	data8 0				// umount
+	data8 0				// setuid		// 1045
+	data8 0				// getuid
+	data8 0				// geteuid
+	data8 0				// ptrace
+	data8 0				// access
+	data8 0				// sync			// 1050
+	data8 0				// fsync
+	data8 0				// fdatasync
+	data8 0				// kill
+	data8 0				// rename
+	data8 0				// mkdir		// 1055
+	data8 0				// rmdir
+	data8 0				// dup
+	data8 0				// pipe
+	data8 0				// times
+	data8 0				// brk			// 1060
+	data8 0				// setgid
+	data8 0				// getgid
+	data8 0				// getegid
+	data8 0				// acct
+	data8 0				// ioctl		// 1065
+	data8 0				// fcntl
+	data8 0				// umask
+	data8 0				// chroot
+	data8 0				// ustat
+	data8 0				// dup2			// 1070
+	data8 0				// setreuid
+	data8 0				// setregid
+	data8 0				// getresuid
+	data8 0				// setresuid
+	data8 0				// getresgid		// 1075
+	data8 0				// setresgid
+	data8 0				// getgroups
+	data8 0				// setgroups
+	data8 0				// getpgid
+	data8 0				// setpgid		// 1080
+	data8 0				// setsid
+	data8 0				// getsid
+	data8 0				// sethostname
+	data8 0				// setrlimit
+	data8 0				// getrlimit		// 1085
+	data8 0				// getrusage
+	data8 fsys_gettimeofday		// gettimeofday
+	data8 0				// settimeofday
+	data8 0				// select
+	data8 0				// poll			// 1090
+	data8 0				// symlink
+	data8 0				// readlink
+	data8 0				// uselib
+	data8 0				// swapon
+	data8 0				// swapoff		// 1095
+	data8 0				// reboot
+	data8 0				// truncate
+	data8 0				// ftruncate
+	data8 0				// fchmod
+	data8 0				// fchown		// 1100
+	data8 0				// getpriority
+	data8 0				// setpriority
+	data8 0				// statfs
+	data8 0				// fstatfs
+	data8 0				// gettid		// 1105
+	data8 0				// semget
+	data8 0				// semop
+	data8 0				// semctl
+	data8 0				// msgget
+	data8 0				// msgsnd		// 1110
+	data8 0				// msgrcv
+	data8 0				// msgctl
+	data8 0				// shmget
+	data8 0				// shmat
+	data8 0				// shmdt		// 1115
+	data8 0				// shmctl
+	data8 0				// syslog
+	data8 0				// setitimer
+	data8 0				// getitimer
+	data8 0					 		// 1120
+	data8 0
+	data8 0
+	data8 0				// vhangup
+	data8 0				// lchown
+	data8 0				// remap_file_pages	// 1125
+	data8 0				// wait4
+	data8 0				// sysinfo
+	data8 0				// clone
+	data8 0				// setdomainname
+	data8 0				// newuname		// 1130
+	data8 0				// adjtimex
+	data8 0
+	data8 0				// init_module
+	data8 0				// delete_module
+	data8 0							// 1135
+	data8 0
+	data8 0				// quotactl
+	data8 0				// bdflush
+	data8 0				// sysfs
+	data8 0				// personality		// 1140
+	data8 0				// afs_syscall
+	data8 0				// setfsuid
+	data8 0				// setfsgid
+	data8 0				// getdents
+	data8 0				// flock		// 1145
+	data8 0				// readv
+	data8 0				// writev
+	data8 0				// pread64
+	data8 0				// pwrite64
+	data8 0				// sysctl		// 1150
+	data8 0				// mmap
+	data8 0				// munmap
+	data8 0				// mlock
+	data8 0				// mlockall
+	data8 0				// mprotect		// 1155
+	data8 0				// mremap
+	data8 0				// msync
+	data8 0				// munlock
+	data8 0				// munlockall
+	data8 0				// sched_getparam	// 1160
+	data8 0				// sched_setparam
+	data8 0				// sched_getscheduler
+	data8 0				// sched_setscheduler
+	data8 0				// sched_yield
+	data8 0				// sched_get_priority_max	// 1165
+	data8 0				// sched_get_priority_min
+	data8 0				// sched_rr_get_interval
+	data8 0				// nanosleep
+	data8 0				// nfsservctl
+	data8 0				// prctl		// 1170
+	data8 0				// getpagesize
+	data8 0				// mmap2
+	data8 0				// pciconfig_read
+	data8 0				// pciconfig_write
+	data8 0				// perfmonctl		// 1175
+	data8 0				// sigaltstack
+	data8 0				// rt_sigaction
+	data8 0				// rt_sigpending
+	data8 0				// rt_sigprocmask
+	data8 0				// rt_sigqueueinfo	// 1180
+	data8 0				// rt_sigreturn
+	data8 0				// rt_sigsuspend
+	data8 0				// rt_sigtimedwait
+	data8 0				// getcwd
+	data8 0				// capget		// 1185
+	data8 0				// capset
+	data8 0				// sendfile
+	data8 0
+	data8 0
+	data8 0				// socket		// 1190
+	data8 0				// bind
+	data8 0				// connect
+	data8 0				// listen
+	data8 0				// accept
+	data8 0				// getsockname		// 1195
+	data8 0				// getpeername
+	data8 0				// socketpair
+	data8 0				// send
+	data8 0				// sendto
+	data8 0				// recv			// 1200
+	data8 0				// recvfrom
+	data8 0				// shutdown
+	data8 0				// setsockopt
+	data8 0				// getsockopt
+	data8 0				// sendmsg		// 1205
+	data8 0				// recvmsg
+	data8 0				// pivot_root
+	data8 0				// mincore
+	data8 0				// madvise
+	data8 0				// newstat		// 1210
+	data8 0				// newlstat
+	data8 0				// newfstat
+	data8 0				// clone2
+	data8 0				// getdents64
+	data8 0				// getunwind		// 1215
+	data8 0				// readahead
+	data8 0				// setxattr
+	data8 0				// lsetxattr
+	data8 0				// fsetxattr
+	data8 0				// getxattr		// 1220
+	data8 0				// lgetxattr
+	data8 0				// fgetxattr
+	data8 0				// listxattr
+	data8 0				// llistxattr
+	data8 0				// flistxattr		// 1225
+	data8 0				// removexattr
+	data8 0				// lremovexattr
+	data8 0				// fremovexattr
+	data8 0				// tkill
+	data8 0				// futex		// 1230
+	data8 0				// sched_setaffinity
+	data8 0				// sched_getaffinity
+	data8 fsys_set_tid_address	// set_tid_address
+	data8 0				// fadvise64_64
+	data8 0				// tgkill		// 1235
+	data8 0				// exit_group
+	data8 0				// lookup_dcookie
+	data8 0				// io_setup
+	data8 0				// io_destroy
+	data8 0				// io_getevents		// 1240
+	data8 0				// io_submit
+	data8 0				// io_cancel
+	data8 0				// epoll_create
+	data8 0				// epoll_ctl
+	data8 0				// epoll_wait		// 1245
+	data8 0				// restart_syscall
+	data8 0				// semtimedop
+	data8 0				// timer_create
+	data8 0				// timer_settime
+	data8 0				// timer_gettime 	// 1250
+	data8 0				// timer_getoverrun
+	data8 0				// timer_delete
+	data8 0				// clock_settime
+	data8 fsys_clock_gettime	// clock_gettime
+	data8 0				// clock_getres		// 1255
+	data8 0				// clock_nanosleep
+	data8 0				// fstatfs64
+	data8 0				// statfs64
+	data8 0				// mbind
+	data8 0				// get_mempolicy	// 1260
+	data8 0				// set_mempolicy
+	data8 0				// mq_open
+	data8 0				// mq_unlink
+	data8 0				// mq_timedsend
+	data8 0				// mq_timedreceive	// 1265
+	data8 0				// mq_notify
+	data8 0				// mq_getsetattr
+	data8 0				// kexec_load
+	data8 0				// vserver
+	data8 0				// waitid		// 1270
+	data8 0				// add_key
+	data8 0				// request_key
+	data8 0				// keyctl
+	data8 0				// ioprio_set
+	data8 0				// ioprio_get		// 1275
+	data8 0				// move_pages
+	data8 0				// inotify_init
+	data8 0				// inotify_add_watch
+	data8 0				// inotify_rm_watch
+	data8 0				// migrate_pages	// 1280
+	data8 0				// openat
+	data8 0				// mkdirat
+	data8 0				// mknodat
+	data8 0				// fchownat
+	data8 0				// futimesat		// 1285
+	data8 0				// newfstatat
+	data8 0				// unlinkat
+	data8 0				// renameat
+	data8 0				// linkat
+	data8 0				// symlinkat		// 1290
+	data8 0				// readlinkat
+	data8 0				// fchmodat
+	data8 0				// faccessat
+	data8 0
+	data8 0							// 1295
+	data8 0				// unshare
+	data8 0				// splice
+	data8 0				// set_robust_list
+	data8 0				// get_robust_list
+	data8 0				// sync_file_range	// 1300
+	data8 0				// tee
+	data8 0				// vmsplice
+	data8 0
+	data8 fsys_getcpu		// getcpu		// 1304
+
+	// fill in zeros for the remaining entries
+	.zero:
+	.space fsyscall_table + 8*NR_syscalls - .zero, 0
diff --git a/arch/ia64/kernel/fsyscall_gtod_data.h b/arch/ia64/kernel/fsyscall_gtod_data.h
new file mode 100644
index 000000000..cc2861445
--- /dev/null
+++ b/arch/ia64/kernel/fsyscall_gtod_data.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
+ *        Contributed by Peter Keilty <peter.keilty@hp.com>
+ *
+ * fsyscall gettimeofday data
+ */
+
+/* like timespec, but includes "shifted nanoseconds" */
+struct time_sn_spec {
+	u64	sec;
+	u64	snsec;
+};
+
+struct fsyscall_gtod_data_t {
+	seqcount_t	seq;
+	struct time_sn_spec wall_time;
+	struct time_sn_spec monotonic_time;
+	u64		clk_mask;
+	u32		clk_mult;
+	u32		clk_shift;
+	void		*clk_fsys_mmio;
+	u64		clk_cycle_last;
+} ____cacheline_aligned;
+
+struct itc_jitter_data_t {
+	int		itc_jitter;
+	u64		itc_lastcycle;
+} ____cacheline_aligned;
+
diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
new file mode 100644
index 000000000..d6360fd40
--- /dev/null
+++ b/arch/ia64/kernel/ftrace.c
@@ -0,0 +1,196 @@
+/*
+ * Dynamic function tracing support.
+ *
+ * Copyright (C) 2008 Shaohua Li <shaohua.li@intel.com>
+ *
+ * For licencing details, see COPYING.
+ *
+ * Defines low-level handling of mcount calls when the kernel
+ * is compiled with the -pg flag. When using dynamic ftrace, the
+ * mcount call-sites get patched lazily with NOP till they are
+ * enabled. All code mutation routines here take effect atomically.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/ftrace.h>
+
+#include <asm/cacheflush.h>
+#include <asm/patch.h>
+
+/* In IA64, each function will be added below two bundles with -pg option */
+static unsigned char __attribute__((aligned(8)))
+ftrace_orig_code[MCOUNT_INSN_SIZE] = {
+	0x02, 0x40, 0x31, 0x10, 0x80, 0x05, /* alloc r40=ar.pfs,12,8,0 */
+	0xb0, 0x02, 0x00, 0x00, 0x42, 0x40, /* mov r43=r0;; */
+	0x05, 0x00, 0xc4, 0x00,             /* mov r42=b0 */
+	0x11, 0x48, 0x01, 0x02, 0x00, 0x21, /* mov r41=r1 */
+	0x00, 0x00, 0x00, 0x02, 0x00, 0x00, /* nop.i 0x0 */
+	0x08, 0x00, 0x00, 0x50              /* br.call.sptk.many b0 = _mcount;; */
+};
+
+struct ftrace_orig_insn {
+	u64 dummy1, dummy2, dummy3;
+	u64 dummy4:64-41+13;
+	u64 imm20:20;
+	u64 dummy5:3;
+	u64 sign:1;
+	u64 dummy6:4;
+};
+
+/* mcount stub will be converted below for nop */
+static unsigned char ftrace_nop_code[MCOUNT_INSN_SIZE] = {
+	0x00, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MII] nop.m 0x0 */
+	0x30, 0x00, 0x00, 0x60, 0x00, 0x00, /* mov r3=ip */
+	0x00, 0x00, 0x04, 0x00,             /* nop.i 0x0 */
+	0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0x0 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* nop.x 0x0;; */
+	0x00, 0x00, 0x04, 0x00
+};
+
+static unsigned char *ftrace_nop_replace(void)
+{
+	return ftrace_nop_code;
+}
+
+/*
+ * mcount stub will be converted below for call
+ * Note: Just the last instruction is changed against nop
+ * */
+static unsigned char __attribute__((aligned(8)))
+ftrace_call_code[MCOUNT_INSN_SIZE] = {
+	0x00, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MII] nop.m 0x0 */
+	0x30, 0x00, 0x00, 0x60, 0x00, 0x00, /* mov r3=ip */
+	0x00, 0x00, 0x04, 0x00,             /* nop.i 0x0 */
+	0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0x0 */
+	0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, /* brl.many .;;*/
+	0xf8, 0xff, 0xff, 0xc8
+};
+
+struct ftrace_call_insn {
+	u64 dummy1, dummy2;
+	u64 dummy3:48;
+	u64 imm39_l:16;
+	u64 imm39_h:23;
+	u64 dummy4:13;
+	u64 imm20:20;
+	u64 dummy5:3;
+	u64 i:1;
+	u64 dummy6:4;
+};
+
+static unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
+{
+	struct ftrace_call_insn *code = (void *)ftrace_call_code;
+	unsigned long offset = addr - (ip + 0x10);
+
+	code->imm39_l = offset >> 24;
+	code->imm39_h = offset >> 40;
+	code->imm20 = offset >> 4;
+	code->i = offset >> 63;
+	return ftrace_call_code;
+}
+
+static int
+ftrace_modify_code(unsigned long ip, unsigned char *old_code,
+		   unsigned char *new_code, int do_check)
+{
+	unsigned char replaced[MCOUNT_INSN_SIZE];
+
+	/*
+	 * Note:
+	 * We are paranoid about modifying text, as if a bug was to happen, it
+	 * could cause us to read or write to someplace that could cause harm.
+	 * Carefully read and modify the code with probe_kernel_*(), and make
+	 * sure what we read is what we expected it to be before modifying it.
+	 */
+
+	if (!do_check)
+		goto skip_check;
+
+	/* read the text we want to modify */
+	if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+		return -EFAULT;
+
+	/* Make sure it is what we expect it to be */
+	if (memcmp(replaced, old_code, MCOUNT_INSN_SIZE) != 0)
+		return -EINVAL;
+
+skip_check:
+	/* replace the text with the new text */
+	if (copy_to_kernel_nofault(((void *)ip), new_code, MCOUNT_INSN_SIZE))
+		return -EPERM;
+	flush_icache_range(ip, ip + MCOUNT_INSN_SIZE);
+
+	return 0;
+}
+
+static int ftrace_make_nop_check(struct dyn_ftrace *rec, unsigned long addr)
+{
+	unsigned char __attribute__((aligned(8))) replaced[MCOUNT_INSN_SIZE];
+	unsigned long ip = rec->ip;
+
+	if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+		return -EFAULT;
+	if (rec->flags & FTRACE_FL_CONVERTED) {
+		struct ftrace_call_insn *call_insn, *tmp_call;
+
+		call_insn = (void *)ftrace_call_code;
+		tmp_call = (void *)replaced;
+		call_insn->imm39_l = tmp_call->imm39_l;
+		call_insn->imm39_h = tmp_call->imm39_h;
+		call_insn->imm20 = tmp_call->imm20;
+		call_insn->i = tmp_call->i;
+		if (memcmp(replaced, ftrace_call_code, MCOUNT_INSN_SIZE) != 0)
+			return -EINVAL;
+		return 0;
+	} else {
+		struct ftrace_orig_insn *call_insn, *tmp_call;
+
+		call_insn = (void *)ftrace_orig_code;
+		tmp_call = (void *)replaced;
+		call_insn->sign = tmp_call->sign;
+		call_insn->imm20 = tmp_call->imm20;
+		if (memcmp(replaced, ftrace_orig_code, MCOUNT_INSN_SIZE) != 0)
+			return -EINVAL;
+		return 0;
+	}
+}
+
+int ftrace_make_nop(struct module *mod,
+		    struct dyn_ftrace *rec, unsigned long addr)
+{
+	int ret;
+	char *new;
+
+	ret = ftrace_make_nop_check(rec, addr);
+	if (ret)
+		return ret;
+	new = ftrace_nop_replace();
+	return ftrace_modify_code(rec->ip, NULL, new, 0);
+}
+
+int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+{
+	unsigned long ip = rec->ip;
+	unsigned char *old, *new;
+
+	old=  ftrace_nop_replace();
+	new = ftrace_call_replace(ip, addr);
+	return ftrace_modify_code(ip, old, new, 1);
+}
+
+/* in IA64, _mcount can't directly call ftrace_stub. Only jump is ok */
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+	unsigned long ip;
+	unsigned long addr = ((struct fnptr *)ftrace_call)->ip;
+
+	if (func == ftrace_stub)
+		return 0;
+	ip = ((struct fnptr *)func)->ip;
+
+	ia64_patch_imm64(addr + 2, ip);
+
+	flush_icache_range(addr, addr + 16);
+	return 0;
+}
diff --git a/arch/ia64/kernel/gate-data.S b/arch/ia64/kernel/gate-data.S
new file mode 100644
index 000000000..b3ef1c72e
--- /dev/null
+++ b/arch/ia64/kernel/gate-data.S
@@ -0,0 +1,3 @@
+	.section .data..gate, "aw"
+
+	.incbin "arch/ia64/kernel/gate.so"
diff --git a/arch/ia64/kernel/gate.S b/arch/ia64/kernel/gate.S
new file mode 100644
index 000000000..9f235cd55
--- /dev/null
+++ b/arch/ia64/kernel/gate.S
@@ -0,0 +1,380 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This file contains the code that gets mapped at the upper end of each task's text
+ * region.  For now, it contains the signal trampoline code only.
+ *
+ * Copyright (C) 1999-2003 Hewlett-Packard Co
+ * 	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+
+#include <asm/asmmacro.h>
+#include <asm/errno.h>
+#include <asm/asm-offsets.h>
+#include <asm/sigcontext.h>
+#include <asm/unistd.h>
+#include <asm/kregs.h>
+#include <asm/page.h>
+#include <asm/native/inst.h>
+
+/*
+ * We can't easily refer to symbols inside the kernel.  To avoid full runtime relocation,
+ * complications with the linker (which likes to create PLT stubs for branches
+ * to targets outside the shared object) and to avoid multi-phase kernel builds, we
+ * simply create minimalistic "patch lists" in special ELF sections.
+ */
+	.section ".data..patch.fsyscall_table", "a"
+	.previous
+#define LOAD_FSYSCALL_TABLE(reg)			\
+[1:]	movl reg=0;					\
+	.xdata4 ".data..patch.fsyscall_table", 1b-.
+
+	.section ".data..patch.brl_fsys_bubble_down", "a"
+	.previous
+#define BRL_COND_FSYS_BUBBLE_DOWN(pr)			\
+[1:](pr)brl.cond.sptk 0;				\
+	;;						\
+	.xdata4 ".data..patch.brl_fsys_bubble_down", 1b-.
+
+GLOBAL_ENTRY(__kernel_syscall_via_break)
+	.prologue
+	.altrp b6
+	.body
+	/*
+	 * Note: for (fast) syscall restart to work, the break instruction must be
+	 *	 the first one in the bundle addressed by syscall_via_break.
+	 */
+{ .mib
+	break 0x100000
+	nop.i 0
+	br.ret.sptk.many b6
+}
+END(__kernel_syscall_via_break)
+
+#	define ARG0_OFF		(16 + IA64_SIGFRAME_ARG0_OFFSET)
+#	define ARG1_OFF		(16 + IA64_SIGFRAME_ARG1_OFFSET)
+#	define ARG2_OFF		(16 + IA64_SIGFRAME_ARG2_OFFSET)
+#	define SIGHANDLER_OFF	(16 + IA64_SIGFRAME_HANDLER_OFFSET)
+#	define SIGCONTEXT_OFF	(16 + IA64_SIGFRAME_SIGCONTEXT_OFFSET)
+
+#	define FLAGS_OFF	IA64_SIGCONTEXT_FLAGS_OFFSET
+#	define CFM_OFF		IA64_SIGCONTEXT_CFM_OFFSET
+#	define FR6_OFF		IA64_SIGCONTEXT_FR6_OFFSET
+#	define BSP_OFF		IA64_SIGCONTEXT_AR_BSP_OFFSET
+#	define RNAT_OFF		IA64_SIGCONTEXT_AR_RNAT_OFFSET
+#	define UNAT_OFF		IA64_SIGCONTEXT_AR_UNAT_OFFSET
+#	define FPSR_OFF		IA64_SIGCONTEXT_AR_FPSR_OFFSET
+#	define PR_OFF		IA64_SIGCONTEXT_PR_OFFSET
+#	define RP_OFF		IA64_SIGCONTEXT_IP_OFFSET
+#	define SP_OFF		IA64_SIGCONTEXT_R12_OFFSET
+#	define RBS_BASE_OFF	IA64_SIGCONTEXT_RBS_BASE_OFFSET
+#	define LOADRS_OFF	IA64_SIGCONTEXT_LOADRS_OFFSET
+#	define base0		r2
+#	define base1		r3
+	/*
+	 * When we get here, the memory stack looks like this:
+	 *
+	 *   +===============================+
+       	 *   |				     |
+       	 *   //	    struct sigframe          //
+       	 *   |				     |
+	 *   +-------------------------------+ <-- sp+16
+	 *   |      16 byte of scratch       |
+	 *   |            space              |
+	 *   +-------------------------------+ <-- sp
+	 *
+	 * The register stack looks _exactly_ the way it looked at the time the signal
+	 * occurred.  In other words, we're treading on a potential mine-field: each
+	 * incoming general register may be a NaT value (including sp, in which case the
+	 * process ends up dying with a SIGSEGV).
+	 *
+	 * The first thing need to do is a cover to get the registers onto the backing
+	 * store.  Once that is done, we invoke the signal handler which may modify some
+	 * of the machine state.  After returning from the signal handler, we return
+	 * control to the previous context by executing a sigreturn system call.  A signal
+	 * handler may call the rt_sigreturn() function to directly return to a given
+	 * sigcontext.  However, the user-level sigreturn() needs to do much more than
+	 * calling the rt_sigreturn() system call as it needs to unwind the stack to
+	 * restore preserved registers that may have been saved on the signal handler's
+	 * call stack.
+	 */
+
+#define SIGTRAMP_SAVES										\
+	.unwabi 3, 's';		/* mark this as a sigtramp handler (saves scratch regs) */	\
+	.unwabi @svr4, 's'; /* backwards compatibility with old unwinders (remove in v2.7) */	\
+	.savesp ar.unat, UNAT_OFF+SIGCONTEXT_OFF;						\
+	.savesp ar.fpsr, FPSR_OFF+SIGCONTEXT_OFF;						\
+	.savesp pr, PR_OFF+SIGCONTEXT_OFF;     							\
+	.savesp rp, RP_OFF+SIGCONTEXT_OFF;							\
+	.savesp ar.pfs, CFM_OFF+SIGCONTEXT_OFF;							\
+	.vframesp SP_OFF+SIGCONTEXT_OFF
+
+GLOBAL_ENTRY(__kernel_sigtramp)
+	// describe the state that is active when we get here:
+	.prologue
+	SIGTRAMP_SAVES
+	.body
+
+	.label_state 1
+
+	adds base0=SIGHANDLER_OFF,sp
+	adds base1=RBS_BASE_OFF+SIGCONTEXT_OFF,sp
+	br.call.sptk.many rp=1f
+1:
+	ld8 r17=[base0],(ARG0_OFF-SIGHANDLER_OFF)	// get pointer to signal handler's plabel
+	ld8 r15=[base1]					// get address of new RBS base (or NULL)
+	cover				// push args in interrupted frame onto backing store
+	;;
+	cmp.ne p1,p0=r15,r0		// do we need to switch rbs? (note: pr is saved by kernel)
+	mov.m r9=ar.bsp			// fetch ar.bsp
+	.spillsp.p p1, ar.rnat, RNAT_OFF+SIGCONTEXT_OFF
+(p1)	br.cond.spnt setup_rbs		// yup -> (clobbers p8, r14-r16, and r18-r20)
+back_from_setup_rbs:
+	alloc r8=ar.pfs,0,0,3,0
+	ld8 out0=[base0],16		// load arg0 (signum)
+	adds base1=(ARG1_OFF-(RBS_BASE_OFF+SIGCONTEXT_OFF)),base1
+	;;
+	ld8 out1=[base1]		// load arg1 (siginfop)
+	ld8 r10=[r17],8			// get signal handler entry point
+	;;
+	ld8 out2=[base0]		// load arg2 (sigcontextp)
+	ld8 gp=[r17]			// get signal handler's global pointer
+	adds base0=(BSP_OFF+SIGCONTEXT_OFF),sp
+	;;
+	.spillsp ar.bsp, BSP_OFF+SIGCONTEXT_OFF
+	st8 [base0]=r9			// save sc_ar_bsp
+	adds base0=(FR6_OFF+SIGCONTEXT_OFF),sp
+	adds base1=(FR6_OFF+16+SIGCONTEXT_OFF),sp
+	;;
+	stf.spill [base0]=f6,32
+	stf.spill [base1]=f7,32
+	;;
+	stf.spill [base0]=f8,32
+	stf.spill [base1]=f9,32
+	mov b6=r10
+	;;
+	stf.spill [base0]=f10,32
+	stf.spill [base1]=f11,32
+	;;
+	stf.spill [base0]=f12,32
+	stf.spill [base1]=f13,32
+	;;
+	stf.spill [base0]=f14,32
+	stf.spill [base1]=f15,32
+	br.call.sptk.many rp=b6			// call the signal handler
+.ret0:	adds base0=(BSP_OFF+SIGCONTEXT_OFF),sp
+	;;
+	ld8 r15=[base0]				// fetch sc_ar_bsp
+	mov r14=ar.bsp
+	;;
+	cmp.ne p1,p0=r14,r15			// do we need to restore the rbs?
+(p1)	br.cond.spnt restore_rbs		// yup -> (clobbers r14-r18, f6 & f7)
+	;;
+back_from_restore_rbs:
+	adds base0=(FR6_OFF+SIGCONTEXT_OFF),sp
+	adds base1=(FR6_OFF+16+SIGCONTEXT_OFF),sp
+	;;
+	ldf.fill f6=[base0],32
+	ldf.fill f7=[base1],32
+	;;
+	ldf.fill f8=[base0],32
+	ldf.fill f9=[base1],32
+	;;
+	ldf.fill f10=[base0],32
+	ldf.fill f11=[base1],32
+	;;
+	ldf.fill f12=[base0],32
+	ldf.fill f13=[base1],32
+	;;
+	ldf.fill f14=[base0],32
+	ldf.fill f15=[base1],32
+	mov r15=__NR_rt_sigreturn
+	.restore sp				// pop .prologue
+	break __BREAK_SYSCALL
+
+	.prologue
+	SIGTRAMP_SAVES
+setup_rbs:
+	mov ar.rsc=0				// put RSE into enforced lazy mode
+	;;
+	.save ar.rnat, r19
+	mov r19=ar.rnat				// save RNaT before switching backing store area
+	adds r14=(RNAT_OFF+SIGCONTEXT_OFF),sp
+
+	mov r18=ar.bspstore
+	mov ar.bspstore=r15			// switch over to new register backing store area
+	;;
+
+	.spillsp ar.rnat, RNAT_OFF+SIGCONTEXT_OFF
+	st8 [r14]=r19				// save sc_ar_rnat
+	.body
+	mov.m r16=ar.bsp			// sc_loadrs <- (new bsp - new bspstore) << 16
+	adds r14=(LOADRS_OFF+SIGCONTEXT_OFF),sp
+	;;
+	invala
+	sub r15=r16,r15
+	extr.u r20=r18,3,6
+	;;
+	mov ar.rsc=0xf				// set RSE into eager mode, pl 3
+	cmp.eq p8,p0=63,r20
+	shl r15=r15,16
+	;;
+	st8 [r14]=r15				// save sc_loadrs
+(p8)	st8 [r18]=r19		// if bspstore points at RNaT slot, store RNaT there now
+	.restore sp				// pop .prologue
+	br.cond.sptk back_from_setup_rbs
+
+	.prologue
+	SIGTRAMP_SAVES
+	.spillsp ar.rnat, RNAT_OFF+SIGCONTEXT_OFF
+	.body
+restore_rbs:
+	// On input:
+	//	r14 = bsp1 (bsp at the time of return from signal handler)
+	//	r15 = bsp0 (bsp at the time the signal occurred)
+	//
+	// Here, we need to calculate bspstore0, the value that ar.bspstore needs
+	// to be set to, based on bsp0 and the size of the dirty partition on
+	// the alternate stack (sc_loadrs >> 16).  This can be done with the
+	// following algorithm:
+	//
+	//  bspstore0 = rse_skip_regs(bsp0, -rse_num_regs(bsp1 - (loadrs >> 19), bsp1));
+	//
+	// This is what the code below does.
+	//
+	alloc r2=ar.pfs,0,0,0,0			// alloc null frame
+	adds r16=(LOADRS_OFF+SIGCONTEXT_OFF),sp
+	adds r18=(RNAT_OFF+SIGCONTEXT_OFF),sp
+	;;
+	ld8 r17=[r16]
+	ld8 r16=[r18]			// get new rnat
+	extr.u r18=r15,3,6	// r18 <- rse_slot_num(bsp0)
+	;;
+	mov ar.rsc=r17			// put RSE into enforced lazy mode
+	shr.u r17=r17,16
+	;;
+	sub r14=r14,r17		// r14 (bspstore1) <- bsp1 - (sc_loadrs >> 16)
+	shr.u r17=r17,3		// r17 <- (sc_loadrs >> 19)
+	;;
+	loadrs			// restore dirty partition
+	extr.u r14=r14,3,6	// r14 <- rse_slot_num(bspstore1)
+	;;
+	add r14=r14,r17		// r14 <- rse_slot_num(bspstore1) + (sc_loadrs >> 19)
+	;;
+	shr.u r14=r14,6		// r14 <- (rse_slot_num(bspstore1) + (sc_loadrs >> 19))/0x40
+	;;
+	sub r14=r14,r17		// r14 <- -rse_num_regs(bspstore1, bsp1)
+	movl r17=0x8208208208208209
+	;;
+	add r18=r18,r14		// r18 (delta) <- rse_slot_num(bsp0) - rse_num_regs(bspstore1,bsp1)
+	setf.sig f7=r17
+	cmp.lt p7,p0=r14,r0	// p7 <- (r14 < 0)?
+	;;
+(p7)	adds r18=-62,r18	// delta -= 62
+	;;
+	setf.sig f6=r18
+	;;
+	xmpy.h f6=f6,f7
+	;;
+	getf.sig r17=f6
+	;;
+	add r17=r17,r18
+	shr r18=r18,63
+	;;
+	shr r17=r17,5
+	;;
+	sub r17=r17,r18		// r17 = delta/63
+	;;
+	add r17=r14,r17		// r17 <- delta/63 - rse_num_regs(bspstore1, bsp1)
+	;;
+	shladd r15=r17,3,r15	// r15 <- bsp0 + 8*(delta/63 - rse_num_regs(bspstore1, bsp1))
+	;;
+	mov ar.bspstore=r15			// switch back to old register backing store area
+	;;
+	mov ar.rnat=r16				// restore RNaT
+	mov ar.rsc=0xf				// (will be restored later on from sc_ar_rsc)
+	// invala not necessary as that will happen when returning to user-mode
+	br.cond.sptk back_from_restore_rbs
+END(__kernel_sigtramp)
+
+/*
+ * On entry:
+ *	r11 = saved ar.pfs
+ *	r15 = system call #
+ *	b0  = saved return address
+ *	b6  = return address
+ * On exit:
+ *	r11 = saved ar.pfs
+ *	r15 = system call #
+ *	b0  = saved return address
+ *	all other "scratch" registers:	undefined
+ *	all "preserved" registers:	same as on entry
+ */
+
+GLOBAL_ENTRY(__kernel_syscall_via_epc)
+	.prologue
+	.altrp b6
+	.body
+{
+	/*
+	 * Note: the kernel cannot assume that the first two instructions in this
+	 * bundle get executed.  The remaining code must be safe even if
+	 * they do not get executed.
+	 */
+	adds r17=-1024,r15			// A
+	mov r10=0				// A    default to successful syscall execution
+	epc					// B	causes split-issue
+}
+	;;
+	RSM_PSR_BE_I(r20, r22)			// M2 (5 cyc to srlz.d)
+	LOAD_FSYSCALL_TABLE(r14)		// X
+	;;
+	mov r16=IA64_KR(CURRENT)		// M2 (12 cyc)
+	shladd r18=r17,3,r14			// A
+	mov r19=NR_syscalls-1			// A
+	;;
+	lfetch [r18]				// M0|1
+	MOV_FROM_PSR(p0, r29, r8)		// M2 (12 cyc)
+	// If r17 is a NaT, p6 will be zero
+	cmp.geu p6,p7=r19,r17			// A    (sysnr > 0 && sysnr < 1024+NR_syscalls)?
+	;;
+	mov r21=ar.fpsr				// M2 (12 cyc)
+	tnat.nz p10,p9=r15			// I0
+	mov.i r26=ar.pfs			// I0 (would stall anyhow due to srlz.d...)
+	;;
+	srlz.d					// M0 (forces split-issue) ensure PSR.BE==0
+(p6)	ld8 r18=[r18]				// M0|1
+	nop.i 0
+	;;
+	nop.m 0
+(p6)	tbit.z.unc p8,p0=r18,0			// I0 (dual-issues with "mov b7=r18"!)
+	nop.i 0
+	;;
+	SSM_PSR_I(p8, p14, r25)
+(p6)	mov b7=r18				// I0
+(p8)	br.dptk.many b7				// B
+
+	mov r27=ar.rsc				// M2 (12 cyc)
+/*
+ * brl.cond doesn't work as intended because the linker would convert this branch
+ * into a branch to a PLT.  Perhaps there will be a way to avoid this with some
+ * future version of the linker.  In the meantime, we just use an indirect branch
+ * instead.
+ */
+#ifdef CONFIG_ITANIUM
+(p6)	add r14=-8,r14				// r14 <- addr of fsys_bubble_down entry
+	;;
+(p6)	ld8 r14=[r14]				// r14 <- fsys_bubble_down
+	;;
+(p6)	mov b7=r14
+(p6)	br.sptk.many b7
+#else
+	BRL_COND_FSYS_BUBBLE_DOWN(p6)
+#endif
+	SSM_PSR_I(p0, p14, r10)
+	mov r10=-1
+(p10)	mov r8=EINVAL
+(p9)	mov r8=ENOSYS
+	FSYS_RETURN
+
+END(__kernel_syscall_via_epc)
diff --git a/arch/ia64/kernel/gate.lds.S b/arch/ia64/kernel/gate.lds.S
new file mode 100644
index 000000000..461c7e69d
--- /dev/null
+++ b/arch/ia64/kernel/gate.lds.S
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Linker script for gate DSO.  The gate pages are an ELF shared object
+ * prelinked to its virtual address, with only one read-only segment and
+ * one execute-only segment (both fit in one page).  This script controls
+ * its layout.
+ */
+
+#include <asm/page.h>
+
+SECTIONS
+{
+	. = GATE_ADDR + SIZEOF_HEADERS;
+
+	.hash			: { *(.hash) }		:readable
+	.gnu.hash		: { *(.gnu.hash) }
+	.dynsym			: { *(.dynsym) }
+	.dynstr			: { *(.dynstr) }
+	.gnu.version		: { *(.gnu.version) }
+	.gnu.version_d		: { *(.gnu.version_d) }
+	.gnu.version_r		: { *(.gnu.version_r) }
+
+	.note			: { *(.note*) }		:readable	:note
+
+	.dynamic		: { *(.dynamic) }	:readable	:dynamic
+
+	/*
+	 * This linker script is used both with -r and with -shared.  For
+	 * the layouts to match, we need to skip more than enough space for
+	 * the dynamic symbol table et al.  If this amount is insufficient,
+	 * ld -shared will barf.  Just increase it here.
+	 */
+	. = GATE_ADDR + 0x600;
+
+	.data..patch		: {
+		__start_gate_mckinley_e9_patchlist = .;
+		*(.data..patch.mckinley_e9)
+		__end_gate_mckinley_e9_patchlist = .;
+
+		__start_gate_vtop_patchlist = .;
+		*(.data..patch.vtop)
+		__end_gate_vtop_patchlist = .;
+
+		__start_gate_fsyscall_patchlist = .;
+		*(.data..patch.fsyscall_table)
+		__end_gate_fsyscall_patchlist = .;
+
+		__start_gate_brl_fsys_bubble_down_patchlist = .;
+		*(.data..patch.brl_fsys_bubble_down)
+		__end_gate_brl_fsys_bubble_down_patchlist = .;
+	}						:readable
+
+	.IA_64.unwind_info	: { *(.IA_64.unwind_info*) }
+	.IA_64.unwind		: { *(.IA_64.unwind*) }	:readable	:unwind
+#ifdef HAVE_BUGGY_SEGREL
+	.text (GATE_ADDR + PAGE_SIZE) : { *(.text) *(.text.*) }	:readable
+#else
+	. = ALIGN(PERCPU_PAGE_SIZE) + (. & (PERCPU_PAGE_SIZE - 1));
+	.text			: { *(.text) *(.text.*) }	:epc
+#endif
+
+	/DISCARD/		: {
+		*(.got.plt) *(.got)
+		*(.data .data.* .gnu.linkonce.d.*)
+		*(.dynbss)
+		*(.bss .bss.* .gnu.linkonce.b.*)
+		*(__ex_table)
+		*(__mca_table)
+	}
+}
+
+/*
+ * ld does not recognize this name token; use the constant.
+ */
+#define	PT_IA_64_UNWIND	0x70000001
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+	readable	PT_LOAD	FILEHDR	PHDRS	FLAGS(4);	/* PF_R */
+#ifndef HAVE_BUGGY_SEGREL
+	epc		PT_LOAD	FILEHDR PHDRS	FLAGS(1);	/* PF_X */
+#endif
+	dynamic		PT_DYNAMIC		FLAGS(4);	/* PF_R */
+	note		PT_NOTE			FLAGS(4);	/* PF_R */
+	unwind		PT_IA_64_UNWIND;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+	LINUX_2.5 {
+	global:
+		__kernel_syscall_via_break;
+		__kernel_syscall_via_epc;
+		__kernel_sigtramp;
+
+	local: *;
+	};
+}
+
+/* The ELF entry point can be used to set the AT_SYSINFO value.  */
+ENTRY(__kernel_syscall_via_epc)
diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
new file mode 100644
index 000000000..f22469f1c
--- /dev/null
+++ b/arch/ia64/kernel/head.S
@@ -0,0 +1,1168 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Here is where the ball gets rolling as far as the kernel is concerned.
+ * When control is transferred to _start, the bootload has already
+ * loaded us to the correct address.  All that's left to do here is
+ * to set up the kernel's global pointer and jump to the kernel
+ * entry point.
+ *
+ * Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999 Intel Corp.
+ * Copyright (C) 1999 Asit Mallick <Asit.K.Mallick@intel.com>
+ * Copyright (C) 1999 Don Dugger <Don.Dugger@intel.com>
+ * Copyright (C) 2002 Fenghua Yu <fenghua.yu@intel.com>
+ *   -Optimize __ia64_save_fpu() and __ia64_load_fpu() for Itanium 2.
+ * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
+ *   Support for CPU Hotplug
+ */
+
+
+#include <linux/pgtable.h>
+#include <asm/asmmacro.h>
+#include <asm/fpu.h>
+#include <asm/kregs.h>
+#include <asm/mmu_context.h>
+#include <asm/asm-offsets.h>
+#include <asm/pal.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/mca_asm.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/export.h>
+
+#ifdef CONFIG_HOTPLUG_CPU
+#define SAL_PSR_BITS_TO_SET				\
+	(IA64_PSR_AC | IA64_PSR_BN | IA64_PSR_MFH | IA64_PSR_MFL)
+
+#define SAVE_FROM_REG(src, ptr, dest)	\
+	mov dest=src;;						\
+	st8 [ptr]=dest,0x08
+
+#define RESTORE_REG(reg, ptr, _tmp)		\
+	ld8 _tmp=[ptr],0x08;;				\
+	mov reg=_tmp
+
+#define SAVE_BREAK_REGS(ptr, _idx, _breg, _dest)\
+	mov ar.lc=IA64_NUM_DBG_REGS-1;; 			\
+	mov _idx=0;; 								\
+1: 												\
+	SAVE_FROM_REG(_breg[_idx], ptr, _dest);;	\
+	add _idx=1,_idx;;							\
+	br.cloop.sptk.many 1b
+
+#define RESTORE_BREAK_REGS(ptr, _idx, _breg, _tmp, _lbl)\
+	mov ar.lc=IA64_NUM_DBG_REGS-1;;			\
+	mov _idx=0;;							\
+_lbl:  RESTORE_REG(_breg[_idx], ptr, _tmp);;	\
+	add _idx=1, _idx;;						\
+	br.cloop.sptk.many _lbl
+
+#define SAVE_ONE_RR(num, _reg, _tmp) \
+	movl _tmp=(num<<61);;	\
+	mov _reg=rr[_tmp]
+
+#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
+	SAVE_ONE_RR(0,_r0, _tmp);; \
+	SAVE_ONE_RR(1,_r1, _tmp);; \
+	SAVE_ONE_RR(2,_r2, _tmp);; \
+	SAVE_ONE_RR(3,_r3, _tmp);; \
+	SAVE_ONE_RR(4,_r4, _tmp);; \
+	SAVE_ONE_RR(5,_r5, _tmp);; \
+	SAVE_ONE_RR(6,_r6, _tmp);; \
+	SAVE_ONE_RR(7,_r7, _tmp);;
+
+#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
+	st8 [ptr]=_r0, 8;; \
+	st8 [ptr]=_r1, 8;; \
+	st8 [ptr]=_r2, 8;; \
+	st8 [ptr]=_r3, 8;; \
+	st8 [ptr]=_r4, 8;; \
+	st8 [ptr]=_r5, 8;; \
+	st8 [ptr]=_r6, 8;; \
+	st8 [ptr]=_r7, 8;;
+
+#define RESTORE_REGION_REGS(ptr, _idx1, _idx2, _tmp) \
+	mov		ar.lc=0x08-1;;						\
+	movl	_idx1=0x00;;						\
+RestRR:											\
+	dep.z	_idx2=_idx1,61,3;;					\
+	ld8		_tmp=[ptr],8;;						\
+	mov		rr[_idx2]=_tmp;;					\
+	srlz.d;;									\
+	add		_idx1=1,_idx1;;						\
+	br.cloop.sptk.few	RestRR
+
+#define SET_AREA_FOR_BOOTING_CPU(reg1, reg2) \
+	movl reg1=sal_state_for_booting_cpu;;	\
+	ld8 reg2=[reg1];;
+
+/*
+ * Adjust region registers saved before starting to save
+ * break regs and rest of the states that need to be preserved.
+ */
+#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(_reg1,_reg2,_pred)  \
+	SAVE_FROM_REG(b0,_reg1,_reg2);;						\
+	SAVE_FROM_REG(b1,_reg1,_reg2);;						\
+	SAVE_FROM_REG(b2,_reg1,_reg2);;						\
+	SAVE_FROM_REG(b3,_reg1,_reg2);;						\
+	SAVE_FROM_REG(b4,_reg1,_reg2);;						\
+	SAVE_FROM_REG(b5,_reg1,_reg2);;						\
+	st8 [_reg1]=r1,0x08;;								\
+	st8 [_reg1]=r12,0x08;;								\
+	st8 [_reg1]=r13,0x08;;								\
+	SAVE_FROM_REG(ar.fpsr,_reg1,_reg2);;				\
+	SAVE_FROM_REG(ar.pfs,_reg1,_reg2);;					\
+	SAVE_FROM_REG(ar.rnat,_reg1,_reg2);;				\
+	SAVE_FROM_REG(ar.unat,_reg1,_reg2);;				\
+	SAVE_FROM_REG(ar.bspstore,_reg1,_reg2);;			\
+	SAVE_FROM_REG(cr.dcr,_reg1,_reg2);;					\
+	SAVE_FROM_REG(cr.iva,_reg1,_reg2);;					\
+	SAVE_FROM_REG(cr.pta,_reg1,_reg2);;					\
+	SAVE_FROM_REG(cr.itv,_reg1,_reg2);;					\
+	SAVE_FROM_REG(cr.pmv,_reg1,_reg2);;					\
+	SAVE_FROM_REG(cr.cmcv,_reg1,_reg2);;				\
+	SAVE_FROM_REG(cr.lrr0,_reg1,_reg2);;				\
+	SAVE_FROM_REG(cr.lrr1,_reg1,_reg2);;				\
+	st8 [_reg1]=r4,0x08;;								\
+	st8 [_reg1]=r5,0x08;;								\
+	st8 [_reg1]=r6,0x08;;								\
+	st8 [_reg1]=r7,0x08;;								\
+	st8 [_reg1]=_pred,0x08;;							\
+	SAVE_FROM_REG(ar.lc, _reg1, _reg2);;				\
+	stf.spill.nta [_reg1]=f2,16;;						\
+	stf.spill.nta [_reg1]=f3,16;;						\
+	stf.spill.nta [_reg1]=f4,16;;						\
+	stf.spill.nta [_reg1]=f5,16;;						\
+	stf.spill.nta [_reg1]=f16,16;;						\
+	stf.spill.nta [_reg1]=f17,16;;						\
+	stf.spill.nta [_reg1]=f18,16;;						\
+	stf.spill.nta [_reg1]=f19,16;;						\
+	stf.spill.nta [_reg1]=f20,16;;						\
+	stf.spill.nta [_reg1]=f21,16;;						\
+	stf.spill.nta [_reg1]=f22,16;;						\
+	stf.spill.nta [_reg1]=f23,16;;						\
+	stf.spill.nta [_reg1]=f24,16;;						\
+	stf.spill.nta [_reg1]=f25,16;;						\
+	stf.spill.nta [_reg1]=f26,16;;						\
+	stf.spill.nta [_reg1]=f27,16;;						\
+	stf.spill.nta [_reg1]=f28,16;;						\
+	stf.spill.nta [_reg1]=f29,16;;						\
+	stf.spill.nta [_reg1]=f30,16;;						\
+	stf.spill.nta [_reg1]=f31,16;;
+
+#else
+#define SET_AREA_FOR_BOOTING_CPU(a1, a2)
+#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(a1,a2, a3)
+#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
+#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
+#endif
+
+#define SET_ONE_RR(num, pgsize, _tmp1, _tmp2, vhpt) \
+	movl _tmp1=(num << 61);;	\
+	mov _tmp2=((ia64_rid(IA64_REGION_ID_KERNEL, (num<<61)) << 8) | (pgsize << 2) | vhpt);; \
+	mov rr[_tmp1]=_tmp2
+
+	__PAGE_ALIGNED_DATA
+
+	.global empty_zero_page
+EXPORT_DATA_SYMBOL_GPL(empty_zero_page)
+empty_zero_page:
+	.skip PAGE_SIZE
+
+	.global swapper_pg_dir
+swapper_pg_dir:
+	.skip PAGE_SIZE
+
+	.rodata
+halt_msg:
+	stringz "Halting kernel\n"
+
+	__REF
+
+	.global start_ap
+
+	/*
+	 * Start the kernel.  When the bootloader passes control to _start(), r28
+	 * points to the address of the boot parameter area.  Execution reaches
+	 * here in physical mode.
+	 */
+GLOBAL_ENTRY(_start)
+start_ap:
+	.prologue
+	.save rp, r0		// terminate unwind chain with a NULL rp
+	.body
+
+	rsm psr.i | psr.ic
+	;;
+	srlz.i
+	;;
+ {
+	flushrs				// must be first insn in group
+	srlz.i
+ }
+	;;
+	/*
+	 * Save the region registers, predicate before they get clobbered
+	 */
+	SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15);
+	mov r25=pr;;
+
+	/*
+	 * Initialize kernel region registers:
+	 *	rr[0]: VHPT enabled, page size = PAGE_SHIFT
+	 *	rr[1]: VHPT enabled, page size = PAGE_SHIFT
+	 *	rr[2]: VHPT enabled, page size = PAGE_SHIFT
+	 *	rr[3]: VHPT enabled, page size = PAGE_SHIFT
+	 *	rr[4]: VHPT enabled, page size = PAGE_SHIFT
+	 *	rr[5]: VHPT enabled, page size = PAGE_SHIFT
+	 *	rr[6]: VHPT disabled, page size = IA64_GRANULE_SHIFT
+	 *	rr[7]: VHPT disabled, page size = IA64_GRANULE_SHIFT
+	 * We initialize all of them to prevent inadvertently assuming
+	 * something about the state of address translation early in boot.
+	 */
+	SET_ONE_RR(0, PAGE_SHIFT, r2, r16, 1);;
+	SET_ONE_RR(1, PAGE_SHIFT, r2, r16, 1);;
+	SET_ONE_RR(2, PAGE_SHIFT, r2, r16, 1);;
+	SET_ONE_RR(3, PAGE_SHIFT, r2, r16, 1);;
+	SET_ONE_RR(4, PAGE_SHIFT, r2, r16, 1);;
+	SET_ONE_RR(5, PAGE_SHIFT, r2, r16, 1);;
+	SET_ONE_RR(6, IA64_GRANULE_SHIFT, r2, r16, 0);;
+	SET_ONE_RR(7, IA64_GRANULE_SHIFT, r2, r16, 0);;
+	/*
+	 * Now pin mappings into the TLB for kernel text and data
+	 */
+	mov r18=KERNEL_TR_PAGE_SHIFT<<2
+	movl r17=KERNEL_START
+	;;
+	mov cr.itir=r18
+	mov cr.ifa=r17
+	mov r16=IA64_TR_KERNEL
+	mov r3=ip
+	movl r18=PAGE_KERNEL
+	;;
+	dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
+	;;
+	or r18=r2,r18
+	;;
+	srlz.i
+	;;
+	itr.i itr[r16]=r18
+	;;
+	itr.d dtr[r16]=r18
+	;;
+	srlz.i
+
+	/*
+	 * Switch into virtual mode:
+	 */
+	movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \
+		  |IA64_PSR_DI)
+	;;
+	mov cr.ipsr=r16
+	movl r17=1f
+	;;
+	mov cr.iip=r17
+	mov cr.ifs=r0
+	;;
+	rfi
+	;;
+1:	// now we are in virtual mode
+
+	SET_AREA_FOR_BOOTING_CPU(r2, r16);
+
+	STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15);
+	SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25)
+	;;
+
+	// set IVT entry point---can't access I/O ports without it
+	movl r3=ia64_ivt
+	;;
+	mov cr.iva=r3
+	movl r2=FPSR_DEFAULT
+	;;
+	srlz.i
+	movl gp=__gp
+
+	mov ar.fpsr=r2
+	;;
+
+#define isAP	p2	// are we an Application Processor?
+#define isBP	p3	// are we the Bootstrap Processor?
+
+#ifdef CONFIG_SMP
+	/*
+	 * Find the init_task for the currently booting CPU.  At poweron, and in
+	 * UP mode, task_for_booting_cpu is NULL.
+	 */
+	movl r3=task_for_booting_cpu
+ 	;;
+	ld8 r3=[r3]
+	movl r2=init_task
+	;;
+	cmp.eq isBP,isAP=r3,r0
+	;;
+(isAP)	mov r2=r3
+#else
+	movl r2=init_task
+	cmp.eq isBP,isAP=r0,r0
+#endif
+	;;
+	tpa r3=r2		// r3 == phys addr of task struct
+	mov r16=-1
+(isBP)	br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it
+
+	// load mapping for stack (virtaddr in r2, physaddr in r3)
+	rsm psr.ic
+	movl r17=PAGE_KERNEL
+	;;
+	srlz.d
+	dep r18=0,r3,0,12
+	;;
+	or r18=r17,r18
+	dep r2=-1,r3,61,3	// IMVA of task
+	;;
+	mov r17=rr[r2]
+	shr.u r16=r3,IA64_GRANULE_SHIFT
+	;;
+	dep r17=0,r17,8,24
+	;;
+	mov cr.itir=r17
+	mov cr.ifa=r2
+
+	mov r19=IA64_TR_CURRENT_STACK
+	;;
+	itr.d dtr[r19]=r18
+	;;
+	ssm psr.ic
+	srlz.d
+  	;;
+
+.load_current:
+	// load the "current" pointer (r13) and ar.k6 with the current task
+	mov IA64_KR(CURRENT)=r2		// virtual address
+	mov IA64_KR(CURRENT_STACK)=r16
+	mov r13=r2
+	/*
+	 * Reserve space at the top of the stack for "struct pt_regs".  Kernel
+	 * threads don't store interesting values in that structure, but the space
+	 * still needs to be there because time-critical stuff such as the context
+	 * switching can be implemented more efficiently (for example, __switch_to()
+	 * always sets the psr.dfh bit of the task it is switching to).
+	 */
+
+	addl r12=IA64_STK_OFFSET-IA64_PT_REGS_SIZE-16,r2
+	addl r2=IA64_RBS_OFFSET,r2	// initialize the RSE
+	mov ar.rsc=0		// place RSE in enforced lazy mode
+	;;
+	loadrs			// clear the dirty partition
+	movl r19=__phys_per_cpu_start
+	mov r18=PERCPU_PAGE_SIZE
+	;;
+#ifndef CONFIG_SMP
+	add r19=r19,r18
+	;;
+#else
+(isAP)	br.few 2f
+	movl r20=__cpu0_per_cpu
+	;;
+	shr.u r18=r18,3
+1:
+	ld8 r21=[r19],8;;
+	st8[r20]=r21,8
+	adds r18=-1,r18;;
+	cmp4.lt p7,p6=0,r18
+(p7)	br.cond.dptk.few 1b
+	mov r19=r20
+	;;
+2:
+#endif
+	tpa r19=r19
+	;;
+	.pred.rel.mutex isBP,isAP
+(isBP)	mov IA64_KR(PER_CPU_DATA)=r19	// per-CPU base for cpu0
+(isAP)	mov IA64_KR(PER_CPU_DATA)=r0	// clear physical per-CPU base
+	;;
+	mov ar.bspstore=r2	// establish the new RSE stack
+	;;
+	mov ar.rsc=0x3		// place RSE in eager mode
+
+(isBP)	dep r28=-1,r28,61,3	// make address virtual
+(isBP)	movl r2=ia64_boot_param
+	;;
+(isBP)	st8 [r2]=r28		// save the address of the boot param area passed by the bootloader
+
+#ifdef CONFIG_SMP
+(isAP)	br.call.sptk.many rp=start_secondary
+.ret0:
+(isAP)	br.cond.sptk self
+#endif
+
+	// This is executed by the bootstrap processor (bsp) only:
+
+	br.call.sptk.many rp=start_kernel
+.ret2:	addl r3=@ltoff(halt_msg),gp
+	;;
+	alloc r2=ar.pfs,8,0,2,0
+	;;
+	ld8 out0=[r3]
+	br.call.sptk.many b0=console_print
+
+self:	hint @pause
+	br.sptk.many self		// endless loop
+END(_start)
+
+	.text
+
+GLOBAL_ENTRY(ia64_save_debug_regs)
+	alloc r16=ar.pfs,1,0,0,0
+	mov r20=ar.lc			// preserve ar.lc
+	mov ar.lc=IA64_NUM_DBG_REGS-1
+	mov r18=0
+	add r19=IA64_NUM_DBG_REGS*8,in0
+	;;
+1:	mov r16=dbr[r18]
+#ifdef CONFIG_ITANIUM
+	;;
+	srlz.d
+#endif
+	mov r17=ibr[r18]
+	add r18=1,r18
+	;;
+	st8.nta [in0]=r16,8
+	st8.nta [r19]=r17,8
+	br.cloop.sptk.many 1b
+	;;
+	mov ar.lc=r20			// restore ar.lc
+	br.ret.sptk.many rp
+END(ia64_save_debug_regs)
+
+GLOBAL_ENTRY(ia64_load_debug_regs)
+	alloc r16=ar.pfs,1,0,0,0
+	lfetch.nta [in0]
+	mov r20=ar.lc			// preserve ar.lc
+	add r19=IA64_NUM_DBG_REGS*8,in0
+	mov ar.lc=IA64_NUM_DBG_REGS-1
+	mov r18=-1
+	;;
+1:	ld8.nta r16=[in0],8
+	ld8.nta r17=[r19],8
+	add r18=1,r18
+	;;
+	mov dbr[r18]=r16
+#ifdef CONFIG_ITANIUM
+	;;
+	srlz.d				// Errata 132 (NoFix status)
+#endif
+	mov ibr[r18]=r17
+	br.cloop.sptk.many 1b
+	;;
+	mov ar.lc=r20			// restore ar.lc
+	br.ret.sptk.many rp
+END(ia64_load_debug_regs)
+
+GLOBAL_ENTRY(__ia64_save_fpu)
+	alloc r2=ar.pfs,1,4,0,0
+	adds loc0=96*16-16,in0
+	adds loc1=96*16-16-128,in0
+	;;
+	stf.spill.nta [loc0]=f127,-256
+	stf.spill.nta [loc1]=f119,-256
+	;;
+	stf.spill.nta [loc0]=f111,-256
+	stf.spill.nta [loc1]=f103,-256
+	;;
+	stf.spill.nta [loc0]=f95,-256
+	stf.spill.nta [loc1]=f87,-256
+	;;
+	stf.spill.nta [loc0]=f79,-256
+	stf.spill.nta [loc1]=f71,-256
+	;;
+	stf.spill.nta [loc0]=f63,-256
+	stf.spill.nta [loc1]=f55,-256
+	adds loc2=96*16-32,in0
+	;;
+	stf.spill.nta [loc0]=f47,-256
+	stf.spill.nta [loc1]=f39,-256
+	adds loc3=96*16-32-128,in0
+	;;
+	stf.spill.nta [loc2]=f126,-256
+	stf.spill.nta [loc3]=f118,-256
+	;;
+	stf.spill.nta [loc2]=f110,-256
+	stf.spill.nta [loc3]=f102,-256
+	;;
+	stf.spill.nta [loc2]=f94,-256
+	stf.spill.nta [loc3]=f86,-256
+	;;
+	stf.spill.nta [loc2]=f78,-256
+	stf.spill.nta [loc3]=f70,-256
+	;;
+	stf.spill.nta [loc2]=f62,-256
+	stf.spill.nta [loc3]=f54,-256
+	adds loc0=96*16-48,in0
+	;;
+	stf.spill.nta [loc2]=f46,-256
+	stf.spill.nta [loc3]=f38,-256
+	adds loc1=96*16-48-128,in0
+	;;
+	stf.spill.nta [loc0]=f125,-256
+	stf.spill.nta [loc1]=f117,-256
+	;;
+	stf.spill.nta [loc0]=f109,-256
+	stf.spill.nta [loc1]=f101,-256
+	;;
+	stf.spill.nta [loc0]=f93,-256
+	stf.spill.nta [loc1]=f85,-256
+	;;
+	stf.spill.nta [loc0]=f77,-256
+	stf.spill.nta [loc1]=f69,-256
+	;;
+	stf.spill.nta [loc0]=f61,-256
+	stf.spill.nta [loc1]=f53,-256
+	adds loc2=96*16-64,in0
+	;;
+	stf.spill.nta [loc0]=f45,-256
+	stf.spill.nta [loc1]=f37,-256
+	adds loc3=96*16-64-128,in0
+	;;
+	stf.spill.nta [loc2]=f124,-256
+	stf.spill.nta [loc3]=f116,-256
+	;;
+	stf.spill.nta [loc2]=f108,-256
+	stf.spill.nta [loc3]=f100,-256
+	;;
+	stf.spill.nta [loc2]=f92,-256
+	stf.spill.nta [loc3]=f84,-256
+	;;
+	stf.spill.nta [loc2]=f76,-256
+	stf.spill.nta [loc3]=f68,-256
+	;;
+	stf.spill.nta [loc2]=f60,-256
+	stf.spill.nta [loc3]=f52,-256
+	adds loc0=96*16-80,in0
+	;;
+	stf.spill.nta [loc2]=f44,-256
+	stf.spill.nta [loc3]=f36,-256
+	adds loc1=96*16-80-128,in0
+	;;
+	stf.spill.nta [loc0]=f123,-256
+	stf.spill.nta [loc1]=f115,-256
+	;;
+	stf.spill.nta [loc0]=f107,-256
+	stf.spill.nta [loc1]=f99,-256
+	;;
+	stf.spill.nta [loc0]=f91,-256
+	stf.spill.nta [loc1]=f83,-256
+	;;
+	stf.spill.nta [loc0]=f75,-256
+	stf.spill.nta [loc1]=f67,-256
+	;;
+	stf.spill.nta [loc0]=f59,-256
+	stf.spill.nta [loc1]=f51,-256
+	adds loc2=96*16-96,in0
+	;;
+	stf.spill.nta [loc0]=f43,-256
+	stf.spill.nta [loc1]=f35,-256
+	adds loc3=96*16-96-128,in0
+	;;
+	stf.spill.nta [loc2]=f122,-256
+	stf.spill.nta [loc3]=f114,-256
+	;;
+	stf.spill.nta [loc2]=f106,-256
+	stf.spill.nta [loc3]=f98,-256
+	;;
+	stf.spill.nta [loc2]=f90,-256
+	stf.spill.nta [loc3]=f82,-256
+	;;
+	stf.spill.nta [loc2]=f74,-256
+	stf.spill.nta [loc3]=f66,-256
+	;;
+	stf.spill.nta [loc2]=f58,-256
+	stf.spill.nta [loc3]=f50,-256
+	adds loc0=96*16-112,in0
+	;;
+	stf.spill.nta [loc2]=f42,-256
+	stf.spill.nta [loc3]=f34,-256
+	adds loc1=96*16-112-128,in0
+	;;
+	stf.spill.nta [loc0]=f121,-256
+	stf.spill.nta [loc1]=f113,-256
+	;;
+	stf.spill.nta [loc0]=f105,-256
+	stf.spill.nta [loc1]=f97,-256
+	;;
+	stf.spill.nta [loc0]=f89,-256
+	stf.spill.nta [loc1]=f81,-256
+	;;
+	stf.spill.nta [loc0]=f73,-256
+	stf.spill.nta [loc1]=f65,-256
+	;;
+	stf.spill.nta [loc0]=f57,-256
+	stf.spill.nta [loc1]=f49,-256
+	adds loc2=96*16-128,in0
+	;;
+	stf.spill.nta [loc0]=f41,-256
+	stf.spill.nta [loc1]=f33,-256
+	adds loc3=96*16-128-128,in0
+	;;
+	stf.spill.nta [loc2]=f120,-256
+	stf.spill.nta [loc3]=f112,-256
+	;;
+	stf.spill.nta [loc2]=f104,-256
+	stf.spill.nta [loc3]=f96,-256
+	;;
+	stf.spill.nta [loc2]=f88,-256
+	stf.spill.nta [loc3]=f80,-256
+	;;
+	stf.spill.nta [loc2]=f72,-256
+	stf.spill.nta [loc3]=f64,-256
+	;;
+	stf.spill.nta [loc2]=f56,-256
+	stf.spill.nta [loc3]=f48,-256
+	;;
+	stf.spill.nta [loc2]=f40
+	stf.spill.nta [loc3]=f32
+	br.ret.sptk.many rp
+END(__ia64_save_fpu)
+
+GLOBAL_ENTRY(__ia64_load_fpu)
+	alloc r2=ar.pfs,1,2,0,0
+	adds r3=128,in0
+	adds r14=256,in0
+	adds r15=384,in0
+	mov loc0=512
+	mov loc1=-1024+16
+	;;
+	ldf.fill.nta f32=[in0],loc0
+	ldf.fill.nta f40=[ r3],loc0
+	ldf.fill.nta f48=[r14],loc0
+	ldf.fill.nta f56=[r15],loc0
+	;;
+	ldf.fill.nta f64=[in0],loc0
+	ldf.fill.nta f72=[ r3],loc0
+	ldf.fill.nta f80=[r14],loc0
+	ldf.fill.nta f88=[r15],loc0
+	;;
+	ldf.fill.nta f96=[in0],loc1
+	ldf.fill.nta f104=[ r3],loc1
+	ldf.fill.nta f112=[r14],loc1
+	ldf.fill.nta f120=[r15],loc1
+	;;
+	ldf.fill.nta f33=[in0],loc0
+	ldf.fill.nta f41=[ r3],loc0
+	ldf.fill.nta f49=[r14],loc0
+	ldf.fill.nta f57=[r15],loc0
+	;;
+	ldf.fill.nta f65=[in0],loc0
+	ldf.fill.nta f73=[ r3],loc0
+	ldf.fill.nta f81=[r14],loc0
+	ldf.fill.nta f89=[r15],loc0
+	;;
+	ldf.fill.nta f97=[in0],loc1
+	ldf.fill.nta f105=[ r3],loc1
+	ldf.fill.nta f113=[r14],loc1
+	ldf.fill.nta f121=[r15],loc1
+	;;
+	ldf.fill.nta f34=[in0],loc0
+	ldf.fill.nta f42=[ r3],loc0
+	ldf.fill.nta f50=[r14],loc0
+	ldf.fill.nta f58=[r15],loc0
+	;;
+	ldf.fill.nta f66=[in0],loc0
+	ldf.fill.nta f74=[ r3],loc0
+	ldf.fill.nta f82=[r14],loc0
+	ldf.fill.nta f90=[r15],loc0
+	;;
+	ldf.fill.nta f98=[in0],loc1
+	ldf.fill.nta f106=[ r3],loc1
+	ldf.fill.nta f114=[r14],loc1
+	ldf.fill.nta f122=[r15],loc1
+	;;
+	ldf.fill.nta f35=[in0],loc0
+	ldf.fill.nta f43=[ r3],loc0
+	ldf.fill.nta f51=[r14],loc0
+	ldf.fill.nta f59=[r15],loc0
+	;;
+	ldf.fill.nta f67=[in0],loc0
+	ldf.fill.nta f75=[ r3],loc0
+	ldf.fill.nta f83=[r14],loc0
+	ldf.fill.nta f91=[r15],loc0
+	;;
+	ldf.fill.nta f99=[in0],loc1
+	ldf.fill.nta f107=[ r3],loc1
+	ldf.fill.nta f115=[r14],loc1
+	ldf.fill.nta f123=[r15],loc1
+	;;
+	ldf.fill.nta f36=[in0],loc0
+	ldf.fill.nta f44=[ r3],loc0
+	ldf.fill.nta f52=[r14],loc0
+	ldf.fill.nta f60=[r15],loc0
+	;;
+	ldf.fill.nta f68=[in0],loc0
+	ldf.fill.nta f76=[ r3],loc0
+	ldf.fill.nta f84=[r14],loc0
+	ldf.fill.nta f92=[r15],loc0
+	;;
+	ldf.fill.nta f100=[in0],loc1
+	ldf.fill.nta f108=[ r3],loc1
+	ldf.fill.nta f116=[r14],loc1
+	ldf.fill.nta f124=[r15],loc1
+	;;
+	ldf.fill.nta f37=[in0],loc0
+	ldf.fill.nta f45=[ r3],loc0
+	ldf.fill.nta f53=[r14],loc0
+	ldf.fill.nta f61=[r15],loc0
+	;;
+	ldf.fill.nta f69=[in0],loc0
+	ldf.fill.nta f77=[ r3],loc0
+	ldf.fill.nta f85=[r14],loc0
+	ldf.fill.nta f93=[r15],loc0
+	;;
+	ldf.fill.nta f101=[in0],loc1
+	ldf.fill.nta f109=[ r3],loc1
+	ldf.fill.nta f117=[r14],loc1
+	ldf.fill.nta f125=[r15],loc1
+	;;
+	ldf.fill.nta f38 =[in0],loc0
+	ldf.fill.nta f46 =[ r3],loc0
+	ldf.fill.nta f54 =[r14],loc0
+	ldf.fill.nta f62 =[r15],loc0
+	;;
+	ldf.fill.nta f70 =[in0],loc0
+	ldf.fill.nta f78 =[ r3],loc0
+	ldf.fill.nta f86 =[r14],loc0
+	ldf.fill.nta f94 =[r15],loc0
+	;;
+	ldf.fill.nta f102=[in0],loc1
+	ldf.fill.nta f110=[ r3],loc1
+	ldf.fill.nta f118=[r14],loc1
+	ldf.fill.nta f126=[r15],loc1
+	;;
+	ldf.fill.nta f39 =[in0],loc0
+	ldf.fill.nta f47 =[ r3],loc0
+	ldf.fill.nta f55 =[r14],loc0
+	ldf.fill.nta f63 =[r15],loc0
+	;;
+	ldf.fill.nta f71 =[in0],loc0
+	ldf.fill.nta f79 =[ r3],loc0
+	ldf.fill.nta f87 =[r14],loc0
+	ldf.fill.nta f95 =[r15],loc0
+	;;
+	ldf.fill.nta f103=[in0]
+	ldf.fill.nta f111=[ r3]
+	ldf.fill.nta f119=[r14]
+	ldf.fill.nta f127=[r15]
+	br.ret.sptk.many rp
+END(__ia64_load_fpu)
+
+GLOBAL_ENTRY(__ia64_init_fpu)
+	stf.spill [sp]=f0		// M3
+	mov	 f32=f0			// F
+	nop.b	 0
+
+	ldfps	 f33,f34=[sp]		// M0
+	ldfps	 f35,f36=[sp]		// M1
+	mov      f37=f0			// F
+	;;
+
+	setf.s	 f38=r0			// M2
+	setf.s	 f39=r0			// M3
+	mov      f40=f0			// F
+
+	ldfps	 f41,f42=[sp]		// M0
+	ldfps	 f43,f44=[sp]		// M1
+	mov      f45=f0			// F
+
+	setf.s	 f46=r0			// M2
+	setf.s	 f47=r0			// M3
+	mov      f48=f0			// F
+
+	ldfps	 f49,f50=[sp]		// M0
+	ldfps	 f51,f52=[sp]		// M1
+	mov      f53=f0			// F
+
+	setf.s	 f54=r0			// M2
+	setf.s	 f55=r0			// M3
+	mov      f56=f0			// F
+
+	ldfps	 f57,f58=[sp]		// M0
+	ldfps	 f59,f60=[sp]		// M1
+	mov      f61=f0			// F
+
+	setf.s	 f62=r0			// M2
+	setf.s	 f63=r0			// M3
+	mov      f64=f0			// F
+
+	ldfps	 f65,f66=[sp]		// M0
+	ldfps	 f67,f68=[sp]		// M1
+	mov      f69=f0			// F
+
+	setf.s	 f70=r0			// M2
+	setf.s	 f71=r0			// M3
+	mov      f72=f0			// F
+
+	ldfps	 f73,f74=[sp]		// M0
+	ldfps	 f75,f76=[sp]		// M1
+	mov      f77=f0			// F
+
+	setf.s	 f78=r0			// M2
+	setf.s	 f79=r0			// M3
+	mov      f80=f0			// F
+
+	ldfps	 f81,f82=[sp]		// M0
+	ldfps	 f83,f84=[sp]		// M1
+	mov      f85=f0			// F
+
+	setf.s	 f86=r0			// M2
+	setf.s	 f87=r0			// M3
+	mov      f88=f0			// F
+
+	/*
+	 * When the instructions are cached, it would be faster to initialize
+	 * the remaining registers with simply mov instructions (F-unit).
+	 * This gets the time down to ~29 cycles.  However, this would use up
+	 * 33 bundles, whereas continuing with the above pattern yields
+	 * 10 bundles and ~30 cycles.
+	 */
+
+	ldfps	 f89,f90=[sp]		// M0
+	ldfps	 f91,f92=[sp]		// M1
+	mov      f93=f0			// F
+
+	setf.s	 f94=r0			// M2
+	setf.s	 f95=r0			// M3
+	mov      f96=f0			// F
+
+	ldfps	 f97,f98=[sp]		// M0
+	ldfps	 f99,f100=[sp]		// M1
+	mov      f101=f0		// F
+
+	setf.s	 f102=r0		// M2
+	setf.s	 f103=r0		// M3
+	mov      f104=f0		// F
+
+	ldfps	 f105,f106=[sp]		// M0
+	ldfps	 f107,f108=[sp]		// M1
+	mov      f109=f0		// F
+
+	setf.s	 f110=r0		// M2
+	setf.s	 f111=r0		// M3
+	mov      f112=f0		// F
+
+	ldfps	 f113,f114=[sp]		// M0
+	ldfps	 f115,f116=[sp]		// M1
+	mov      f117=f0		// F
+
+	setf.s	 f118=r0		// M2
+	setf.s	 f119=r0		// M3
+	mov      f120=f0		// F
+
+	ldfps	 f121,f122=[sp]		// M0
+	ldfps	 f123,f124=[sp]		// M1
+	mov      f125=f0		// F
+
+	setf.s	 f126=r0		// M2
+	setf.s	 f127=r0		// M3
+	br.ret.sptk.many rp		// F
+END(__ia64_init_fpu)
+
+/*
+ * Switch execution mode from virtual to physical
+ *
+ * Inputs:
+ *	r16 = new psr to establish
+ * Output:
+ *	r19 = old virtual address of ar.bsp
+ *	r20 = old virtual address of sp
+ *
+ * Note: RSE must already be in enforced lazy mode
+ */
+GLOBAL_ENTRY(ia64_switch_mode_phys)
+ {
+	rsm psr.i | psr.ic		// disable interrupts and interrupt collection
+	mov r15=ip
+ }
+	;;
+ {
+	flushrs				// must be first insn in group
+	srlz.i
+ }
+	;;
+	mov cr.ipsr=r16			// set new PSR
+	add r3=1f-ia64_switch_mode_phys,r15
+
+	mov r19=ar.bsp
+	mov r20=sp
+	mov r14=rp			// get return address into a general register
+	;;
+
+	// going to physical mode, use tpa to translate virt->phys
+	tpa r17=r19
+	tpa r3=r3
+	tpa sp=sp
+	tpa r14=r14
+	;;
+
+	mov r18=ar.rnat			// save ar.rnat
+	mov ar.bspstore=r17		// this steps on ar.rnat
+	mov cr.iip=r3
+	mov cr.ifs=r0
+	;;
+	mov ar.rnat=r18			// restore ar.rnat
+	rfi				// must be last insn in group
+	;;
+1:	mov rp=r14
+	br.ret.sptk.many rp
+END(ia64_switch_mode_phys)
+
+/*
+ * Switch execution mode from physical to virtual
+ *
+ * Inputs:
+ *	r16 = new psr to establish
+ *	r19 = new bspstore to establish
+ *	r20 = new sp to establish
+ *
+ * Note: RSE must already be in enforced lazy mode
+ */
+GLOBAL_ENTRY(ia64_switch_mode_virt)
+ {
+	rsm psr.i | psr.ic		// disable interrupts and interrupt collection
+	mov r15=ip
+ }
+	;;
+ {
+	flushrs				// must be first insn in group
+	srlz.i
+ }
+	;;
+	mov cr.ipsr=r16			// set new PSR
+	add r3=1f-ia64_switch_mode_virt,r15
+
+	mov r14=rp			// get return address into a general register
+	;;
+
+	// going to virtual
+	//   - for code addresses, set upper bits of addr to KERNEL_START
+	//   - for stack addresses, copy from input argument
+	movl r18=KERNEL_START
+	dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
+	dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
+	mov sp=r20
+	;;
+	or r3=r3,r18
+	or r14=r14,r18
+	;;
+
+	mov r18=ar.rnat			// save ar.rnat
+	mov ar.bspstore=r19		// this steps on ar.rnat
+	mov cr.iip=r3
+	mov cr.ifs=r0
+	;;
+	mov ar.rnat=r18			// restore ar.rnat
+	rfi				// must be last insn in group
+	;;
+1:	mov rp=r14
+	br.ret.sptk.many rp
+END(ia64_switch_mode_virt)
+
+GLOBAL_ENTRY(ia64_delay_loop)
+	.prologue
+{	nop 0			// work around GAS unwind info generation bug...
+	.save ar.lc,r2
+	mov r2=ar.lc
+	.body
+	;;
+	mov ar.lc=r32
+}
+	;;
+	// force loop to be 32-byte aligned (GAS bug means we cannot use .align
+	// inside function body without corrupting unwind info).
+{	nop 0 }
+1:	br.cloop.sptk.few 1b
+	;;
+	mov ar.lc=r2
+	br.ret.sptk.many rp
+END(ia64_delay_loop)
+
+/*
+ * Return a CPU-local timestamp in nano-seconds.  This timestamp is
+ * NOT synchronized across CPUs its return value must never be
+ * compared against the values returned on another CPU.  The usage in
+ * kernel/sched/core.c ensures that.
+ *
+ * The return-value of sched_clock() is NOT supposed to wrap-around.
+ * If it did, it would cause some scheduling hiccups (at the worst).
+ * Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even
+ * that would happen only once every 5+ years.
+ *
+ * The code below basically calculates:
+ *
+ *   (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT
+ *
+ * except that the multiplication and the shift are done with 128-bit
+ * intermediate precision so that we can produce a full 64-bit result.
+ */
+GLOBAL_ENTRY(ia64_native_sched_clock)
+	addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
+	mov.m r9=ar.itc		// fetch cycle-counter				(35 cyc)
+	;;
+	ldf8 f8=[r8]
+	;;
+	setf.sig f9=r9		// certain to stall, so issue it _after_ ldf8...
+	;;
+	xmpy.lu f10=f9,f8	// calculate low 64 bits of 128-bit product	(4 cyc)
+	xmpy.hu f11=f9,f8	// calculate high 64 bits of 128-bit product
+	;;
+	getf.sig r8=f10		//						(5 cyc)
+	getf.sig r9=f11
+	;;
+	shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
+	br.ret.sptk.many rp
+END(ia64_native_sched_clock)
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+GLOBAL_ENTRY(cycle_to_nsec)
+	alloc r16=ar.pfs,1,0,0,0
+	addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
+	;;
+	ldf8 f8=[r8]
+	;;
+	setf.sig f9=r32
+	;;
+	xmpy.lu f10=f9,f8	// calculate low 64 bits of 128-bit product	(4 cyc)
+	xmpy.hu f11=f9,f8	// calculate high 64 bits of 128-bit product
+	;;
+	getf.sig r8=f10		//						(5 cyc)
+	getf.sig r9=f11
+	;;
+	shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
+	br.ret.sptk.many rp
+END(cycle_to_nsec)
+#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
+
+#ifdef CONFIG_IA64_BRL_EMU
+
+/*
+ *  Assembly routines used by brl_emu.c to set preserved register state.
+ */
+
+#define SET_REG(reg)				\
+ GLOBAL_ENTRY(ia64_set_##reg);			\
+	alloc r16=ar.pfs,1,0,0,0;		\
+	mov reg=r32;				\
+	;;					\
+	br.ret.sptk.many rp;			\
+ END(ia64_set_##reg)
+
+SET_REG(b1);
+SET_REG(b2);
+SET_REG(b3);
+SET_REG(b4);
+SET_REG(b5);
+
+#endif /* CONFIG_IA64_BRL_EMU */
+
+#ifdef CONFIG_SMP
+
+#ifdef CONFIG_HOTPLUG_CPU
+GLOBAL_ENTRY(ia64_jump_to_sal)
+	alloc r16=ar.pfs,1,0,0,0;;
+	rsm psr.i  | psr.ic
+{
+	flushrs
+	srlz.i
+}
+	tpa r25=in0
+	movl r18=tlb_purge_done;;
+	DATA_VA_TO_PA(r18);;
+	mov b1=r18 	// Return location
+	movl r18=ia64_do_tlb_purge;;
+	DATA_VA_TO_PA(r18);;
+	mov b2=r18 	// doing tlb_flush work
+	mov ar.rsc=0  // Put RSE  in enforced lazy, LE mode
+	movl r17=1f;;
+	DATA_VA_TO_PA(r17);;
+	mov cr.iip=r17
+	movl r16=SAL_PSR_BITS_TO_SET;;
+	mov cr.ipsr=r16
+	mov cr.ifs=r0;;
+	rfi;;			// note: this unmask MCA/INIT (psr.mc)
+1:
+	/*
+	 * Invalidate all TLB data/inst
+	 */
+	br.sptk.many b2;; // jump to tlb purge code
+
+tlb_purge_done:
+	RESTORE_REGION_REGS(r25, r17,r18,r19);;
+	RESTORE_REG(b0, r25, r17);;
+	RESTORE_REG(b1, r25, r17);;
+	RESTORE_REG(b2, r25, r17);;
+	RESTORE_REG(b3, r25, r17);;
+	RESTORE_REG(b4, r25, r17);;
+	RESTORE_REG(b5, r25, r17);;
+	ld8 r1=[r25],0x08;;
+	ld8 r12=[r25],0x08;;
+	ld8 r13=[r25],0x08;;
+	RESTORE_REG(ar.fpsr, r25, r17);;
+	RESTORE_REG(ar.pfs, r25, r17);;
+	RESTORE_REG(ar.rnat, r25, r17);;
+	RESTORE_REG(ar.unat, r25, r17);;
+	RESTORE_REG(ar.bspstore, r25, r17);;
+	RESTORE_REG(cr.dcr, r25, r17);;
+	RESTORE_REG(cr.iva, r25, r17);;
+	RESTORE_REG(cr.pta, r25, r17);;
+	srlz.d;;	// required not to violate RAW dependency
+	RESTORE_REG(cr.itv, r25, r17);;
+	RESTORE_REG(cr.pmv, r25, r17);;
+	RESTORE_REG(cr.cmcv, r25, r17);;
+	RESTORE_REG(cr.lrr0, r25, r17);;
+	RESTORE_REG(cr.lrr1, r25, r17);;
+	ld8 r4=[r25],0x08;;
+	ld8 r5=[r25],0x08;;
+	ld8 r6=[r25],0x08;;
+	ld8 r7=[r25],0x08;;
+	ld8 r17=[r25],0x08;;
+	mov pr=r17,-1;;
+	RESTORE_REG(ar.lc, r25, r17);;
+	/*
+	 * Now Restore floating point regs
+	 */
+	ldf.fill.nta f2=[r25],16;;
+	ldf.fill.nta f3=[r25],16;;
+	ldf.fill.nta f4=[r25],16;;
+	ldf.fill.nta f5=[r25],16;;
+	ldf.fill.nta f16=[r25],16;;
+	ldf.fill.nta f17=[r25],16;;
+	ldf.fill.nta f18=[r25],16;;
+	ldf.fill.nta f19=[r25],16;;
+	ldf.fill.nta f20=[r25],16;;
+	ldf.fill.nta f21=[r25],16;;
+	ldf.fill.nta f22=[r25],16;;
+	ldf.fill.nta f23=[r25],16;;
+	ldf.fill.nta f24=[r25],16;;
+	ldf.fill.nta f25=[r25],16;;
+	ldf.fill.nta f26=[r25],16;;
+	ldf.fill.nta f27=[r25],16;;
+	ldf.fill.nta f28=[r25],16;;
+	ldf.fill.nta f29=[r25],16;;
+	ldf.fill.nta f30=[r25],16;;
+	ldf.fill.nta f31=[r25],16;;
+
+	/*
+	 * Now that we have done all the register restores
+	 * we are now ready for the big DIVE to SAL Land
+	 */
+	ssm psr.ic;;
+	srlz.d;;
+	br.ret.sptk.many b0;;
+END(ia64_jump_to_sal)
+#endif /* CONFIG_HOTPLUG_CPU */
+
+#endif /* CONFIG_SMP */
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
new file mode 100644
index 000000000..99300850a
--- /dev/null
+++ b/arch/ia64/kernel/iosapic.c
@@ -0,0 +1,1137 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * I/O SAPIC support.
+ *
+ * Copyright (C) 1999 Intel Corp.
+ * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
+ * Copyright (C) 2000-2002 J.I. Lee <jung-ik.lee@intel.com>
+ * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co.
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
+ *
+ * 00/04/19	D. Mosberger	Rewritten to mirror more closely the x86 I/O
+ *				APIC code.  In particular, we now have separate
+ *				handlers for edge and level triggered
+ *				interrupts.
+ * 00/10/27	Asit Mallick, Goutham Rao <goutham.rao@intel.com> IRQ vector
+ *				allocation PCI to vector mapping, shared PCI
+ *				interrupts.
+ * 00/10/27	D. Mosberger	Document things a bit more to make them more
+ *				understandable.  Clean up much of the old
+ *				IOSAPIC cruft.
+ * 01/07/27	J.I. Lee	PCI irq routing, Platform/Legacy interrupts
+ *				and fixes for ACPI S5(SoftOff) support.
+ * 02/01/23	J.I. Lee	iosapic pgm fixes for PCI irq routing from _PRT
+ * 02/01/07     E. Focht        <efocht@ess.nec.de> Redirectable interrupt
+ *				vectors in iosapic_set_affinity(),
+ *				initializations for /proc/irq/#/smp_affinity
+ * 02/04/02	P. Diefenbaugh	Cleaned up ACPI PCI IRQ routing.
+ * 02/04/18	J.I. Lee	bug fix in iosapic_init_pci_irq
+ * 02/04/30	J.I. Lee	bug fix in find_iosapic to fix ACPI PCI IRQ to
+ *				IOSAPIC mapping error
+ * 02/07/29	T. Kochi	Allocate interrupt vectors dynamically
+ * 02/08/04	T. Kochi	Cleaned up terminology (irq, global system
+ *				interrupt, vector, etc.)
+ * 02/09/20	D. Mosberger	Simplified by taking advantage of ACPI's
+ *				pci_irq code.
+ * 03/02/19	B. Helgaas	Make pcat_compat system-wide, not per-IOSAPIC.
+ *				Remove iosapic_address & gsi_base from
+ *				external interfaces.  Rationalize
+ *				__init/__devinit attributes.
+ * 04/12/04 Ashok Raj	<ashok.raj@intel.com> Intel Corporation 2004
+ *				Updated to work with irq migration necessary
+ *				for CPU Hotplug
+ */
+/*
+ * Here is what the interrupt logic between a PCI device and the kernel looks
+ * like:
+ *
+ * (1) A PCI device raises one of the four interrupt pins (INTA, INTB, INTC,
+ *     INTD).  The device is uniquely identified by its bus-, and slot-number
+ *     (the function number does not matter here because all functions share
+ *     the same interrupt lines).
+ *
+ * (2) The motherboard routes the interrupt line to a pin on a IOSAPIC
+ *     controller.  Multiple interrupt lines may have to share the same
+ *     IOSAPIC pin (if they're level triggered and use the same polarity).
+ *     Each interrupt line has a unique Global System Interrupt (GSI) number
+ *     which can be calculated as the sum of the controller's base GSI number
+ *     and the IOSAPIC pin number to which the line connects.
+ *
+ * (3) The IOSAPIC uses an internal routing table entries (RTEs) to map the
+ * IOSAPIC pin into the IA-64 interrupt vector.  This interrupt vector is then
+ * sent to the CPU.
+ *
+ * (4) The kernel recognizes an interrupt as an IRQ.  The IRQ interface is
+ *     used as architecture-independent interrupt handling mechanism in Linux.
+ *     As an IRQ is a number, we have to have
+ *     IA-64 interrupt vector number <-> IRQ number mapping.  On smaller
+ *     systems, we use one-to-one mapping between IA-64 vector and IRQ.
+ *
+ * To sum up, there are three levels of mappings involved:
+ *
+ *	PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ
+ *
+ * Note: The term "IRQ" is loosely used everywhere in Linux kernel to
+ * describe interrupts.  Now we use "IRQ" only for Linux IRQ's.  ISA IRQ
+ * (isa_irq) is the only exception in this source code.
+ */
+
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <linux/memblock.h>
+
+#include <asm/delay.h>
+#include <asm/hw_irq.h>
+#include <asm/io.h>
+#include <asm/iosapic.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/xtp.h>
+
+#undef DEBUG_INTERRUPT_ROUTING
+
+#ifdef DEBUG_INTERRUPT_ROUTING
+#define DBG(fmt...)	printk(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+static DEFINE_SPINLOCK(iosapic_lock);
+
+/*
+ * These tables map IA-64 vectors to the IOSAPIC pin that generates this
+ * vector.
+ */
+
+#define NO_REF_RTE	0
+
+static struct iosapic {
+	char __iomem	*addr;		/* base address of IOSAPIC */
+	unsigned int	gsi_base;	/* GSI base */
+	unsigned short	num_rte;	/* # of RTEs on this IOSAPIC */
+	int		rtes_inuse;	/* # of RTEs in use on this IOSAPIC */
+#ifdef CONFIG_NUMA
+	unsigned short	node;		/* numa node association via pxm */
+#endif
+	spinlock_t	lock;		/* lock for indirect reg access */
+} iosapic_lists[NR_IOSAPICS];
+
+struct iosapic_rte_info {
+	struct list_head rte_list;	/* RTEs sharing the same vector */
+	char		rte_index;	/* IOSAPIC RTE index */
+	int		refcnt;		/* reference counter */
+	struct iosapic	*iosapic;
+} ____cacheline_aligned;
+
+static struct iosapic_intr_info {
+	struct list_head rtes;		/* RTEs using this vector (empty =>
+					 * not an IOSAPIC interrupt) */
+	int		count;		/* # of registered RTEs */
+	u32		low32;		/* current value of low word of
+					 * Redirection table entry */
+	unsigned int	dest;		/* destination CPU physical ID */
+	unsigned char	dmode	: 3;	/* delivery mode (see iosapic.h) */
+	unsigned char 	polarity: 1;	/* interrupt polarity
+					 * (see iosapic.h) */
+	unsigned char	trigger	: 1;	/* trigger mode (see iosapic.h) */
+} iosapic_intr_info[NR_IRQS];
+
+static unsigned char pcat_compat;	/* 8259 compatibility flag */
+
+static inline void
+iosapic_write(struct iosapic *iosapic, unsigned int reg, u32 val)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&iosapic->lock, flags);
+	__iosapic_write(iosapic->addr, reg, val);
+	spin_unlock_irqrestore(&iosapic->lock, flags);
+}
+
+/*
+ * Find an IOSAPIC associated with a GSI
+ */
+static inline int
+find_iosapic (unsigned int gsi)
+{
+	int i;
+
+	for (i = 0; i < NR_IOSAPICS; i++) {
+		if ((unsigned) (gsi - iosapic_lists[i].gsi_base) <
+		    iosapic_lists[i].num_rte)
+			return i;
+	}
+
+	return -1;
+}
+
+static inline int __gsi_to_irq(unsigned int gsi)
+{
+	int irq;
+	struct iosapic_intr_info *info;
+	struct iosapic_rte_info *rte;
+
+	for (irq = 0; irq < NR_IRQS; irq++) {
+		info = &iosapic_intr_info[irq];
+		list_for_each_entry(rte, &info->rtes, rte_list)
+			if (rte->iosapic->gsi_base + rte->rte_index == gsi)
+				return irq;
+	}
+	return -1;
+}
+
+int
+gsi_to_irq (unsigned int gsi)
+{
+	unsigned long flags;
+	int irq;
+
+	spin_lock_irqsave(&iosapic_lock, flags);
+	irq = __gsi_to_irq(gsi);
+	spin_unlock_irqrestore(&iosapic_lock, flags);
+	return irq;
+}
+
+static struct iosapic_rte_info *find_rte(unsigned int irq, unsigned int gsi)
+{
+	struct iosapic_rte_info *rte;
+
+	list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list)
+		if (rte->iosapic->gsi_base + rte->rte_index == gsi)
+			return rte;
+	return NULL;
+}
+
+static void
+set_rte (unsigned int gsi, unsigned int irq, unsigned int dest, int mask)
+{
+	unsigned long pol, trigger, dmode;
+	u32 low32, high32;
+	int rte_index;
+	char redir;
+	struct iosapic_rte_info *rte;
+	ia64_vector vector = irq_to_vector(irq);
+
+	DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest);
+
+	rte = find_rte(irq, gsi);
+	if (!rte)
+		return;		/* not an IOSAPIC interrupt */
+
+	rte_index = rte->rte_index;
+	pol     = iosapic_intr_info[irq].polarity;
+	trigger = iosapic_intr_info[irq].trigger;
+	dmode   = iosapic_intr_info[irq].dmode;
+
+	redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0;
+
+#ifdef CONFIG_SMP
+	set_irq_affinity_info(irq, (int)(dest & 0xffff), redir);
+#endif
+
+	low32 = ((pol << IOSAPIC_POLARITY_SHIFT) |
+		 (trigger << IOSAPIC_TRIGGER_SHIFT) |
+		 (dmode << IOSAPIC_DELIVERY_SHIFT) |
+		 ((mask ? 1 : 0) << IOSAPIC_MASK_SHIFT) |
+		 vector);
+
+	/* dest contains both id and eid */
+	high32 = (dest << IOSAPIC_DEST_SHIFT);
+
+	iosapic_write(rte->iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
+	iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
+	iosapic_intr_info[irq].low32 = low32;
+	iosapic_intr_info[irq].dest = dest;
+}
+
+static void
+iosapic_nop (struct irq_data *data)
+{
+	/* do nothing... */
+}
+
+
+#ifdef CONFIG_KEXEC
+void
+kexec_disable_iosapic(void)
+{
+	struct iosapic_intr_info *info;
+	struct iosapic_rte_info *rte;
+	ia64_vector vec;
+	int irq;
+
+	for (irq = 0; irq < NR_IRQS; irq++) {
+		info = &iosapic_intr_info[irq];
+		vec = irq_to_vector(irq);
+		list_for_each_entry(rte, &info->rtes,
+				rte_list) {
+			iosapic_write(rte->iosapic,
+					IOSAPIC_RTE_LOW(rte->rte_index),
+					IOSAPIC_MASK|vec);
+			iosapic_eoi(rte->iosapic->addr, vec);
+		}
+	}
+}
+#endif
+
+static void
+mask_irq (struct irq_data *data)
+{
+	unsigned int irq = data->irq;
+	u32 low32;
+	int rte_index;
+	struct iosapic_rte_info *rte;
+
+	if (!iosapic_intr_info[irq].count)
+		return;			/* not an IOSAPIC interrupt! */
+
+	/* set only the mask bit */
+	low32 = iosapic_intr_info[irq].low32 |= IOSAPIC_MASK;
+	list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
+		rte_index = rte->rte_index;
+		iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
+	}
+}
+
+static void
+unmask_irq (struct irq_data *data)
+{
+	unsigned int irq = data->irq;
+	u32 low32;
+	int rte_index;
+	struct iosapic_rte_info *rte;
+
+	if (!iosapic_intr_info[irq].count)
+		return;			/* not an IOSAPIC interrupt! */
+
+	low32 = iosapic_intr_info[irq].low32 &= ~IOSAPIC_MASK;
+	list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
+		rte_index = rte->rte_index;
+		iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
+	}
+}
+
+
+static int
+iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
+		     bool force)
+{
+#ifdef CONFIG_SMP
+	unsigned int irq = data->irq;
+	u32 high32, low32;
+	int cpu, dest, rte_index;
+	int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0;
+	struct iosapic_rte_info *rte;
+	struct iosapic *iosapic;
+
+	irq &= (~IA64_IRQ_REDIRECTED);
+
+	cpu = cpumask_first_and(cpu_online_mask, mask);
+	if (cpu >= nr_cpu_ids)
+		return -1;
+
+	if (irq_prepare_move(irq, cpu))
+		return -1;
+
+	dest = cpu_physical_id(cpu);
+
+	if (!iosapic_intr_info[irq].count)
+		return -1;			/* not an IOSAPIC interrupt */
+
+	set_irq_affinity_info(irq, dest, redir);
+
+	/* dest contains both id and eid */
+	high32 = dest << IOSAPIC_DEST_SHIFT;
+
+	low32 = iosapic_intr_info[irq].low32 & ~(7 << IOSAPIC_DELIVERY_SHIFT);
+	if (redir)
+		/* change delivery mode to lowest priority */
+		low32 |= (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
+	else
+		/* change delivery mode to fixed */
+		low32 |= (IOSAPIC_FIXED << IOSAPIC_DELIVERY_SHIFT);
+	low32 &= IOSAPIC_VECTOR_MASK;
+	low32 |= irq_to_vector(irq);
+
+	iosapic_intr_info[irq].low32 = low32;
+	iosapic_intr_info[irq].dest = dest;
+	list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
+		iosapic = rte->iosapic;
+		rte_index = rte->rte_index;
+		iosapic_write(iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
+		iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
+	}
+
+#endif
+	return 0;
+}
+
+/*
+ * Handlers for level-triggered interrupts.
+ */
+
+static unsigned int
+iosapic_startup_level_irq (struct irq_data *data)
+{
+	unmask_irq(data);
+	return 0;
+}
+
+static void
+iosapic_unmask_level_irq (struct irq_data *data)
+{
+	unsigned int irq = data->irq;
+	ia64_vector vec = irq_to_vector(irq);
+	struct iosapic_rte_info *rte;
+	int do_unmask_irq = 0;
+
+	irq_complete_move(irq);
+	if (unlikely(irqd_is_setaffinity_pending(data))) {
+		do_unmask_irq = 1;
+		mask_irq(data);
+	} else
+		unmask_irq(data);
+
+	list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list)
+		iosapic_eoi(rte->iosapic->addr, vec);
+
+	if (unlikely(do_unmask_irq)) {
+		irq_move_masked_irq(data);
+		unmask_irq(data);
+	}
+}
+
+#define iosapic_shutdown_level_irq	mask_irq
+#define iosapic_enable_level_irq	unmask_irq
+#define iosapic_disable_level_irq	mask_irq
+#define iosapic_ack_level_irq		iosapic_nop
+
+static struct irq_chip irq_type_iosapic_level = {
+	.name =			"IO-SAPIC-level",
+	.irq_startup =		iosapic_startup_level_irq,
+	.irq_shutdown =		iosapic_shutdown_level_irq,
+	.irq_enable =		iosapic_enable_level_irq,
+	.irq_disable =		iosapic_disable_level_irq,
+	.irq_ack =		iosapic_ack_level_irq,
+	.irq_mask =		mask_irq,
+	.irq_unmask =		iosapic_unmask_level_irq,
+	.irq_set_affinity =	iosapic_set_affinity
+};
+
+/*
+ * Handlers for edge-triggered interrupts.
+ */
+
+static unsigned int
+iosapic_startup_edge_irq (struct irq_data *data)
+{
+	unmask_irq(data);
+	/*
+	 * IOSAPIC simply drops interrupts pended while the
+	 * corresponding pin was masked, so we can't know if an
+	 * interrupt is pending already.  Let's hope not...
+	 */
+	return 0;
+}
+
+static void
+iosapic_ack_edge_irq (struct irq_data *data)
+{
+	irq_complete_move(data->irq);
+	irq_move_irq(data);
+}
+
+#define iosapic_enable_edge_irq		unmask_irq
+#define iosapic_disable_edge_irq	iosapic_nop
+
+static struct irq_chip irq_type_iosapic_edge = {
+	.name =			"IO-SAPIC-edge",
+	.irq_startup =		iosapic_startup_edge_irq,
+	.irq_shutdown =		iosapic_disable_edge_irq,
+	.irq_enable =		iosapic_enable_edge_irq,
+	.irq_disable =		iosapic_disable_edge_irq,
+	.irq_ack =		iosapic_ack_edge_irq,
+	.irq_mask =		mask_irq,
+	.irq_unmask =		unmask_irq,
+	.irq_set_affinity =	iosapic_set_affinity
+};
+
+static unsigned int
+iosapic_version (char __iomem *addr)
+{
+	/*
+	 * IOSAPIC Version Register return 32 bit structure like:
+	 * {
+	 *	unsigned int version   : 8;
+	 *	unsigned int reserved1 : 8;
+	 *	unsigned int max_redir : 8;
+	 *	unsigned int reserved2 : 8;
+	 * }
+	 */
+	return __iosapic_read(addr, IOSAPIC_VERSION);
+}
+
+static int iosapic_find_sharable_irq(unsigned long trigger, unsigned long pol)
+{
+	int i, irq = -ENOSPC, min_count = -1;
+	struct iosapic_intr_info *info;
+
+	/*
+	 * shared vectors for edge-triggered interrupts are not
+	 * supported yet
+	 */
+	if (trigger == IOSAPIC_EDGE)
+		return -EINVAL;
+
+	for (i = 0; i < NR_IRQS; i++) {
+		info = &iosapic_intr_info[i];
+		if (info->trigger == trigger && info->polarity == pol &&
+		    (info->dmode == IOSAPIC_FIXED ||
+		     info->dmode == IOSAPIC_LOWEST_PRIORITY) &&
+		    can_request_irq(i, IRQF_SHARED)) {
+			if (min_count == -1 || info->count < min_count) {
+				irq = i;
+				min_count = info->count;
+			}
+		}
+	}
+	return irq;
+}
+
+/*
+ * if the given vector is already owned by other,
+ *  assign a new vector for the other and make the vector available
+ */
+static void __init
+iosapic_reassign_vector (int irq)
+{
+	int new_irq;
+
+	if (iosapic_intr_info[irq].count) {
+		new_irq = create_irq();
+		if (new_irq < 0)
+			panic("%s: out of interrupt vectors!\n", __func__);
+		printk(KERN_INFO "Reassigning vector %d to %d\n",
+		       irq_to_vector(irq), irq_to_vector(new_irq));
+		memcpy(&iosapic_intr_info[new_irq], &iosapic_intr_info[irq],
+		       sizeof(struct iosapic_intr_info));
+		INIT_LIST_HEAD(&iosapic_intr_info[new_irq].rtes);
+		list_move(iosapic_intr_info[irq].rtes.next,
+			  &iosapic_intr_info[new_irq].rtes);
+		memset(&iosapic_intr_info[irq], 0,
+		       sizeof(struct iosapic_intr_info));
+		iosapic_intr_info[irq].low32 = IOSAPIC_MASK;
+		INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes);
+	}
+}
+
+static inline int irq_is_shared (int irq)
+{
+	return (iosapic_intr_info[irq].count > 1);
+}
+
+struct irq_chip*
+ia64_native_iosapic_get_irq_chip(unsigned long trigger)
+{
+	if (trigger == IOSAPIC_EDGE)
+		return &irq_type_iosapic_edge;
+	else
+		return &irq_type_iosapic_level;
+}
+
+static int
+register_intr (unsigned int gsi, int irq, unsigned char delivery,
+	       unsigned long polarity, unsigned long trigger)
+{
+	struct irq_chip *chip, *irq_type;
+	int index;
+	struct iosapic_rte_info *rte;
+
+	index = find_iosapic(gsi);
+	if (index < 0) {
+		printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n",
+		       __func__, gsi);
+		return -ENODEV;
+	}
+
+	rte = find_rte(irq, gsi);
+	if (!rte) {
+		rte = kzalloc(sizeof (*rte), GFP_ATOMIC);
+		if (!rte) {
+			printk(KERN_WARNING "%s: cannot allocate memory\n",
+			       __func__);
+			return -ENOMEM;
+		}
+
+		rte->iosapic	= &iosapic_lists[index];
+		rte->rte_index	= gsi - rte->iosapic->gsi_base;
+		rte->refcnt++;
+		list_add_tail(&rte->rte_list, &iosapic_intr_info[irq].rtes);
+		iosapic_intr_info[irq].count++;
+		iosapic_lists[index].rtes_inuse++;
+	}
+	else if (rte->refcnt == NO_REF_RTE) {
+		struct iosapic_intr_info *info = &iosapic_intr_info[irq];
+		if (info->count > 0 &&
+		    (info->trigger != trigger || info->polarity != polarity)){
+			printk (KERN_WARNING
+				"%s: cannot override the interrupt\n",
+				__func__);
+			return -EINVAL;
+		}
+		rte->refcnt++;
+		iosapic_intr_info[irq].count++;
+		iosapic_lists[index].rtes_inuse++;
+	}
+
+	iosapic_intr_info[irq].polarity = polarity;
+	iosapic_intr_info[irq].dmode    = delivery;
+	iosapic_intr_info[irq].trigger  = trigger;
+
+	irq_type = iosapic_get_irq_chip(trigger);
+
+	chip = irq_get_chip(irq);
+	if (irq_type != NULL && chip != irq_type) {
+		if (chip != &no_irq_chip)
+			printk(KERN_WARNING
+			       "%s: changing vector %d from %s to %s\n",
+			       __func__, irq_to_vector(irq),
+			       chip->name, irq_type->name);
+		chip = irq_type;
+	}
+	irq_set_chip_handler_name_locked(irq_get_irq_data(irq), chip,
+		trigger == IOSAPIC_EDGE ? handle_edge_irq : handle_level_irq,
+		NULL);
+	return 0;
+}
+
+static unsigned int
+get_target_cpu (unsigned int gsi, int irq)
+{
+#ifdef CONFIG_SMP
+	static int cpu = -1;
+	extern int cpe_vector;
+	cpumask_t domain = irq_to_domain(irq);
+
+	/*
+	 * In case of vector shared by multiple RTEs, all RTEs that
+	 * share the vector need to use the same destination CPU.
+	 */
+	if (iosapic_intr_info[irq].count)
+		return iosapic_intr_info[irq].dest;
+
+	/*
+	 * If the platform supports redirection via XTP, let it
+	 * distribute interrupts.
+	 */
+	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
+		return cpu_physical_id(smp_processor_id());
+
+	/*
+	 * Some interrupts (ACPI SCI, for instance) are registered
+	 * before the BSP is marked as online.
+	 */
+	if (!cpu_online(smp_processor_id()))
+		return cpu_physical_id(smp_processor_id());
+
+	if (cpe_vector > 0 && irq_to_vector(irq) == IA64_CPEP_VECTOR)
+		return get_cpei_target_cpu();
+
+#ifdef CONFIG_NUMA
+	{
+		int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0;
+		const struct cpumask *cpu_mask;
+
+		iosapic_index = find_iosapic(gsi);
+		if (iosapic_index < 0 ||
+		    iosapic_lists[iosapic_index].node == MAX_NUMNODES)
+			goto skip_numa_setup;
+
+		cpu_mask = cpumask_of_node(iosapic_lists[iosapic_index].node);
+		num_cpus = 0;
+		for_each_cpu_and(numa_cpu, cpu_mask, &domain) {
+			if (cpu_online(numa_cpu))
+				num_cpus++;
+		}
+
+		if (!num_cpus)
+			goto skip_numa_setup;
+
+		/* Use irq assignment to distribute across cpus in node */
+		cpu_index = irq % num_cpus;
+
+		for_each_cpu_and(numa_cpu, cpu_mask, &domain)
+			if (cpu_online(numa_cpu) && i++ >= cpu_index)
+				break;
+
+		if (numa_cpu < nr_cpu_ids)
+			return cpu_physical_id(numa_cpu);
+	}
+skip_numa_setup:
+#endif
+	/*
+	 * Otherwise, round-robin interrupt vectors across all the
+	 * processors.  (It'd be nice if we could be smarter in the
+	 * case of NUMA.)
+	 */
+	do {
+		if (++cpu >= nr_cpu_ids)
+			cpu = 0;
+	} while (!cpu_online(cpu) || !cpumask_test_cpu(cpu, &domain));
+
+	return cpu_physical_id(cpu);
+#else  /* CONFIG_SMP */
+	return cpu_physical_id(smp_processor_id());
+#endif
+}
+
+static inline unsigned char choose_dmode(void)
+{
+#ifdef CONFIG_SMP
+	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
+		return IOSAPIC_LOWEST_PRIORITY;
+#endif
+	return IOSAPIC_FIXED;
+}
+
+/*
+ * ACPI can describe IOSAPIC interrupts via static tables and namespace
+ * methods.  This provides an interface to register those interrupts and
+ * program the IOSAPIC RTE.
+ */
+int
+iosapic_register_intr (unsigned int gsi,
+		       unsigned long polarity, unsigned long trigger)
+{
+	int irq, mask = 1, err;
+	unsigned int dest;
+	unsigned long flags;
+	struct iosapic_rte_info *rte;
+	u32 low32;
+	unsigned char dmode;
+	struct irq_desc *desc;
+
+	/*
+	 * If this GSI has already been registered (i.e., it's a
+	 * shared interrupt, or we lost a race to register it),
+	 * don't touch the RTE.
+	 */
+	spin_lock_irqsave(&iosapic_lock, flags);
+	irq = __gsi_to_irq(gsi);
+	if (irq > 0) {
+		rte = find_rte(irq, gsi);
+		if(iosapic_intr_info[irq].count == 0) {
+			assign_irq_vector(irq);
+			irq_init_desc(irq);
+		} else if (rte->refcnt != NO_REF_RTE) {
+			rte->refcnt++;
+			goto unlock_iosapic_lock;
+		}
+	} else
+		irq = create_irq();
+
+	/* If vector is running out, we try to find a sharable vector */
+	if (irq < 0) {
+		irq = iosapic_find_sharable_irq(trigger, polarity);
+		if (irq < 0)
+			goto unlock_iosapic_lock;
+	}
+
+	desc = irq_to_desc(irq);
+	raw_spin_lock(&desc->lock);
+	dest = get_target_cpu(gsi, irq);
+	dmode = choose_dmode();
+	err = register_intr(gsi, irq, dmode, polarity, trigger);
+	if (err < 0) {
+		raw_spin_unlock(&desc->lock);
+		irq = err;
+		goto unlock_iosapic_lock;
+	}
+
+	/*
+	 * If the vector is shared and already unmasked for other
+	 * interrupt sources, don't mask it.
+	 */
+	low32 = iosapic_intr_info[irq].low32;
+	if (irq_is_shared(irq) && !(low32 & IOSAPIC_MASK))
+		mask = 0;
+	set_rte(gsi, irq, dest, mask);
+
+	printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",
+	       gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
+	       (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
+	       cpu_logical_id(dest), dest, irq_to_vector(irq));
+
+	raw_spin_unlock(&desc->lock);
+ unlock_iosapic_lock:
+	spin_unlock_irqrestore(&iosapic_lock, flags);
+	return irq;
+}
+
+void
+iosapic_unregister_intr (unsigned int gsi)
+{
+	unsigned long flags;
+	int irq, index;
+	u32 low32;
+	unsigned long trigger, polarity;
+	unsigned int dest;
+	struct iosapic_rte_info *rte;
+
+	/*
+	 * If the irq associated with the gsi is not found,
+	 * iosapic_unregister_intr() is unbalanced. We need to check
+	 * this again after getting locks.
+	 */
+	irq = gsi_to_irq(gsi);
+	if (irq < 0) {
+		printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n",
+		       gsi);
+		WARN_ON(1);
+		return;
+	}
+
+	spin_lock_irqsave(&iosapic_lock, flags);
+	if ((rte = find_rte(irq, gsi)) == NULL) {
+		printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n",
+		       gsi);
+		WARN_ON(1);
+		goto out;
+	}
+
+	if (--rte->refcnt > 0)
+		goto out;
+
+	rte->refcnt = NO_REF_RTE;
+
+	/* Mask the interrupt */
+	low32 = iosapic_intr_info[irq].low32 | IOSAPIC_MASK;
+	iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte->rte_index), low32);
+
+	iosapic_intr_info[irq].count--;
+	index = find_iosapic(gsi);
+	iosapic_lists[index].rtes_inuse--;
+	WARN_ON(iosapic_lists[index].rtes_inuse < 0);
+
+	trigger  = iosapic_intr_info[irq].trigger;
+	polarity = iosapic_intr_info[irq].polarity;
+	dest     = iosapic_intr_info[irq].dest;
+	printk(KERN_INFO
+	       "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d unregistered\n",
+	       gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
+	       (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
+	       cpu_logical_id(dest), dest, irq_to_vector(irq));
+
+	if (iosapic_intr_info[irq].count == 0) {
+#ifdef CONFIG_SMP
+		/* Clear affinity */
+		irq_data_update_affinity(irq_get_irq_data(irq), cpu_all_mask);
+#endif
+		/* Clear the interrupt information */
+		iosapic_intr_info[irq].dest = 0;
+		iosapic_intr_info[irq].dmode = 0;
+		iosapic_intr_info[irq].polarity = 0;
+		iosapic_intr_info[irq].trigger = 0;
+		iosapic_intr_info[irq].low32 |= IOSAPIC_MASK;
+
+		/* Destroy and reserve IRQ */
+		destroy_and_reserve_irq(irq);
+	}
+ out:
+	spin_unlock_irqrestore(&iosapic_lock, flags);
+}
+
+/*
+ * ACPI calls this when it finds an entry for a platform interrupt.
+ */
+int __init
+iosapic_register_platform_intr (u32 int_type, unsigned int gsi,
+				int iosapic_vector, u16 eid, u16 id,
+				unsigned long polarity, unsigned long trigger)
+{
+	static const char * const name[] = {"unknown", "PMI", "INIT", "CPEI"};
+	unsigned char delivery;
+	int irq, vector, mask = 0;
+	unsigned int dest = ((id << 8) | eid) & 0xffff;
+
+	switch (int_type) {
+	      case ACPI_INTERRUPT_PMI:
+		irq = vector = iosapic_vector;
+		bind_irq_vector(irq, vector, CPU_MASK_ALL);
+		/*
+		 * since PMI vector is alloc'd by FW(ACPI) not by kernel,
+		 * we need to make sure the vector is available
+		 */
+		iosapic_reassign_vector(irq);
+		delivery = IOSAPIC_PMI;
+		break;
+	      case ACPI_INTERRUPT_INIT:
+		irq = create_irq();
+		if (irq < 0)
+			panic("%s: out of interrupt vectors!\n", __func__);
+		vector = irq_to_vector(irq);
+		delivery = IOSAPIC_INIT;
+		break;
+	      case ACPI_INTERRUPT_CPEI:
+		irq = vector = IA64_CPE_VECTOR;
+		BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL));
+		delivery = IOSAPIC_FIXED;
+		mask = 1;
+		break;
+	      default:
+		printk(KERN_ERR "%s: invalid int type 0x%x\n", __func__,
+		       int_type);
+		return -1;
+	}
+
+	register_intr(gsi, irq, delivery, polarity, trigger);
+
+	printk(KERN_INFO
+	       "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x)"
+	       " vector %d\n",
+	       int_type < ARRAY_SIZE(name) ? name[int_type] : "unknown",
+	       int_type, gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
+	       (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
+	       cpu_logical_id(dest), dest, vector);
+
+	set_rte(gsi, irq, dest, mask);
+	return vector;
+}
+
+/*
+ * ACPI calls this when it finds an entry for a legacy ISA IRQ override.
+ */
+void iosapic_override_isa_irq(unsigned int isa_irq, unsigned int gsi,
+			      unsigned long polarity, unsigned long trigger)
+{
+	int vector, irq;
+	unsigned int dest = cpu_physical_id(smp_processor_id());
+	unsigned char dmode;
+
+	irq = vector = isa_irq_to_vector(isa_irq);
+	BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL));
+	dmode = choose_dmode();
+	register_intr(gsi, irq, dmode, polarity, trigger);
+
+	DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n",
+	    isa_irq, gsi, trigger == IOSAPIC_EDGE ? "edge" : "level",
+	    polarity == IOSAPIC_POL_HIGH ? "high" : "low",
+	    cpu_logical_id(dest), dest, vector);
+
+	set_rte(gsi, irq, dest, 1);
+}
+
+void __init
+ia64_native_iosapic_pcat_compat_init(void)
+{
+	if (pcat_compat) {
+		/*
+		 * Disable the compatibility mode interrupts (8259 style),
+		 * needs IN/OUT support enabled.
+		 */
+		printk(KERN_INFO
+		       "%s: Disabling PC-AT compatible 8259 interrupts\n",
+		       __func__);
+		outb(0xff, 0xA1);
+		outb(0xff, 0x21);
+	}
+}
+
+void __init
+iosapic_system_init (int system_pcat_compat)
+{
+	int irq;
+
+	for (irq = 0; irq < NR_IRQS; ++irq) {
+		iosapic_intr_info[irq].low32 = IOSAPIC_MASK;
+		/* mark as unused */
+		INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes);
+
+		iosapic_intr_info[irq].count = 0;
+	}
+
+	pcat_compat = system_pcat_compat;
+	if (pcat_compat)
+		iosapic_pcat_compat_init();
+}
+
+static inline int
+iosapic_alloc (void)
+{
+	int index;
+
+	for (index = 0; index < NR_IOSAPICS; index++)
+		if (!iosapic_lists[index].addr)
+			return index;
+
+	printk(KERN_WARNING "%s: failed to allocate iosapic\n", __func__);
+	return -1;
+}
+
+static inline void
+iosapic_free (int index)
+{
+	memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0]));
+}
+
+static inline int
+iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver)
+{
+	int index;
+	unsigned int gsi_end, base, end;
+
+	/* check gsi range */
+	gsi_end = gsi_base + ((ver >> 16) & 0xff);
+	for (index = 0; index < NR_IOSAPICS; index++) {
+		if (!iosapic_lists[index].addr)
+			continue;
+
+		base = iosapic_lists[index].gsi_base;
+		end  = base + iosapic_lists[index].num_rte - 1;
+
+		if (gsi_end < base || end < gsi_base)
+			continue; /* OK */
+
+		return -EBUSY;
+	}
+	return 0;
+}
+
+static int
+iosapic_delete_rte(unsigned int irq, unsigned int gsi)
+{
+	struct iosapic_rte_info *rte, *temp;
+
+	list_for_each_entry_safe(rte, temp, &iosapic_intr_info[irq].rtes,
+								rte_list) {
+		if (rte->iosapic->gsi_base + rte->rte_index == gsi) {
+			if (rte->refcnt)
+				return -EBUSY;
+
+			list_del(&rte->rte_list);
+			kfree(rte);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+int iosapic_init(unsigned long phys_addr, unsigned int gsi_base)
+{
+	int num_rte, err, index;
+	unsigned int isa_irq, ver;
+	char __iomem *addr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&iosapic_lock, flags);
+	index = find_iosapic(gsi_base);
+	if (index >= 0) {
+		spin_unlock_irqrestore(&iosapic_lock, flags);
+		return -EBUSY;
+	}
+
+	addr = ioremap(phys_addr, 0);
+	if (addr == NULL) {
+		spin_unlock_irqrestore(&iosapic_lock, flags);
+		return -ENOMEM;
+	}
+	ver = iosapic_version(addr);
+	if ((err = iosapic_check_gsi_range(gsi_base, ver))) {
+		iounmap(addr);
+		spin_unlock_irqrestore(&iosapic_lock, flags);
+		return err;
+	}
+
+	/*
+	 * The MAX_REDIR register holds the highest input pin number
+	 * (starting from 0).  We add 1 so that we can use it for
+	 * number of pins (= RTEs)
+	 */
+	num_rte = ((ver >> 16) & 0xff) + 1;
+
+	index = iosapic_alloc();
+	iosapic_lists[index].addr = addr;
+	iosapic_lists[index].gsi_base = gsi_base;
+	iosapic_lists[index].num_rte = num_rte;
+#ifdef CONFIG_NUMA
+	iosapic_lists[index].node = MAX_NUMNODES;
+#endif
+	spin_lock_init(&iosapic_lists[index].lock);
+	spin_unlock_irqrestore(&iosapic_lock, flags);
+
+	if ((gsi_base == 0) && pcat_compat) {
+		/*
+		 * Map the legacy ISA devices into the IOSAPIC data.  Some of
+		 * these may get reprogrammed later on with data from the ACPI
+		 * Interrupt Source Override table.
+		 */
+		for (isa_irq = 0; isa_irq < 16; ++isa_irq)
+			iosapic_override_isa_irq(isa_irq, isa_irq,
+						 IOSAPIC_POL_HIGH,
+						 IOSAPIC_EDGE);
+	}
+	return 0;
+}
+
+int iosapic_remove(unsigned int gsi_base)
+{
+	int i, irq, index, err = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&iosapic_lock, flags);
+	index = find_iosapic(gsi_base);
+	if (index < 0) {
+		printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n",
+		       __func__, gsi_base);
+		goto out;
+	}
+
+	if (iosapic_lists[index].rtes_inuse) {
+		err = -EBUSY;
+		printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n",
+		       __func__, gsi_base);
+		goto out;
+	}
+
+	for (i = gsi_base; i < gsi_base + iosapic_lists[index].num_rte; i++) {
+		irq = __gsi_to_irq(i);
+		if (irq < 0)
+			continue;
+
+		err = iosapic_delete_rte(irq, i);
+		if (err)
+			goto out;
+	}
+
+	iounmap(iosapic_lists[index].addr);
+	iosapic_free(index);
+ out:
+	spin_unlock_irqrestore(&iosapic_lock, flags);
+	return err;
+}
+
+#ifdef CONFIG_NUMA
+void map_iosapic_to_node(unsigned int gsi_base, int node)
+{
+	int index;
+
+	index = find_iosapic(gsi_base);
+	if (index < 0) {
+		printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n",
+		       __func__, gsi_base);
+		return;
+	}
+	iosapic_lists[index].node = node;
+	return;
+}
+#endif
diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
new file mode 100644
index 000000000..275b9ea58
--- /dev/null
+++ b/arch/ia64/kernel/irq.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	linux/arch/ia64/kernel/irq.c
+ *
+ *	Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains the code used by various IRQ handling routines:
+ * asking for different IRQs should be done through these routines
+ * instead of just grabbing them. Thus setups with different IRQ numbers
+ * shouldn't result in any weird surprises, and installing new handlers
+ * should be easier.
+ *
+ * Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004
+ *
+ * 4/14/2004: Added code to handle cpu migration and do safe irq
+ *			migration without losing interrupts for iosapic
+ *			architecture.
+ */
+
+#include <asm/delay.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/mca.h>
+#include <asm/xtp.h>
+
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+	printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id());
+}
+
+/*
+ * Interrupt statistics:
+ */
+
+atomic_t irq_err_count;
+
+/*
+ * /proc/interrupts printing:
+ */
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+	seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
+	return 0;
+}
+
+#ifdef CONFIG_SMP
+static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
+
+void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
+{
+	if (irq < NR_IRQS) {
+		irq_data_update_affinity(irq_get_irq_data(irq),
+					 cpumask_of(cpu_logical_id(hwid)));
+		irq_redir[irq] = (char) (redir & 0xff);
+	}
+}
+#endif /* CONFIG_SMP */
+
+int __init arch_early_irq_init(void)
+{
+	ia64_mca_irq_init();
+	return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+unsigned int vectors_in_migration[NR_IRQS];
+
+/*
+ * Since cpu_online_mask is already updated, we just need to check for
+ * affinity that has zeros
+ */
+static void migrate_irqs(void)
+{
+	int 		irq, new_cpu;
+
+	for (irq=0; irq < NR_IRQS; irq++) {
+		struct irq_desc *desc = irq_to_desc(irq);
+		struct irq_data *data = irq_desc_get_irq_data(desc);
+		struct irq_chip *chip = irq_data_get_irq_chip(data);
+
+		if (irqd_irq_disabled(data))
+			continue;
+
+		/*
+		 * No handling for now.
+		 * TBD: Implement a disable function so we can now
+		 * tell CPU not to respond to these local intr sources.
+		 * such as ITV,CPEI,MCA etc.
+		 */
+		if (irqd_is_per_cpu(data))
+			continue;
+
+		if (cpumask_any_and(irq_data_get_affinity_mask(data),
+				    cpu_online_mask) >= nr_cpu_ids) {
+			/*
+			 * Save it for phase 2 processing
+			 */
+			vectors_in_migration[irq] = irq;
+
+			new_cpu = cpumask_any(cpu_online_mask);
+
+			/*
+			 * Al three are essential, currently WARN_ON.. maybe panic?
+			 */
+			if (chip && chip->irq_disable &&
+				chip->irq_enable && chip->irq_set_affinity) {
+				chip->irq_disable(data);
+				chip->irq_set_affinity(data,
+						       cpumask_of(new_cpu), false);
+				chip->irq_enable(data);
+			} else {
+				WARN_ON((!chip || !chip->irq_disable ||
+					 !chip->irq_enable ||
+					 !chip->irq_set_affinity));
+			}
+		}
+	}
+}
+
+void fixup_irqs(void)
+{
+	unsigned int irq;
+	extern void ia64_process_pending_intr(void);
+	extern volatile int time_keeper_id;
+
+	/* Mask ITV to disable timer */
+	ia64_set_itv(1 << 16);
+
+	/*
+	 * Find a new timesync master
+	 */
+	if (smp_processor_id() == time_keeper_id) {
+		time_keeper_id = cpumask_first(cpu_online_mask);
+		printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id);
+	}
+
+	/*
+	 * Phase 1: Locate IRQs bound to this cpu and
+	 * relocate them for cpu removal.
+	 */
+	migrate_irqs();
+
+	/*
+	 * Phase 2: Perform interrupt processing for all entries reported in
+	 * local APIC.
+	 */
+	ia64_process_pending_intr();
+
+	/*
+	 * Phase 3: Now handle any interrupts not captured in local APIC.
+	 * This is to account for cases that device interrupted during the time the
+	 * rte was being disabled and re-programmed.
+	 */
+	for (irq=0; irq < NR_IRQS; irq++) {
+		if (vectors_in_migration[irq]) {
+			struct pt_regs *old_regs = set_irq_regs(NULL);
+
+			vectors_in_migration[irq]=0;
+			generic_handle_irq(irq);
+			set_irq_regs(old_regs);
+		}
+	}
+
+	/*
+	 * Now let processor die. We do irq disable and max_xtp() to
+	 * ensure there is no more interrupts routed to this processor.
+	 * But the local timer interrupt can have 1 pending which we
+	 * take care in timer_interrupt().
+	 */
+	max_xtp();
+	local_irq_disable();
+}
+#endif
diff --git a/arch/ia64/kernel/irq.h b/arch/ia64/kernel/irq.h
new file mode 100644
index 000000000..4d16f3cbe
--- /dev/null
+++ b/arch/ia64/kernel/irq.h
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+extern void register_percpu_irq(ia64_vector vec, irq_handler_t handler,
+				unsigned long flags, const char *name);
diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
new file mode 100644
index 000000000..46e33c5cb
--- /dev/null
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -0,0 +1,645 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/ia64/kernel/irq_ia64.c
+ *
+ * Copyright (C) 1998-2001 Hewlett-Packard Co
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ *  6/10/99: Updated to bring in sync with x86 version to facilitate
+ *	     support for SMP and different interrupt controllers.
+ *
+ * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
+ *                      PCI to vector allocation routine.
+ * 04/14/2004 Ashok Raj <ashok.raj@intel.com>
+ *						Added CPU Hotplug handling for IPF.
+ */
+
+#include <linux/module.h>
+#include <linux/pgtable.h>
+
+#include <linux/jiffies.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel_stat.h>
+#include <linux/ptrace.h>
+#include <linux/signal.h>
+#include <linux/smp.h>
+#include <linux/threads.h>
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/ratelimit.h>
+#include <linux/acpi.h>
+#include <linux/sched.h>
+
+#include <asm/delay.h>
+#include <asm/intrinsics.h>
+#include <asm/io.h>
+#include <asm/hw_irq.h>
+#include <asm/tlbflush.h>
+
+#define IRQ_DEBUG	0
+
+#define IRQ_VECTOR_UNASSIGNED	(0)
+
+#define IRQ_UNUSED		(0)
+#define IRQ_USED		(1)
+#define IRQ_RSVD		(2)
+
+int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
+int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
+
+/* default base addr of IPI table */
+void __iomem *ipi_base_addr = ((void __iomem *)
+			       (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
+
+static cpumask_t vector_allocation_domain(int cpu);
+
+/*
+ * Legacy IRQ to IA-64 vector translation table.
+ */
+__u8 isa_irq_to_vector_map[16] = {
+	/* 8259 IRQ translation, first 16 entries */
+	0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
+	0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
+};
+EXPORT_SYMBOL(isa_irq_to_vector_map);
+
+DEFINE_SPINLOCK(vector_lock);
+
+struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
+	[0 ... NR_IRQS - 1] = {
+		.vector = IRQ_VECTOR_UNASSIGNED,
+		.domain = CPU_MASK_NONE
+	}
+};
+
+DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
+	[0 ... IA64_NUM_VECTORS - 1] = -1
+};
+
+static cpumask_t vector_table[IA64_NUM_VECTORS] = {
+	[0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
+};
+
+static int irq_status[NR_IRQS] = {
+	[0 ... NR_IRQS -1] = IRQ_UNUSED
+};
+
+static inline int find_unassigned_irq(void)
+{
+	int irq;
+
+	for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
+		if (irq_status[irq] == IRQ_UNUSED)
+			return irq;
+	return -ENOSPC;
+}
+
+static inline int find_unassigned_vector(cpumask_t domain)
+{
+	cpumask_t mask;
+	int pos, vector;
+
+	cpumask_and(&mask, &domain, cpu_online_mask);
+	if (cpumask_empty(&mask))
+		return -EINVAL;
+
+	for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
+		vector = IA64_FIRST_DEVICE_VECTOR + pos;
+		cpumask_and(&mask, &domain, &vector_table[vector]);
+		if (!cpumask_empty(&mask))
+			continue;
+		return vector;
+	}
+	return -ENOSPC;
+}
+
+static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
+{
+	cpumask_t mask;
+	int cpu;
+	struct irq_cfg *cfg = &irq_cfg[irq];
+
+	BUG_ON((unsigned)irq >= NR_IRQS);
+	BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
+
+	cpumask_and(&mask, &domain, cpu_online_mask);
+	if (cpumask_empty(&mask))
+		return -EINVAL;
+	if ((cfg->vector == vector) && cpumask_equal(&cfg->domain, &domain))
+		return 0;
+	if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
+		return -EBUSY;
+	for_each_cpu(cpu, &mask)
+		per_cpu(vector_irq, cpu)[vector] = irq;
+	cfg->vector = vector;
+	cfg->domain = domain;
+	irq_status[irq] = IRQ_USED;
+	cpumask_or(&vector_table[vector], &vector_table[vector], &domain);
+	return 0;
+}
+
+int bind_irq_vector(int irq, int vector, cpumask_t domain)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&vector_lock, flags);
+	ret = __bind_irq_vector(irq, vector, domain);
+	spin_unlock_irqrestore(&vector_lock, flags);
+	return ret;
+}
+
+static void __clear_irq_vector(int irq)
+{
+	int vector, cpu;
+	cpumask_t domain;
+	struct irq_cfg *cfg = &irq_cfg[irq];
+
+	BUG_ON((unsigned)irq >= NR_IRQS);
+	BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
+	vector = cfg->vector;
+	domain = cfg->domain;
+	for_each_cpu_and(cpu, &cfg->domain, cpu_online_mask)
+		per_cpu(vector_irq, cpu)[vector] = -1;
+	cfg->vector = IRQ_VECTOR_UNASSIGNED;
+	cfg->domain = CPU_MASK_NONE;
+	irq_status[irq] = IRQ_UNUSED;
+	cpumask_andnot(&vector_table[vector], &vector_table[vector], &domain);
+}
+
+static void clear_irq_vector(int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&vector_lock, flags);
+	__clear_irq_vector(irq);
+	spin_unlock_irqrestore(&vector_lock, flags);
+}
+
+int
+ia64_native_assign_irq_vector (int irq)
+{
+	unsigned long flags;
+	int vector, cpu;
+	cpumask_t domain = CPU_MASK_NONE;
+
+	vector = -ENOSPC;
+
+	spin_lock_irqsave(&vector_lock, flags);
+	for_each_online_cpu(cpu) {
+		domain = vector_allocation_domain(cpu);
+		vector = find_unassigned_vector(domain);
+		if (vector >= 0)
+			break;
+	}
+	if (vector < 0)
+		goto out;
+	if (irq == AUTO_ASSIGN)
+		irq = vector;
+	BUG_ON(__bind_irq_vector(irq, vector, domain));
+ out:
+	spin_unlock_irqrestore(&vector_lock, flags);
+	return vector;
+}
+
+void
+ia64_native_free_irq_vector (int vector)
+{
+	if (vector < IA64_FIRST_DEVICE_VECTOR ||
+	    vector > IA64_LAST_DEVICE_VECTOR)
+		return;
+	clear_irq_vector(vector);
+}
+
+int
+reserve_irq_vector (int vector)
+{
+	if (vector < IA64_FIRST_DEVICE_VECTOR ||
+	    vector > IA64_LAST_DEVICE_VECTOR)
+		return -EINVAL;
+	return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
+}
+
+/*
+ * Initialize vector_irq on a new cpu. This function must be called
+ * with vector_lock held.
+ */
+void __setup_vector_irq(int cpu)
+{
+	int irq, vector;
+
+	/* Clear vector_irq */
+	for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
+		per_cpu(vector_irq, cpu)[vector] = -1;
+	/* Mark the inuse vectors */
+	for (irq = 0; irq < NR_IRQS; ++irq) {
+		if (!cpumask_test_cpu(cpu, &irq_cfg[irq].domain))
+			continue;
+		vector = irq_to_vector(irq);
+		per_cpu(vector_irq, cpu)[vector] = irq;
+	}
+}
+
+#ifdef CONFIG_SMP
+
+static enum vector_domain_type {
+	VECTOR_DOMAIN_NONE,
+	VECTOR_DOMAIN_PERCPU
+} vector_domain_type = VECTOR_DOMAIN_NONE;
+
+static cpumask_t vector_allocation_domain(int cpu)
+{
+	if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
+		return *cpumask_of(cpu);
+	return CPU_MASK_ALL;
+}
+
+static int __irq_prepare_move(int irq, int cpu)
+{
+	struct irq_cfg *cfg = &irq_cfg[irq];
+	int vector;
+	cpumask_t domain;
+
+	if (cfg->move_in_progress || cfg->move_cleanup_count)
+		return -EBUSY;
+	if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
+		return -EINVAL;
+	if (cpumask_test_cpu(cpu, &cfg->domain))
+		return 0;
+	domain = vector_allocation_domain(cpu);
+	vector = find_unassigned_vector(domain);
+	if (vector < 0)
+		return -ENOSPC;
+	cfg->move_in_progress = 1;
+	cfg->old_domain = cfg->domain;
+	cfg->vector = IRQ_VECTOR_UNASSIGNED;
+	cfg->domain = CPU_MASK_NONE;
+	BUG_ON(__bind_irq_vector(irq, vector, domain));
+	return 0;
+}
+
+int irq_prepare_move(int irq, int cpu)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&vector_lock, flags);
+	ret = __irq_prepare_move(irq, cpu);
+	spin_unlock_irqrestore(&vector_lock, flags);
+	return ret;
+}
+
+void irq_complete_move(unsigned irq)
+{
+	struct irq_cfg *cfg = &irq_cfg[irq];
+	cpumask_t cleanup_mask;
+	int i;
+
+	if (likely(!cfg->move_in_progress))
+		return;
+
+	if (unlikely(cpumask_test_cpu(smp_processor_id(), &cfg->old_domain)))
+		return;
+
+	cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask);
+	cfg->move_cleanup_count = cpumask_weight(&cleanup_mask);
+	for_each_cpu(i, &cleanup_mask)
+		ia64_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
+	cfg->move_in_progress = 0;
+}
+
+static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
+{
+	int me = smp_processor_id();
+	ia64_vector vector;
+	unsigned long flags;
+
+	for (vector = IA64_FIRST_DEVICE_VECTOR;
+	     vector < IA64_LAST_DEVICE_VECTOR; vector++) {
+		int irq;
+		struct irq_desc *desc;
+		struct irq_cfg *cfg;
+		irq = __this_cpu_read(vector_irq[vector]);
+		if (irq < 0)
+			continue;
+
+		desc = irq_to_desc(irq);
+		cfg = irq_cfg + irq;
+		raw_spin_lock(&desc->lock);
+		if (!cfg->move_cleanup_count)
+			goto unlock;
+
+		if (!cpumask_test_cpu(me, &cfg->old_domain))
+			goto unlock;
+
+		spin_lock_irqsave(&vector_lock, flags);
+		__this_cpu_write(vector_irq[vector], -1);
+		cpumask_clear_cpu(me, &vector_table[vector]);
+		spin_unlock_irqrestore(&vector_lock, flags);
+		cfg->move_cleanup_count--;
+	unlock:
+		raw_spin_unlock(&desc->lock);
+	}
+	return IRQ_HANDLED;
+}
+
+static int __init parse_vector_domain(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+	if (!strcmp(arg, "percpu")) {
+		vector_domain_type = VECTOR_DOMAIN_PERCPU;
+		no_int_routing = 1;
+	}
+	return 0;
+}
+early_param("vector", parse_vector_domain);
+#else
+static cpumask_t vector_allocation_domain(int cpu)
+{
+	return CPU_MASK_ALL;
+}
+#endif
+
+
+void destroy_and_reserve_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	irq_init_desc(irq);
+	spin_lock_irqsave(&vector_lock, flags);
+	__clear_irq_vector(irq);
+	irq_status[irq] = IRQ_RSVD;
+	spin_unlock_irqrestore(&vector_lock, flags);
+}
+
+/*
+ * Dynamic irq allocate and deallocation for MSI
+ */
+int create_irq(void)
+{
+	unsigned long flags;
+	int irq, vector, cpu;
+	cpumask_t domain = CPU_MASK_NONE;
+
+	irq = vector = -ENOSPC;
+	spin_lock_irqsave(&vector_lock, flags);
+	for_each_online_cpu(cpu) {
+		domain = vector_allocation_domain(cpu);
+		vector = find_unassigned_vector(domain);
+		if (vector >= 0)
+			break;
+	}
+	if (vector < 0)
+		goto out;
+	irq = find_unassigned_irq();
+	if (irq < 0)
+		goto out;
+	BUG_ON(__bind_irq_vector(irq, vector, domain));
+ out:
+	spin_unlock_irqrestore(&vector_lock, flags);
+	if (irq >= 0)
+		irq_init_desc(irq);
+	return irq;
+}
+
+void destroy_irq(unsigned int irq)
+{
+	irq_init_desc(irq);
+	clear_irq_vector(irq);
+}
+
+#ifdef CONFIG_SMP
+#	define IS_RESCHEDULE(vec)	(vec == IA64_IPI_RESCHEDULE)
+#	define IS_LOCAL_TLB_FLUSH(vec)	(vec == IA64_IPI_LOCAL_TLB_FLUSH)
+#else
+#	define IS_RESCHEDULE(vec)	(0)
+#	define IS_LOCAL_TLB_FLUSH(vec)	(0)
+#endif
+/*
+ * That's where the IVT branches when we get an external
+ * interrupt. This branches to the correct hardware IRQ handler via
+ * function ptr.
+ */
+void
+ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
+	unsigned long saved_tpr;
+
+#if IRQ_DEBUG
+	{
+		unsigned long bsp, sp;
+
+		/*
+		 * Note: if the interrupt happened while executing in
+		 * the context switch routine (ia64_switch_to), we may
+		 * get a spurious stack overflow here.  This is
+		 * because the register and the memory stack are not
+		 * switched atomically.
+		 */
+		bsp = ia64_getreg(_IA64_REG_AR_BSP);
+		sp = ia64_getreg(_IA64_REG_SP);
+
+		if ((sp - bsp) < 1024) {
+			static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
+
+			if (__ratelimit(&ratelimit)) {
+				printk("ia64_handle_irq: DANGER: less than "
+				       "1KB of free stack space!!\n"
+				       "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
+			}
+		}
+	}
+#endif /* IRQ_DEBUG */
+
+	/*
+	 * Always set TPR to limit maximum interrupt nesting depth to
+	 * 16 (without this, it would be ~240, which could easily lead
+	 * to kernel stack overflows).
+	 */
+	irq_enter();
+	saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
+	ia64_srlz_d();
+	while (vector != IA64_SPURIOUS_INT_VECTOR) {
+		int irq = local_vector_to_irq(vector);
+
+		if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
+			smp_local_flush_tlb();
+			kstat_incr_irq_this_cpu(irq);
+		} else if (unlikely(IS_RESCHEDULE(vector))) {
+			scheduler_ipi();
+			kstat_incr_irq_this_cpu(irq);
+		} else {
+			ia64_setreg(_IA64_REG_CR_TPR, vector);
+			ia64_srlz_d();
+
+			if (unlikely(irq < 0)) {
+				printk(KERN_ERR "%s: Unexpected interrupt "
+				       "vector %d on CPU %d is not mapped "
+				       "to any IRQ!\n", __func__, vector,
+				       smp_processor_id());
+			} else
+				generic_handle_irq(irq);
+
+			/*
+			 * Disable interrupts and send EOI:
+			 */
+			local_irq_disable();
+			ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
+		}
+		ia64_eoi();
+		vector = ia64_get_ivr();
+	}
+	/*
+	 * This must be done *after* the ia64_eoi().  For example, the keyboard softirq
+	 * handler needs to be able to wait for further keyboard interrupts, which can't
+	 * come through until ia64_eoi() has been done.
+	 */
+	irq_exit();
+	set_irq_regs(old_regs);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+/*
+ * This function emulates a interrupt processing when a cpu is about to be
+ * brought down.
+ */
+void ia64_process_pending_intr(void)
+{
+	ia64_vector vector;
+	unsigned long saved_tpr;
+	extern unsigned int vectors_in_migration[NR_IRQS];
+
+	vector = ia64_get_ivr();
+
+	irq_enter();
+	saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
+	ia64_srlz_d();
+
+	 /*
+	  * Perform normal interrupt style processing
+	  */
+	while (vector != IA64_SPURIOUS_INT_VECTOR) {
+		int irq = local_vector_to_irq(vector);
+
+		if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
+			smp_local_flush_tlb();
+			kstat_incr_irq_this_cpu(irq);
+		} else if (unlikely(IS_RESCHEDULE(vector))) {
+			kstat_incr_irq_this_cpu(irq);
+		} else {
+			struct pt_regs *old_regs = set_irq_regs(NULL);
+
+			ia64_setreg(_IA64_REG_CR_TPR, vector);
+			ia64_srlz_d();
+
+			/*
+			 * Now try calling normal ia64_handle_irq as it would have got called
+			 * from a real intr handler. Try passing null for pt_regs, hopefully
+			 * it will work. I hope it works!.
+			 * Probably could shared code.
+			 */
+			if (unlikely(irq < 0)) {
+				printk(KERN_ERR "%s: Unexpected interrupt "
+				       "vector %d on CPU %d not being mapped "
+				       "to any IRQ!!\n", __func__, vector,
+				       smp_processor_id());
+			} else {
+				vectors_in_migration[irq]=0;
+				generic_handle_irq(irq);
+			}
+			set_irq_regs(old_regs);
+
+			/*
+			 * Disable interrupts and send EOI
+			 */
+			local_irq_disable();
+			ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
+		}
+		ia64_eoi();
+		vector = ia64_get_ivr();
+	}
+	irq_exit();
+}
+#endif
+
+
+#ifdef CONFIG_SMP
+
+static irqreturn_t dummy_handler (int irq, void *dev_id)
+{
+	BUG();
+	return IRQ_NONE;
+}
+
+/*
+ * KVM uses this interrupt to force a cpu out of guest mode
+ */
+
+#endif
+
+void
+register_percpu_irq(ia64_vector vec, irq_handler_t handler, unsigned long flags,
+		    const char *name)
+{
+	unsigned int irq;
+
+	irq = vec;
+	BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
+	irq_set_status_flags(irq, IRQ_PER_CPU);
+	irq_set_chip(irq, &irq_type_ia64_lsapic);
+	if (handler)
+		if (request_irq(irq, handler, flags, name, NULL))
+			pr_err("Failed to request irq %u (%s)\n", irq, name);
+	irq_set_handler(irq, handle_percpu_irq);
+}
+
+void __init
+ia64_native_register_ipi(void)
+{
+#ifdef CONFIG_SMP
+	register_percpu_irq(IA64_IPI_VECTOR, handle_IPI, 0, "IPI");
+	register_percpu_irq(IA64_IPI_RESCHEDULE, dummy_handler, 0, "resched");
+	register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, dummy_handler, 0,
+			    "tlb_flush");
+#endif
+}
+
+void __init
+init_IRQ (void)
+{
+	acpi_boot_init();
+	ia64_register_ipi();
+	register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL, 0, NULL);
+#ifdef CONFIG_SMP
+	if (vector_domain_type != VECTOR_DOMAIN_NONE) {
+		register_percpu_irq(IA64_IRQ_MOVE_VECTOR,
+				    smp_irq_move_cleanup_interrupt, 0,
+				    "irq_move");
+	}
+#endif
+}
+
+void
+ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
+{
+	void __iomem *ipi_addr;
+	unsigned long ipi_data;
+	unsigned long phys_cpu_id;
+
+	phys_cpu_id = cpu_physical_id(cpu);
+
+	/*
+	 * cpu number is in 8bit ID and 8bit EID
+	 */
+
+	ipi_data = (delivery_mode << 8) | (vector & 0xff);
+	ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3));
+
+	writeq(ipi_data, ipi_addr);
+}
diff --git a/arch/ia64/kernel/irq_lsapic.c b/arch/ia64/kernel/irq_lsapic.c
new file mode 100644
index 000000000..23bf4499a
--- /dev/null
+++ b/arch/ia64/kernel/irq_lsapic.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * LSAPIC Interrupt Controller
+ *
+ * This takes care of interrupts that are generated by the CPU's
+ * internal Streamlined Advanced Programmable Interrupt Controller
+ * (LSAPIC), such as the ITC and IPI interrupts.
+    *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 2000 Hewlett-Packard Co
+ * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#include <linux/sched.h>
+#include <linux/irq.h>
+
+static unsigned int
+lsapic_noop_startup (struct irq_data *data)
+{
+	return 0;
+}
+
+static void
+lsapic_noop (struct irq_data *data)
+{
+	/* nothing to do... */
+}
+
+static int lsapic_retrigger(struct irq_data *data)
+{
+	ia64_resend_irq(data->irq);
+
+	return 1;
+}
+
+struct irq_chip irq_type_ia64_lsapic = {
+	.name =			"LSAPIC",
+	.irq_startup =		lsapic_noop_startup,
+	.irq_shutdown =		lsapic_noop,
+	.irq_enable =		lsapic_noop,
+	.irq_disable =		lsapic_noop,
+	.irq_ack =		lsapic_noop,
+	.irq_retrigger =	lsapic_retrigger,
+};
diff --git a/arch/ia64/kernel/ivt.S b/arch/ia64/kernel/ivt.S
new file mode 100644
index 000000000..d6d4229b2
--- /dev/null
+++ b/arch/ia64/kernel/ivt.S
@@ -0,0 +1,1689 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arch/ia64/kernel/ivt.S
+ *
+ * Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ *	David Mosberger <davidm@hpl.hp.com>
+ * Copyright (C) 2000, 2002-2003 Intel Co
+ *	Asit Mallick <asit.k.mallick@intel.com>
+ *      Suresh Siddha <suresh.b.siddha@intel.com>
+ *      Kenneth Chen <kenneth.w.chen@intel.com>
+ *      Fenghua Yu <fenghua.yu@intel.com>
+ *
+ * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
+ * 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *	Dan Magenheimer <dan.magenheimer@hp.com>
+ *      Xen paravirtualization
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *                    pv_ops.
+ *      Yaozu (Eddie) Dong <eddie.dong@intel.com>
+ */
+/*
+ * This file defines the interruption vector table used by the CPU.
+ * It does not include one entry per possible cause of interruption.
+ *
+ * The first 20 entries of the table contain 64 bundles each while the
+ * remaining 48 entries contain only 16 bundles each.
+ *
+ * The 64 bundles are used to allow inlining the whole handler for critical
+ * interruptions like TLB misses.
+ *
+ *  For each entry, the comment is as follows:
+ *
+ *		// 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
+ *  entry offset ----/     /         /                  /          /
+ *  entry number ---------/         /                  /          /
+ *  size of the entry -------------/                  /          /
+ *  vector name -------------------------------------/          /
+ *  interruptions triggering this vector ----------------------/
+ *
+ * The table is 32KB in size and must be aligned on 32KB boundary.
+ * (The CPU ignores the 15 lower bits of the address)
+ *
+ * Table is based upon EAS2.6 (Oct 1999)
+ */
+
+
+#include <linux/pgtable.h>
+#include <asm/asmmacro.h>
+#include <asm/break.h>
+#include <asm/kregs.h>
+#include <asm/asm-offsets.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+#include <asm/errno.h>
+#include <asm/export.h>
+
+#if 0
+# define PSR_DEFAULT_BITS	psr.ac
+#else
+# define PSR_DEFAULT_BITS	0
+#endif
+
+#if 0
+  /*
+   * This lets you track the last eight faults that occurred on the CPU.  Make sure ar.k2 isn't
+   * needed for something else before enabling this...
+   */
+# define DBG_FAULT(i)	mov r16=ar.k2;;	shl r16=r16,8;;	add r16=(i),r16;;mov ar.k2=r16
+#else
+# define DBG_FAULT(i)
+#endif
+
+#include "minstate.h"
+
+#define FAULT(n)									\
+	mov r31=pr;									\
+	mov r19=n;;			/* prepare to save predicates */		\
+	br.sptk.many dispatch_to_fault_handler
+
+	.section .text..ivt,"ax"
+
+	.align 32768	// align on 32KB boundary
+	.global ia64_ivt
+	EXPORT_DATA_SYMBOL(ia64_ivt)
+ia64_ivt:
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
+ENTRY(vhpt_miss)
+	DBG_FAULT(0)
+	/*
+	 * The VHPT vector is invoked when the TLB entry for the virtual page table
+	 * is missing.  This happens only as a result of a previous
+	 * (the "original") TLB miss, which may either be caused by an instruction
+	 * fetch or a data access (or non-access).
+	 *
+	 * What we do here is normal TLB miss handing for the _original_ miss,
+	 * followed by inserting the TLB entry for the virtual page table page
+	 * that the VHPT walker was attempting to access.  The latter gets
+	 * inserted as long as page table entry above pte level have valid
+	 * mappings for the faulting address.  The TLB entry for the original
+	 * miss gets inserted only if the pte entry indicates that the page is
+	 * present.
+	 *
+	 * do_page_fault gets invoked in the following cases:
+	 *	- the faulting virtual address uses unimplemented address bits
+	 *	- the faulting virtual address has no valid page table mapping
+	 */
+	MOV_FROM_IFA(r16)			// get address that caused the TLB miss
+#ifdef CONFIG_HUGETLB_PAGE
+	movl r18=PAGE_SHIFT
+	MOV_FROM_ITIR(r25)
+#endif
+	;;
+	RSM_PSR_DT				// use physical addressing for data
+	mov r31=pr				// save the predicate registers
+	mov r19=IA64_KR(PT_BASE)		// get page table base address
+	shl r21=r16,3				// shift bit 60 into sign bit
+	shr.u r17=r16,61			// get the region number into r17
+	;;
+	shr.u r22=r21,3
+#ifdef CONFIG_HUGETLB_PAGE
+	extr.u r26=r25,2,6
+	;;
+	cmp.ne p8,p0=r18,r26
+	sub r27=r26,r18
+	;;
+(p8)	dep r25=r18,r25,2,6
+(p8)	shr r22=r22,r27
+#endif
+	;;
+	cmp.eq p6,p7=5,r17			// is IFA pointing into to region 5?
+	shr.u r18=r22,PGDIR_SHIFT		// get bottom portion of pgd index bit
+	;;
+(p7)	dep r17=r17,r19,(PAGE_SHIFT-3),3	// put region number bits in place
+
+	srlz.d
+	LOAD_PHYSICAL(p6, r19, swapper_pg_dir)	// region 5 is rooted at swapper_pg_dir
+
+	.pred.rel "mutex", p6, p7
+(p6)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
+(p7)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
+	;;
+(p6)	dep r17=r18,r19,3,(PAGE_SHIFT-3)	// r17=pgd_offset for region 5
+(p7)	dep r17=r18,r17,3,(PAGE_SHIFT-6)	// r17=pgd_offset for region[0-4]
+	cmp.eq p7,p6=0,r21			// unused address bits all zeroes?
+#if CONFIG_PGTABLE_LEVELS == 4
+	shr.u r28=r22,PUD_SHIFT			// shift pud index into position
+#else
+	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
+#endif
+	;;
+	ld8 r17=[r17]				// get *pgd (may be 0)
+	;;
+(p7)	cmp.eq p6,p7=r17,r0			// was pgd_present(*pgd) == NULL?
+#if CONFIG_PGTABLE_LEVELS == 4
+	dep r28=r28,r17,3,(PAGE_SHIFT-3)	// r28=pud_offset(pgd,addr)
+	;;
+	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
+(p7)	ld8 r29=[r28]				// get *pud (may be 0)
+	;;
+(p7)	cmp.eq.or.andcm p6,p7=r29,r0		// was pud_present(*pud) == NULL?
+	dep r17=r18,r29,3,(PAGE_SHIFT-3)	// r17=pmd_offset(pud,addr)
+#else
+	dep r17=r18,r17,3,(PAGE_SHIFT-3)	// r17=pmd_offset(pgd,addr)
+#endif
+	;;
+(p7)	ld8 r20=[r17]				// get *pmd (may be 0)
+	shr.u r19=r22,PAGE_SHIFT		// shift pte index into position
+	;;
+(p7)	cmp.eq.or.andcm p6,p7=r20,r0		// was pmd_present(*pmd) == NULL?
+	dep r21=r19,r20,3,(PAGE_SHIFT-3)	// r21=pte_offset(pmd,addr)
+	;;
+(p7)	ld8 r18=[r21]				// read *pte
+	MOV_FROM_ISR(r19)			// cr.isr bit 32 tells us if this is an insn miss
+	;;
+(p7)	tbit.z p6,p7=r18,_PAGE_P_BIT		// page present bit cleared?
+	MOV_FROM_IHA(r22)			// get the VHPT address that caused the TLB miss
+	;;					// avoid RAW on p7
+(p7)	tbit.nz.unc p10,p11=r19,32		// is it an instruction TLB miss?
+	dep r23=0,r20,0,PAGE_SHIFT		// clear low bits to get page address
+	;;
+	ITC_I_AND_D(p10, p11, r18, r24)		// insert the instruction TLB entry and
+						// insert the data TLB entry
+(p6)	br.cond.spnt.many page_fault		// handle bad address/page not present (page fault)
+	MOV_TO_IFA(r22, r24)
+
+#ifdef CONFIG_HUGETLB_PAGE
+	MOV_TO_ITIR(p8, r25, r24)		// change to default page-size for VHPT
+#endif
+
+	/*
+	 * Now compute and insert the TLB entry for the virtual page table.  We never
+	 * execute in a page table page so there is no need to set the exception deferral
+	 * bit.
+	 */
+	adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
+	;;
+	ITC_D(p7, r24, r25)
+	;;
+#ifdef CONFIG_SMP
+	/*
+	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
+	 * cannot possibly affect the following loads:
+	 */
+	dv_serialize_data
+
+	/*
+	 * Re-check pagetable entry.  If they changed, we may have received a ptc.g
+	 * between reading the pagetable and the "itc".  If so, flush the entry we
+	 * inserted and retry.  At this point, we have:
+	 *
+	 * r28 = equivalent of pud_offset(pgd, ifa)
+	 * r17 = equivalent of pmd_offset(pud, ifa)
+	 * r21 = equivalent of pte_offset(pmd, ifa)
+	 *
+	 * r29 = *pud
+	 * r20 = *pmd
+	 * r18 = *pte
+	 */
+	ld8 r25=[r21]				// read *pte again
+	ld8 r26=[r17]				// read *pmd again
+#if CONFIG_PGTABLE_LEVELS == 4
+	ld8 r19=[r28]				// read *pud again
+#endif
+	cmp.ne p6,p7=r0,r0
+	;;
+	cmp.ne.or.andcm p6,p7=r26,r20		// did *pmd change
+#if CONFIG_PGTABLE_LEVELS == 4
+	cmp.ne.or.andcm p6,p7=r19,r29		// did *pud change
+#endif
+	mov r27=PAGE_SHIFT<<2
+	;;
+(p6)	ptc.l r22,r27				// purge PTE page translation
+(p7)	cmp.ne.or.andcm p6,p7=r25,r18		// did *pte change
+	;;
+(p6)	ptc.l r16,r27				// purge translation
+#endif
+
+	mov pr=r31,-1				// restore predicate registers
+	RFI
+END(vhpt_miss)
+
+	.org ia64_ivt+0x400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x0400 Entry 1 (size 64 bundles) ITLB (21)
+ENTRY(itlb_miss)
+	DBG_FAULT(1)
+	/*
+	 * The ITLB handler accesses the PTE via the virtually mapped linear
+	 * page table.  If a nested TLB miss occurs, we switch into physical
+	 * mode, walk the page table, and then re-execute the PTE read and
+	 * go on normally after that.
+	 */
+	MOV_FROM_IFA(r16)			// get virtual address
+	mov r29=b0				// save b0
+	mov r31=pr				// save predicates
+.itlb_fault:
+	MOV_FROM_IHA(r17)			// get virtual address of PTE
+	movl r30=1f				// load nested fault continuation point
+	;;
+1:	ld8 r18=[r17]				// read *pte
+	;;
+	mov b0=r29
+	tbit.z p6,p0=r18,_PAGE_P_BIT		// page present bit cleared?
+(p6)	br.cond.spnt page_fault
+	;;
+	ITC_I(p0, r18, r19)
+	;;
+#ifdef CONFIG_SMP
+	/*
+	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
+	 * cannot possibly affect the following loads:
+	 */
+	dv_serialize_data
+
+	ld8 r19=[r17]				// read *pte again and see if same
+	mov r20=PAGE_SHIFT<<2			// setup page size for purge
+	;;
+	cmp.ne p7,p0=r18,r19
+	;;
+(p7)	ptc.l r16,r20
+#endif
+	mov pr=r31,-1
+	RFI
+END(itlb_miss)
+
+	.org ia64_ivt+0x0800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
+ENTRY(dtlb_miss)
+	DBG_FAULT(2)
+	/*
+	 * The DTLB handler accesses the PTE via the virtually mapped linear
+	 * page table.  If a nested TLB miss occurs, we switch into physical
+	 * mode, walk the page table, and then re-execute the PTE read and
+	 * go on normally after that.
+	 */
+	MOV_FROM_IFA(r16)			// get virtual address
+	mov r29=b0				// save b0
+	mov r31=pr				// save predicates
+dtlb_fault:
+	MOV_FROM_IHA(r17)			// get virtual address of PTE
+	movl r30=1f				// load nested fault continuation point
+	;;
+1:	ld8 r18=[r17]				// read *pte
+	;;
+	mov b0=r29
+	tbit.z p6,p0=r18,_PAGE_P_BIT		// page present bit cleared?
+(p6)	br.cond.spnt page_fault
+	;;
+	ITC_D(p0, r18, r19)
+	;;
+#ifdef CONFIG_SMP
+	/*
+	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
+	 * cannot possibly affect the following loads:
+	 */
+	dv_serialize_data
+
+	ld8 r19=[r17]				// read *pte again and see if same
+	mov r20=PAGE_SHIFT<<2			// setup page size for purge
+	;;
+	cmp.ne p7,p0=r18,r19
+	;;
+(p7)	ptc.l r16,r20
+#endif
+	mov pr=r31,-1
+	RFI
+END(dtlb_miss)
+
+	.org ia64_ivt+0x0c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
+ENTRY(alt_itlb_miss)
+	DBG_FAULT(3)
+	MOV_FROM_IFA(r16)	// get address that caused the TLB miss
+	movl r17=PAGE_KERNEL
+	MOV_FROM_IPSR(p0, r21)
+	movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
+	mov r31=pr
+	;;
+#ifdef CONFIG_DISABLE_VHPT
+	shr.u r22=r16,61			// get the region number into r21
+	;;
+	cmp.gt p8,p0=6,r22			// user mode
+	;;
+	THASH(p8, r17, r16, r23)
+	;;
+	MOV_TO_IHA(p8, r17, r23)
+(p8)	mov r29=b0				// save b0
+(p8)	br.cond.dptk .itlb_fault
+#endif
+	extr.u r23=r21,IA64_PSR_CPL0_BIT,2	// extract psr.cpl
+	and r19=r19,r16		// clear ed, reserved bits, and PTE control bits
+	shr.u r18=r16,57	// move address bit 61 to bit 4
+	;;
+	andcm r18=0x10,r18	// bit 4=~address-bit(61)
+	cmp.ne p8,p0=r0,r23	// psr.cpl != 0?
+	or r19=r17,r19		// insert PTE control bits into r19
+	;;
+	or r19=r19,r18		// set bit 4 (uncached) if the access was to region 6
+(p8)	br.cond.spnt page_fault
+	;;
+	ITC_I(p0, r19, r18)	// insert the TLB entry
+	mov pr=r31,-1
+	RFI
+END(alt_itlb_miss)
+
+	.org ia64_ivt+0x1000
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
+ENTRY(alt_dtlb_miss)
+	DBG_FAULT(4)
+	MOV_FROM_IFA(r16)	// get address that caused the TLB miss
+	movl r17=PAGE_KERNEL
+	MOV_FROM_ISR(r20)
+	movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
+	MOV_FROM_IPSR(p0, r21)
+	mov r31=pr
+	mov r24=PERCPU_ADDR
+	;;
+#ifdef CONFIG_DISABLE_VHPT
+	shr.u r22=r16,61			// get the region number into r21
+	;;
+	cmp.gt p8,p0=6,r22			// access to region 0-5
+	;;
+	THASH(p8, r17, r16, r25)
+	;;
+	MOV_TO_IHA(p8, r17, r25)
+(p8)	mov r29=b0				// save b0
+(p8)	br.cond.dptk dtlb_fault
+#endif
+	cmp.ge p10,p11=r16,r24			// access to per_cpu_data?
+	tbit.z p12,p0=r16,61			// access to region 6?
+	mov r25=PERCPU_PAGE_SHIFT << 2
+	mov r26=PERCPU_PAGE_SIZE
+	nop.m 0
+	nop.b 0
+	;;
+(p10)	mov r19=IA64_KR(PER_CPU_DATA)
+(p11)	and r19=r19,r16				// clear non-ppn fields
+	extr.u r23=r21,IA64_PSR_CPL0_BIT,2	// extract psr.cpl
+	and r22=IA64_ISR_CODE_MASK,r20		// get the isr.code field
+	tbit.nz p6,p7=r20,IA64_ISR_SP_BIT	// is speculation bit on?
+	tbit.nz p9,p0=r20,IA64_ISR_NA_BIT	// is non-access bit on?
+	;;
+(p10)	sub r19=r19,r26
+	MOV_TO_ITIR(p10, r25, r24)
+	cmp.ne p8,p0=r0,r23
+(p9)	cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22	// check isr.code field
+(p12)	dep r17=-1,r17,4,1			// set ma=UC for region 6 addr
+(p8)	br.cond.spnt page_fault
+
+	dep r21=-1,r21,IA64_PSR_ED_BIT,1
+	;;
+	or r19=r19,r17		// insert PTE control bits into r19
+	MOV_TO_IPSR(p6, r21, r24)
+	;;
+	ITC_D(p7, r19, r18)	// insert the TLB entry
+	mov pr=r31,-1
+	RFI
+END(alt_dtlb_miss)
+
+	.org ia64_ivt+0x1400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
+ENTRY(nested_dtlb_miss)
+	/*
+	 * In the absence of kernel bugs, we get here when the virtually mapped linear
+	 * page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
+	 * Access-bit, or Data Access-bit faults).  If the DTLB entry for the virtual page
+	 * table is missing, a nested TLB miss fault is triggered and control is
+	 * transferred to this point.  When this happens, we lookup the pte for the
+	 * faulting address by walking the page table in physical mode and return to the
+	 * continuation point passed in register r30 (or call page_fault if the address is
+	 * not mapped).
+	 *
+	 * Input:	r16:	faulting address
+	 *		r29:	saved b0
+	 *		r30:	continuation address
+	 *		r31:	saved pr
+	 *
+	 * Output:	r17:	physical address of PTE of faulting address
+	 *		r29:	saved b0
+	 *		r30:	continuation address
+	 *		r31:	saved pr
+	 *
+	 * Clobbered:	b0, r18, r19, r21, r22, psr.dt (cleared)
+	 */
+	RSM_PSR_DT				// switch to using physical data addressing
+	mov r19=IA64_KR(PT_BASE)		// get the page table base address
+	shl r21=r16,3				// shift bit 60 into sign bit
+	MOV_FROM_ITIR(r18)
+	;;
+	shr.u r17=r16,61			// get the region number into r17
+	extr.u r18=r18,2,6			// get the faulting page size
+	;;
+	cmp.eq p6,p7=5,r17			// is faulting address in region 5?
+	add r22=-PAGE_SHIFT,r18			// adjustment for hugetlb address
+	add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
+	;;
+	shr.u r22=r16,r22
+	shr.u r18=r16,r18
+(p7)	dep r17=r17,r19,(PAGE_SHIFT-3),3	// put region number bits in place
+
+	srlz.d
+	LOAD_PHYSICAL(p6, r19, swapper_pg_dir)	// region 5 is rooted at swapper_pg_dir
+
+	.pred.rel "mutex", p6, p7
+(p6)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
+(p7)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
+	;;
+(p6)	dep r17=r18,r19,3,(PAGE_SHIFT-3)	// r17=pgd_offset for region 5
+(p7)	dep r17=r18,r17,3,(PAGE_SHIFT-6)	// r17=pgd_offset for region[0-4]
+	cmp.eq p7,p6=0,r21			// unused address bits all zeroes?
+#if CONFIG_PGTABLE_LEVELS == 4
+	shr.u r18=r22,PUD_SHIFT			// shift pud index into position
+#else
+	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
+#endif
+	;;
+	ld8 r17=[r17]				// get *pgd (may be 0)
+	;;
+(p7)	cmp.eq p6,p7=r17,r0			// was pgd_present(*pgd) == NULL?
+	dep r17=r18,r17,3,(PAGE_SHIFT-3)	// r17=p[u|m]d_offset(pgd,addr)
+	;;
+#if CONFIG_PGTABLE_LEVELS == 4
+(p7)	ld8 r17=[r17]				// get *pud (may be 0)
+	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
+	;;
+(p7)	cmp.eq.or.andcm p6,p7=r17,r0		// was pud_present(*pud) == NULL?
+	dep r17=r18,r17,3,(PAGE_SHIFT-3)	// r17=pmd_offset(pud,addr)
+	;;
+#endif
+(p7)	ld8 r17=[r17]				// get *pmd (may be 0)
+	shr.u r19=r22,PAGE_SHIFT		// shift pte index into position
+	;;
+(p7)	cmp.eq.or.andcm p6,p7=r17,r0		// was pmd_present(*pmd) == NULL?
+	dep r17=r19,r17,3,(PAGE_SHIFT-3)	// r17=pte_offset(pmd,addr);
+(p6)	br.cond.spnt page_fault
+	mov b0=r30
+	br.sptk.many b0				// return to continuation point
+END(nested_dtlb_miss)
+
+	.org ia64_ivt+0x1800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
+ENTRY(ikey_miss)
+	DBG_FAULT(6)
+	FAULT(6)
+END(ikey_miss)
+
+	.org ia64_ivt+0x1c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
+ENTRY(dkey_miss)
+	DBG_FAULT(7)
+	FAULT(7)
+END(dkey_miss)
+
+	.org ia64_ivt+0x2000
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
+ENTRY(dirty_bit)
+	DBG_FAULT(8)
+	/*
+	 * What we do here is to simply turn on the dirty bit in the PTE.  We need to
+	 * update both the page-table and the TLB entry.  To efficiently access the PTE,
+	 * we address it through the virtual page table.  Most likely, the TLB entry for
+	 * the relevant virtual page table page is still present in the TLB so we can
+	 * normally do this without additional TLB misses.  In case the necessary virtual
+	 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
+	 * up the physical address of the L3 PTE and then continue at label 1 below.
+	 */
+	MOV_FROM_IFA(r16)			// get the address that caused the fault
+	movl r30=1f				// load continuation point in case of nested fault
+	;;
+	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
+	mov r29=b0				// save b0 in case of nested fault
+	mov r31=pr				// save pr
+#ifdef CONFIG_SMP
+	mov r28=ar.ccv				// save ar.ccv
+	;;
+1:	ld8 r18=[r17]
+	;;					// avoid RAW on r18
+	mov ar.ccv=r18				// set compare value for cmpxchg
+	or r25=_PAGE_D|_PAGE_A,r18		// set the dirty and accessed bits
+	tbit.z p7,p6 = r18,_PAGE_P_BIT		// Check present bit
+	;;
+(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only update if page is present
+	mov r24=PAGE_SHIFT<<2
+	;;
+(p6)	cmp.eq p6,p7=r26,r18			// Only compare if page is present
+	;;
+	ITC_D(p6, r25, r18)			// install updated PTE
+	;;
+	/*
+	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
+	 * cannot possibly affect the following loads:
+	 */
+	dv_serialize_data
+
+	ld8 r18=[r17]				// read PTE again
+	;;
+	cmp.eq p6,p7=r18,r25			// is it same as the newly installed
+	;;
+(p7)	ptc.l r16,r24
+	mov b0=r29				// restore b0
+	mov ar.ccv=r28
+#else
+	;;
+1:	ld8 r18=[r17]
+	;;					// avoid RAW on r18
+	or r18=_PAGE_D|_PAGE_A,r18		// set the dirty and accessed bits
+	mov b0=r29				// restore b0
+	;;
+	st8 [r17]=r18				// store back updated PTE
+	ITC_D(p0, r18, r16)			// install updated PTE
+#endif
+	mov pr=r31,-1				// restore pr
+	RFI
+END(dirty_bit)
+
+	.org ia64_ivt+0x2400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
+ENTRY(iaccess_bit)
+	DBG_FAULT(9)
+	// Like Entry 8, except for instruction access
+	MOV_FROM_IFA(r16)			// get the address that caused the fault
+	movl r30=1f				// load continuation point in case of nested fault
+	mov r31=pr				// save predicates
+#ifdef CONFIG_ITANIUM
+	/*
+	 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
+	 */
+	MOV_FROM_IPSR(p0, r17)
+	;;
+	MOV_FROM_IIP(r18)
+	tbit.z p6,p0=r17,IA64_PSR_IS_BIT	// IA64 instruction set?
+	;;
+(p6)	mov r16=r18				// if so, use cr.iip instead of cr.ifa
+#endif /* CONFIG_ITANIUM */
+	;;
+	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
+	mov r29=b0				// save b0 in case of nested fault)
+#ifdef CONFIG_SMP
+	mov r28=ar.ccv				// save ar.ccv
+	;;
+1:	ld8 r18=[r17]
+	;;
+	mov ar.ccv=r18				// set compare value for cmpxchg
+	or r25=_PAGE_A,r18			// set the accessed bit
+	tbit.z p7,p6 = r18,_PAGE_P_BIT	 	// Check present bit
+	;;
+(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only if page present
+	mov r24=PAGE_SHIFT<<2
+	;;
+(p6)	cmp.eq p6,p7=r26,r18			// Only if page present
+	;;
+	ITC_I(p6, r25, r26)			// install updated PTE
+	;;
+	/*
+	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
+	 * cannot possibly affect the following loads:
+	 */
+	dv_serialize_data
+
+	ld8 r18=[r17]				// read PTE again
+	;;
+	cmp.eq p6,p7=r18,r25			// is it same as the newly installed
+	;;
+(p7)	ptc.l r16,r24
+	mov b0=r29				// restore b0
+	mov ar.ccv=r28
+#else /* !CONFIG_SMP */
+	;;
+1:	ld8 r18=[r17]
+	;;
+	or r18=_PAGE_A,r18			// set the accessed bit
+	mov b0=r29				// restore b0
+	;;
+	st8 [r17]=r18				// store back updated PTE
+	ITC_I(p0, r18, r16)			// install updated PTE
+#endif /* !CONFIG_SMP */
+	mov pr=r31,-1
+	RFI
+END(iaccess_bit)
+
+	.org ia64_ivt+0x2800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
+ENTRY(daccess_bit)
+	DBG_FAULT(10)
+	// Like Entry 8, except for data access
+	MOV_FROM_IFA(r16)			// get the address that caused the fault
+	movl r30=1f				// load continuation point in case of nested fault
+	;;
+	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
+	mov r31=pr
+	mov r29=b0				// save b0 in case of nested fault)
+#ifdef CONFIG_SMP
+	mov r28=ar.ccv				// save ar.ccv
+	;;
+1:	ld8 r18=[r17]
+	;;					// avoid RAW on r18
+	mov ar.ccv=r18				// set compare value for cmpxchg
+	or r25=_PAGE_A,r18			// set the dirty bit
+	tbit.z p7,p6 = r18,_PAGE_P_BIT		// Check present bit
+	;;
+(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only if page is present
+	mov r24=PAGE_SHIFT<<2
+	;;
+(p6)	cmp.eq p6,p7=r26,r18			// Only if page is present
+	;;
+	ITC_D(p6, r25, r26)			// install updated PTE
+	/*
+	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
+	 * cannot possibly affect the following loads:
+	 */
+	dv_serialize_data
+	;;
+	ld8 r18=[r17]				// read PTE again
+	;;
+	cmp.eq p6,p7=r18,r25			// is it same as the newly installed
+	;;
+(p7)	ptc.l r16,r24
+	mov ar.ccv=r28
+#else
+	;;
+1:	ld8 r18=[r17]
+	;;					// avoid RAW on r18
+	or r18=_PAGE_A,r18			// set the accessed bit
+	;;
+	st8 [r17]=r18				// store back updated PTE
+	ITC_D(p0, r18, r16)			// install updated PTE
+#endif
+	mov b0=r29				// restore b0
+	mov pr=r31,-1
+	RFI
+END(daccess_bit)
+
+	.org ia64_ivt+0x2c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
+ENTRY(break_fault)
+	/*
+	 * The streamlined system call entry/exit paths only save/restore the initial part
+	 * of pt_regs.  This implies that the callers of system-calls must adhere to the
+	 * normal procedure calling conventions.
+	 *
+	 *   Registers to be saved & restored:
+	 *	CR registers: cr.ipsr, cr.iip, cr.ifs
+	 *	AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
+	 * 	others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
+	 *   Registers to be restored only:
+	 * 	r8-r11: output value from the system call.
+	 *
+	 * During system call exit, scratch registers (including r15) are modified/cleared
+	 * to prevent leaking bits from kernel to user level.
+	 */
+	DBG_FAULT(11)
+	mov.m r16=IA64_KR(CURRENT)		// M2 r16 <- current task (12 cyc)
+	MOV_FROM_IPSR(p0, r29)			// M2 (12 cyc)
+	mov r31=pr				// I0 (2 cyc)
+
+	MOV_FROM_IIM(r17)			// M2 (2 cyc)
+	mov.m r27=ar.rsc			// M2 (12 cyc)
+	mov r18=__IA64_BREAK_SYSCALL		// A
+
+	mov.m ar.rsc=0				// M2
+	mov.m r21=ar.fpsr			// M2 (12 cyc)
+	mov r19=b6				// I0 (2 cyc)
+	;;
+	mov.m r23=ar.bspstore			// M2 (12 cyc)
+	mov.m r24=ar.rnat			// M2 (5 cyc)
+	mov.i r26=ar.pfs			// I0 (2 cyc)
+
+	invala					// M0|1
+	nop.m 0					// M
+	mov r20=r1				// A			save r1
+
+	nop.m 0
+	movl r30=sys_call_table			// X
+
+	MOV_FROM_IIP(r28)			// M2 (2 cyc)
+	cmp.eq p0,p7=r18,r17			// I0 is this a system call?
+(p7)	br.cond.spnt non_syscall		// B  no ->
+	//
+	// From this point on, we are definitely on the syscall-path
+	// and we can use (non-banked) scratch registers.
+	//
+///////////////////////////////////////////////////////////////////////
+	mov r1=r16				// A    move task-pointer to "addl"-addressable reg
+	mov r2=r16				// A    setup r2 for ia64_syscall_setup
+	add r9=TI_FLAGS+IA64_TASK_SIZE,r16	// A	r9 = &current_thread_info()->flags
+
+	adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
+	adds r15=-1024,r15			// A    subtract 1024 from syscall number
+	mov r3=NR_syscalls - 1
+	;;
+	ld1.bias r17=[r16]			// M0|1 r17 = current->thread.on_ustack flag
+	ld4 r9=[r9]				// M0|1 r9 = current_thread_info()->flags
+	extr.u r8=r29,41,2			// I0   extract ei field from cr.ipsr
+
+	shladd r30=r15,3,r30			// A    r30 = sys_call_table + 8*(syscall-1024)
+	addl r22=IA64_RBS_OFFSET,r1		// A    compute base of RBS
+	cmp.leu p6,p7=r15,r3			// A    syscall number in range?
+	;;
+
+	lfetch.fault.excl.nt1 [r22]		// M0|1 prefetch RBS
+(p6)	ld8 r30=[r30]				// M0|1 load address of syscall entry point
+	tnat.nz.or p7,p0=r15			// I0	is syscall nr a NaT?
+
+	mov.m ar.bspstore=r22			// M2   switch to kernel RBS
+	cmp.eq p8,p9=2,r8			// A    isr.ei==2?
+	;;
+
+(p8)	mov r8=0				// A    clear ei to 0
+(p7)	movl r30=sys_ni_syscall			// X
+
+(p8)	adds r28=16,r28				// A    switch cr.iip to next bundle
+(p9)	adds r8=1,r8				// A    increment ei to next slot
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	;;
+	mov b6=r30				// I0   setup syscall handler branch reg early
+#else
+	nop.i 0
+	;;
+#endif
+
+	mov.m r25=ar.unat			// M2 (5 cyc)
+	dep r29=r8,r29,41,2			// I0   insert new ei into cr.ipsr
+	adds r15=1024,r15			// A    restore original syscall number
+	//
+	// If any of the above loads miss in L1D, we'll stall here until
+	// the data arrives.
+	//
+///////////////////////////////////////////////////////////////////////
+	st1 [r16]=r0				// M2|3 clear current->thread.on_ustack flag
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	MOV_FROM_ITC(p0, p14, r30, r18)		// M    get cycle for accounting
+#else
+	mov b6=r30				// I0   setup syscall handler branch reg early
+#endif
+	cmp.eq pKStk,pUStk=r0,r17		// A    were we on kernel stacks already?
+
+	and r9=_TIF_SYSCALL_TRACEAUDIT,r9	// A    mask trace or audit
+	mov r18=ar.bsp				// M2 (12 cyc)
+(pKStk)	br.cond.spnt .break_fixup		// B	we're already in kernel-mode -- fix up RBS
+	;;
+.back_from_break_fixup:
+(pUStk)	addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A    compute base of memory stack
+	cmp.eq p14,p0=r9,r0			// A    are syscalls being traced/audited?
+	br.call.sptk.many b7=ia64_syscall_setup	// B
+1:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+	// mov.m r30=ar.itc is called in advance, and r13 is current
+	add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13	// A
+	add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13	// A
+(pKStk)	br.cond.spnt .skip_accounting		// B	unlikely skip
+	;;
+	ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP	// M  get last stamp
+	ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE	// M  time at leave
+	;;
+	ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME	// M  cumulated stime
+	ld8 r21=[r17]				// M  cumulated utime
+	sub r22=r19,r18				// A  stime before leave
+	;;
+	st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP	// M  update stamp
+	sub r18=r30,r19				// A  elapsed time in user
+	;;
+	add r20=r20,r22				// A  sum stime
+	add r21=r21,r18				// A  sum utime
+	;;
+	st8 [r16]=r20				// M  update stime
+	st8 [r17]=r21				// M  update utime
+	;;
+.skip_accounting:
+#endif
+	mov ar.rsc=0x3				// M2   set eager mode, pl 0, LE, loadrs=0
+	nop 0
+	BSW_1(r2, r14)				// B (6 cyc) regs are saved, switch to bank 1
+	;;
+
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r16)	// M2	now it's safe to re-enable intr.-collection
+						// M0   ensure interruption collection is on
+	movl r3=ia64_ret_from_syscall		// X
+	;;
+	mov rp=r3				// I0   set the real return addr
+(p10)	br.cond.spnt.many ia64_ret_from_syscall	// B    return if bad call-frame or r15 is a NaT
+
+	SSM_PSR_I(p15, p15, r16)		// M2   restore psr.i
+(p14)	br.call.sptk.many b6=b6			// B    invoke syscall-handker (ignore return addr)
+	br.cond.spnt.many ia64_trace_syscall	// B	do syscall-tracing thingamagic
+	// NOT REACHED
+///////////////////////////////////////////////////////////////////////
+	// On entry, we optimistically assumed that we're coming from user-space.
+	// For the rare cases where a system-call is done from within the kernel,
+	// we fix things up at this point:
+.break_fixup:
+	add r1=-IA64_PT_REGS_SIZE,sp		// A    allocate space for pt_regs structure
+	mov ar.rnat=r24				// M2	restore kernel's AR.RNAT
+	;;
+	mov ar.bspstore=r23			// M2	restore kernel's AR.BSPSTORE
+	br.cond.sptk .back_from_break_fixup
+END(break_fault)
+
+	.org ia64_ivt+0x3000
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
+ENTRY(interrupt)
+	/* interrupt handler has become too big to fit this area. */
+	br.sptk.many __interrupt
+END(interrupt)
+
+	.org ia64_ivt+0x3400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x3400 Entry 13 (size 64 bundles) Reserved
+	DBG_FAULT(13)
+	FAULT(13)
+
+	.org ia64_ivt+0x3800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x3800 Entry 14 (size 64 bundles) Reserved
+	DBG_FAULT(14)
+	FAULT(14)
+
+	/*
+	 * There is no particular reason for this code to be here, other than that
+	 * there happens to be space here that would go unused otherwise.  If this
+	 * fault ever gets "unreserved", simply moved the following code to a more
+	 * suitable spot...
+	 *
+	 * ia64_syscall_setup() is a separate subroutine so that it can
+	 *	allocate stacked registers so it can safely demine any
+	 *	potential NaT values from the input registers.
+	 *
+	 * On entry:
+	 *	- executing on bank 0 or bank 1 register set (doesn't matter)
+	 *	-  r1: stack pointer
+	 *	-  r2: current task pointer
+	 *	-  r3: preserved
+	 *	- r11: original contents (saved ar.pfs to be saved)
+	 *	- r12: original contents (sp to be saved)
+	 *	- r13: original contents (tp to be saved)
+	 *	- r15: original contents (syscall # to be saved)
+	 *	- r18: saved bsp (after switching to kernel stack)
+	 *	- r19: saved b6
+	 *	- r20: saved r1 (gp)
+	 *	- r21: saved ar.fpsr
+	 *	- r22: kernel's register backing store base (krbs_base)
+	 *	- r23: saved ar.bspstore
+	 *	- r24: saved ar.rnat
+	 *	- r25: saved ar.unat
+	 *	- r26: saved ar.pfs
+	 *	- r27: saved ar.rsc
+	 *	- r28: saved cr.iip
+	 *	- r29: saved cr.ipsr
+	 *	- r30: ar.itc for accounting (don't touch)
+	 *	- r31: saved pr
+	 *	-  b0: original contents (to be saved)
+	 * On exit:
+	 *	-  p10: TRUE if syscall is invoked with more than 8 out
+	 *		registers or r15's Nat is true
+	 *	-  r1: kernel's gp
+	 *	-  r3: preserved (same as on entry)
+	 *	-  r8: -EINVAL if p10 is true
+	 *	- r12: points to kernel stack
+	 *	- r13: points to current task
+	 *	- r14: preserved (same as on entry)
+	 *	- p13: preserved
+	 *	- p15: TRUE if interrupts need to be re-enabled
+	 *	- ar.fpsr: set to kernel settings
+	 *	-  b6: preserved (same as on entry)
+	 */
+GLOBAL_ENTRY(ia64_syscall_setup)
+#if PT(B6) != 0
+# error This code assumes that b6 is the first field in pt_regs.
+#endif
+	st8 [r1]=r19				// save b6
+	add r16=PT(CR_IPSR),r1			// initialize first base pointer
+	add r17=PT(R11),r1			// initialize second base pointer
+	;;
+	alloc r19=ar.pfs,8,0,0,0		// ensure in0-in7 are writable
+	st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR)	// save cr.ipsr
+	tnat.nz p8,p0=in0
+
+	st8.spill [r17]=r11,PT(CR_IIP)-PT(R11)	// save r11
+	tnat.nz p9,p0=in1
+(pKStk)	mov r18=r0				// make sure r18 isn't NaT
+	;;
+
+	st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS)	// save ar.pfs
+	st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP)	// save cr.iip
+	mov r28=b0				// save b0 (2 cyc)
+	;;
+
+	st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT)	// save ar.unat
+	dep r19=0,r19,38,26			// clear all bits but 0..37 [I0]
+(p8)	mov in0=-1
+	;;
+
+	st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS)	// store ar.pfs.pfm in cr.ifs
+	extr.u r11=r19,7,7	// I0		// get sol of ar.pfs
+	and r8=0x7f,r19		// A		// get sof of ar.pfs
+
+	st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
+	tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
+(p9)	mov in1=-1
+	;;
+
+(pUStk) sub r18=r18,r22				// r18=RSE.ndirty*8
+	tnat.nz p10,p0=in2
+	add r11=8,r11
+	;;
+(pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16		// skip over ar_rnat field
+(pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17	// skip over ar_bspstore field
+	tnat.nz p11,p0=in3
+	;;
+(p10)	mov in2=-1
+	tnat.nz p12,p0=in4				// [I0]
+(p11)	mov in3=-1
+	;;
+(pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT)	// save ar.rnat
+(pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE)	// save ar.bspstore
+	shl r18=r18,16				// compute ar.rsc to be used for "loadrs"
+	;;
+	st8 [r16]=r31,PT(LOADRS)-PT(PR)		// save predicates
+	st8 [r17]=r28,PT(R1)-PT(B0)		// save b0
+	tnat.nz p13,p0=in5				// [I0]
+	;;
+	st8 [r16]=r18,PT(R12)-PT(LOADRS)	// save ar.rsc value for "loadrs"
+	st8.spill [r17]=r20,PT(R13)-PT(R1)	// save original r1
+(p12)	mov in4=-1
+	;;
+
+.mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12)	// save r12
+.mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13)		// save r13
+(p13)	mov in5=-1
+	;;
+	st8 [r16]=r21,PT(R8)-PT(AR_FPSR)	// save ar.fpsr
+	tnat.nz p13,p0=in6
+	cmp.lt p10,p9=r11,r8	// frame size can't be more than local+8
+	;;
+	mov r8=1
+(p9)	tnat.nz p10,p0=r15
+	adds r12=-16,r1		// switch to kernel memory stack (with 16 bytes of scratch)
+
+	st8.spill [r17]=r15			// save r15
+	tnat.nz p8,p0=in7
+	nop.i 0
+
+	mov r13=r2				// establish `current'
+	movl r1=__gp				// establish kernel global pointer
+	;;
+	st8 [r16]=r8		// ensure pt_regs.r8 != 0 (see handle_syscall_error)
+(p13)	mov in6=-1
+(p8)	mov in7=-1
+
+	cmp.eq pSys,pNonSys=r0,r0		// set pSys=1, pNonSys=0
+	movl r17=FPSR_DEFAULT
+	;;
+	mov.m ar.fpsr=r17			// set ar.fpsr to kernel default value
+(p10)	mov r8=-EINVAL
+	br.ret.sptk.many b7
+END(ia64_syscall_setup)
+
+	.org ia64_ivt+0x3c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x3c00 Entry 15 (size 64 bundles) Reserved
+	DBG_FAULT(15)
+	FAULT(15)
+
+	.org ia64_ivt+0x4000
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x4000 Entry 16 (size 64 bundles) Reserved
+	DBG_FAULT(16)
+	FAULT(16)
+
+#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
+	/*
+	 * There is no particular reason for this code to be here, other than
+	 * that there happens to be space here that would go unused otherwise.
+	 * If this fault ever gets "unreserved", simply moved the following
+	 * code to a more suitable spot...
+	 *
+	 * account_sys_enter is called from SAVE_MIN* macros if accounting is
+	 * enabled and if the macro is entered from user mode.
+	 */
+GLOBAL_ENTRY(account_sys_enter)
+	// mov.m r20=ar.itc is called in advance, and r13 is current
+	add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13
+	add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13
+	;;
+	ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP	// time at last check in kernel
+	ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE	// time at left from kernel
+        ;;
+	ld8 r23=[r16],TI_AC_STAMP-TI_AC_STIME	// cumulated stime
+	ld8 r21=[r17]				// cumulated utime
+	sub r22=r19,r18				// stime before leave kernel
+	;;
+	st8 [r16]=r20,TI_AC_STIME-TI_AC_STAMP	// update stamp
+	sub r18=r20,r19				// elapsed time in user mode
+	;;
+	add r23=r23,r22				// sum stime
+	add r21=r21,r18				// sum utime
+	;;
+	st8 [r16]=r23				// update stime
+	st8 [r17]=r21				// update utime
+	;;
+	br.ret.sptk.many rp
+END(account_sys_enter)
+#endif
+
+	.org ia64_ivt+0x4400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x4400 Entry 17 (size 64 bundles) Reserved
+	DBG_FAULT(17)
+	FAULT(17)
+
+	.org ia64_ivt+0x4800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x4800 Entry 18 (size 64 bundles) Reserved
+	DBG_FAULT(18)
+	FAULT(18)
+
+	.org ia64_ivt+0x4c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x4c00 Entry 19 (size 64 bundles) Reserved
+	DBG_FAULT(19)
+	FAULT(19)
+
+//
+// --- End of long entries, Beginning of short entries
+//
+
+	.org ia64_ivt+0x5000
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
+ENTRY(page_not_present)
+	DBG_FAULT(20)
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
+	/*
+	 * The Linux page fault handler doesn't expect non-present pages to be in
+	 * the TLB.  Flush the existing entry now, so we meet that expectation.
+	 */
+	mov r17=PAGE_SHIFT<<2
+	;;
+	ptc.l r16,r17
+	;;
+	mov r31=pr
+	srlz.d
+	br.sptk.many page_fault
+END(page_not_present)
+
+	.org ia64_ivt+0x5100
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
+ENTRY(key_permission)
+	DBG_FAULT(21)
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
+	mov r31=pr
+	;;
+	srlz.d
+	br.sptk.many page_fault
+END(key_permission)
+
+	.org ia64_ivt+0x5200
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
+ENTRY(iaccess_rights)
+	DBG_FAULT(22)
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
+	mov r31=pr
+	;;
+	srlz.d
+	br.sptk.many page_fault
+END(iaccess_rights)
+
+	.org ia64_ivt+0x5300
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
+ENTRY(daccess_rights)
+	DBG_FAULT(23)
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
+	mov r31=pr
+	;;
+	srlz.d
+	br.sptk.many page_fault
+END(daccess_rights)
+
+	.org ia64_ivt+0x5400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
+ENTRY(general_exception)
+	DBG_FAULT(24)
+	MOV_FROM_ISR(r16)
+	mov r31=pr
+	;;
+	cmp4.eq p6,p0=0,r16
+(p6)	br.sptk.many dispatch_illegal_op_fault
+	;;
+	mov r19=24		// fault number
+	br.sptk.many dispatch_to_fault_handler
+END(general_exception)
+
+	.org ia64_ivt+0x5500
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
+ENTRY(disabled_fp_reg)
+	DBG_FAULT(25)
+	rsm psr.dfh		// ensure we can access fph
+	;;
+	srlz.d
+	mov r31=pr
+	mov r19=25
+	br.sptk.many dispatch_to_fault_handler
+END(disabled_fp_reg)
+
+	.org ia64_ivt+0x5600
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
+ENTRY(nat_consumption)
+	DBG_FAULT(26)
+
+	MOV_FROM_IPSR(p0, r16)
+	MOV_FROM_ISR(r17)
+	mov r31=pr				// save PR
+	;;
+	and r18=0xf,r17				// r18 = cr.ipsr.code{3:0}
+	tbit.z p6,p0=r17,IA64_ISR_NA_BIT
+	;;
+	cmp.ne.or p6,p0=IA64_ISR_CODE_LFETCH,r18
+	dep r16=-1,r16,IA64_PSR_ED_BIT,1
+(p6)	br.cond.spnt 1f		// branch if (cr.ispr.na == 0 || cr.ipsr.code{3:0} != LFETCH)
+	;;
+	MOV_TO_IPSR(p0, r16, r18)
+	mov pr=r31,-1
+	;;
+	RFI
+
+1:	mov pr=r31,-1
+	;;
+	FAULT(26)
+END(nat_consumption)
+
+	.org ia64_ivt+0x5700
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5700 Entry 27 (size 16 bundles) Speculation (40)
+ENTRY(speculation_vector)
+	DBG_FAULT(27)
+	/*
+	 * A [f]chk.[as] instruction needs to take the branch to the recovery code but
+	 * this part of the architecture is not implemented in hardware on some CPUs, such
+	 * as Itanium.  Thus, in general we need to emulate the behavior.  IIM contains
+	 * the relative target (not yet sign extended).  So after sign extending it we
+	 * simply add it to IIP.  We also need to reset the EI field of the IPSR to zero,
+	 * i.e., the slot to restart into.
+	 *
+	 * cr.imm contains zero_ext(imm21)
+	 */
+	MOV_FROM_IIM(r18)
+	;;
+	MOV_FROM_IIP(r17)
+	shl r18=r18,43			// put sign bit in position (43=64-21)
+	;;
+
+	MOV_FROM_IPSR(p0, r16)
+	shr r18=r18,39			// sign extend (39=43-4)
+	;;
+
+	add r17=r17,r18			// now add the offset
+	;;
+	MOV_TO_IIP(r17, r19)
+	dep r16=0,r16,41,2		// clear EI
+	;;
+
+	MOV_TO_IPSR(p0, r16, r19)
+	;;
+
+	RFI
+END(speculation_vector)
+
+	.org ia64_ivt+0x5800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5800 Entry 28 (size 16 bundles) Reserved
+	DBG_FAULT(28)
+	FAULT(28)
+
+	.org ia64_ivt+0x5900
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
+ENTRY(debug_vector)
+	DBG_FAULT(29)
+	FAULT(29)
+END(debug_vector)
+
+	.org ia64_ivt+0x5a00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
+ENTRY(unaligned_access)
+	DBG_FAULT(30)
+	mov r31=pr		// prepare to save predicates
+	;;
+	br.sptk.many dispatch_unaligned_handler
+END(unaligned_access)
+
+	.org ia64_ivt+0x5b00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
+ENTRY(unsupported_data_reference)
+	DBG_FAULT(31)
+	FAULT(31)
+END(unsupported_data_reference)
+
+	.org ia64_ivt+0x5c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
+ENTRY(floating_point_fault)
+	DBG_FAULT(32)
+	FAULT(32)
+END(floating_point_fault)
+
+	.org ia64_ivt+0x5d00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
+ENTRY(floating_point_trap)
+	DBG_FAULT(33)
+	FAULT(33)
+END(floating_point_trap)
+
+	.org ia64_ivt+0x5e00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
+ENTRY(lower_privilege_trap)
+	DBG_FAULT(34)
+	FAULT(34)
+END(lower_privilege_trap)
+
+	.org ia64_ivt+0x5f00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
+ENTRY(taken_branch_trap)
+	DBG_FAULT(35)
+	FAULT(35)
+END(taken_branch_trap)
+
+	.org ia64_ivt+0x6000
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
+ENTRY(single_step_trap)
+	DBG_FAULT(36)
+	FAULT(36)
+END(single_step_trap)
+
+	.org ia64_ivt+0x6100
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6100 Entry 37 (size 16 bundles) Reserved
+	DBG_FAULT(37)
+	FAULT(37)
+
+	.org ia64_ivt+0x6200
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6200 Entry 38 (size 16 bundles) Reserved
+	DBG_FAULT(38)
+	FAULT(38)
+
+	.org ia64_ivt+0x6300
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6300 Entry 39 (size 16 bundles) Reserved
+	DBG_FAULT(39)
+	FAULT(39)
+
+	.org ia64_ivt+0x6400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6400 Entry 40 (size 16 bundles) Reserved
+	DBG_FAULT(40)
+	FAULT(40)
+
+	.org ia64_ivt+0x6500
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6500 Entry 41 (size 16 bundles) Reserved
+	DBG_FAULT(41)
+	FAULT(41)
+
+	.org ia64_ivt+0x6600
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6600 Entry 42 (size 16 bundles) Reserved
+	DBG_FAULT(42)
+	FAULT(42)
+
+	.org ia64_ivt+0x6700
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6700 Entry 43 (size 16 bundles) Reserved
+	DBG_FAULT(43)
+	FAULT(43)
+
+	.org ia64_ivt+0x6800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6800 Entry 44 (size 16 bundles) Reserved
+	DBG_FAULT(44)
+	FAULT(44)
+
+	.org ia64_ivt+0x6900
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6900 Entry 45 (size 16 bundles) IA-32 Exeception (17,18,29,41,42,43,44,58,60,61,62,72,73,75,76,77)
+ENTRY(ia32_exception)
+	DBG_FAULT(45)
+	FAULT(45)
+END(ia32_exception)
+
+	.org ia64_ivt+0x6a00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept  (30,31,59,70,71)
+ENTRY(ia32_intercept)
+	DBG_FAULT(46)
+	FAULT(46)
+END(ia32_intercept)
+
+	.org ia64_ivt+0x6b00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt  (74)
+ENTRY(ia32_interrupt)
+	DBG_FAULT(47)
+	FAULT(47)
+END(ia32_interrupt)
+
+	.org ia64_ivt+0x6c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6c00 Entry 48 (size 16 bundles) Reserved
+	DBG_FAULT(48)
+	FAULT(48)
+
+	.org ia64_ivt+0x6d00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6d00 Entry 49 (size 16 bundles) Reserved
+	DBG_FAULT(49)
+	FAULT(49)
+
+	.org ia64_ivt+0x6e00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6e00 Entry 50 (size 16 bundles) Reserved
+	DBG_FAULT(50)
+	FAULT(50)
+
+	.org ia64_ivt+0x6f00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x6f00 Entry 51 (size 16 bundles) Reserved
+	DBG_FAULT(51)
+	FAULT(51)
+
+	.org ia64_ivt+0x7000
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7000 Entry 52 (size 16 bundles) Reserved
+	DBG_FAULT(52)
+	FAULT(52)
+
+	.org ia64_ivt+0x7100
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7100 Entry 53 (size 16 bundles) Reserved
+	DBG_FAULT(53)
+	FAULT(53)
+
+	.org ia64_ivt+0x7200
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7200 Entry 54 (size 16 bundles) Reserved
+	DBG_FAULT(54)
+	FAULT(54)
+
+	.org ia64_ivt+0x7300
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7300 Entry 55 (size 16 bundles) Reserved
+	DBG_FAULT(55)
+	FAULT(55)
+
+	.org ia64_ivt+0x7400
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7400 Entry 56 (size 16 bundles) Reserved
+	DBG_FAULT(56)
+	FAULT(56)
+
+	.org ia64_ivt+0x7500
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7500 Entry 57 (size 16 bundles) Reserved
+	DBG_FAULT(57)
+	FAULT(57)
+
+	.org ia64_ivt+0x7600
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7600 Entry 58 (size 16 bundles) Reserved
+	DBG_FAULT(58)
+	FAULT(58)
+
+	.org ia64_ivt+0x7700
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7700 Entry 59 (size 16 bundles) Reserved
+	DBG_FAULT(59)
+	FAULT(59)
+
+	.org ia64_ivt+0x7800
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7800 Entry 60 (size 16 bundles) Reserved
+	DBG_FAULT(60)
+	FAULT(60)
+
+	.org ia64_ivt+0x7900
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7900 Entry 61 (size 16 bundles) Reserved
+	DBG_FAULT(61)
+	FAULT(61)
+
+	.org ia64_ivt+0x7a00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7a00 Entry 62 (size 16 bundles) Reserved
+	DBG_FAULT(62)
+	FAULT(62)
+
+	.org ia64_ivt+0x7b00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7b00 Entry 63 (size 16 bundles) Reserved
+	DBG_FAULT(63)
+	FAULT(63)
+
+	.org ia64_ivt+0x7c00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7c00 Entry 64 (size 16 bundles) Reserved
+	DBG_FAULT(64)
+	FAULT(64)
+
+	.org ia64_ivt+0x7d00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7d00 Entry 65 (size 16 bundles) Reserved
+	DBG_FAULT(65)
+	FAULT(65)
+
+	.org ia64_ivt+0x7e00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7e00 Entry 66 (size 16 bundles) Reserved
+	DBG_FAULT(66)
+	FAULT(66)
+
+	.org ia64_ivt+0x7f00
+/////////////////////////////////////////////////////////////////////////////////////////
+// 0x7f00 Entry 67 (size 16 bundles) Reserved
+	DBG_FAULT(67)
+	FAULT(67)
+
+	//-----------------------------------------------------------------------------------
+	// call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
+ENTRY(page_fault)
+	SSM_PSR_DT_AND_SRLZ_I
+	;;
+	SAVE_MIN_WITH_COVER
+	alloc r15=ar.pfs,0,0,3,0
+	MOV_FROM_IFA(out0)
+	MOV_FROM_ISR(out1)
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r14, r3)
+	adds r3=8,r2				// set up second base pointer
+	SSM_PSR_I(p15, p15, r14)		// restore psr.i
+	movl r14=ia64_leave_kernel
+	;;
+	SAVE_REST
+	mov rp=r14
+	;;
+	adds out2=16,r12			// out2 = pointer to pt_regs
+	br.call.sptk.many b6=ia64_do_page_fault	// ignore return address
+END(page_fault)
+
+ENTRY(non_syscall)
+	mov ar.rsc=r27			// restore ar.rsc before SAVE_MIN_WITH_COVER
+	;;
+	SAVE_MIN_WITH_COVER
+
+	// There is no particular reason for this code to be here, other than that
+	// there happens to be space here that would go unused otherwise.  If this
+	// fault ever gets "unreserved", simply moved the following code to a more
+	// suitable spot...
+
+	alloc r14=ar.pfs,0,0,2,0
+	MOV_FROM_IIM(out0)
+	add out1=16,sp
+	adds r3=8,r2			// set up second base pointer for SAVE_REST
+
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r15, r24)
+					// guarantee that interruption collection is on
+	SSM_PSR_I(p15, p15, r15)	// restore psr.i
+	movl r15=ia64_leave_kernel
+	;;
+	SAVE_REST
+	mov rp=r15
+	;;
+	br.call.sptk.many b6=ia64_bad_break	// avoid WAW on CFM and ignore return addr
+END(non_syscall)
+
+ENTRY(__interrupt)
+	DBG_FAULT(12)
+	mov r31=pr		// prepare to save predicates
+	;;
+	SAVE_MIN_WITH_COVER	// uses r31; defines r2 and r3
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r14)
+				// ensure everybody knows psr.ic is back on
+	adds r3=8,r2		// set up second base pointer for SAVE_REST
+	;;
+	SAVE_REST
+	;;
+	MCA_RECOVER_RANGE(interrupt)
+	alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
+	MOV_FROM_IVR(out0, r8)	// pass cr.ivr as first arg
+	add out1=16,sp		// pass pointer to pt_regs as second arg
+	;;
+	srlz.d			// make sure we see the effect of cr.ivr
+	movl r14=ia64_leave_kernel
+	;;
+	mov rp=r14
+	br.call.sptk.many b6=ia64_handle_irq
+END(__interrupt)
+
+	/*
+	 * There is no particular reason for this code to be here, other than that
+	 * there happens to be space here that would go unused otherwise.  If this
+	 * fault ever gets "unreserved", simply moved the following code to a more
+	 * suitable spot...
+	 */
+
+ENTRY(dispatch_unaligned_handler)
+	SAVE_MIN_WITH_COVER
+	;;
+	alloc r14=ar.pfs,0,0,2,0		// now it's safe (must be first in insn group!)
+	MOV_FROM_IFA(out0)
+	adds out1=16,sp
+
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
+						// guarantee that interruption collection is on
+	SSM_PSR_I(p15, p15, r3)			// restore psr.i
+	adds r3=8,r2				// set up second base pointer
+	;;
+	SAVE_REST
+	movl r14=ia64_leave_kernel
+	;;
+	mov rp=r14
+	br.sptk.many ia64_prepare_handle_unaligned
+END(dispatch_unaligned_handler)
+
+	/*
+	 * There is no particular reason for this code to be here, other than that
+	 * there happens to be space here that would go unused otherwise.  If this
+	 * fault ever gets "unreserved", simply moved the following code to a more
+	 * suitable spot...
+	 */
+
+ENTRY(dispatch_to_fault_handler)
+	/*
+	 * Input:
+	 *	psr.ic:	off
+	 *	r19:	fault vector number (e.g., 24 for General Exception)
+	 *	r31:	contains saved predicates (pr)
+	 */
+	SAVE_MIN_WITH_COVER_R19
+	alloc r14=ar.pfs,0,0,5,0
+	MOV_FROM_ISR(out1)
+	MOV_FROM_IFA(out2)
+	MOV_FROM_IIM(out3)
+	MOV_FROM_ITIR(out4)
+	;;
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, out0)
+						// guarantee that interruption collection is on
+	mov out0=r15
+	;;
+	SSM_PSR_I(p15, p15, r3)			// restore psr.i
+	adds r3=8,r2				// set up second base pointer for SAVE_REST
+	;;
+	SAVE_REST
+	movl r14=ia64_leave_kernel
+	;;
+	mov rp=r14
+	br.call.sptk.many b6=ia64_fault
+END(dispatch_to_fault_handler)
+
+	/*
+	 * Squatting in this space ...
+	 *
+	 * This special case dispatcher for illegal operation faults allows preserved
+	 * registers to be modified through a callback function (asm only) that is handed
+	 * back from the fault handler in r8. Up to three arguments can be passed to the
+	 * callback function by returning an aggregate with the callback as its first
+	 * element, followed by the arguments.
+	 */
+ENTRY(dispatch_illegal_op_fault)
+	.prologue
+	.body
+	SAVE_MIN_WITH_COVER
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
+				// guarantee that interruption collection is on
+	;;
+	SSM_PSR_I(p15, p15, r3)	// restore psr.i
+	adds r3=8,r2	// set up second base pointer for SAVE_REST
+	;;
+	alloc r14=ar.pfs,0,0,1,0	// must be first in insn group
+	mov out0=ar.ec
+	;;
+	SAVE_REST
+	PT_REGS_UNWIND_INFO(0)
+	;;
+	br.call.sptk.many rp=ia64_illegal_op_fault
+.ret0:	;;
+	alloc r14=ar.pfs,0,0,3,0	// must be first in insn group
+	mov out0=r9
+	mov out1=r10
+	mov out2=r11
+	movl r15=ia64_leave_kernel
+	;;
+	mov rp=r15
+	mov b6=r8
+	;;
+	cmp.ne p6,p0=0,r8
+(p6)	br.call.dpnt.many b6=b6		// call returns to ia64_leave_kernel
+	br.sptk.many ia64_leave_kernel
+END(dispatch_illegal_op_fault)
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
new file mode 100644
index 000000000..ca34e51e8
--- /dev/null
+++ b/arch/ia64/kernel/kprobes.c
@@ -0,0 +1,911 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Kernel Probes (KProbes)
+ *  arch/ia64/kernel/kprobes.c
+ *
+ * Copyright (C) IBM Corporation, 2002, 2004
+ * Copyright (C) Intel Corporation, 2005
+ *
+ * 2005-Apr     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
+ *              <anil.s.keshavamurthy@intel.com> adapted from i386
+ */
+
+#include <linux/kprobes.h>
+#include <linux/ptrace.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/preempt.h>
+#include <linux/extable.h>
+#include <linux/kdebug.h>
+#include <linux/pgtable.h>
+
+#include <asm/sections.h>
+#include <asm/exception.h>
+
+DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
+DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
+struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}};
+
+enum instruction_type {A, I, M, F, B, L, X, u};
+static enum instruction_type bundle_encoding[32][3] = {
+	[0x00] = { M, I, I },
+	[0x01] = { M, I, I },
+	[0x02] = { M, I, I },
+	[0x03] = { M, I, I },
+	[0x04] = { M, L, X },
+	[0x05] = { M, L, X },
+	[0x06] = { u, u, u },
+	[0x07] = { u, u, u },
+	[0x08] = { M, M, I },
+	[0x09] = { M, M, I },
+	[0x0A] = { M, M, I },
+	[0x0B] = { M, M, I },
+	[0x0C] = { M, F, I },
+	[0x0D] = { M, F, I },
+	[0x0E] = { M, M, F },
+	[0x0F] = { M, M, F },
+	[0x10] = { M, I, B },
+	[0x11] = { M, I, B },
+	[0x12] = { M, B, B },
+	[0x13] = { M, B, B },
+	[0x14] = { u, u, u },
+	[0x15] = { u, u, u },
+	[0x16] = { B, B, B },
+	[0x17] = { B, B, B },
+	[0x18] = { M, M, B },
+	[0x19] = { M, M, B },
+	[0x1A] = { u, u, u },
+	[0x1B] = { u, u, u },
+	[0x1C] = { M, F, B },
+	[0x1D] = { M, F, B },
+	[0x1E] = { u, u, u },
+	[0x1F] = { u, u, u },
+};
+
+/* Insert a long branch code */
+static void __kprobes set_brl_inst(void *from, void *to)
+{
+	s64 rel = ((s64) to - (s64) from) >> 4;
+	bundle_t *brl;
+	brl = (bundle_t *) ((u64) from & ~0xf);
+	brl->quad0.template = 0x05;	/* [MLX](stop) */
+	brl->quad0.slot0 = NOP_M_INST;	/* nop.m 0x0 */
+	brl->quad0.slot1_p0 = ((rel >> 20) & 0x7fffffffff) << 2;
+	brl->quad1.slot1_p1 = (((rel >> 20) & 0x7fffffffff) << 2) >> (64 - 46);
+	/* brl.cond.sptk.many.clr rel<<4 (qp=0) */
+	brl->quad1.slot2 = BRL_INST(rel >> 59, rel & 0xfffff);
+}
+
+/*
+ * In this function we check to see if the instruction
+ * is IP relative instruction and update the kprobe
+ * inst flag accordingly
+ */
+static void __kprobes update_kprobe_inst_flag(uint template, uint  slot,
+					      uint major_opcode,
+					      unsigned long kprobe_inst,
+					      struct kprobe *p)
+{
+	p->ainsn.inst_flag = 0;
+	p->ainsn.target_br_reg = 0;
+	p->ainsn.slot = slot;
+
+	/* Check for Break instruction
+	 * Bits 37:40 Major opcode to be zero
+	 * Bits 27:32 X6 to be zero
+	 * Bits 32:35 X3 to be zero
+	 */
+	if ((!major_opcode) && (!((kprobe_inst >> 27) & 0x1FF)) ) {
+		/* is a break instruction */
+	 	p->ainsn.inst_flag |= INST_FLAG_BREAK_INST;
+		return;
+	}
+
+	if (bundle_encoding[template][slot] == B) {
+		switch (major_opcode) {
+		  case INDIRECT_CALL_OPCODE:
+	 		p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG;
+			p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7);
+			break;
+		  case IP_RELATIVE_PREDICT_OPCODE:
+		  case IP_RELATIVE_BRANCH_OPCODE:
+			p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR;
+			break;
+		  case IP_RELATIVE_CALL_OPCODE:
+			p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR;
+			p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG;
+			p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7);
+			break;
+		}
+	} else if (bundle_encoding[template][slot] == X) {
+		switch (major_opcode) {
+		  case LONG_CALL_OPCODE:
+			p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG;
+			p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7);
+		  break;
+		}
+	}
+	return;
+}
+
+/*
+ * In this function we check to see if the instruction
+ * (qp) cmpx.crel.ctype p1,p2=r2,r3
+ * on which we are inserting kprobe is cmp instruction
+ * with ctype as unc.
+ */
+static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot,
+					    uint major_opcode,
+					    unsigned long kprobe_inst)
+{
+	cmp_inst_t cmp_inst;
+	uint ctype_unc = 0;
+
+	if (!((bundle_encoding[template][slot] == I) ||
+		(bundle_encoding[template][slot] == M)))
+		goto out;
+
+	if (!((major_opcode == 0xC) || (major_opcode == 0xD) ||
+		(major_opcode == 0xE)))
+		goto out;
+
+	cmp_inst.l = kprobe_inst;
+	if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) {
+		/* Integer compare - Register Register (A6 type)*/
+		if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0)
+				&&(cmp_inst.f.c == 1))
+			ctype_unc = 1;
+	} else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) {
+		/* Integer compare - Immediate Register (A8 type)*/
+		if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1))
+			ctype_unc = 1;
+	}
+out:
+	return ctype_unc;
+}
+
+/*
+ * In this function we check to see if the instruction
+ * on which we are inserting kprobe is supported.
+ * Returns qp value if supported
+ * Returns -EINVAL if unsupported
+ */
+static int __kprobes unsupported_inst(uint template, uint  slot,
+				      uint major_opcode,
+				      unsigned long kprobe_inst,
+				      unsigned long addr)
+{
+	int qp;
+
+	qp = kprobe_inst & 0x3f;
+	if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) {
+		if (slot == 1 && qp)  {
+			printk(KERN_WARNING "Kprobes on cmp unc "
+					"instruction on slot 1 at <0x%lx> "
+					"is not supported\n", addr);
+			return -EINVAL;
+
+		}
+		qp = 0;
+	}
+	else if (bundle_encoding[template][slot] == I) {
+		if (major_opcode == 0) {
+			/*
+			 * Check for Integer speculation instruction
+			 * - Bit 33-35 to be equal to 0x1
+			 */
+			if (((kprobe_inst >> 33) & 0x7) == 1) {
+				printk(KERN_WARNING
+					"Kprobes on speculation inst at <0x%lx> not supported\n",
+						addr);
+				return -EINVAL;
+			}
+			/*
+			 * IP relative mov instruction
+			 *  - Bit 27-35 to be equal to 0x30
+			 */
+			if (((kprobe_inst >> 27) & 0x1FF) == 0x30) {
+				printk(KERN_WARNING
+					"Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n",
+						addr);
+				return -EINVAL;
+
+			}
+		}
+		else if ((major_opcode == 5) &&	!(kprobe_inst & (0xFUl << 33)) &&
+				(kprobe_inst & (0x1UL << 12))) {
+			/* test bit instructions, tbit,tnat,tf
+			 * bit 33-36 to be equal to 0
+			 * bit 12 to be equal to 1
+			 */
+			if (slot == 1 && qp) {
+				printk(KERN_WARNING "Kprobes on test bit "
+						"instruction on slot at <0x%lx> "
+						"is not supported\n", addr);
+				return -EINVAL;
+			}
+			qp = 0;
+		}
+	}
+	else if (bundle_encoding[template][slot] == B) {
+		if (major_opcode == 7) {
+			/* IP-Relative Predict major code is 7 */
+			printk(KERN_WARNING "Kprobes on IP-Relative"
+					"Predict is not supported\n");
+			return -EINVAL;
+		}
+		else if (major_opcode == 2) {
+			/* Indirect Predict, major code is 2
+			 * bit 27-32 to be equal to 10 or 11
+			 */
+			int x6=(kprobe_inst >> 27) & 0x3F;
+			if ((x6 == 0x10) || (x6 == 0x11)) {
+				printk(KERN_WARNING "Kprobes on "
+					"Indirect Predict is not supported\n");
+				return -EINVAL;
+			}
+		}
+	}
+	/* kernel does not use float instruction, here for safety kprobe
+	 * will judge whether it is fcmp/flass/float approximation instruction
+	 */
+	else if (unlikely(bundle_encoding[template][slot] == F)) {
+		if ((major_opcode == 4 || major_opcode == 5) &&
+				(kprobe_inst  & (0x1 << 12))) {
+			/* fcmp/fclass unc instruction */
+			if (slot == 1 && qp) {
+				printk(KERN_WARNING "Kprobes on fcmp/fclass "
+					"instruction on slot at <0x%lx> "
+					"is not supported\n", addr);
+				return -EINVAL;
+
+			}
+			qp = 0;
+		}
+		if ((major_opcode == 0 || major_opcode == 1) &&
+			(kprobe_inst & (0x1UL << 33))) {
+			/* float Approximation instruction */
+			if (slot == 1 && qp) {
+				printk(KERN_WARNING "Kprobes on float Approx "
+					"instr at <0x%lx> is not supported\n",
+						addr);
+				return -EINVAL;
+			}
+			qp = 0;
+		}
+	}
+	return qp;
+}
+
+/*
+ * In this function we override the bundle with
+ * the break instruction at the given slot.
+ */
+static void __kprobes prepare_break_inst(uint template, uint  slot,
+					 uint major_opcode,
+					 unsigned long kprobe_inst,
+					 struct kprobe *p,
+					 int qp)
+{
+	unsigned long break_inst = BREAK_INST;
+	bundle_t *bundle = &p->opcode.bundle;
+
+	/*
+	 * Copy the original kprobe_inst qualifying predicate(qp)
+	 * to the break instruction
+	 */
+	break_inst |= qp;
+
+	switch (slot) {
+	  case 0:
+		bundle->quad0.slot0 = break_inst;
+		break;
+	  case 1:
+		bundle->quad0.slot1_p0 = break_inst;
+		bundle->quad1.slot1_p1 = break_inst >> (64-46);
+		break;
+	  case 2:
+		bundle->quad1.slot2 = break_inst;
+		break;
+	}
+
+	/*
+	 * Update the instruction flag, so that we can
+	 * emulate the instruction properly after we
+	 * single step on original instruction
+	 */
+	update_kprobe_inst_flag(template, slot, major_opcode, kprobe_inst, p);
+}
+
+static void __kprobes get_kprobe_inst(bundle_t *bundle, uint slot,
+	       	unsigned long *kprobe_inst, uint *major_opcode)
+{
+	unsigned long kprobe_inst_p0, kprobe_inst_p1;
+	unsigned int template;
+
+	template = bundle->quad0.template;
+
+	switch (slot) {
+	  case 0:
+		*major_opcode = (bundle->quad0.slot0 >> SLOT0_OPCODE_SHIFT);
+		*kprobe_inst = bundle->quad0.slot0;
+		  break;
+	  case 1:
+		*major_opcode = (bundle->quad1.slot1_p1 >> SLOT1_p1_OPCODE_SHIFT);
+		kprobe_inst_p0 = bundle->quad0.slot1_p0;
+		kprobe_inst_p1 = bundle->quad1.slot1_p1;
+		*kprobe_inst = kprobe_inst_p0 | (kprobe_inst_p1 << (64-46));
+		break;
+	  case 2:
+		*major_opcode = (bundle->quad1.slot2 >> SLOT2_OPCODE_SHIFT);
+		*kprobe_inst = bundle->quad1.slot2;
+		break;
+	}
+}
+
+/* Returns non-zero if the addr is in the Interrupt Vector Table */
+static int __kprobes in_ivt_functions(unsigned long addr)
+{
+	return (addr >= (unsigned long)__start_ivt_text
+		&& addr < (unsigned long)__end_ivt_text);
+}
+
+static int __kprobes valid_kprobe_addr(int template, int slot,
+				       unsigned long addr)
+{
+	if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) {
+		printk(KERN_WARNING "Attempting to insert unaligned kprobe "
+				"at 0x%lx\n", addr);
+		return -EINVAL;
+	}
+
+	if (in_ivt_functions(addr)) {
+		printk(KERN_WARNING "Kprobes can't be inserted inside "
+				"IVT functions at 0x%lx\n", addr);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+	unsigned int i;
+	i = atomic_add_return(1, &kcb->prev_kprobe_index);
+	kcb->prev_kprobe[i-1].kp = kprobe_running();
+	kcb->prev_kprobe[i-1].status = kcb->kprobe_status;
+}
+
+static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+	unsigned int i;
+	i = atomic_read(&kcb->prev_kprobe_index);
+	__this_cpu_write(current_kprobe, kcb->prev_kprobe[i-1].kp);
+	kcb->kprobe_status = kcb->prev_kprobe[i-1].status;
+	atomic_sub(1, &kcb->prev_kprobe_index);
+}
+
+static void __kprobes set_current_kprobe(struct kprobe *p,
+			struct kprobe_ctlblk *kcb)
+{
+	__this_cpu_write(current_kprobe, p);
+}
+
+void __kretprobe_trampoline(void)
+{
+}
+
+int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
+{
+	regs->cr_iip = __kretprobe_trampoline_handler(regs, NULL);
+	/*
+	 * By returning a non-zero value, we are telling
+	 * kprobe_handler() that we don't want the post_handler
+	 * to run (and have re-enabled preemption)
+	 */
+	return 1;
+}
+
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
+				      struct pt_regs *regs)
+{
+	ri->ret_addr = (kprobe_opcode_t *)regs->b0;
+	ri->fp = NULL;
+
+	/* Replace the return addr with trampoline addr */
+	regs->b0 = (unsigned long)dereference_function_descriptor(__kretprobe_trampoline);
+}
+
+/* Check the instruction in the slot is break */
+static int __kprobes __is_ia64_break_inst(bundle_t *bundle, uint slot)
+{
+	unsigned int major_opcode;
+	unsigned int template = bundle->quad0.template;
+	unsigned long kprobe_inst;
+
+	/* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */
+	if (slot == 1 && bundle_encoding[template][1] == L)
+		slot++;
+
+	/* Get Kprobe probe instruction at given slot*/
+	get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode);
+
+	/* For break instruction,
+	 * Bits 37:40 Major opcode to be zero
+	 * Bits 27:32 X6 to be zero
+	 * Bits 32:35 X3 to be zero
+	 */
+	if (major_opcode || ((kprobe_inst >> 27) & 0x1FF)) {
+		/* Not a break instruction */
+		return 0;
+	}
+
+	/* Is a break instruction */
+	return 1;
+}
+
+/*
+ * In this function, we check whether the target bundle modifies IP or
+ * it triggers an exception. If so, it cannot be boostable.
+ */
+static int __kprobes can_boost(bundle_t *bundle, uint slot,
+			       unsigned long bundle_addr)
+{
+	unsigned int template = bundle->quad0.template;
+
+	do {
+		if (search_exception_tables(bundle_addr + slot) ||
+		    __is_ia64_break_inst(bundle, slot))
+			return 0;	/* exception may occur in this bundle*/
+	} while ((++slot) < 3);
+	template &= 0x1e;
+	if (template >= 0x10 /* including B unit */ ||
+	    template == 0x04 /* including X unit */ ||
+	    template == 0x06) /* undefined */
+		return 0;
+
+	return 1;
+}
+
+/* Prepare long jump bundle and disables other boosters if need */
+static void __kprobes prepare_booster(struct kprobe *p)
+{
+	unsigned long addr = (unsigned long)p->addr & ~0xFULL;
+	unsigned int slot = (unsigned long)p->addr & 0xf;
+	struct kprobe *other_kp;
+
+	if (can_boost(&p->ainsn.insn[0].bundle, slot, addr)) {
+		set_brl_inst(&p->ainsn.insn[1].bundle, (bundle_t *)addr + 1);
+		p->ainsn.inst_flag |= INST_FLAG_BOOSTABLE;
+	}
+
+	/* disables boosters in previous slots */
+	for (; addr < (unsigned long)p->addr; addr++) {
+		other_kp = get_kprobe((void *)addr);
+		if (other_kp)
+			other_kp->ainsn.inst_flag &= ~INST_FLAG_BOOSTABLE;
+	}
+}
+
+int __kprobes arch_prepare_kprobe(struct kprobe *p)
+{
+	unsigned long addr = (unsigned long) p->addr;
+	unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL);
+	unsigned long kprobe_inst=0;
+	unsigned int slot = addr & 0xf, template, major_opcode = 0;
+	bundle_t *bundle;
+	int qp;
+
+	bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle;
+	template = bundle->quad0.template;
+
+	if(valid_kprobe_addr(template, slot, addr))
+		return -EINVAL;
+
+	/* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */
+	if (slot == 1 && bundle_encoding[template][1] == L)
+		slot++;
+
+	/* Get kprobe_inst and major_opcode from the bundle */
+	get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode);
+
+	qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr);
+	if (qp < 0)
+		return -EINVAL;
+
+	p->ainsn.insn = get_insn_slot();
+	if (!p->ainsn.insn)
+		return -ENOMEM;
+	memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t));
+	memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t));
+
+	prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp);
+
+	prepare_booster(p);
+
+	return 0;
+}
+
+void __kprobes arch_arm_kprobe(struct kprobe *p)
+{
+	unsigned long arm_addr;
+	bundle_t *src, *dest;
+
+	arm_addr = ((unsigned long)p->addr) & ~0xFUL;
+	dest = &((kprobe_opcode_t *)arm_addr)->bundle;
+	src = &p->opcode.bundle;
+
+	flush_icache_range((unsigned long)p->ainsn.insn,
+			   (unsigned long)p->ainsn.insn +
+			   sizeof(kprobe_opcode_t) * MAX_INSN_SIZE);
+
+	switch (p->ainsn.slot) {
+		case 0:
+			dest->quad0.slot0 = src->quad0.slot0;
+			break;
+		case 1:
+			dest->quad1.slot1_p1 = src->quad1.slot1_p1;
+			break;
+		case 2:
+			dest->quad1.slot2 = src->quad1.slot2;
+			break;
+	}
+	flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
+}
+
+void __kprobes arch_disarm_kprobe(struct kprobe *p)
+{
+	unsigned long arm_addr;
+	bundle_t *src, *dest;
+
+	arm_addr = ((unsigned long)p->addr) & ~0xFUL;
+	dest = &((kprobe_opcode_t *)arm_addr)->bundle;
+	/* p->ainsn.insn contains the original unaltered kprobe_opcode_t */
+	src = &p->ainsn.insn->bundle;
+	switch (p->ainsn.slot) {
+		case 0:
+			dest->quad0.slot0 = src->quad0.slot0;
+			break;
+		case 1:
+			dest->quad1.slot1_p1 = src->quad1.slot1_p1;
+			break;
+		case 2:
+			dest->quad1.slot2 = src->quad1.slot2;
+			break;
+	}
+	flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
+}
+
+void __kprobes arch_remove_kprobe(struct kprobe *p)
+{
+	if (p->ainsn.insn) {
+		free_insn_slot(p->ainsn.insn,
+			       p->ainsn.inst_flag & INST_FLAG_BOOSTABLE);
+		p->ainsn.insn = NULL;
+	}
+}
+/*
+ * We are resuming execution after a single step fault, so the pt_regs
+ * structure reflects the register state after we executed the instruction
+ * located in the kprobe (p->ainsn.insn->bundle).  We still need to adjust
+ * the ip to point back to the original stack address. To set the IP address
+ * to original stack address, handle the case where we need to fixup the
+ * relative IP address and/or fixup branch register.
+ */
+static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
+{
+	unsigned long bundle_addr = (unsigned long) (&p->ainsn.insn->bundle);
+	unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL;
+	unsigned long template;
+	int slot = ((unsigned long)p->addr & 0xf);
+
+	template = p->ainsn.insn->bundle.quad0.template;
+
+	if (slot == 1 && bundle_encoding[template][1] == L)
+		slot = 2;
+
+	if (p->ainsn.inst_flag & ~INST_FLAG_BOOSTABLE) {
+
+		if (p->ainsn.inst_flag & INST_FLAG_FIX_RELATIVE_IP_ADDR) {
+			/* Fix relative IP address */
+			regs->cr_iip = (regs->cr_iip - bundle_addr) +
+					resume_addr;
+		}
+
+		if (p->ainsn.inst_flag & INST_FLAG_FIX_BRANCH_REG) {
+		/*
+		 * Fix target branch register, software convention is
+		 * to use either b0 or b6 or b7, so just checking
+		 * only those registers
+		 */
+			switch (p->ainsn.target_br_reg) {
+			case 0:
+				if ((regs->b0 == bundle_addr) ||
+					(regs->b0 == bundle_addr + 0x10)) {
+					regs->b0 = (regs->b0 - bundle_addr) +
+						resume_addr;
+				}
+				break;
+			case 6:
+				if ((regs->b6 == bundle_addr) ||
+					(regs->b6 == bundle_addr + 0x10)) {
+					regs->b6 = (regs->b6 - bundle_addr) +
+						resume_addr;
+				}
+				break;
+			case 7:
+				if ((regs->b7 == bundle_addr) ||
+					(regs->b7 == bundle_addr + 0x10)) {
+					regs->b7 = (regs->b7 - bundle_addr) +
+						resume_addr;
+				}
+				break;
+			} /* end switch */
+		}
+		goto turn_ss_off;
+	}
+
+	if (slot == 2) {
+		if (regs->cr_iip == bundle_addr + 0x10) {
+			regs->cr_iip = resume_addr + 0x10;
+		}
+	} else {
+		if (regs->cr_iip == bundle_addr) {
+			regs->cr_iip = resume_addr;
+		}
+	}
+
+turn_ss_off:
+	/* Turn off Single Step bit */
+	ia64_psr(regs)->ss = 0;
+}
+
+static void __kprobes prepare_ss(struct kprobe *p, struct pt_regs *regs)
+{
+	unsigned long bundle_addr = (unsigned long) &p->ainsn.insn->bundle;
+	unsigned long slot = (unsigned long)p->addr & 0xf;
+
+	/* single step inline if break instruction */
+	if (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)
+		regs->cr_iip = (unsigned long)p->addr & ~0xFULL;
+	else
+		regs->cr_iip = bundle_addr & ~0xFULL;
+
+	if (slot > 2)
+		slot = 0;
+
+	ia64_psr(regs)->ri = slot;
+
+	/* turn on single stepping */
+	ia64_psr(regs)->ss = 1;
+}
+
+static int __kprobes is_ia64_break_inst(struct pt_regs *regs)
+{
+	unsigned int slot = ia64_psr(regs)->ri;
+	unsigned long *kprobe_addr = (unsigned long *)regs->cr_iip;
+	bundle_t bundle;
+
+	memcpy(&bundle, kprobe_addr, sizeof(bundle_t));
+
+	return __is_ia64_break_inst(&bundle, slot);
+}
+
+static int __kprobes pre_kprobes_handler(struct die_args *args)
+{
+	struct kprobe *p;
+	int ret = 0;
+	struct pt_regs *regs = args->regs;
+	kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs);
+	struct kprobe_ctlblk *kcb;
+
+	/*
+	 * We don't want to be preempted for the entire
+	 * duration of kprobe processing
+	 */
+	preempt_disable();
+	kcb = get_kprobe_ctlblk();
+
+	/* Handle recursion cases */
+	if (kprobe_running()) {
+		p = get_kprobe(addr);
+		if (p) {
+			if ((kcb->kprobe_status == KPROBE_HIT_SS) &&
+	 		     (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)) {
+				ia64_psr(regs)->ss = 0;
+				goto no_kprobe;
+			}
+			/* We have reentered the pre_kprobe_handler(), since
+			 * another probe was hit while within the handler.
+			 * We here save the original kprobes variables and
+			 * just single step on the instruction of the new probe
+			 * without calling any user handlers.
+			 */
+			save_previous_kprobe(kcb);
+			set_current_kprobe(p, kcb);
+			kprobes_inc_nmissed_count(p);
+			prepare_ss(p, regs);
+			kcb->kprobe_status = KPROBE_REENTER;
+			return 1;
+		} else if (!is_ia64_break_inst(regs)) {
+			/* The breakpoint instruction was removed by
+			 * another cpu right after we hit, no further
+			 * handling of this interrupt is appropriate
+			 */
+			ret = 1;
+			goto no_kprobe;
+		} else {
+			/* Not our break */
+			goto no_kprobe;
+		}
+	}
+
+	p = get_kprobe(addr);
+	if (!p) {
+		if (!is_ia64_break_inst(regs)) {
+			/*
+			 * The breakpoint instruction was removed right
+			 * after we hit it.  Another cpu has removed
+			 * either a probepoint or a debugger breakpoint
+			 * at this address.  In either case, no further
+			 * handling of this interrupt is appropriate.
+			 */
+			ret = 1;
+
+		}
+
+		/* Not one of our break, let kernel handle it */
+		goto no_kprobe;
+	}
+
+	set_current_kprobe(p, kcb);
+	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+
+	if (p->pre_handler && p->pre_handler(p, regs)) {
+		reset_current_kprobe();
+		preempt_enable_no_resched();
+		return 1;
+	}
+
+#if !defined(CONFIG_PREEMPTION)
+	if (p->ainsn.inst_flag == INST_FLAG_BOOSTABLE && !p->post_handler) {
+		/* Boost up -- we can execute copied instructions directly */
+		ia64_psr(regs)->ri = p->ainsn.slot;
+		regs->cr_iip = (unsigned long)&p->ainsn.insn->bundle & ~0xFULL;
+		/* turn single stepping off */
+		ia64_psr(regs)->ss = 0;
+
+		reset_current_kprobe();
+		preempt_enable_no_resched();
+		return 1;
+	}
+#endif
+	prepare_ss(p, regs);
+	kcb->kprobe_status = KPROBE_HIT_SS;
+	return 1;
+
+no_kprobe:
+	preempt_enable_no_resched();
+	return ret;
+}
+
+static int __kprobes post_kprobes_handler(struct pt_regs *regs)
+{
+	struct kprobe *cur = kprobe_running();
+	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+	if (!cur)
+		return 0;
+
+	if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
+		kcb->kprobe_status = KPROBE_HIT_SSDONE;
+		cur->post_handler(cur, regs, 0);
+	}
+
+	resume_execution(cur, regs);
+
+	/*Restore back the original saved kprobes variables and continue. */
+	if (kcb->kprobe_status == KPROBE_REENTER) {
+		restore_previous_kprobe(kcb);
+		goto out;
+	}
+	reset_current_kprobe();
+
+out:
+	preempt_enable_no_resched();
+	return 1;
+}
+
+int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
+{
+	struct kprobe *cur = kprobe_running();
+	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+
+	switch(kcb->kprobe_status) {
+	case KPROBE_HIT_SS:
+	case KPROBE_REENTER:
+		/*
+		 * We are here because the instruction being single
+		 * stepped caused a page fault. We reset the current
+		 * kprobe and the instruction pointer points back to
+		 * the probe address and allow the page fault handler
+		 * to continue as a normal page fault.
+		 */
+		regs->cr_iip = ((unsigned long)cur->addr) & ~0xFULL;
+		ia64_psr(regs)->ri = ((unsigned long)cur->addr) & 0xf;
+		if (kcb->kprobe_status == KPROBE_REENTER)
+			restore_previous_kprobe(kcb);
+		else
+			reset_current_kprobe();
+		preempt_enable_no_resched();
+		break;
+	case KPROBE_HIT_ACTIVE:
+	case KPROBE_HIT_SSDONE:
+		/*
+		 * In case the user-specified fault handler returned
+		 * zero, try to fix up.
+		 */
+		if (ia64_done_with_exception(regs))
+			return 1;
+
+		/*
+		 * Let ia64_do_page_fault() fix it.
+		 */
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
+				       unsigned long val, void *data)
+{
+	struct die_args *args = (struct die_args *)data;
+	int ret = NOTIFY_DONE;
+
+	if (args->regs && user_mode(args->regs))
+		return ret;
+
+	switch(val) {
+	case DIE_BREAK:
+		/* err is break number from ia64_bad_break() */
+		if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12)
+			|| args->err == 0)
+			if (pre_kprobes_handler(args))
+				ret = NOTIFY_STOP;
+		break;
+	case DIE_FAULT:
+		/* err is vector number from ia64_fault() */
+		if (args->err == 36)
+			if (post_kprobes_handler(args->regs))
+				ret = NOTIFY_STOP;
+		break;
+	default:
+		break;
+	}
+	return ret;
+}
+
+static struct kprobe trampoline_p = {
+	.pre_handler = trampoline_probe_handler
+};
+
+int __init arch_init_kprobes(void)
+{
+	trampoline_p.addr =
+		dereference_function_descriptor(__kretprobe_trampoline);
+	return register_kprobe(&trampoline_p);
+}
+
+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
+{
+	if (p->addr ==
+		dereference_function_descriptor(__kretprobe_trampoline))
+		return 1;
+
+	return 0;
+}
diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c
new file mode 100644
index 000000000..4db9ca144
--- /dev/null
+++ b/arch/ia64/kernel/machine_kexec.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/ia64/kernel/machine_kexec.c
+ *
+ * Handle transition of Linux booting another kernel
+ * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
+ * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com>
+ * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com>
+ */
+
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/cpu.h>
+#include <linux/irq.h>
+#include <linux/efi.h>
+#include <linux/numa.h>
+#include <linux/mmzone.h>
+
+#include <asm/efi.h>
+#include <asm/numa.h>
+#include <asm/mmu_context.h>
+#include <asm/setup.h>
+#include <asm/delay.h>
+#include <asm/meminit.h>
+#include <asm/processor.h>
+#include <asm/sal.h>
+#include <asm/mca.h>
+
+typedef void (*relocate_new_kernel_t)(
+					unsigned long indirection_page,
+					unsigned long start_address,
+					struct ia64_boot_param *boot_param,
+					unsigned long pal_addr) __noreturn;
+
+struct kimage *ia64_kimage;
+
+struct resource efi_memmap_res = {
+        .name  = "EFI Memory Map",
+        .start = 0,
+        .end   = 0,
+        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+struct resource boot_param_res = {
+        .name  = "Boot parameter",
+        .start = 0,
+        .end   = 0,
+        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+
+/*
+ * Do what every setup is needed on image and the
+ * reboot code buffer to allow us to avoid allocations
+ * later.
+ */
+int machine_kexec_prepare(struct kimage *image)
+{
+	void *control_code_buffer;
+	const unsigned long *func;
+
+	func = (unsigned long *)&relocate_new_kernel;
+	/* Pre-load control code buffer to minimize work in kexec path */
+	control_code_buffer = page_address(image->control_code_page);
+	memcpy((void *)control_code_buffer, (const void *)func[0],
+			relocate_new_kernel_size);
+	flush_icache_range((unsigned long)control_code_buffer,
+			(unsigned long)control_code_buffer + relocate_new_kernel_size);
+	ia64_kimage = image;
+
+	return 0;
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+/*
+ * Do not allocate memory (or fail in any way) in machine_kexec().
+ * We are past the point of no return, committed to rebooting now.
+ */
+static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
+{
+	struct kimage *image = arg;
+	relocate_new_kernel_t rnk;
+	void *pal_addr = efi_get_pal_addr();
+	unsigned long code_addr;
+	int ii;
+	u64 fp, gp;
+	ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
+
+	BUG_ON(!image);
+	code_addr = (unsigned long)page_address(image->control_code_page);
+	if (image->type == KEXEC_TYPE_CRASH) {
+		crash_save_this_cpu();
+		current->thread.ksp = (__u64)info->sw - 16;
+
+		/* Register noop init handler */
+		fp = ia64_tpa(init_handler->fp);
+		gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
+		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
+	} else {
+		/* Unregister init handlers of current kernel */
+		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
+	}
+
+	/* Unregister mca handler - No more recovery on current kernel */
+	ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
+
+	/* Interrupts aren't acceptable while we reboot */
+	local_irq_disable();
+
+	/* Mask CMC and Performance Monitor interrupts */
+	ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
+	ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
+
+	/* Mask ITV and Local Redirect Registers */
+	ia64_set_itv(1 << 16);
+	ia64_set_lrr0(1 << 16);
+	ia64_set_lrr1(1 << 16);
+
+	/* terminate possible nested in-service interrupts */
+	for (ii = 0; ii < 16; ii++)
+		ia64_eoi();
+
+	/* unmask TPR and clear any pending interrupts */
+	ia64_setreg(_IA64_REG_CR_TPR, 0);
+	ia64_srlz_d();
+	while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
+		ia64_eoi();
+	rnk = (relocate_new_kernel_t)&code_addr;
+	(*rnk)(image->head, image->start, ia64_boot_param,
+		     GRANULEROUNDDOWN((unsigned long) pal_addr));
+	BUG();
+}
+
+void machine_kexec(struct kimage *image)
+{
+	BUG_ON(!image);
+	unw_init_running(ia64_machine_kexec, image);
+	for(;;);
+}
+
+void arch_crash_save_vmcoreinfo(void)
+{
+#if defined(CONFIG_SPARSEMEM)
+	VMCOREINFO_SYMBOL(pgdat_list);
+	VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
+#endif
+#ifdef CONFIG_NUMA
+	VMCOREINFO_SYMBOL(node_memblk);
+	VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
+	VMCOREINFO_STRUCT_SIZE(node_memblk_s);
+	VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
+	VMCOREINFO_OFFSET(node_memblk_s, size);
+#endif
+#if CONFIG_PGTABLE_LEVELS == 3
+	VMCOREINFO_CONFIG(PGTABLE_3);
+#elif CONFIG_PGTABLE_LEVELS == 4
+	VMCOREINFO_CONFIG(PGTABLE_4);
+#endif
+}
+
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
new file mode 100644
index 000000000..92ede80d1
--- /dev/null
+++ b/arch/ia64/kernel/mca.c
@@ -0,0 +1,2111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * File:	mca.c
+ * Purpose:	Generic MCA handling layer
+ *
+ * Copyright (C) 2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Copyright (C) 2002 Dell Inc.
+ * Copyright (C) Matt Domsch <Matt_Domsch@dell.com>
+ *
+ * Copyright (C) 2002 Intel
+ * Copyright (C) Jenna Hall <jenna.s.hall@intel.com>
+ *
+ * Copyright (C) 2001 Intel
+ * Copyright (C) Fred Lewis <frederick.v.lewis@intel.com>
+ *
+ * Copyright (C) 2000 Intel
+ * Copyright (C) Chuck Fleckenstein <cfleck@co.intel.com>
+ *
+ * Copyright (C) 1999, 2004-2008 Silicon Graphics, Inc.
+ * Copyright (C) Vijay Chander <vijay@engr.sgi.com>
+ *
+ * Copyright (C) 2006 FUJITSU LIMITED
+ * Copyright (C) Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
+ *
+ * 2000-03-29 Chuck Fleckenstein <cfleck@co.intel.com>
+ *	      Fixed PAL/SAL update issues, began MCA bug fixes, logging issues,
+ *	      added min save state dump, added INIT handler.
+ *
+ * 2001-01-03 Fred Lewis <frederick.v.lewis@intel.com>
+ *	      Added setup of CMCI and CPEI IRQs, logging of corrected platform
+ *	      errors, completed code for logging of corrected & uncorrected
+ *	      machine check errors, and updated for conformance with Nov. 2000
+ *	      revision of the SAL 3.0 spec.
+ *
+ * 2002-01-04 Jenna Hall <jenna.s.hall@intel.com>
+ *	      Aligned MCA stack to 16 bytes, added platform vs. CPU error flag,
+ *	      set SAL default return values, changed error record structure to
+ *	      linked list, added init call to sal_get_state_info_size().
+ *
+ * 2002-03-25 Matt Domsch <Matt_Domsch@dell.com>
+ *	      GUID cleanups.
+ *
+ * 2003-04-15 David Mosberger-Tang <davidm@hpl.hp.com>
+ *	      Added INIT backtrace support.
+ *
+ * 2003-12-08 Keith Owens <kaos@sgi.com>
+ *	      smp_call_function() must not be called from interrupt context
+ *	      (can deadlock on tasklist_lock).
+ *	      Use keventd to call smp_call_function().
+ *
+ * 2004-02-01 Keith Owens <kaos@sgi.com>
+ *	      Avoid deadlock when using printk() for MCA and INIT records.
+ *	      Delete all record printing code, moved to salinfo_decode in user
+ *	      space.  Mark variables and functions static where possible.
+ *	      Delete dead variables and functions.  Reorder to remove the need
+ *	      for forward declarations and to consolidate related code.
+ *
+ * 2005-08-12 Keith Owens <kaos@sgi.com>
+ *	      Convert MCA/INIT handlers to use per event stacks and SAL/OS
+ *	      state.
+ *
+ * 2005-10-07 Keith Owens <kaos@sgi.com>
+ *	      Add notify_die() hooks.
+ *
+ * 2006-09-15 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
+ *	      Add printing support for MCA/INIT.
+ *
+ * 2007-04-27 Russ Anderson <rja@sgi.com>
+ *	      Support multiple cpus going through OS_MCA in the same event.
+ */
+#include <linux/jiffies.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/memblock.h>
+#include <linux/acpi.h>
+#include <linux/timer.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/workqueue.h>
+#include <linux/cpumask.h>
+#include <linux/kdebug.h>
+#include <linux/cpu.h>
+#include <linux/gfp.h>
+
+#include <asm/delay.h>
+#include <asm/efi.h>
+#include <asm/meminit.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/sal.h>
+#include <asm/mca.h>
+#include <asm/mca_asm.h>
+#include <asm/kexec.h>
+
+#include <asm/irq.h>
+#include <asm/hw_irq.h>
+#include <asm/tlb.h>
+
+#include "mca_drv.h"
+#include "entry.h"
+#include "irq.h"
+
+#if defined(IA64_MCA_DEBUG_INFO)
+# define IA64_MCA_DEBUG(fmt...) printk(fmt)
+#else
+# define IA64_MCA_DEBUG(fmt...) do {} while (0)
+#endif
+
+#define NOTIFY_INIT(event, regs, arg, spin)				\
+do {									\
+	if ((notify_die((event), "INIT", (regs), (arg), 0, 0)		\
+			== NOTIFY_STOP) && ((spin) == 1))		\
+		ia64_mca_spin(__func__);				\
+} while (0)
+
+#define NOTIFY_MCA(event, regs, arg, spin)				\
+do {									\
+	if ((notify_die((event), "MCA", (regs), (arg), 0, 0)		\
+			== NOTIFY_STOP) && ((spin) == 1))		\
+		ia64_mca_spin(__func__);				\
+} while (0)
+
+/* Used by mca_asm.S */
+DEFINE_PER_CPU(u64, ia64_mca_data); /* == __per_cpu_mca[smp_processor_id()] */
+DEFINE_PER_CPU(u64, ia64_mca_per_cpu_pte); /* PTE to map per-CPU area */
+DEFINE_PER_CPU(u64, ia64_mca_pal_pte);	    /* PTE to map PAL code */
+DEFINE_PER_CPU(u64, ia64_mca_pal_base);    /* vaddr PAL code granule */
+DEFINE_PER_CPU(u64, ia64_mca_tr_reload);   /* Flag for TR reload */
+
+unsigned long __per_cpu_mca[NR_CPUS];
+
+/* In mca_asm.S */
+extern void			ia64_os_init_dispatch_monarch (void);
+extern void			ia64_os_init_dispatch_slave (void);
+
+static int monarch_cpu = -1;
+
+static ia64_mc_info_t		ia64_mc_info;
+
+#define MAX_CPE_POLL_INTERVAL (15*60*HZ) /* 15 minutes */
+#define MIN_CPE_POLL_INTERVAL (2*60*HZ)  /* 2 minutes */
+#define CMC_POLL_INTERVAL     (1*60*HZ)  /* 1 minute */
+#define CPE_HISTORY_LENGTH    5
+#define CMC_HISTORY_LENGTH    5
+
+static struct timer_list cpe_poll_timer;
+static struct timer_list cmc_poll_timer;
+/*
+ * This variable tells whether we are currently in polling mode.
+ * Start with this in the wrong state so we won't play w/ timers
+ * before the system is ready.
+ */
+static int cmc_polling_enabled = 1;
+
+/*
+ * Clearing this variable prevents CPE polling from getting activated
+ * in mca_late_init.  Use it if your system doesn't provide a CPEI,
+ * but encounters problems retrieving CPE logs.  This should only be
+ * necessary for debugging.
+ */
+static int cpe_poll_enabled = 1;
+
+extern void salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe);
+
+static int mca_init __initdata;
+
+/*
+ * limited & delayed printing support for MCA/INIT handler
+ */
+
+#define mprintk(fmt...) ia64_mca_printk(fmt)
+
+#define MLOGBUF_SIZE (512+256*NR_CPUS)
+#define MLOGBUF_MSGMAX 256
+static char mlogbuf[MLOGBUF_SIZE];
+static DEFINE_SPINLOCK(mlogbuf_wlock);	/* mca context only */
+static DEFINE_SPINLOCK(mlogbuf_rlock);	/* normal context only */
+static unsigned long mlogbuf_start;
+static unsigned long mlogbuf_end;
+static unsigned int mlogbuf_finished = 0;
+static unsigned long mlogbuf_timestamp = 0;
+
+static int loglevel_save = -1;
+#define BREAK_LOGLEVEL(__console_loglevel)		\
+	oops_in_progress = 1;				\
+	if (loglevel_save < 0)				\
+		loglevel_save = __console_loglevel;	\
+	__console_loglevel = 15;
+
+#define RESTORE_LOGLEVEL(__console_loglevel)		\
+	if (loglevel_save >= 0) {			\
+		__console_loglevel = loglevel_save;	\
+		loglevel_save = -1;			\
+	}						\
+	mlogbuf_finished = 0;				\
+	oops_in_progress = 0;
+
+/*
+ * Push messages into buffer, print them later if not urgent.
+ */
+void ia64_mca_printk(const char *fmt, ...)
+{
+	va_list args;
+	int printed_len;
+	char temp_buf[MLOGBUF_MSGMAX];
+	char *p;
+
+	va_start(args, fmt);
+	printed_len = vscnprintf(temp_buf, sizeof(temp_buf), fmt, args);
+	va_end(args);
+
+	/* Copy the output into mlogbuf */
+	if (oops_in_progress) {
+		/* mlogbuf was abandoned, use printk directly instead. */
+		printk("%s", temp_buf);
+	} else {
+		spin_lock(&mlogbuf_wlock);
+		for (p = temp_buf; *p; p++) {
+			unsigned long next = (mlogbuf_end + 1) % MLOGBUF_SIZE;
+			if (next != mlogbuf_start) {
+				mlogbuf[mlogbuf_end] = *p;
+				mlogbuf_end = next;
+			} else {
+				/* buffer full */
+				break;
+			}
+		}
+		mlogbuf[mlogbuf_end] = '\0';
+		spin_unlock(&mlogbuf_wlock);
+	}
+}
+EXPORT_SYMBOL(ia64_mca_printk);
+
+/*
+ * Print buffered messages.
+ *  NOTE: call this after returning normal context. (ex. from salinfod)
+ */
+void ia64_mlogbuf_dump(void)
+{
+	char temp_buf[MLOGBUF_MSGMAX];
+	char *p;
+	unsigned long index;
+	unsigned long flags;
+	unsigned int printed_len;
+
+	/* Get output from mlogbuf */
+	while (mlogbuf_start != mlogbuf_end) {
+		temp_buf[0] = '\0';
+		p = temp_buf;
+		printed_len = 0;
+
+		spin_lock_irqsave(&mlogbuf_rlock, flags);
+
+		index = mlogbuf_start;
+		while (index != mlogbuf_end) {
+			*p = mlogbuf[index];
+			index = (index + 1) % MLOGBUF_SIZE;
+			if (!*p)
+				break;
+			p++;
+			if (++printed_len >= MLOGBUF_MSGMAX - 1)
+				break;
+		}
+		*p = '\0';
+		if (temp_buf[0])
+			printk("%s", temp_buf);
+		mlogbuf_start = index;
+
+		mlogbuf_timestamp = 0;
+		spin_unlock_irqrestore(&mlogbuf_rlock, flags);
+	}
+}
+EXPORT_SYMBOL(ia64_mlogbuf_dump);
+
+/*
+ * Call this if system is going to down or if immediate flushing messages to
+ * console is required. (ex. recovery was failed, crash dump is going to be
+ * invoked, long-wait rendezvous etc.)
+ *  NOTE: this should be called from monarch.
+ */
+static void ia64_mlogbuf_finish(int wait)
+{
+	BREAK_LOGLEVEL(console_loglevel);
+
+	ia64_mlogbuf_dump();
+	printk(KERN_EMERG "mlogbuf_finish: printing switched to urgent mode, "
+		"MCA/INIT might be dodgy or fail.\n");
+
+	if (!wait)
+		return;
+
+	/* wait for console */
+	printk("Delaying for 5 seconds...\n");
+	udelay(5*1000000);
+
+	mlogbuf_finished = 1;
+}
+
+/*
+ * Print buffered messages from INIT context.
+ */
+static void ia64_mlogbuf_dump_from_init(void)
+{
+	if (mlogbuf_finished)
+		return;
+
+	if (mlogbuf_timestamp &&
+			time_before(jiffies, mlogbuf_timestamp + 30 * HZ)) {
+		printk(KERN_ERR "INIT: mlogbuf_dump is interrupted by INIT "
+			" and the system seems to be messed up.\n");
+		ia64_mlogbuf_finish(0);
+		return;
+	}
+
+	if (!spin_trylock(&mlogbuf_rlock)) {
+		printk(KERN_ERR "INIT: mlogbuf_dump is interrupted by INIT. "
+			"Generated messages other than stack dump will be "
+			"buffered to mlogbuf and will be printed later.\n");
+		printk(KERN_ERR "INIT: If messages would not printed after "
+			"this INIT, wait 30sec and assert INIT again.\n");
+		if (!mlogbuf_timestamp)
+			mlogbuf_timestamp = jiffies;
+		return;
+	}
+	spin_unlock(&mlogbuf_rlock);
+	ia64_mlogbuf_dump();
+}
+
+static inline void
+ia64_mca_spin(const char *func)
+{
+	if (monarch_cpu == smp_processor_id())
+		ia64_mlogbuf_finish(0);
+	mprintk(KERN_EMERG "%s: spinning here, not returning to SAL\n", func);
+	while (1)
+		cpu_relax();
+}
+/*
+ * IA64_MCA log support
+ */
+#define IA64_MAX_LOGS		2	/* Double-buffering for nested MCAs */
+#define IA64_MAX_LOG_TYPES      4   /* MCA, INIT, CMC, CPE */
+
+typedef struct ia64_state_log_s
+{
+	spinlock_t	isl_lock;
+	int		isl_index;
+	unsigned long	isl_count;
+	ia64_err_rec_t  *isl_log[IA64_MAX_LOGS]; /* need space to store header + error log */
+} ia64_state_log_t;
+
+static ia64_state_log_t ia64_state_log[IA64_MAX_LOG_TYPES];
+
+#define IA64_LOG_LOCK_INIT(it) spin_lock_init(&ia64_state_log[it].isl_lock)
+#define IA64_LOG_LOCK(it)      spin_lock_irqsave(&ia64_state_log[it].isl_lock, s)
+#define IA64_LOG_UNLOCK(it)    spin_unlock_irqrestore(&ia64_state_log[it].isl_lock,s)
+#define IA64_LOG_NEXT_INDEX(it)    ia64_state_log[it].isl_index
+#define IA64_LOG_CURR_INDEX(it)    1 - ia64_state_log[it].isl_index
+#define IA64_LOG_INDEX_INC(it) \
+    {ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index; \
+    ia64_state_log[it].isl_count++;}
+#define IA64_LOG_INDEX_DEC(it) \
+    ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index
+#define IA64_LOG_NEXT_BUFFER(it)   (void *)((ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)]))
+#define IA64_LOG_CURR_BUFFER(it)   (void *)((ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)]))
+#define IA64_LOG_COUNT(it)         ia64_state_log[it].isl_count
+
+static inline void ia64_log_allocate(int it, u64 size)
+{
+	ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)] =
+		(ia64_err_rec_t *)memblock_alloc(size, SMP_CACHE_BYTES);
+	if (!ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)])
+		panic("%s: Failed to allocate %llu bytes\n", __func__, size);
+
+	ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)] =
+		(ia64_err_rec_t *)memblock_alloc(size, SMP_CACHE_BYTES);
+	if (!ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)])
+		panic("%s: Failed to allocate %llu bytes\n", __func__, size);
+}
+
+/*
+ * ia64_log_init
+ *	Reset the OS ia64 log buffer
+ * Inputs   :   info_type   (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
+ * Outputs	:	None
+ */
+static void __init
+ia64_log_init(int sal_info_type)
+{
+	u64	max_size = 0;
+
+	IA64_LOG_NEXT_INDEX(sal_info_type) = 0;
+	IA64_LOG_LOCK_INIT(sal_info_type);
+
+	// SAL will tell us the maximum size of any error record of this type
+	max_size = ia64_sal_get_state_info_size(sal_info_type);
+	if (!max_size)
+		/* alloc_bootmem() doesn't like zero-sized allocations! */
+		return;
+
+	// set up OS data structures to hold error info
+	ia64_log_allocate(sal_info_type, max_size);
+}
+
+/*
+ * ia64_log_get
+ *
+ *	Get the current MCA log from SAL and copy it into the OS log buffer.
+ *
+ *  Inputs  :   info_type   (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
+ *              irq_safe    whether you can use printk at this point
+ *  Outputs :   size        (total record length)
+ *              *buffer     (ptr to error record)
+ *
+ */
+static u64
+ia64_log_get(int sal_info_type, u8 **buffer, int irq_safe)
+{
+	sal_log_record_header_t     *log_buffer;
+	u64                         total_len = 0;
+	unsigned long               s;
+
+	IA64_LOG_LOCK(sal_info_type);
+
+	/* Get the process state information */
+	log_buffer = IA64_LOG_NEXT_BUFFER(sal_info_type);
+
+	total_len = ia64_sal_get_state_info(sal_info_type, (u64 *)log_buffer);
+
+	if (total_len) {
+		IA64_LOG_INDEX_INC(sal_info_type);
+		IA64_LOG_UNLOCK(sal_info_type);
+		if (irq_safe) {
+			IA64_MCA_DEBUG("%s: SAL error record type %d retrieved. Record length = %ld\n",
+				       __func__, sal_info_type, total_len);
+		}
+		*buffer = (u8 *) log_buffer;
+		return total_len;
+	} else {
+		IA64_LOG_UNLOCK(sal_info_type);
+		return 0;
+	}
+}
+
+/*
+ *  ia64_mca_log_sal_error_record
+ *
+ *  This function retrieves a specified error record type from SAL
+ *  and wakes up any processes waiting for error records.
+ *
+ *  Inputs  :   sal_info_type   (Type of error record MCA/CMC/CPE)
+ *              FIXME: remove MCA and irq_safe.
+ */
+static void
+ia64_mca_log_sal_error_record(int sal_info_type)
+{
+	u8 *buffer;
+	sal_log_record_header_t *rh;
+	u64 size;
+	int irq_safe = sal_info_type != SAL_INFO_TYPE_MCA;
+#ifdef IA64_MCA_DEBUG_INFO
+	static const char * const rec_name[] = { "MCA", "INIT", "CMC", "CPE" };
+#endif
+
+	size = ia64_log_get(sal_info_type, &buffer, irq_safe);
+	if (!size)
+		return;
+
+	salinfo_log_wakeup(sal_info_type, buffer, size, irq_safe);
+
+	if (irq_safe)
+		IA64_MCA_DEBUG("CPU %d: SAL log contains %s error record\n",
+			smp_processor_id(),
+			sal_info_type < ARRAY_SIZE(rec_name) ? rec_name[sal_info_type] : "UNKNOWN");
+
+	/* Clear logs from corrected errors in case there's no user-level logger */
+	rh = (sal_log_record_header_t *)buffer;
+	if (rh->severity == sal_log_severity_corrected)
+		ia64_sal_clear_state_info(sal_info_type);
+}
+
+/*
+ * search_mca_table
+ *  See if the MCA surfaced in an instruction range
+ *  that has been tagged as recoverable.
+ *
+ *  Inputs
+ *	first	First address range to check
+ *	last	Last address range to check
+ *	ip	Instruction pointer, address we are looking for
+ *
+ * Return value:
+ *      1 on Success (in the table)/ 0 on Failure (not in the  table)
+ */
+int
+search_mca_table (const struct mca_table_entry *first,
+                const struct mca_table_entry *last,
+                unsigned long ip)
+{
+        const struct mca_table_entry *curr;
+        u64 curr_start, curr_end;
+
+        curr = first;
+        while (curr <= last) {
+                curr_start = (u64) &curr->start_addr + curr->start_addr;
+                curr_end = (u64) &curr->end_addr + curr->end_addr;
+
+                if ((ip >= curr_start) && (ip <= curr_end)) {
+                        return 1;
+                }
+                curr++;
+        }
+        return 0;
+}
+
+/* Given an address, look for it in the mca tables. */
+int mca_recover_range(unsigned long addr)
+{
+	extern struct mca_table_entry __start___mca_table[];
+	extern struct mca_table_entry __stop___mca_table[];
+
+	return search_mca_table(__start___mca_table, __stop___mca_table-1, addr);
+}
+EXPORT_SYMBOL_GPL(mca_recover_range);
+
+int cpe_vector = -1;
+int ia64_cpe_irq = -1;
+
+static irqreturn_t
+ia64_mca_cpe_int_handler (int cpe_irq, void *arg)
+{
+	static unsigned long	cpe_history[CPE_HISTORY_LENGTH];
+	static int		index;
+	static DEFINE_SPINLOCK(cpe_history_lock);
+
+	IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
+		       __func__, cpe_irq, smp_processor_id());
+
+	/* SAL spec states this should run w/ interrupts enabled */
+	local_irq_enable();
+
+	spin_lock(&cpe_history_lock);
+	if (!cpe_poll_enabled && cpe_vector >= 0) {
+
+		int i, count = 1; /* we know 1 happened now */
+		unsigned long now = jiffies;
+
+		for (i = 0; i < CPE_HISTORY_LENGTH; i++) {
+			if (now - cpe_history[i] <= HZ)
+				count++;
+		}
+
+		IA64_MCA_DEBUG(KERN_INFO "CPE threshold %d/%d\n", count, CPE_HISTORY_LENGTH);
+		if (count >= CPE_HISTORY_LENGTH) {
+
+			cpe_poll_enabled = 1;
+			spin_unlock(&cpe_history_lock);
+			disable_irq_nosync(local_vector_to_irq(IA64_CPE_VECTOR));
+
+			/*
+			 * Corrected errors will still be corrected, but
+			 * make sure there's a log somewhere that indicates
+			 * something is generating more than we can handle.
+			 */
+			printk(KERN_WARNING "WARNING: Switching to polling CPE handler; error records may be lost\n");
+
+			mod_timer(&cpe_poll_timer, jiffies + MIN_CPE_POLL_INTERVAL);
+
+			/* lock already released, get out now */
+			goto out;
+		} else {
+			cpe_history[index++] = now;
+			if (index == CPE_HISTORY_LENGTH)
+				index = 0;
+		}
+	}
+	spin_unlock(&cpe_history_lock);
+out:
+	/* Get the CPE error record and log it */
+	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CPE);
+
+	local_irq_disable();
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * ia64_mca_register_cpev
+ *
+ *  Register the corrected platform error vector with SAL.
+ *
+ *  Inputs
+ *      cpev        Corrected Platform Error Vector number
+ *
+ *  Outputs
+ *      None
+ */
+void
+ia64_mca_register_cpev (int cpev)
+{
+	/* Register the CPE interrupt vector with SAL */
+	struct ia64_sal_retval isrv;
+
+	isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_CPE_INT, SAL_MC_PARAM_MECHANISM_INT, cpev, 0, 0);
+	if (isrv.status) {
+		printk(KERN_ERR "Failed to register Corrected Platform "
+		       "Error interrupt vector with SAL (status %ld)\n", isrv.status);
+		return;
+	}
+
+	IA64_MCA_DEBUG("%s: corrected platform error "
+		       "vector %#x registered\n", __func__, cpev);
+}
+
+/*
+ * ia64_mca_cmc_vector_setup
+ *
+ *  Setup the corrected machine check vector register in the processor.
+ *  (The interrupt is masked on boot. ia64_mca_late_init unmask this.)
+ *  This function is invoked on a per-processor basis.
+ *
+ * Inputs
+ *      None
+ *
+ * Outputs
+ *	None
+ */
+void
+ia64_mca_cmc_vector_setup (void)
+{
+	cmcv_reg_t	cmcv;
+
+	cmcv.cmcv_regval	= 0;
+	cmcv.cmcv_mask		= 1;        /* Mask/disable interrupt at first */
+	cmcv.cmcv_vector	= IA64_CMC_VECTOR;
+	ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
+
+	IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x registered.\n",
+		       __func__, smp_processor_id(), IA64_CMC_VECTOR);
+
+	IA64_MCA_DEBUG("%s: CPU %d CMCV = %#016lx\n",
+		       __func__, smp_processor_id(), ia64_getreg(_IA64_REG_CR_CMCV));
+}
+
+/*
+ * ia64_mca_cmc_vector_disable
+ *
+ *  Mask the corrected machine check vector register in the processor.
+ *  This function is invoked on a per-processor basis.
+ *
+ * Inputs
+ *      dummy(unused)
+ *
+ * Outputs
+ *	None
+ */
+static void
+ia64_mca_cmc_vector_disable (void *dummy)
+{
+	cmcv_reg_t	cmcv;
+
+	cmcv.cmcv_regval = ia64_getreg(_IA64_REG_CR_CMCV);
+
+	cmcv.cmcv_mask = 1; /* Mask/disable interrupt */
+	ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
+
+	IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x disabled.\n",
+		       __func__, smp_processor_id(), cmcv.cmcv_vector);
+}
+
+/*
+ * ia64_mca_cmc_vector_enable
+ *
+ *  Unmask the corrected machine check vector register in the processor.
+ *  This function is invoked on a per-processor basis.
+ *
+ * Inputs
+ *      dummy(unused)
+ *
+ * Outputs
+ *	None
+ */
+static void
+ia64_mca_cmc_vector_enable (void *dummy)
+{
+	cmcv_reg_t	cmcv;
+
+	cmcv.cmcv_regval = ia64_getreg(_IA64_REG_CR_CMCV);
+
+	cmcv.cmcv_mask = 0; /* Unmask/enable interrupt */
+	ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
+
+	IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x enabled.\n",
+		       __func__, smp_processor_id(), cmcv.cmcv_vector);
+}
+
+/*
+ * ia64_mca_cmc_vector_disable_keventd
+ *
+ * Called via keventd (smp_call_function() is not safe in interrupt context) to
+ * disable the cmc interrupt vector.
+ */
+static void
+ia64_mca_cmc_vector_disable_keventd(struct work_struct *unused)
+{
+	on_each_cpu(ia64_mca_cmc_vector_disable, NULL, 0);
+}
+
+/*
+ * ia64_mca_cmc_vector_enable_keventd
+ *
+ * Called via keventd (smp_call_function() is not safe in interrupt context) to
+ * enable the cmc interrupt vector.
+ */
+static void
+ia64_mca_cmc_vector_enable_keventd(struct work_struct *unused)
+{
+	on_each_cpu(ia64_mca_cmc_vector_enable, NULL, 0);
+}
+
+/*
+ * ia64_mca_wakeup
+ *
+ *	Send an inter-cpu interrupt to wake-up a particular cpu.
+ *
+ *  Inputs  :   cpuid
+ *  Outputs :   None
+ */
+static void
+ia64_mca_wakeup(int cpu)
+{
+	ia64_send_ipi(cpu, IA64_MCA_WAKEUP_VECTOR, IA64_IPI_DM_INT, 0);
+}
+
+/*
+ * ia64_mca_wakeup_all
+ *
+ *	Wakeup all the slave cpus which have rendez'ed previously.
+ *
+ *  Inputs  :   None
+ *  Outputs :   None
+ */
+static void
+ia64_mca_wakeup_all(void)
+{
+	int cpu;
+
+	/* Clear the Rendez checkin flag for all cpus */
+	for_each_online_cpu(cpu) {
+		if (ia64_mc_info.imi_rendez_checkin[cpu] == IA64_MCA_RENDEZ_CHECKIN_DONE)
+			ia64_mca_wakeup(cpu);
+	}
+
+}
+
+/*
+ * ia64_mca_rendez_interrupt_handler
+ *
+ *	This is handler used to put slave processors into spinloop
+ *	while the monarch processor does the mca handling and later
+ *	wake each slave up once the monarch is done.  The state
+ *	IA64_MCA_RENDEZ_CHECKIN_DONE indicates the cpu is rendez'ed
+ *	in SAL.  The state IA64_MCA_RENDEZ_CHECKIN_NOTDONE indicates
+ *	the cpu has come out of OS rendezvous.
+ *
+ *  Inputs  :   None
+ *  Outputs :   None
+ */
+static irqreturn_t
+ia64_mca_rendez_int_handler(int rendez_irq, void *arg)
+{
+	unsigned long flags;
+	int cpu = smp_processor_id();
+	struct ia64_mca_notify_die nd =
+		{ .sos = NULL, .monarch_cpu = &monarch_cpu };
+
+	/* Mask all interrupts */
+	local_irq_save(flags);
+
+	NOTIFY_MCA(DIE_MCA_RENDZVOUS_ENTER, get_irq_regs(), (long)&nd, 1);
+
+	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_DONE;
+	/* Register with the SAL monarch that the slave has
+	 * reached SAL
+	 */
+	ia64_sal_mc_rendez();
+
+	NOTIFY_MCA(DIE_MCA_RENDZVOUS_PROCESS, get_irq_regs(), (long)&nd, 1);
+
+	/* Wait for the monarch cpu to exit. */
+	while (monarch_cpu != -1)
+	       cpu_relax();	/* spin until monarch leaves */
+
+	NOTIFY_MCA(DIE_MCA_RENDZVOUS_LEAVE, get_irq_regs(), (long)&nd, 1);
+
+	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+	/* Enable all interrupts */
+	local_irq_restore(flags);
+	return IRQ_HANDLED;
+}
+
+/*
+ * ia64_mca_wakeup_int_handler
+ *
+ *	The interrupt handler for processing the inter-cpu interrupt to the
+ *	slave cpu which was spinning in the rendez loop.
+ *	Since this spinning is done by turning off the interrupts and
+ *	polling on the wakeup-interrupt bit in the IRR, there is
+ *	nothing useful to be done in the handler.
+ *
+ *  Inputs  :   wakeup_irq  (Wakeup-interrupt bit)
+ *	arg		(Interrupt handler specific argument)
+ *  Outputs :   None
+ *
+ */
+static irqreturn_t
+ia64_mca_wakeup_int_handler(int wakeup_irq, void *arg)
+{
+	return IRQ_HANDLED;
+}
+
+/* Function pointer for extra MCA recovery */
+int (*ia64_mca_ucmc_extension)
+	(void*,struct ia64_sal_os_state*)
+	= NULL;
+
+int
+ia64_reg_MCA_extension(int (*fn)(void *, struct ia64_sal_os_state *))
+{
+	if (ia64_mca_ucmc_extension)
+		return 1;
+
+	ia64_mca_ucmc_extension = fn;
+	return 0;
+}
+
+void
+ia64_unreg_MCA_extension(void)
+{
+	if (ia64_mca_ucmc_extension)
+		ia64_mca_ucmc_extension = NULL;
+}
+
+EXPORT_SYMBOL(ia64_reg_MCA_extension);
+EXPORT_SYMBOL(ia64_unreg_MCA_extension);
+
+
+static inline void
+copy_reg(const u64 *fr, u64 fnat, unsigned long *tr, unsigned long *tnat)
+{
+	u64 fslot, tslot, nat;
+	*tr = *fr;
+	fslot = ((unsigned long)fr >> 3) & 63;
+	tslot = ((unsigned long)tr >> 3) & 63;
+	*tnat &= ~(1UL << tslot);
+	nat = (fnat >> fslot) & 1;
+	*tnat |= (nat << tslot);
+}
+
+/* Change the comm field on the MCA/INT task to include the pid that
+ * was interrupted, it makes for easier debugging.  If that pid was 0
+ * (swapper or nested MCA/INIT) then use the start of the previous comm
+ * field suffixed with its cpu.
+ */
+
+static void
+ia64_mca_modify_comm(const struct task_struct *previous_current)
+{
+	char *p, comm[sizeof(current->comm)];
+	if (previous_current->pid)
+		snprintf(comm, sizeof(comm), "%s %d",
+			current->comm, previous_current->pid);
+	else {
+		int l;
+		if ((p = strchr(previous_current->comm, ' ')))
+			l = p - previous_current->comm;
+		else
+			l = strlen(previous_current->comm);
+		snprintf(comm, sizeof(comm), "%s %*s %d",
+			current->comm, l, previous_current->comm,
+			task_thread_info(previous_current)->cpu);
+	}
+	memcpy(current->comm, comm, sizeof(current->comm));
+}
+
+static void
+finish_pt_regs(struct pt_regs *regs, struct ia64_sal_os_state *sos,
+		unsigned long *nat)
+{
+	const struct pal_min_state_area *ms = sos->pal_min_state;
+	const u64 *bank;
+
+	/* If ipsr.ic then use pmsa_{iip,ipsr,ifs}, else use
+	 * pmsa_{xip,xpsr,xfs}
+	 */
+	if (ia64_psr(regs)->ic) {
+		regs->cr_iip = ms->pmsa_iip;
+		regs->cr_ipsr = ms->pmsa_ipsr;
+		regs->cr_ifs = ms->pmsa_ifs;
+	} else {
+		regs->cr_iip = ms->pmsa_xip;
+		regs->cr_ipsr = ms->pmsa_xpsr;
+		regs->cr_ifs = ms->pmsa_xfs;
+
+		sos->iip = ms->pmsa_iip;
+		sos->ipsr = ms->pmsa_ipsr;
+		sos->ifs = ms->pmsa_ifs;
+	}
+	regs->pr = ms->pmsa_pr;
+	regs->b0 = ms->pmsa_br0;
+	regs->ar_rsc = ms->pmsa_rsc;
+	copy_reg(&ms->pmsa_gr[1-1], ms->pmsa_nat_bits, &regs->r1, nat);
+	copy_reg(&ms->pmsa_gr[2-1], ms->pmsa_nat_bits, &regs->r2, nat);
+	copy_reg(&ms->pmsa_gr[3-1], ms->pmsa_nat_bits, &regs->r3, nat);
+	copy_reg(&ms->pmsa_gr[8-1], ms->pmsa_nat_bits, &regs->r8, nat);
+	copy_reg(&ms->pmsa_gr[9-1], ms->pmsa_nat_bits, &regs->r9, nat);
+	copy_reg(&ms->pmsa_gr[10-1], ms->pmsa_nat_bits, &regs->r10, nat);
+	copy_reg(&ms->pmsa_gr[11-1], ms->pmsa_nat_bits, &regs->r11, nat);
+	copy_reg(&ms->pmsa_gr[12-1], ms->pmsa_nat_bits, &regs->r12, nat);
+	copy_reg(&ms->pmsa_gr[13-1], ms->pmsa_nat_bits, &regs->r13, nat);
+	copy_reg(&ms->pmsa_gr[14-1], ms->pmsa_nat_bits, &regs->r14, nat);
+	copy_reg(&ms->pmsa_gr[15-1], ms->pmsa_nat_bits, &regs->r15, nat);
+	if (ia64_psr(regs)->bn)
+		bank = ms->pmsa_bank1_gr;
+	else
+		bank = ms->pmsa_bank0_gr;
+	copy_reg(&bank[16-16], ms->pmsa_nat_bits, &regs->r16, nat);
+	copy_reg(&bank[17-16], ms->pmsa_nat_bits, &regs->r17, nat);
+	copy_reg(&bank[18-16], ms->pmsa_nat_bits, &regs->r18, nat);
+	copy_reg(&bank[19-16], ms->pmsa_nat_bits, &regs->r19, nat);
+	copy_reg(&bank[20-16], ms->pmsa_nat_bits, &regs->r20, nat);
+	copy_reg(&bank[21-16], ms->pmsa_nat_bits, &regs->r21, nat);
+	copy_reg(&bank[22-16], ms->pmsa_nat_bits, &regs->r22, nat);
+	copy_reg(&bank[23-16], ms->pmsa_nat_bits, &regs->r23, nat);
+	copy_reg(&bank[24-16], ms->pmsa_nat_bits, &regs->r24, nat);
+	copy_reg(&bank[25-16], ms->pmsa_nat_bits, &regs->r25, nat);
+	copy_reg(&bank[26-16], ms->pmsa_nat_bits, &regs->r26, nat);
+	copy_reg(&bank[27-16], ms->pmsa_nat_bits, &regs->r27, nat);
+	copy_reg(&bank[28-16], ms->pmsa_nat_bits, &regs->r28, nat);
+	copy_reg(&bank[29-16], ms->pmsa_nat_bits, &regs->r29, nat);
+	copy_reg(&bank[30-16], ms->pmsa_nat_bits, &regs->r30, nat);
+	copy_reg(&bank[31-16], ms->pmsa_nat_bits, &regs->r31, nat);
+}
+
+/* On entry to this routine, we are running on the per cpu stack, see
+ * mca_asm.h.  The original stack has not been touched by this event.  Some of
+ * the original stack's registers will be in the RBS on this stack.  This stack
+ * also contains a partial pt_regs and switch_stack, the rest of the data is in
+ * PAL minstate.
+ *
+ * The first thing to do is modify the original stack to look like a blocked
+ * task so we can run backtrace on the original task.  Also mark the per cpu
+ * stack as current to ensure that we use the correct task state, it also means
+ * that we can do backtrace on the MCA/INIT handler code itself.
+ */
+
+static struct task_struct *
+ia64_mca_modify_original_stack(struct pt_regs *regs,
+		const struct switch_stack *sw,
+		struct ia64_sal_os_state *sos,
+		const char *type)
+{
+	char *p;
+	ia64_va va;
+	extern char ia64_leave_kernel[];	/* Need asm address, not function descriptor */
+	const struct pal_min_state_area *ms = sos->pal_min_state;
+	struct task_struct *previous_current;
+	struct pt_regs *old_regs;
+	struct switch_stack *old_sw;
+	unsigned size = sizeof(struct pt_regs) +
+			sizeof(struct switch_stack) + 16;
+	unsigned long *old_bspstore, *old_bsp;
+	unsigned long *new_bspstore, *new_bsp;
+	unsigned long old_unat, old_rnat, new_rnat, nat;
+	u64 slots, loadrs = regs->loadrs;
+	u64 r12 = ms->pmsa_gr[12-1], r13 = ms->pmsa_gr[13-1];
+	u64 ar_bspstore = regs->ar_bspstore;
+	u64 ar_bsp = regs->ar_bspstore + (loadrs >> 16);
+	const char *msg;
+	int cpu = smp_processor_id();
+
+	previous_current = curr_task(cpu);
+	ia64_set_curr_task(cpu, current);
+	if ((p = strchr(current->comm, ' ')))
+		*p = '\0';
+
+	/* Best effort attempt to cope with MCA/INIT delivered while in
+	 * physical mode.
+	 */
+	regs->cr_ipsr = ms->pmsa_ipsr;
+	if (ia64_psr(regs)->dt == 0) {
+		va.l = r12;
+		if (va.f.reg == 0) {
+			va.f.reg = 7;
+			r12 = va.l;
+		}
+		va.l = r13;
+		if (va.f.reg == 0) {
+			va.f.reg = 7;
+			r13 = va.l;
+		}
+	}
+	if (ia64_psr(regs)->rt == 0) {
+		va.l = ar_bspstore;
+		if (va.f.reg == 0) {
+			va.f.reg = 7;
+			ar_bspstore = va.l;
+		}
+		va.l = ar_bsp;
+		if (va.f.reg == 0) {
+			va.f.reg = 7;
+			ar_bsp = va.l;
+		}
+	}
+
+	/* mca_asm.S ia64_old_stack() cannot assume that the dirty registers
+	 * have been copied to the old stack, the old stack may fail the
+	 * validation tests below.  So ia64_old_stack() must restore the dirty
+	 * registers from the new stack.  The old and new bspstore probably
+	 * have different alignments, so loadrs calculated on the old bsp
+	 * cannot be used to restore from the new bsp.  Calculate a suitable
+	 * loadrs for the new stack and save it in the new pt_regs, where
+	 * ia64_old_stack() can get it.
+	 */
+	old_bspstore = (unsigned long *)ar_bspstore;
+	old_bsp = (unsigned long *)ar_bsp;
+	slots = ia64_rse_num_regs(old_bspstore, old_bsp);
+	new_bspstore = (unsigned long *)((u64)current + IA64_RBS_OFFSET);
+	new_bsp = ia64_rse_skip_regs(new_bspstore, slots);
+	regs->loadrs = (new_bsp - new_bspstore) * 8 << 16;
+
+	/* Verify the previous stack state before we change it */
+	if (user_mode(regs)) {
+		msg = "occurred in user space";
+		/* previous_current is guaranteed to be valid when the task was
+		 * in user space, so ...
+		 */
+		ia64_mca_modify_comm(previous_current);
+		goto no_mod;
+	}
+
+	if (r13 != sos->prev_IA64_KR_CURRENT) {
+		msg = "inconsistent previous current and r13";
+		goto no_mod;
+	}
+
+	if (!mca_recover_range(ms->pmsa_iip)) {
+		if ((r12 - r13) >= KERNEL_STACK_SIZE) {
+			msg = "inconsistent r12 and r13";
+			goto no_mod;
+		}
+		if ((ar_bspstore - r13) >= KERNEL_STACK_SIZE) {
+			msg = "inconsistent ar.bspstore and r13";
+			goto no_mod;
+		}
+		va.p = old_bspstore;
+		if (va.f.reg < 5) {
+			msg = "old_bspstore is in the wrong region";
+			goto no_mod;
+		}
+		if ((ar_bsp - r13) >= KERNEL_STACK_SIZE) {
+			msg = "inconsistent ar.bsp and r13";
+			goto no_mod;
+		}
+		size += (ia64_rse_skip_regs(old_bspstore, slots) - old_bspstore) * 8;
+		if (ar_bspstore + size > r12) {
+			msg = "no room for blocked state";
+			goto no_mod;
+		}
+	}
+
+	ia64_mca_modify_comm(previous_current);
+
+	/* Make the original task look blocked.  First stack a struct pt_regs,
+	 * describing the state at the time of interrupt.  mca_asm.S built a
+	 * partial pt_regs, copy it and fill in the blanks using minstate.
+	 */
+	p = (char *)r12 - sizeof(*regs);
+	old_regs = (struct pt_regs *)p;
+	memcpy(old_regs, regs, sizeof(*regs));
+	old_regs->loadrs = loadrs;
+	old_unat = old_regs->ar_unat;
+	finish_pt_regs(old_regs, sos, &old_unat);
+
+	/* Next stack a struct switch_stack.  mca_asm.S built a partial
+	 * switch_stack, copy it and fill in the blanks using pt_regs and
+	 * minstate.
+	 *
+	 * In the synthesized switch_stack, b0 points to ia64_leave_kernel,
+	 * ar.pfs is set to 0.
+	 *
+	 * unwind.c::unw_unwind() does special processing for interrupt frames.
+	 * It checks if the PRED_NON_SYSCALL predicate is set, if the predicate
+	 * is clear then unw_unwind() does _not_ adjust bsp over pt_regs.  Not
+	 * that this is documented, of course.  Set PRED_NON_SYSCALL in the
+	 * switch_stack on the original stack so it will unwind correctly when
+	 * unwind.c reads pt_regs.
+	 *
+	 * thread.ksp is updated to point to the synthesized switch_stack.
+	 */
+	p -= sizeof(struct switch_stack);
+	old_sw = (struct switch_stack *)p;
+	memcpy(old_sw, sw, sizeof(*sw));
+	old_sw->caller_unat = old_unat;
+	old_sw->ar_fpsr = old_regs->ar_fpsr;
+	copy_reg(&ms->pmsa_gr[4-1], ms->pmsa_nat_bits, &old_sw->r4, &old_unat);
+	copy_reg(&ms->pmsa_gr[5-1], ms->pmsa_nat_bits, &old_sw->r5, &old_unat);
+	copy_reg(&ms->pmsa_gr[6-1], ms->pmsa_nat_bits, &old_sw->r6, &old_unat);
+	copy_reg(&ms->pmsa_gr[7-1], ms->pmsa_nat_bits, &old_sw->r7, &old_unat);
+	old_sw->b0 = (u64)ia64_leave_kernel;
+	old_sw->b1 = ms->pmsa_br1;
+	old_sw->ar_pfs = 0;
+	old_sw->ar_unat = old_unat;
+	old_sw->pr = old_regs->pr | (1UL << PRED_NON_SYSCALL);
+	previous_current->thread.ksp = (u64)p - 16;
+
+	/* Finally copy the original stack's registers back to its RBS.
+	 * Registers from ar.bspstore through ar.bsp at the time of the event
+	 * are in the current RBS, copy them back to the original stack.  The
+	 * copy must be done register by register because the original bspstore
+	 * and the current one have different alignments, so the saved RNAT
+	 * data occurs at different places.
+	 *
+	 * mca_asm does cover, so the old_bsp already includes all registers at
+	 * the time of MCA/INIT.  It also does flushrs, so all registers before
+	 * this function have been written to backing store on the MCA/INIT
+	 * stack.
+	 */
+	new_rnat = ia64_get_rnat(ia64_rse_rnat_addr(new_bspstore));
+	old_rnat = regs->ar_rnat;
+	while (slots--) {
+		if (ia64_rse_is_rnat_slot(new_bspstore)) {
+			new_rnat = ia64_get_rnat(new_bspstore++);
+		}
+		if (ia64_rse_is_rnat_slot(old_bspstore)) {
+			*old_bspstore++ = old_rnat;
+			old_rnat = 0;
+		}
+		nat = (new_rnat >> ia64_rse_slot_num(new_bspstore)) & 1UL;
+		old_rnat &= ~(1UL << ia64_rse_slot_num(old_bspstore));
+		old_rnat |= (nat << ia64_rse_slot_num(old_bspstore));
+		*old_bspstore++ = *new_bspstore++;
+	}
+	old_sw->ar_bspstore = (unsigned long)old_bspstore;
+	old_sw->ar_rnat = old_rnat;
+
+	sos->prev_task = previous_current;
+	return previous_current;
+
+no_mod:
+	mprintk(KERN_INFO "cpu %d, %s %s, original stack not modified\n",
+			smp_processor_id(), type, msg);
+	old_unat = regs->ar_unat;
+	finish_pt_regs(regs, sos, &old_unat);
+	return previous_current;
+}
+
+/* The monarch/slave interaction is based on monarch_cpu and requires that all
+ * slaves have entered rendezvous before the monarch leaves.  If any cpu has
+ * not entered rendezvous yet then wait a bit.  The assumption is that any
+ * slave that has not rendezvoused after a reasonable time is never going to do
+ * so.  In this context, slave includes cpus that respond to the MCA rendezvous
+ * interrupt, as well as cpus that receive the INIT slave event.
+ */
+
+static void
+ia64_wait_for_slaves(int monarch, const char *type)
+{
+	int c, i , wait;
+
+	/*
+	 * wait 5 seconds total for slaves (arbitrary)
+	 */
+	for (i = 0; i < 5000; i++) {
+		wait = 0;
+		for_each_online_cpu(c) {
+			if (c == monarch)
+				continue;
+			if (ia64_mc_info.imi_rendez_checkin[c]
+					== IA64_MCA_RENDEZ_CHECKIN_NOTDONE) {
+				udelay(1000);		/* short wait */
+				wait = 1;
+				break;
+			}
+		}
+		if (!wait)
+			goto all_in;
+	}
+
+	/*
+	 * Maybe slave(s) dead. Print buffered messages immediately.
+	 */
+	ia64_mlogbuf_finish(0);
+	mprintk(KERN_INFO "OS %s slave did not rendezvous on cpu", type);
+	for_each_online_cpu(c) {
+		if (c == monarch)
+			continue;
+		if (ia64_mc_info.imi_rendez_checkin[c] == IA64_MCA_RENDEZ_CHECKIN_NOTDONE)
+			mprintk(" %d", c);
+	}
+	mprintk("\n");
+	return;
+
+all_in:
+	mprintk(KERN_INFO "All OS %s slaves have reached rendezvous\n", type);
+	return;
+}
+
+/*  mca_insert_tr
+ *
+ *  Switch rid when TR reload and needed!
+ *  iord: 1: itr, 2: itr;
+ *
+*/
+static void mca_insert_tr(u64 iord)
+{
+
+	int i;
+	u64 old_rr;
+	struct ia64_tr_entry *p;
+	unsigned long psr;
+	int cpu = smp_processor_id();
+
+	if (!ia64_idtrs[cpu])
+		return;
+
+	psr = ia64_clear_ic();
+	for (i = IA64_TR_ALLOC_BASE; i < IA64_TR_ALLOC_MAX; i++) {
+		p = ia64_idtrs[cpu] + (iord - 1) * IA64_TR_ALLOC_MAX;
+		if (p->pte & 0x1) {
+			old_rr = ia64_get_rr(p->ifa);
+			if (old_rr != p->rr) {
+				ia64_set_rr(p->ifa, p->rr);
+				ia64_srlz_d();
+			}
+			ia64_ptr(iord, p->ifa, p->itir >> 2);
+			ia64_srlz_i();
+			if (iord & 0x1) {
+				ia64_itr(0x1, i, p->ifa, p->pte, p->itir >> 2);
+				ia64_srlz_i();
+			}
+			if (iord & 0x2) {
+				ia64_itr(0x2, i, p->ifa, p->pte, p->itir >> 2);
+				ia64_srlz_i();
+			}
+			if (old_rr != p->rr) {
+				ia64_set_rr(p->ifa, old_rr);
+				ia64_srlz_d();
+			}
+		}
+	}
+	ia64_set_psr(psr);
+}
+
+/*
+ * ia64_mca_handler
+ *
+ *	This is uncorrectable machine check handler called from OS_MCA
+ *	dispatch code which is in turn called from SAL_CHECK().
+ *	This is the place where the core of OS MCA handling is done.
+ *	Right now the logs are extracted and displayed in a well-defined
+ *	format. This handler code is supposed to be run only on the
+ *	monarch processor. Once the monarch is done with MCA handling
+ *	further MCA logging is enabled by clearing logs.
+ *	Monarch also has the duty of sending wakeup-IPIs to pull the
+ *	slave processors out of rendezvous spinloop.
+ *
+ *	If multiple processors call into OS_MCA, the first will become
+ *	the monarch.  Subsequent cpus will be recorded in the mca_cpu
+ *	bitmask.  After the first monarch has processed its MCA, it
+ *	will wake up the next cpu in the mca_cpu bitmask and then go
+ *	into the rendezvous loop.  When all processors have serviced
+ *	their MCA, the last monarch frees up the rest of the processors.
+ */
+void
+ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
+		 struct ia64_sal_os_state *sos)
+{
+	int recover, cpu = smp_processor_id();
+	struct task_struct *previous_current;
+	struct ia64_mca_notify_die nd =
+		{ .sos = sos, .monarch_cpu = &monarch_cpu, .data = &recover };
+	static atomic_t mca_count;
+	static cpumask_t mca_cpu;
+
+	if (atomic_add_return(1, &mca_count) == 1) {
+		monarch_cpu = cpu;
+		sos->monarch = 1;
+	} else {
+		cpumask_set_cpu(cpu, &mca_cpu);
+		sos->monarch = 0;
+	}
+	mprintk(KERN_INFO "Entered OS MCA handler. PSP=%lx cpu=%d "
+		"monarch=%ld\n", sos->proc_state_param, cpu, sos->monarch);
+
+	previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "MCA");
+
+	NOTIFY_MCA(DIE_MCA_MONARCH_ENTER, regs, (long)&nd, 1);
+
+	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
+	if (sos->monarch) {
+		ia64_wait_for_slaves(cpu, "MCA");
+
+		/* Wakeup all the processors which are spinning in the
+		 * rendezvous loop.  They will leave SAL, then spin in the OS
+		 * with interrupts disabled until this monarch cpu leaves the
+		 * MCA handler.  That gets control back to the OS so we can
+		 * backtrace the other cpus, backtrace when spinning in SAL
+		 * does not work.
+		 */
+		ia64_mca_wakeup_all();
+	} else {
+		while (cpumask_test_cpu(cpu, &mca_cpu))
+			cpu_relax();	/* spin until monarch wakes us */
+	}
+
+	NOTIFY_MCA(DIE_MCA_MONARCH_PROCESS, regs, (long)&nd, 1);
+
+	/* Get the MCA error record and log it */
+	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
+
+	/* MCA error recovery */
+	recover = (ia64_mca_ucmc_extension
+		&& ia64_mca_ucmc_extension(
+			IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA),
+			sos));
+
+	if (recover) {
+		sal_log_record_header_t *rh = IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA);
+		rh->severity = sal_log_severity_corrected;
+		ia64_sal_clear_state_info(SAL_INFO_TYPE_MCA);
+		sos->os_status = IA64_MCA_CORRECTED;
+	} else {
+		/* Dump buffered message to console */
+		ia64_mlogbuf_finish(1);
+	}
+
+	if (__this_cpu_read(ia64_mca_tr_reload)) {
+		mca_insert_tr(0x1); /*Reload dynamic itrs*/
+		mca_insert_tr(0x2); /*Reload dynamic itrs*/
+	}
+
+	NOTIFY_MCA(DIE_MCA_MONARCH_LEAVE, regs, (long)&nd, 1);
+
+	if (atomic_dec_return(&mca_count) > 0) {
+		int i;
+
+		/* wake up the next monarch cpu,
+		 * and put this cpu in the rendez loop.
+		 */
+		for_each_online_cpu(i) {
+			if (cpumask_test_cpu(i, &mca_cpu)) {
+				monarch_cpu = i;
+				cpumask_clear_cpu(i, &mca_cpu);	/* wake next cpu */
+				while (monarch_cpu != -1)
+					cpu_relax();	/* spin until last cpu leaves */
+				ia64_set_curr_task(cpu, previous_current);
+				ia64_mc_info.imi_rendez_checkin[cpu]
+						= IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+				return;
+			}
+		}
+	}
+	ia64_set_curr_task(cpu, previous_current);
+	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+	monarch_cpu = -1;	/* This frees the slaves and previous monarchs */
+}
+
+static DECLARE_WORK(cmc_disable_work, ia64_mca_cmc_vector_disable_keventd);
+static DECLARE_WORK(cmc_enable_work, ia64_mca_cmc_vector_enable_keventd);
+
+/*
+ * ia64_mca_cmc_int_handler
+ *
+ *  This is corrected machine check interrupt handler.
+ *	Right now the logs are extracted and displayed in a well-defined
+ *	format.
+ *
+ * Inputs
+ *      interrupt number
+ *      client data arg ptr
+ *
+ * Outputs
+ *	None
+ */
+static irqreturn_t
+ia64_mca_cmc_int_handler(int cmc_irq, void *arg)
+{
+	static unsigned long	cmc_history[CMC_HISTORY_LENGTH];
+	static int		index;
+	static DEFINE_SPINLOCK(cmc_history_lock);
+
+	IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
+		       __func__, cmc_irq, smp_processor_id());
+
+	/* SAL spec states this should run w/ interrupts enabled */
+	local_irq_enable();
+
+	spin_lock(&cmc_history_lock);
+	if (!cmc_polling_enabled) {
+		int i, count = 1; /* we know 1 happened now */
+		unsigned long now = jiffies;
+
+		for (i = 0; i < CMC_HISTORY_LENGTH; i++) {
+			if (now - cmc_history[i] <= HZ)
+				count++;
+		}
+
+		IA64_MCA_DEBUG(KERN_INFO "CMC threshold %d/%d\n", count, CMC_HISTORY_LENGTH);
+		if (count >= CMC_HISTORY_LENGTH) {
+
+			cmc_polling_enabled = 1;
+			spin_unlock(&cmc_history_lock);
+			/* If we're being hit with CMC interrupts, we won't
+			 * ever execute the schedule_work() below.  Need to
+			 * disable CMC interrupts on this processor now.
+			 */
+			ia64_mca_cmc_vector_disable(NULL);
+			schedule_work(&cmc_disable_work);
+
+			/*
+			 * Corrected errors will still be corrected, but
+			 * make sure there's a log somewhere that indicates
+			 * something is generating more than we can handle.
+			 */
+			printk(KERN_WARNING "WARNING: Switching to polling CMC handler; error records may be lost\n");
+
+			mod_timer(&cmc_poll_timer, jiffies + CMC_POLL_INTERVAL);
+
+			/* lock already released, get out now */
+			goto out;
+		} else {
+			cmc_history[index++] = now;
+			if (index == CMC_HISTORY_LENGTH)
+				index = 0;
+		}
+	}
+	spin_unlock(&cmc_history_lock);
+out:
+	/* Get the CMC error record and log it */
+	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CMC);
+
+	local_irq_disable();
+
+	return IRQ_HANDLED;
+}
+
+/*
+ *  ia64_mca_cmc_int_caller
+ *
+ * 	Triggered by sw interrupt from CMC polling routine.  Calls
+ * 	real interrupt handler and either triggers a sw interrupt
+ * 	on the next cpu or does cleanup at the end.
+ *
+ * Inputs
+ *	interrupt number
+ *	client data arg ptr
+ * Outputs
+ * 	handled
+ */
+static irqreturn_t
+ia64_mca_cmc_int_caller(int cmc_irq, void *arg)
+{
+	static int start_count = -1;
+	unsigned int cpuid;
+
+	cpuid = smp_processor_id();
+
+	/* If first cpu, update count */
+	if (start_count == -1)
+		start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CMC);
+
+	ia64_mca_cmc_int_handler(cmc_irq, arg);
+
+	cpuid = cpumask_next(cpuid+1, cpu_online_mask);
+
+	if (cpuid < nr_cpu_ids) {
+		ia64_send_ipi(cpuid, IA64_CMCP_VECTOR, IA64_IPI_DM_INT, 0);
+	} else {
+		/* If no log record, switch out of polling mode */
+		if (start_count == IA64_LOG_COUNT(SAL_INFO_TYPE_CMC)) {
+
+			printk(KERN_WARNING "Returning to interrupt driven CMC handler\n");
+			schedule_work(&cmc_enable_work);
+			cmc_polling_enabled = 0;
+
+		} else {
+
+			mod_timer(&cmc_poll_timer, jiffies + CMC_POLL_INTERVAL);
+		}
+
+		start_count = -1;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ *  ia64_mca_cmc_poll
+ *
+ *	Poll for Corrected Machine Checks (CMCs)
+ *
+ * Inputs   :   dummy(unused)
+ * Outputs  :   None
+ *
+ */
+static void
+ia64_mca_cmc_poll (struct timer_list *unused)
+{
+	/* Trigger a CMC interrupt cascade  */
+	ia64_send_ipi(cpumask_first(cpu_online_mask), IA64_CMCP_VECTOR,
+							IA64_IPI_DM_INT, 0);
+}
+
+/*
+ *  ia64_mca_cpe_int_caller
+ *
+ * 	Triggered by sw interrupt from CPE polling routine.  Calls
+ * 	real interrupt handler and either triggers a sw interrupt
+ * 	on the next cpu or does cleanup at the end.
+ *
+ * Inputs
+ *	interrupt number
+ *	client data arg ptr
+ * Outputs
+ * 	handled
+ */
+static irqreturn_t
+ia64_mca_cpe_int_caller(int cpe_irq, void *arg)
+{
+	static int start_count = -1;
+	static int poll_time = MIN_CPE_POLL_INTERVAL;
+	unsigned int cpuid;
+
+	cpuid = smp_processor_id();
+
+	/* If first cpu, update count */
+	if (start_count == -1)
+		start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CPE);
+
+	ia64_mca_cpe_int_handler(cpe_irq, arg);
+
+	cpuid = cpumask_next(cpuid+1, cpu_online_mask);
+
+	if (cpuid < NR_CPUS) {
+		ia64_send_ipi(cpuid, IA64_CPEP_VECTOR, IA64_IPI_DM_INT, 0);
+	} else {
+		/*
+		 * If a log was recorded, increase our polling frequency,
+		 * otherwise, backoff or return to interrupt mode.
+		 */
+		if (start_count != IA64_LOG_COUNT(SAL_INFO_TYPE_CPE)) {
+			poll_time = max(MIN_CPE_POLL_INTERVAL, poll_time / 2);
+		} else if (cpe_vector < 0) {
+			poll_time = min(MAX_CPE_POLL_INTERVAL, poll_time * 2);
+		} else {
+			poll_time = MIN_CPE_POLL_INTERVAL;
+
+			printk(KERN_WARNING "Returning to interrupt driven CPE handler\n");
+			enable_irq(local_vector_to_irq(IA64_CPE_VECTOR));
+			cpe_poll_enabled = 0;
+		}
+
+		if (cpe_poll_enabled)
+			mod_timer(&cpe_poll_timer, jiffies + poll_time);
+		start_count = -1;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ *  ia64_mca_cpe_poll
+ *
+ *	Poll for Corrected Platform Errors (CPEs), trigger interrupt
+ *	on first cpu, from there it will trickle through all the cpus.
+ *
+ * Inputs   :   dummy(unused)
+ * Outputs  :   None
+ *
+ */
+static void
+ia64_mca_cpe_poll (struct timer_list *unused)
+{
+	/* Trigger a CPE interrupt cascade  */
+	ia64_send_ipi(cpumask_first(cpu_online_mask), IA64_CPEP_VECTOR,
+							IA64_IPI_DM_INT, 0);
+}
+
+static int
+default_monarch_init_process(struct notifier_block *self, unsigned long val, void *data)
+{
+	int c;
+	struct task_struct *g, *t;
+	if (val != DIE_INIT_MONARCH_PROCESS)
+		return NOTIFY_DONE;
+#ifdef CONFIG_KEXEC
+	if (atomic_read(&kdump_in_progress))
+		return NOTIFY_DONE;
+#endif
+
+	/*
+	 * FIXME: mlogbuf will brim over with INIT stack dumps.
+	 * To enable show_stack from INIT, we use oops_in_progress which should
+	 * be used in real oops. This would cause something wrong after INIT.
+	 */
+	BREAK_LOGLEVEL(console_loglevel);
+	ia64_mlogbuf_dump_from_init();
+
+	printk(KERN_ERR "Processes interrupted by INIT -");
+	for_each_online_cpu(c) {
+		struct ia64_sal_os_state *s;
+		t = __va(__per_cpu_mca[c] + IA64_MCA_CPU_INIT_STACK_OFFSET);
+		s = (struct ia64_sal_os_state *)((char *)t + MCA_SOS_OFFSET);
+		g = s->prev_task;
+		if (g) {
+			if (g->pid)
+				printk(" %d", g->pid);
+			else
+				printk(" %d (cpu %d task 0x%p)", g->pid, task_cpu(g), g);
+		}
+	}
+	printk("\n\n");
+	if (read_trylock(&tasklist_lock)) {
+		do_each_thread (g, t) {
+			printk("\nBacktrace of pid %d (%s)\n", t->pid, t->comm);
+			show_stack(t, NULL, KERN_DEFAULT);
+		} while_each_thread (g, t);
+		read_unlock(&tasklist_lock);
+	}
+	/* FIXME: This will not restore zapped printk locks. */
+	RESTORE_LOGLEVEL(console_loglevel);
+	return NOTIFY_DONE;
+}
+
+/*
+ * C portion of the OS INIT handler
+ *
+ * Called from ia64_os_init_dispatch
+ *
+ * Inputs: pointer to pt_regs where processor info was saved.  SAL/OS state for
+ * this event.  This code is used for both monarch and slave INIT events, see
+ * sos->monarch.
+ *
+ * All INIT events switch to the INIT stack and change the previous process to
+ * blocked status.  If one of the INIT events is the monarch then we are
+ * probably processing the nmi button/command.  Use the monarch cpu to dump all
+ * the processes.  The slave INIT events all spin until the monarch cpu
+ * returns.  We can also get INIT slave events for MCA, in which case the MCA
+ * process is the monarch.
+ */
+
+void
+ia64_init_handler(struct pt_regs *regs, struct switch_stack *sw,
+		  struct ia64_sal_os_state *sos)
+{
+	static atomic_t slaves;
+	static atomic_t monarchs;
+	struct task_struct *previous_current;
+	int cpu = smp_processor_id();
+	struct ia64_mca_notify_die nd =
+		{ .sos = sos, .monarch_cpu = &monarch_cpu };
+
+	NOTIFY_INIT(DIE_INIT_ENTER, regs, (long)&nd, 0);
+
+	mprintk(KERN_INFO "Entered OS INIT handler. PSP=%lx cpu=%d monarch=%ld\n",
+		sos->proc_state_param, cpu, sos->monarch);
+	salinfo_log_wakeup(SAL_INFO_TYPE_INIT, NULL, 0, 0);
+
+	previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "INIT");
+	sos->os_status = IA64_INIT_RESUME;
+
+	/* FIXME: Workaround for broken proms that drive all INIT events as
+	 * slaves.  The last slave that enters is promoted to be a monarch.
+	 * Remove this code in September 2006, that gives platforms a year to
+	 * fix their proms and get their customers updated.
+	 */
+	if (!sos->monarch && atomic_add_return(1, &slaves) == num_online_cpus()) {
+		mprintk(KERN_WARNING "%s: Promoting cpu %d to monarch.\n",
+		        __func__, cpu);
+		atomic_dec(&slaves);
+		sos->monarch = 1;
+	}
+
+	/* FIXME: Workaround for broken proms that drive all INIT events as
+	 * monarchs.  Second and subsequent monarchs are demoted to slaves.
+	 * Remove this code in September 2006, that gives platforms a year to
+	 * fix their proms and get their customers updated.
+	 */
+	if (sos->monarch && atomic_add_return(1, &monarchs) > 1) {
+		mprintk(KERN_WARNING "%s: Demoting cpu %d to slave.\n",
+			       __func__, cpu);
+		atomic_dec(&monarchs);
+		sos->monarch = 0;
+	}
+
+	if (!sos->monarch) {
+		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_INIT;
+
+#ifdef CONFIG_KEXEC
+		while (monarch_cpu == -1 && !atomic_read(&kdump_in_progress))
+			udelay(1000);
+#else
+		while (monarch_cpu == -1)
+			cpu_relax();	/* spin until monarch enters */
+#endif
+
+		NOTIFY_INIT(DIE_INIT_SLAVE_ENTER, regs, (long)&nd, 1);
+		NOTIFY_INIT(DIE_INIT_SLAVE_PROCESS, regs, (long)&nd, 1);
+
+#ifdef CONFIG_KEXEC
+		while (monarch_cpu != -1 && !atomic_read(&kdump_in_progress))
+			udelay(1000);
+#else
+		while (monarch_cpu != -1)
+			cpu_relax();	/* spin until monarch leaves */
+#endif
+
+		NOTIFY_INIT(DIE_INIT_SLAVE_LEAVE, regs, (long)&nd, 1);
+
+		mprintk("Slave on cpu %d returning to normal service.\n", cpu);
+		ia64_set_curr_task(cpu, previous_current);
+		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+		atomic_dec(&slaves);
+		return;
+	}
+
+	monarch_cpu = cpu;
+	NOTIFY_INIT(DIE_INIT_MONARCH_ENTER, regs, (long)&nd, 1);
+
+	/*
+	 * Wait for a bit.  On some machines (e.g., HP's zx2000 and zx6000, INIT can be
+	 * generated via the BMC's command-line interface, but since the console is on the
+	 * same serial line, the user will need some time to switch out of the BMC before
+	 * the dump begins.
+	 */
+	mprintk("Delaying for 5 seconds...\n");
+	udelay(5*1000000);
+	ia64_wait_for_slaves(cpu, "INIT");
+	/* If nobody intercepts DIE_INIT_MONARCH_PROCESS then we drop through
+	 * to default_monarch_init_process() above and just print all the
+	 * tasks.
+	 */
+	NOTIFY_INIT(DIE_INIT_MONARCH_PROCESS, regs, (long)&nd, 1);
+	NOTIFY_INIT(DIE_INIT_MONARCH_LEAVE, regs, (long)&nd, 1);
+
+	mprintk("\nINIT dump complete.  Monarch on cpu %d returning to normal service.\n", cpu);
+	atomic_dec(&monarchs);
+	ia64_set_curr_task(cpu, previous_current);
+	monarch_cpu = -1;
+	return;
+}
+
+static int __init
+ia64_mca_disable_cpe_polling(char *str)
+{
+	cpe_poll_enabled = 0;
+	return 1;
+}
+
+__setup("disable_cpe_poll", ia64_mca_disable_cpe_polling);
+
+/* Minimal format of the MCA/INIT stacks.  The pseudo processes that run on
+ * these stacks can never sleep, they cannot return from the kernel to user
+ * space, they do not appear in a normal ps listing.  So there is no need to
+ * format most of the fields.
+ */
+
+static void
+format_mca_init_stack(void *mca_data, unsigned long offset,
+		const char *type, int cpu)
+{
+	struct task_struct *p = (struct task_struct *)((char *)mca_data + offset);
+	struct thread_info *ti;
+	memset(p, 0, KERNEL_STACK_SIZE);
+	ti = task_thread_info(p);
+	ti->flags = _TIF_MCA_INIT;
+	ti->preempt_count = 1;
+	ti->task = p;
+	ti->cpu = cpu;
+	p->stack = ti;
+	p->__state = TASK_UNINTERRUPTIBLE;
+	cpumask_set_cpu(cpu, &p->cpus_mask);
+	INIT_LIST_HEAD(&p->tasks);
+	p->parent = p->real_parent = p->group_leader = p;
+	INIT_LIST_HEAD(&p->children);
+	INIT_LIST_HEAD(&p->sibling);
+	strscpy(p->comm, type, sizeof(p->comm)-1);
+}
+
+/* Caller prevents this from being called after init */
+static void * __ref mca_bootmem(void)
+{
+	return memblock_alloc(sizeof(struct ia64_mca_cpu), KERNEL_STACK_SIZE);
+}
+
+/* Do per-CPU MCA-related initialization.  */
+void
+ia64_mca_cpu_init(void *cpu_data)
+{
+	void *pal_vaddr;
+	void *data;
+	long sz = sizeof(struct ia64_mca_cpu);
+	int cpu = smp_processor_id();
+	static int first_time = 1;
+
+	/*
+	 * Structure will already be allocated if cpu has been online,
+	 * then offlined.
+	 */
+	if (__per_cpu_mca[cpu]) {
+		data = __va(__per_cpu_mca[cpu]);
+	} else {
+		if (first_time) {
+			data = mca_bootmem();
+			first_time = 0;
+		} else
+			data = (void *)__get_free_pages(GFP_ATOMIC,
+							get_order(sz));
+		if (!data)
+			panic("Could not allocate MCA memory for cpu %d\n",
+					cpu);
+	}
+	format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, mca_stack),
+		"MCA", cpu);
+	format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, init_stack),
+		"INIT", cpu);
+	__this_cpu_write(ia64_mca_data, (__per_cpu_mca[cpu] = __pa(data)));
+
+	/*
+	 * Stash away a copy of the PTE needed to map the per-CPU page.
+	 * We may need it during MCA recovery.
+	 */
+	__this_cpu_write(ia64_mca_per_cpu_pte,
+		pte_val(mk_pte_phys(__pa(cpu_data), PAGE_KERNEL)));
+
+	/*
+	 * Also, stash away a copy of the PAL address and the PTE
+	 * needed to map it.
+	 */
+	pal_vaddr = efi_get_pal_addr();
+	if (!pal_vaddr)
+		return;
+	__this_cpu_write(ia64_mca_pal_base,
+		GRANULEROUNDDOWN((unsigned long) pal_vaddr));
+	__this_cpu_write(ia64_mca_pal_pte, pte_val(mk_pte_phys(__pa(pal_vaddr),
+							      PAGE_KERNEL)));
+}
+
+static int ia64_mca_cpu_online(unsigned int cpu)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (!cmc_polling_enabled)
+		ia64_mca_cmc_vector_enable(NULL);
+	local_irq_restore(flags);
+	return 0;
+}
+
+/*
+ * ia64_mca_init
+ *
+ *  Do all the system level mca specific initialization.
+ *
+ *	1. Register spinloop and wakeup request interrupt vectors
+ *
+ *	2. Register OS_MCA handler entry point
+ *
+ *	3. Register OS_INIT handler entry point
+ *
+ *  4. Initialize MCA/CMC/INIT related log buffers maintained by the OS.
+ *
+ *  Note that this initialization is done very early before some kernel
+ *  services are available.
+ *
+ *  Inputs  :   None
+ *
+ *  Outputs :   None
+ */
+void __init
+ia64_mca_init(void)
+{
+	ia64_fptr_t *init_hldlr_ptr_monarch = (ia64_fptr_t *)ia64_os_init_dispatch_monarch;
+	ia64_fptr_t *init_hldlr_ptr_slave = (ia64_fptr_t *)ia64_os_init_dispatch_slave;
+	ia64_fptr_t *mca_hldlr_ptr = (ia64_fptr_t *)ia64_os_mca_dispatch;
+	int i;
+	long rc;
+	struct ia64_sal_retval isrv;
+	unsigned long timeout = IA64_MCA_RENDEZ_TIMEOUT; /* platform specific */
+	static struct notifier_block default_init_monarch_nb = {
+		.notifier_call = default_monarch_init_process,
+		.priority = 0/* we need to notified last */
+	};
+
+	IA64_MCA_DEBUG("%s: begin\n", __func__);
+
+	/* Clear the Rendez checkin flag for all cpus */
+	for(i = 0 ; i < NR_CPUS; i++)
+		ia64_mc_info.imi_rendez_checkin[i] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+
+	/*
+	 * Register the rendezvous spinloop and wakeup mechanism with SAL
+	 */
+
+	/* Register the rendezvous interrupt vector with SAL */
+	while (1) {
+		isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_INT,
+					      SAL_MC_PARAM_MECHANISM_INT,
+					      IA64_MCA_RENDEZ_VECTOR,
+					      timeout,
+					      SAL_MC_PARAM_RZ_ALWAYS);
+		rc = isrv.status;
+		if (rc == 0)
+			break;
+		if (rc == -2) {
+			printk(KERN_INFO "Increasing MCA rendezvous timeout from "
+				"%ld to %ld milliseconds\n", timeout, isrv.v0);
+			timeout = isrv.v0;
+			NOTIFY_MCA(DIE_MCA_NEW_TIMEOUT, NULL, timeout, 0);
+			continue;
+		}
+		printk(KERN_ERR "Failed to register rendezvous interrupt "
+		       "with SAL (status %ld)\n", rc);
+		return;
+	}
+
+	/* Register the wakeup interrupt vector with SAL */
+	isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_WAKEUP,
+				      SAL_MC_PARAM_MECHANISM_INT,
+				      IA64_MCA_WAKEUP_VECTOR,
+				      0, 0);
+	rc = isrv.status;
+	if (rc) {
+		printk(KERN_ERR "Failed to register wakeup interrupt with SAL "
+		       "(status %ld)\n", rc);
+		return;
+	}
+
+	IA64_MCA_DEBUG("%s: registered MCA rendezvous spinloop and wakeup mech.\n", __func__);
+
+	ia64_mc_info.imi_mca_handler        = ia64_tpa(mca_hldlr_ptr->fp);
+	/*
+	 * XXX - disable SAL checksum by setting size to 0; should be
+	 *	ia64_tpa(ia64_os_mca_dispatch_end) - ia64_tpa(ia64_os_mca_dispatch);
+	 */
+	ia64_mc_info.imi_mca_handler_size	= 0;
+
+	/* Register the os mca handler with SAL */
+	if ((rc = ia64_sal_set_vectors(SAL_VECTOR_OS_MCA,
+				       ia64_mc_info.imi_mca_handler,
+				       ia64_tpa(mca_hldlr_ptr->gp),
+				       ia64_mc_info.imi_mca_handler_size,
+				       0, 0, 0)))
+	{
+		printk(KERN_ERR "Failed to register OS MCA handler with SAL "
+		       "(status %ld)\n", rc);
+		return;
+	}
+
+	IA64_MCA_DEBUG("%s: registered OS MCA handler with SAL at 0x%lx, gp = 0x%lx\n", __func__,
+		       ia64_mc_info.imi_mca_handler, ia64_tpa(mca_hldlr_ptr->gp));
+
+	/*
+	 * XXX - disable SAL checksum by setting size to 0, should be
+	 * size of the actual init handler in mca_asm.S.
+	 */
+	ia64_mc_info.imi_monarch_init_handler		= ia64_tpa(init_hldlr_ptr_monarch->fp);
+	ia64_mc_info.imi_monarch_init_handler_size	= 0;
+	ia64_mc_info.imi_slave_init_handler		= ia64_tpa(init_hldlr_ptr_slave->fp);
+	ia64_mc_info.imi_slave_init_handler_size	= 0;
+
+	IA64_MCA_DEBUG("%s: OS INIT handler at %lx\n", __func__,
+		       ia64_mc_info.imi_monarch_init_handler);
+
+	/* Register the os init handler with SAL */
+	if ((rc = ia64_sal_set_vectors(SAL_VECTOR_OS_INIT,
+				       ia64_mc_info.imi_monarch_init_handler,
+				       ia64_tpa(ia64_getreg(_IA64_REG_GP)),
+				       ia64_mc_info.imi_monarch_init_handler_size,
+				       ia64_mc_info.imi_slave_init_handler,
+				       ia64_tpa(ia64_getreg(_IA64_REG_GP)),
+				       ia64_mc_info.imi_slave_init_handler_size)))
+	{
+		printk(KERN_ERR "Failed to register m/s INIT handlers with SAL "
+		       "(status %ld)\n", rc);
+		return;
+	}
+	if (register_die_notifier(&default_init_monarch_nb)) {
+		printk(KERN_ERR "Failed to register default monarch INIT process\n");
+		return;
+	}
+
+	IA64_MCA_DEBUG("%s: registered OS INIT handler with SAL\n", __func__);
+
+	/* Initialize the areas set aside by the OS to buffer the
+	 * platform/processor error states for MCA/INIT/CMC
+	 * handling.
+	 */
+	ia64_log_init(SAL_INFO_TYPE_MCA);
+	ia64_log_init(SAL_INFO_TYPE_INIT);
+	ia64_log_init(SAL_INFO_TYPE_CMC);
+	ia64_log_init(SAL_INFO_TYPE_CPE);
+
+	mca_init = 1;
+	printk(KERN_INFO "MCA related initialization done\n");
+}
+
+
+/*
+ * These pieces cannot be done in ia64_mca_init() because it is called before
+ * early_irq_init() which would wipe out our percpu irq registrations. But we
+ * cannot leave them until ia64_mca_late_init() because by then all the other
+ * processors have been brought online and have set their own CMC vectors to
+ * point at a non-existant action. Called from arch_early_irq_init().
+ */
+void __init ia64_mca_irq_init(void)
+{
+	/*
+	 *  Configure the CMCI/P vector and handler. Interrupts for CMC are
+	 *  per-processor, so AP CMC interrupts are setup in smp_callin() (smpboot.c).
+	 */
+	register_percpu_irq(IA64_CMC_VECTOR, ia64_mca_cmc_int_handler, 0,
+			    "cmc_hndlr");
+	register_percpu_irq(IA64_CMCP_VECTOR, ia64_mca_cmc_int_caller, 0,
+			    "cmc_poll");
+	ia64_mca_cmc_vector_setup();       /* Setup vector on BSP */
+
+	/* Setup the MCA rendezvous interrupt vector */
+	register_percpu_irq(IA64_MCA_RENDEZ_VECTOR, ia64_mca_rendez_int_handler,
+			    0, "mca_rdzv");
+
+	/* Setup the MCA wakeup interrupt vector */
+	register_percpu_irq(IA64_MCA_WAKEUP_VECTOR, ia64_mca_wakeup_int_handler,
+			    0, "mca_wkup");
+
+	/* Setup the CPEI/P handler */
+	register_percpu_irq(IA64_CPEP_VECTOR, ia64_mca_cpe_int_caller, 0,
+			    "cpe_poll");
+}
+
+/*
+ * ia64_mca_late_init
+ *
+ *	Opportunity to setup things that require initialization later
+ *	than ia64_mca_init.  Setup a timer to poll for CPEs if the
+ *	platform doesn't support an interrupt driven mechanism.
+ *
+ *  Inputs  :   None
+ *  Outputs :   Status
+ */
+static int __init
+ia64_mca_late_init(void)
+{
+	if (!mca_init)
+		return 0;
+
+	/* Setup the CMCI/P vector and handler */
+	timer_setup(&cmc_poll_timer, ia64_mca_cmc_poll, 0);
+
+	/* Unmask/enable the vector */
+	cmc_polling_enabled = 0;
+	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/mca:online",
+			  ia64_mca_cpu_online, NULL);
+	IA64_MCA_DEBUG("%s: CMCI/P setup and enabled.\n", __func__);
+
+	/* Setup the CPEI/P vector and handler */
+	cpe_vector = acpi_request_vector(ACPI_INTERRUPT_CPEI);
+	timer_setup(&cpe_poll_timer, ia64_mca_cpe_poll, 0);
+
+	{
+		unsigned int irq;
+
+		if (cpe_vector >= 0) {
+			/* If platform supports CPEI, enable the irq. */
+			irq = local_vector_to_irq(cpe_vector);
+			if (irq > 0) {
+				cpe_poll_enabled = 0;
+				irq_set_status_flags(irq, IRQ_PER_CPU);
+				if (request_irq(irq, ia64_mca_cpe_int_handler,
+						0, "cpe_hndlr", NULL))
+					pr_err("Failed to register cpe_hndlr interrupt\n");
+				ia64_cpe_irq = irq;
+				ia64_mca_register_cpev(cpe_vector);
+				IA64_MCA_DEBUG("%s: CPEI/P setup and enabled.\n",
+					__func__);
+				return 0;
+			}
+			printk(KERN_ERR "%s: Failed to find irq for CPE "
+					"interrupt handler, vector %d\n",
+					__func__, cpe_vector);
+		}
+		/* If platform doesn't support CPEI, get the timer going. */
+		if (cpe_poll_enabled) {
+			ia64_mca_cpe_poll(0UL);
+			IA64_MCA_DEBUG("%s: CPEP setup and enabled.\n", __func__);
+		}
+	}
+
+	return 0;
+}
+
+device_initcall(ia64_mca_late_init);
diff --git a/arch/ia64/kernel/mca_asm.S b/arch/ia64/kernel/mca_asm.S
new file mode 100644
index 000000000..0d6b8cf9d
--- /dev/null
+++ b/arch/ia64/kernel/mca_asm.S
@@ -0,0 +1,1123 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * File:	mca_asm.S
+ * Purpose:	assembly portion of the IA64 MCA handling
+ *
+ * Mods by cfleck to integrate into kernel build
+ *
+ * 2000-03-15 David Mosberger-Tang <davidm@hpl.hp.com>
+ *		Added various stop bits to get a clean compile
+ *
+ * 2000-03-29 Chuck Fleckenstein <cfleck@co.intel.com>
+ *		Added code to save INIT handoff state in pt_regs format,
+ *		switch to temp kstack, switch modes, jump to C INIT handler
+ *
+ * 2002-01-04 J.Hall <jenna.s.hall@intel.com>
+ *		Before entering virtual mode code:
+ *		 1. Check for TLB CPU error
+ *		 2. Restore current thread pointer to kr6
+ *		 3. Move stack ptr 16 bytes to conform to C calling convention
+ *
+ * 2004-11-12 Russ Anderson <rja@sgi.com>
+ *		Added per cpu MCA/INIT stack save areas.
+ *
+ * 2005-12-08 Keith Owens <kaos@sgi.com>
+ *		Use per cpu MCA/INIT stacks for all data.
+ */
+#include <linux/threads.h>
+#include <linux/pgtable.h>
+
+#include <asm/asmmacro.h>
+#include <asm/processor.h>
+#include <asm/mca_asm.h>
+#include <asm/mca.h>
+
+#include "entry.h"
+
+#define GET_IA64_MCA_DATA(reg)						\
+	GET_THIS_PADDR(reg, ia64_mca_data)				\
+	;;								\
+	ld8 reg=[reg]
+
+	.global ia64_do_tlb_purge
+	.global ia64_os_mca_dispatch
+	.global ia64_os_init_on_kdump
+	.global ia64_os_init_dispatch_monarch
+	.global ia64_os_init_dispatch_slave
+
+	.text
+	.align 16
+
+//StartMain////////////////////////////////////////////////////////////////////
+
+/*
+ * Just the TLB purge part is moved to a separate function
+ * so we can re-use the code for cpu hotplug code as well
+ * Caller should now setup b1, so we can branch once the
+ * tlb flush is complete.
+ */
+
+ia64_do_tlb_purge:
+#define O(member)	IA64_CPUINFO_##member##_OFFSET
+
+	GET_THIS_PADDR(r2, ia64_cpu_info) // load phys addr of cpu_info into r2
+	;;
+	addl r17=O(PTCE_STRIDE),r2
+	addl r2=O(PTCE_BASE),r2
+	;;
+	ld8 r18=[r2],(O(PTCE_COUNT)-O(PTCE_BASE));;	// r18=ptce_base
+	ld4 r19=[r2],4					// r19=ptce_count[0]
+	ld4 r21=[r17],4					// r21=ptce_stride[0]
+	;;
+	ld4 r20=[r2]					// r20=ptce_count[1]
+	ld4 r22=[r17]					// r22=ptce_stride[1]
+	mov r24=0
+	;;
+	adds r20=-1,r20
+	;;
+#undef O
+
+2:
+	cmp.ltu p6,p7=r24,r19
+(p7)	br.cond.dpnt.few 4f
+	mov ar.lc=r20
+3:
+	ptc.e r18
+	;;
+	add r18=r22,r18
+	br.cloop.sptk.few 3b
+	;;
+	add r18=r21,r18
+	add r24=1,r24
+	;;
+	br.sptk.few 2b
+4:
+	srlz.i 			// srlz.i implies srlz.d
+	;;
+
+        // Now purge addresses formerly mapped by TR registers
+	// 1. Purge ITR&DTR for kernel.
+	movl r16=KERNEL_START
+	mov r18=KERNEL_TR_PAGE_SHIFT<<2
+	;;
+	ptr.i r16, r18
+	ptr.d r16, r18
+	;;
+	srlz.i
+	;;
+	srlz.d
+	;;
+	// 3. Purge ITR for PAL code.
+	GET_THIS_PADDR(r2, ia64_mca_pal_base)
+	;;
+	ld8 r16=[r2]
+	mov r18=IA64_GRANULE_SHIFT<<2
+	;;
+	ptr.i r16,r18
+	;;
+	srlz.i
+	;;
+	// 4. Purge DTR for stack.
+	mov r16=IA64_KR(CURRENT_STACK)
+	;;
+	shl r16=r16,IA64_GRANULE_SHIFT
+	movl r19=PAGE_OFFSET
+	;;
+	add r16=r19,r16
+	mov r18=IA64_GRANULE_SHIFT<<2
+	;;
+	ptr.d r16,r18
+	;;
+	srlz.i
+	;;
+	// Now branch away to caller.
+	br.sptk.many b1
+	;;
+
+//EndMain//////////////////////////////////////////////////////////////////////
+
+//StartMain////////////////////////////////////////////////////////////////////
+
+ia64_os_mca_dispatch:
+	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	mov r19=1				// All MCA events are treated as monarch (for now)
+	br.sptk ia64_state_save			// save the state that is not in minstate
+1:
+
+	GET_IA64_MCA_DATA(r2)
+	// Using MCA stack, struct ia64_sal_os_state, variable proc_state_param
+	;;
+	add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+SOS(PROC_STATE_PARAM), r2
+	;;
+	ld8 r18=[r3]				// Get processor state parameter on existing PALE_CHECK.
+	;;
+	tbit.nz p6,p7=r18,60
+(p7)	br.spnt done_tlb_purge_and_reload
+
+	// The following code purges TC and TR entries. Then reload all TC entries.
+	// Purge percpu data TC entries.
+begin_tlb_purge_and_reload:
+	movl r18=ia64_reload_tr;;
+	LOAD_PHYSICAL(p0,r18,ia64_reload_tr);;
+	mov b1=r18;;
+	br.sptk.many ia64_do_tlb_purge;;
+
+ia64_reload_tr:
+	// Finally reload the TR registers.
+	// 1. Reload DTR/ITR registers for kernel.
+	mov r18=KERNEL_TR_PAGE_SHIFT<<2
+	movl r17=KERNEL_START
+	;;
+	mov cr.itir=r18
+	mov cr.ifa=r17
+        mov r16=IA64_TR_KERNEL
+	mov r19=ip
+	movl r18=PAGE_KERNEL
+	;;
+        dep r17=0,r19,0, KERNEL_TR_PAGE_SHIFT
+	;;
+	or r18=r17,r18
+	;;
+        itr.i itr[r16]=r18
+	;;
+        itr.d dtr[r16]=r18
+        ;;
+	srlz.i
+	srlz.d
+	;;
+	// 3. Reload ITR for PAL code.
+	GET_THIS_PADDR(r2, ia64_mca_pal_pte)
+	;;
+	ld8 r18=[r2]			// load PAL PTE
+	;;
+	GET_THIS_PADDR(r2, ia64_mca_pal_base)
+	;;
+	ld8 r16=[r2]			// load PAL vaddr
+	mov r19=IA64_GRANULE_SHIFT<<2
+	;;
+	mov cr.itir=r19
+	mov cr.ifa=r16
+	mov r20=IA64_TR_PALCODE
+	;;
+	itr.i itr[r20]=r18
+	;;
+	srlz.i
+	;;
+	// 4. Reload DTR for stack.
+	mov r16=IA64_KR(CURRENT_STACK)
+	;;
+	shl r16=r16,IA64_GRANULE_SHIFT
+	movl r19=PAGE_OFFSET
+	;;
+	add r18=r19,r16
+	movl r20=PAGE_KERNEL
+	;;
+	add r16=r20,r16
+	mov r19=IA64_GRANULE_SHIFT<<2
+	;;
+	mov cr.itir=r19
+	mov cr.ifa=r18
+	mov r20=IA64_TR_CURRENT_STACK
+	;;
+	itr.d dtr[r20]=r16
+	GET_THIS_PADDR(r2, ia64_mca_tr_reload)
+	mov r18 = 1
+	;;
+	srlz.d
+	;;
+	st8 [r2] =r18
+	;;
+
+done_tlb_purge_and_reload:
+
+	// switch to per cpu MCA stack
+	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_new_stack
+1:
+
+	// everything saved, now we can set the kernel registers
+	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_set_kernel_registers
+1:
+
+	// This must be done in physical mode
+	GET_IA64_MCA_DATA(r2)
+	;;
+	mov r7=r2
+
+        // Enter virtual mode from physical mode
+	VIRTUAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_begin, r4)
+
+	// This code returns to SAL via SOS r2, in general SAL has no unwind
+	// data.  To get a clean termination when backtracing the C MCA/INIT
+	// handler, set a dummy return address of 0 in this routine.  That
+	// requires that ia64_os_mca_virtual_begin be a global function.
+ENTRY(ia64_os_mca_virtual_begin)
+	.prologue
+	.save rp,r0
+	.body
+
+	mov ar.rsc=3				// set eager mode for C handler
+	mov r2=r7				// see GET_IA64_MCA_DATA above
+	;;
+
+	// Call virtual mode handler
+	alloc r14=ar.pfs,0,0,3,0
+	;;
+	DATA_PA_TO_VA(r2,r7)
+	;;
+	add out0=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
+	add out1=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
+	add out2=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET, r2
+	br.call.sptk.many    b0=ia64_mca_handler
+
+	// Revert back to physical mode before going back to SAL
+	PHYSICAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_end, r4)
+ia64_os_mca_virtual_end:
+
+END(ia64_os_mca_virtual_begin)
+
+	// switch back to previous stack
+	alloc r14=ar.pfs,0,0,0,0		// remove the MCA handler frame
+	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_old_stack
+1:
+
+	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_state_restore		// restore the SAL state
+1:
+
+	mov		b0=r12			// SAL_CHECK return address
+
+	br		b0
+
+//EndMain//////////////////////////////////////////////////////////////////////
+
+//StartMain////////////////////////////////////////////////////////////////////
+
+//
+// NOP init handler for kdump.  In panic situation, we may receive INIT
+// while kernel transition.  Since we initialize registers on leave from
+// current kernel, no longer monarch/slave handlers of current kernel in
+// virtual mode are called safely.
+// We can unregister these init handlers from SAL, however then the INIT
+// will result in warmboot by SAL and we cannot retrieve the crashdump.
+// Therefore register this NOP function to SAL, to prevent entering virtual
+// mode and resulting warmboot by SAL.
+//
+ia64_os_init_on_kdump:
+	mov		r8=r0		// IA64_INIT_RESUME
+	mov             r9=r10		// SAL_GP
+	mov		r22=r17		// *minstate
+	;;
+	mov		r10=r0		// return to same context
+	mov		b0=r12		// SAL_CHECK return address
+	br		b0
+
+//
+// SAL to OS entry point for INIT on all processors.  This has been defined for
+// registration purposes with SAL as a part of ia64_mca_init.  Monarch and
+// slave INIT have identical processing, except for the value of the
+// sos->monarch flag in r19.
+//
+
+ia64_os_init_dispatch_monarch:
+	mov r19=1				// Bow, bow, ye lower middle classes!
+	br.sptk ia64_os_init_dispatch
+
+ia64_os_init_dispatch_slave:
+	mov r19=0				// <igor>yeth, mathter</igor>
+
+ia64_os_init_dispatch:
+
+	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_state_save			// save the state that is not in minstate
+1:
+
+	// switch to per cpu INIT stack
+	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_new_stack
+1:
+
+	// everything saved, now we can set the kernel registers
+	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_set_kernel_registers
+1:
+
+	// This must be done in physical mode
+	GET_IA64_MCA_DATA(r2)
+	;;
+	mov r7=r2
+
+        // Enter virtual mode from physical mode
+	VIRTUAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_begin, r4)
+
+	// This code returns to SAL via SOS r2, in general SAL has no unwind
+	// data.  To get a clean termination when backtracing the C MCA/INIT
+	// handler, set a dummy return address of 0 in this routine.  That
+	// requires that ia64_os_init_virtual_begin be a global function.
+ENTRY(ia64_os_init_virtual_begin)
+	.prologue
+	.save rp,r0
+	.body
+
+	mov ar.rsc=3				// set eager mode for C handler
+	mov r2=r7				// see GET_IA64_MCA_DATA above
+	;;
+
+	// Call virtual mode handler
+	alloc r14=ar.pfs,0,0,3,0
+	;;
+	DATA_PA_TO_VA(r2,r7)
+	;;
+	add out0=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
+	add out1=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
+	add out2=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SOS_OFFSET, r2
+	br.call.sptk.many    b0=ia64_init_handler
+
+	// Revert back to physical mode before going back to SAL
+	PHYSICAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_end, r4)
+ia64_os_init_virtual_end:
+
+END(ia64_os_init_virtual_begin)
+
+	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_state_restore		// restore the SAL state
+1:
+
+	// switch back to previous stack
+	alloc r14=ar.pfs,0,0,0,0		// remove the INIT handler frame
+	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
+	LOAD_PHYSICAL(p0,r2,1f)			// return address
+	br.sptk ia64_old_stack
+1:
+
+	mov		b0=r12			// SAL_CHECK return address
+	br		b0
+
+//EndMain//////////////////////////////////////////////////////////////////////
+
+// common defines for the stubs
+#define	ms		r4
+#define	regs		r5
+#define	temp1		r2	/* careful, it overlaps with input registers */
+#define	temp2		r3	/* careful, it overlaps with input registers */
+#define	temp3		r7
+#define	temp4		r14
+
+
+//++
+// Name:
+//	ia64_state_save()
+//
+// Stub Description:
+//
+//	Save the state that is not in minstate.  This is sensitive to the layout of
+//	struct ia64_sal_os_state in mca.h.
+//
+//	r2 contains the return address, r3 contains either
+//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
+//
+//	The OS to SAL section of struct ia64_sal_os_state is set to a default
+//	value of cold boot (MCA) or warm boot (INIT) and return to the same
+//	context.  ia64_sal_os_state is also used to hold some registers that
+//	need to be saved and restored across the stack switches.
+//
+//	Most input registers to this stub come from PAL/SAL
+//	r1  os gp, physical
+//	r8  pal_proc entry point
+//	r9  sal_proc entry point
+//	r10 sal gp
+//	r11 MCA - rendevzous state, INIT - reason code
+//	r12 sal return address
+//	r17 pal min_state
+//	r18 processor state parameter
+//	r19 monarch flag, set by the caller of this routine
+//
+//	In addition to the SAL to OS state, this routine saves all the
+//	registers that appear in struct pt_regs and struct switch_stack,
+//	excluding those that are already in the PAL minstate area.  This
+//	results in a partial pt_regs and switch_stack, the C code copies the
+//	remaining registers from PAL minstate to pt_regs and switch_stack.  The
+//	resulting structures contain all the state of the original process when
+//	MCA/INIT occurred.
+//
+//--
+
+ia64_state_save:
+	add regs=MCA_SOS_OFFSET, r3
+	add ms=MCA_SOS_OFFSET+8, r3
+	mov b0=r2		// save return address
+	cmp.eq p1,p2=IA64_MCA_CPU_MCA_STACK_OFFSET, r3
+	;;
+	GET_IA64_MCA_DATA(temp2)
+	;;
+	add temp1=temp2, regs	// struct ia64_sal_os_state on MCA or INIT stack
+	add temp2=temp2, ms	// struct ia64_sal_os_state+8 on MCA or INIT stack
+	;;
+	mov regs=temp1		// save the start of sos
+	st8 [temp1]=r1,16	// os_gp
+	st8 [temp2]=r8,16	// pal_proc
+	;;
+	st8 [temp1]=r9,16	// sal_proc
+	st8 [temp2]=r11,16	// rv_rc
+	mov r11=cr.iipa
+	;;
+	st8 [temp1]=r18		// proc_state_param
+	st8 [temp2]=r19		// monarch
+	mov r6=IA64_KR(CURRENT)
+	add temp1=SOS(SAL_RA), regs
+	add temp2=SOS(SAL_GP), regs
+	;;
+	st8 [temp1]=r12,16	// sal_ra
+	st8 [temp2]=r10,16	// sal_gp
+	mov r12=cr.isr
+	;;
+	st8 [temp1]=r17,16	// pal_min_state
+	st8 [temp2]=r6,16	// prev_IA64_KR_CURRENT
+	mov r6=IA64_KR(CURRENT_STACK)
+	;;
+	st8 [temp1]=r6,16	// prev_IA64_KR_CURRENT_STACK
+	st8 [temp2]=r0,16	// prev_task, starts off as NULL
+	mov r6=cr.ifa
+	;;
+	st8 [temp1]=r12,16	// cr.isr
+	st8 [temp2]=r6,16	// cr.ifa
+	mov r12=cr.itir
+	;;
+	st8 [temp1]=r12,16	// cr.itir
+	st8 [temp2]=r11,16	// cr.iipa
+	mov r12=cr.iim
+	;;
+	st8 [temp1]=r12		// cr.iim
+(p1)	mov r12=IA64_MCA_COLD_BOOT
+(p2)	mov r12=IA64_INIT_WARM_BOOT
+	mov r6=cr.iha
+	add temp1=SOS(OS_STATUS), regs
+	;;
+	st8 [temp2]=r6		// cr.iha
+	add temp2=SOS(CONTEXT), regs
+	st8 [temp1]=r12		// os_status, default is cold boot
+	mov r6=IA64_MCA_SAME_CONTEXT
+	;;
+	st8 [temp2]=r6		// context, default is same context
+
+	// Save the pt_regs data that is not in minstate.  The previous code
+	// left regs at sos.
+	add regs=MCA_PT_REGS_OFFSET-MCA_SOS_OFFSET, regs
+	;;
+	add temp1=PT(B6), regs
+	mov temp3=b6
+	mov temp4=b7
+	add temp2=PT(B7), regs
+	;;
+	st8 [temp1]=temp3,PT(AR_CSD)-PT(B6)		// save b6
+	st8 [temp2]=temp4,PT(AR_SSD)-PT(B7)		// save b7
+	mov temp3=ar.csd
+	mov temp4=ar.ssd
+	cover						// must be last in group
+	;;
+	st8 [temp1]=temp3,PT(AR_UNAT)-PT(AR_CSD)	// save ar.csd
+	st8 [temp2]=temp4,PT(AR_PFS)-PT(AR_SSD)		// save ar.ssd
+	mov temp3=ar.unat
+	mov temp4=ar.pfs
+	;;
+	st8 [temp1]=temp3,PT(AR_RNAT)-PT(AR_UNAT)	// save ar.unat
+	st8 [temp2]=temp4,PT(AR_BSPSTORE)-PT(AR_PFS)	// save ar.pfs
+	mov temp3=ar.rnat
+	mov temp4=ar.bspstore
+	;;
+	st8 [temp1]=temp3,PT(LOADRS)-PT(AR_RNAT)	// save ar.rnat
+	st8 [temp2]=temp4,PT(AR_FPSR)-PT(AR_BSPSTORE)	// save ar.bspstore
+	mov temp3=ar.bsp
+	;;
+	sub temp3=temp3, temp4	// ar.bsp - ar.bspstore
+	mov temp4=ar.fpsr
+	;;
+	shl temp3=temp3,16	// compute ar.rsc to be used for "loadrs"
+	;;
+	st8 [temp1]=temp3,PT(AR_CCV)-PT(LOADRS)		// save loadrs
+	st8 [temp2]=temp4,PT(F6)-PT(AR_FPSR)		// save ar.fpsr
+	mov temp3=ar.ccv
+	;;
+	st8 [temp1]=temp3,PT(F7)-PT(AR_CCV)		// save ar.ccv
+	stf.spill [temp2]=f6,PT(F8)-PT(F6)
+	;;
+	stf.spill [temp1]=f7,PT(F9)-PT(F7)
+	stf.spill [temp2]=f8,PT(F10)-PT(F8)
+	;;
+	stf.spill [temp1]=f9,PT(F11)-PT(F9)
+	stf.spill [temp2]=f10
+	;;
+	stf.spill [temp1]=f11
+
+	// Save the switch_stack data that is not in minstate nor pt_regs.  The
+	// previous code left regs at pt_regs.
+	add regs=MCA_SWITCH_STACK_OFFSET-MCA_PT_REGS_OFFSET, regs
+	;;
+	add temp1=SW(F2), regs
+	add temp2=SW(F3), regs
+	;;
+	stf.spill [temp1]=f2,32
+	stf.spill [temp2]=f3,32
+	;;
+	stf.spill [temp1]=f4,32
+	stf.spill [temp2]=f5,32
+	;;
+	stf.spill [temp1]=f12,32
+	stf.spill [temp2]=f13,32
+	;;
+	stf.spill [temp1]=f14,32
+	stf.spill [temp2]=f15,32
+	;;
+	stf.spill [temp1]=f16,32
+	stf.spill [temp2]=f17,32
+	;;
+	stf.spill [temp1]=f18,32
+	stf.spill [temp2]=f19,32
+	;;
+	stf.spill [temp1]=f20,32
+	stf.spill [temp2]=f21,32
+	;;
+	stf.spill [temp1]=f22,32
+	stf.spill [temp2]=f23,32
+	;;
+	stf.spill [temp1]=f24,32
+	stf.spill [temp2]=f25,32
+	;;
+	stf.spill [temp1]=f26,32
+	stf.spill [temp2]=f27,32
+	;;
+	stf.spill [temp1]=f28,32
+	stf.spill [temp2]=f29,32
+	;;
+	stf.spill [temp1]=f30,SW(B2)-SW(F30)
+	stf.spill [temp2]=f31,SW(B3)-SW(F31)
+	mov temp3=b2
+	mov temp4=b3
+	;;
+	st8 [temp1]=temp3,16	// save b2
+	st8 [temp2]=temp4,16	// save b3
+	mov temp3=b4
+	mov temp4=b5
+	;;
+	st8 [temp1]=temp3,SW(AR_LC)-SW(B4)	// save b4
+	st8 [temp2]=temp4	// save b5
+	mov temp3=ar.lc
+	;;
+	st8 [temp1]=temp3	// save ar.lc
+
+	// FIXME: Some proms are incorrectly accessing the minstate area as
+	// cached data.  The C code uses region 6, uncached virtual.  Ensure
+	// that there is no cache data lying around for the first 1K of the
+	// minstate area.
+	// Remove this code in September 2006, that gives platforms a year to
+	// fix their proms and get their customers updated.
+
+	add r1=32*1,r17
+	add r2=32*2,r17
+	add r3=32*3,r17
+	add r4=32*4,r17
+	add r5=32*5,r17
+	add r6=32*6,r17
+	add r7=32*7,r17
+	;;
+	fc r17
+	fc r1
+	fc r2
+	fc r3
+	fc r4
+	fc r5
+	fc r6
+	fc r7
+	add r17=32*8,r17
+	add r1=32*8,r1
+	add r2=32*8,r2
+	add r3=32*8,r3
+	add r4=32*8,r4
+	add r5=32*8,r5
+	add r6=32*8,r6
+	add r7=32*8,r7
+	;;
+	fc r17
+	fc r1
+	fc r2
+	fc r3
+	fc r4
+	fc r5
+	fc r6
+	fc r7
+	add r17=32*8,r17
+	add r1=32*8,r1
+	add r2=32*8,r2
+	add r3=32*8,r3
+	add r4=32*8,r4
+	add r5=32*8,r5
+	add r6=32*8,r6
+	add r7=32*8,r7
+	;;
+	fc r17
+	fc r1
+	fc r2
+	fc r3
+	fc r4
+	fc r5
+	fc r6
+	fc r7
+	add r17=32*8,r17
+	add r1=32*8,r1
+	add r2=32*8,r2
+	add r3=32*8,r3
+	add r4=32*8,r4
+	add r5=32*8,r5
+	add r6=32*8,r6
+	add r7=32*8,r7
+	;;
+	fc r17
+	fc r1
+	fc r2
+	fc r3
+	fc r4
+	fc r5
+	fc r6
+	fc r7
+
+	br.sptk b0
+
+//EndStub//////////////////////////////////////////////////////////////////////
+
+
+//++
+// Name:
+//	ia64_state_restore()
+//
+// Stub Description:
+//
+//	Restore the SAL/OS state.  This is sensitive to the layout of struct
+//	ia64_sal_os_state in mca.h.
+//
+//	r2 contains the return address, r3 contains either
+//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
+//
+//	In addition to the SAL to OS state, this routine restores all the
+//	registers that appear in struct pt_regs and struct switch_stack,
+//	excluding those in the PAL minstate area.
+//
+//--
+
+ia64_state_restore:
+	// Restore the switch_stack data that is not in minstate nor pt_regs.
+	add regs=MCA_SWITCH_STACK_OFFSET, r3
+	mov b0=r2		// save return address
+	;;
+	GET_IA64_MCA_DATA(temp2)
+	;;
+	add regs=temp2, regs
+	;;
+	add temp1=SW(F2), regs
+	add temp2=SW(F3), regs
+	;;
+	ldf.fill f2=[temp1],32
+	ldf.fill f3=[temp2],32
+	;;
+	ldf.fill f4=[temp1],32
+	ldf.fill f5=[temp2],32
+	;;
+	ldf.fill f12=[temp1],32
+	ldf.fill f13=[temp2],32
+	;;
+	ldf.fill f14=[temp1],32
+	ldf.fill f15=[temp2],32
+	;;
+	ldf.fill f16=[temp1],32
+	ldf.fill f17=[temp2],32
+	;;
+	ldf.fill f18=[temp1],32
+	ldf.fill f19=[temp2],32
+	;;
+	ldf.fill f20=[temp1],32
+	ldf.fill f21=[temp2],32
+	;;
+	ldf.fill f22=[temp1],32
+	ldf.fill f23=[temp2],32
+	;;
+	ldf.fill f24=[temp1],32
+	ldf.fill f25=[temp2],32
+	;;
+	ldf.fill f26=[temp1],32
+	ldf.fill f27=[temp2],32
+	;;
+	ldf.fill f28=[temp1],32
+	ldf.fill f29=[temp2],32
+	;;
+	ldf.fill f30=[temp1],SW(B2)-SW(F30)
+	ldf.fill f31=[temp2],SW(B3)-SW(F31)
+	;;
+	ld8 temp3=[temp1],16	// restore b2
+	ld8 temp4=[temp2],16	// restore b3
+	;;
+	mov b2=temp3
+	mov b3=temp4
+	ld8 temp3=[temp1],SW(AR_LC)-SW(B4)	// restore b4
+	ld8 temp4=[temp2]	// restore b5
+	;;
+	mov b4=temp3
+	mov b5=temp4
+	ld8 temp3=[temp1]	// restore ar.lc
+	;;
+	mov ar.lc=temp3
+
+	// Restore the pt_regs data that is not in minstate.  The previous code
+	// left regs at switch_stack.
+	add regs=MCA_PT_REGS_OFFSET-MCA_SWITCH_STACK_OFFSET, regs
+	;;
+	add temp1=PT(B6), regs
+	add temp2=PT(B7), regs
+	;;
+	ld8 temp3=[temp1],PT(AR_CSD)-PT(B6)		// restore b6
+	ld8 temp4=[temp2],PT(AR_SSD)-PT(B7)		// restore b7
+	;;
+	mov b6=temp3
+	mov b7=temp4
+	ld8 temp3=[temp1],PT(AR_UNAT)-PT(AR_CSD)	// restore ar.csd
+	ld8 temp4=[temp2],PT(AR_PFS)-PT(AR_SSD)		// restore ar.ssd
+	;;
+	mov ar.csd=temp3
+	mov ar.ssd=temp4
+	ld8 temp3=[temp1]				// restore ar.unat
+	add temp1=PT(AR_CCV)-PT(AR_UNAT), temp1
+	ld8 temp4=[temp2],PT(AR_FPSR)-PT(AR_PFS)	// restore ar.pfs
+	;;
+	mov ar.unat=temp3
+	mov ar.pfs=temp4
+	// ar.rnat, ar.bspstore, loadrs are restore in ia64_old_stack.
+	ld8 temp3=[temp1],PT(F6)-PT(AR_CCV)		// restore ar.ccv
+	ld8 temp4=[temp2],PT(F7)-PT(AR_FPSR)		// restore ar.fpsr
+	;;
+	mov ar.ccv=temp3
+	mov ar.fpsr=temp4
+	ldf.fill f6=[temp1],PT(F8)-PT(F6)
+	ldf.fill f7=[temp2],PT(F9)-PT(F7)
+	;;
+	ldf.fill f8=[temp1],PT(F10)-PT(F8)
+	ldf.fill f9=[temp2],PT(F11)-PT(F9)
+	;;
+	ldf.fill f10=[temp1]
+	ldf.fill f11=[temp2]
+
+	// Restore the SAL to OS state. The previous code left regs at pt_regs.
+	add regs=MCA_SOS_OFFSET-MCA_PT_REGS_OFFSET, regs
+	;;
+	add temp1=SOS(SAL_RA), regs
+	add temp2=SOS(SAL_GP), regs
+	;;
+	ld8 r12=[temp1],16	// sal_ra
+	ld8 r9=[temp2],16	// sal_gp
+	;;
+	ld8 r22=[temp1],16	// pal_min_state, virtual
+	ld8 r13=[temp2],16	// prev_IA64_KR_CURRENT
+	;;
+	ld8 r16=[temp1],16	// prev_IA64_KR_CURRENT_STACK
+	ld8 r20=[temp2],16	// prev_task
+	;;
+	ld8 temp3=[temp1],16	// cr.isr
+	ld8 temp4=[temp2],16	// cr.ifa
+	;;
+	mov cr.isr=temp3
+	mov cr.ifa=temp4
+	ld8 temp3=[temp1],16	// cr.itir
+	ld8 temp4=[temp2],16	// cr.iipa
+	;;
+	mov cr.itir=temp3
+	mov cr.iipa=temp4
+	ld8 temp3=[temp1]	// cr.iim
+	ld8 temp4=[temp2]		// cr.iha
+	add temp1=SOS(OS_STATUS), regs
+	add temp2=SOS(CONTEXT), regs
+	;;
+	mov cr.iim=temp3
+	mov cr.iha=temp4
+	dep r22=0,r22,62,1	// pal_min_state, physical, uncached
+	mov IA64_KR(CURRENT)=r13
+	ld8 r8=[temp1]		// os_status
+	ld8 r10=[temp2]		// context
+
+	/* Wire IA64_TR_CURRENT_STACK to the stack that we are resuming to.  To
+	 * avoid any dependencies on the algorithm in ia64_switch_to(), just
+	 * purge any existing CURRENT_STACK mapping and insert the new one.
+	 *
+	 * r16 contains prev_IA64_KR_CURRENT_STACK, r13 contains
+	 * prev_IA64_KR_CURRENT, these values may have been changed by the C
+	 * code.  Do not use r8, r9, r10, r22, they contain values ready for
+	 * the return to SAL.
+	 */
+
+	mov r15=IA64_KR(CURRENT_STACK)		// physical granule mapped by IA64_TR_CURRENT_STACK
+	;;
+	shl r15=r15,IA64_GRANULE_SHIFT
+	;;
+	dep r15=-1,r15,61,3			// virtual granule
+	mov r18=IA64_GRANULE_SHIFT<<2		// for cr.itir.ps
+	;;
+	ptr.d r15,r18
+	;;
+	srlz.d
+
+	extr.u r19=r13,61,3			// r13 = prev_IA64_KR_CURRENT
+	shl r20=r16,IA64_GRANULE_SHIFT		// r16 = prev_IA64_KR_CURRENT_STACK
+	movl r21=PAGE_KERNEL			// page properties
+	;;
+	mov IA64_KR(CURRENT_STACK)=r16
+	cmp.ne p6,p0=RGN_KERNEL,r19		// new stack is in the kernel region?
+	or r21=r20,r21				// construct PA | page properties
+(p6)	br.spnt 1f				// the dreaded cpu 0 idle task in region 5:(
+	;;
+	mov cr.itir=r18
+	mov cr.ifa=r13
+	mov r20=IA64_TR_CURRENT_STACK
+	;;
+	itr.d dtr[r20]=r21
+	;;
+	srlz.d
+1:
+
+	br.sptk b0
+
+//EndStub//////////////////////////////////////////////////////////////////////
+
+
+//++
+// Name:
+//	ia64_new_stack()
+//
+// Stub Description:
+//
+//	Switch to the MCA/INIT stack.
+//
+//	r2 contains the return address, r3 contains either
+//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
+//
+//	On entry RBS is still on the original stack, this routine switches RBS
+//	to use the MCA/INIT stack.
+//
+//	On entry, sos->pal_min_state is physical, on exit it is virtual.
+//
+//--
+
+ia64_new_stack:
+	add regs=MCA_PT_REGS_OFFSET, r3
+	add temp2=MCA_SOS_OFFSET+SOS(PAL_MIN_STATE), r3
+	mov b0=r2			// save return address
+	GET_IA64_MCA_DATA(temp1)
+	invala
+	;;
+	add temp2=temp2, temp1		// struct ia64_sal_os_state.pal_min_state on MCA or INIT stack
+	add regs=regs, temp1		// struct pt_regs on MCA or INIT stack
+	;;
+	// Address of minstate area provided by PAL is physical, uncacheable.
+	// Convert to Linux virtual address in region 6 for C code.
+	ld8 ms=[temp2]			// pal_min_state, physical
+	;;
+	dep temp1=-1,ms,62,2		// set region 6
+	mov temp3=IA64_RBS_OFFSET-MCA_PT_REGS_OFFSET
+	;;
+	st8 [temp2]=temp1		// pal_min_state, virtual
+
+	add temp4=temp3, regs		// start of bspstore on new stack
+	;;
+	mov ar.bspstore=temp4		// switch RBS to MCA/INIT stack
+	;;
+	flushrs				// must be first in group
+	br.sptk b0
+
+//EndStub//////////////////////////////////////////////////////////////////////
+
+
+//++
+// Name:
+//	ia64_old_stack()
+//
+// Stub Description:
+//
+//	Switch to the old stack.
+//
+//	r2 contains the return address, r3 contains either
+//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
+//
+//	On entry, pal_min_state is virtual, on exit it is physical.
+//
+//	On entry RBS is on the MCA/INIT stack, this routine switches RBS
+//	back to the previous stack.
+//
+//	The psr is set to all zeroes.  SAL return requires either all zeroes or
+//	just psr.mc set.  Leaving psr.mc off allows INIT to be issued if this
+//	code does not perform correctly.
+//
+//	The dirty registers at the time of the event were flushed to the
+//	MCA/INIT stack in ia64_pt_regs_save().  Restore the dirty registers
+//	before reverting to the previous bspstore.
+//--
+
+ia64_old_stack:
+	add regs=MCA_PT_REGS_OFFSET, r3
+	mov b0=r2			// save return address
+	GET_IA64_MCA_DATA(temp2)
+	LOAD_PHYSICAL(p0,temp1,1f)
+	;;
+	mov cr.ipsr=r0
+	mov cr.ifs=r0
+	mov cr.iip=temp1
+	;;
+	invala
+	rfi
+1:
+
+	add regs=regs, temp2		// struct pt_regs on MCA or INIT stack
+	;;
+	add temp1=PT(LOADRS), regs
+	;;
+	ld8 temp2=[temp1],PT(AR_BSPSTORE)-PT(LOADRS)	// restore loadrs
+	;;
+	ld8 temp3=[temp1],PT(AR_RNAT)-PT(AR_BSPSTORE)	// restore ar.bspstore
+	mov ar.rsc=temp2
+	;;
+	loadrs
+	ld8 temp4=[temp1]		// restore ar.rnat
+	;;
+	mov ar.bspstore=temp3		// back to old stack
+	;;
+	mov ar.rnat=temp4
+	;;
+
+	br.sptk b0
+
+//EndStub//////////////////////////////////////////////////////////////////////
+
+
+//++
+// Name:
+//	ia64_set_kernel_registers()
+//
+// Stub Description:
+//
+//	Set the registers that are required by the C code in order to run on an
+//	MCA/INIT stack.
+//
+//	r2 contains the return address, r3 contains either
+//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
+//
+//--
+
+ia64_set_kernel_registers:
+	add temp3=MCA_SP_OFFSET, r3
+	mov b0=r2		// save return address
+	GET_IA64_MCA_DATA(temp1)
+	;;
+	add r12=temp1, temp3	// kernel stack pointer on MCA/INIT stack
+	add r13=temp1, r3	// set current to start of MCA/INIT stack
+	add r20=temp1, r3	// physical start of MCA/INIT stack
+	;;
+	DATA_PA_TO_VA(r12,temp2)
+	DATA_PA_TO_VA(r13,temp3)
+	;;
+	mov IA64_KR(CURRENT)=r13
+
+	/* Wire IA64_TR_CURRENT_STACK to the MCA/INIT handler stack.  To avoid
+	 * any dependencies on the algorithm in ia64_switch_to(), just purge
+	 * any existing CURRENT_STACK mapping and insert the new one.
+	 */
+
+	mov r16=IA64_KR(CURRENT_STACK)		// physical granule mapped by IA64_TR_CURRENT_STACK
+	;;
+	shl r16=r16,IA64_GRANULE_SHIFT
+	;;
+	dep r16=-1,r16,61,3			// virtual granule
+	mov r18=IA64_GRANULE_SHIFT<<2		// for cr.itir.ps
+	;;
+	ptr.d r16,r18
+	;;
+	srlz.d
+
+	shr.u r16=r20,IA64_GRANULE_SHIFT	// r20 = physical start of MCA/INIT stack
+	movl r21=PAGE_KERNEL			// page properties
+	;;
+	mov IA64_KR(CURRENT_STACK)=r16
+	or r21=r20,r21				// construct PA | page properties
+	;;
+	mov cr.itir=r18
+	mov cr.ifa=r13
+	mov r20=IA64_TR_CURRENT_STACK
+
+	movl r17=FPSR_DEFAULT
+	;;
+	mov.m ar.fpsr=r17			// set ar.fpsr to kernel default value
+	;;
+	itr.d dtr[r20]=r21
+	;;
+	srlz.d
+
+	br.sptk b0
+
+//EndStub//////////////////////////////////////////////////////////////////////
+
+#undef	ms
+#undef	regs
+#undef	temp1
+#undef	temp2
+#undef	temp3
+#undef	temp4
+
+
+// Support function for mca.c, it is here to avoid using inline asm.  Given the
+// address of an rnat slot, if that address is below the current ar.bspstore
+// then return the contents of that slot, otherwise return the contents of
+// ar.rnat.
+GLOBAL_ENTRY(ia64_get_rnat)
+	alloc r14=ar.pfs,1,0,0,0
+	mov ar.rsc=0
+	;;
+	mov r14=ar.bspstore
+	;;
+	cmp.lt p6,p7=in0,r14
+	;;
+(p6)	ld8 r8=[in0]
+(p7)	mov r8=ar.rnat
+	mov ar.rsc=3
+	br.ret.sptk.many rp
+END(ia64_get_rnat)
+
+
+// void ia64_set_psr_mc(void)
+//
+// Set psr.mc bit to mask MCA/INIT.
+GLOBAL_ENTRY(ia64_set_psr_mc)
+	rsm psr.i | psr.ic		// disable interrupts
+	;;
+	srlz.d
+	;;
+	mov r14 = psr			// get psr{36:35,31:0}
+	movl r15 = 1f
+	;;
+	dep r14 = -1, r14, PSR_MC, 1	// set psr.mc
+	;;
+	dep r14 = -1, r14, PSR_IC, 1	// set psr.ic
+	;;
+	dep r14 = -1, r14, PSR_BN, 1	// keep bank1 in use
+	;;
+	mov cr.ipsr = r14
+	mov cr.ifs = r0
+	mov cr.iip = r15
+	;;
+	rfi
+1:
+	br.ret.sptk.many rp
+END(ia64_set_psr_mc)
diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
new file mode 100644
index 000000000..23c203639
--- /dev/null
+++ b/arch/ia64/kernel/mca_drv.c
@@ -0,0 +1,796 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * File:	mca_drv.c
+ * Purpose:	Generic MCA handling layer
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * Copyright (C) 2004 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
+ * Copyright (C) 2005 Silicon Graphics, Inc
+ * Copyright (C) 2005 Keith Owens <kaos@sgi.com>
+ * Copyright (C) 2006 Russ Anderson <rja@sgi.com>
+ */
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kallsyms.h>
+#include <linux/memblock.h>
+#include <linux/acpi.h>
+#include <linux/timer.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/workqueue.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include <asm/delay.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/sal.h>
+#include <asm/mca.h>
+
+#include <asm/irq.h>
+#include <asm/hw_irq.h>
+
+#include "mca_drv.h"
+
+/* max size of SAL error record (default) */
+static int sal_rec_max = 10000;
+
+/* from mca_drv_asm.S */
+extern void *mca_handler_bhhook(void);
+
+static DEFINE_SPINLOCK(mca_bh_lock);
+
+typedef enum {
+	MCA_IS_LOCAL  = 0,
+	MCA_IS_GLOBAL = 1
+} mca_type_t;
+
+#define MAX_PAGE_ISOLATE 1024
+
+static struct page *page_isolate[MAX_PAGE_ISOLATE];
+static int num_page_isolate = 0;
+
+typedef enum {
+	ISOLATE_NG,
+	ISOLATE_OK,
+	ISOLATE_NONE
+} isolate_status_t;
+
+typedef enum {
+	MCA_NOT_RECOVERED = 0,
+	MCA_RECOVERED	  = 1
+} recovery_status_t;
+
+/*
+ *  This pool keeps pointers to the section part of SAL error record
+ */
+static struct {
+	slidx_list_t *buffer; /* section pointer list pool */
+	int	     cur_idx; /* Current index of section pointer list pool */
+	int	     max_idx; /* Maximum index of section pointer list pool */
+} slidx_pool;
+
+static int
+fatal_mca(const char *fmt, ...)
+{
+	va_list args;
+	char buf[256];
+
+	va_start(args, fmt);
+	vsnprintf(buf, sizeof(buf), fmt, args);
+	va_end(args);
+	ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf);
+
+	return MCA_NOT_RECOVERED;
+}
+
+static int
+mca_recovered(const char *fmt, ...)
+{
+	va_list args;
+	char buf[256];
+
+	va_start(args, fmt);
+	vsnprintf(buf, sizeof(buf), fmt, args);
+	va_end(args);
+	ia64_mca_printk(KERN_INFO "MCA: %s\n", buf);
+
+	return MCA_RECOVERED;
+}
+
+/**
+ * mca_page_isolate - isolate a poisoned page in order not to use it later
+ * @paddr:	poisoned memory location
+ *
+ * Return value:
+ *	one of isolate_status_t, ISOLATE_OK/NG/NONE.
+ */
+
+static isolate_status_t
+mca_page_isolate(unsigned long paddr)
+{
+	int i;
+	struct page *p;
+
+	/* whether physical address is valid or not */
+	if (!ia64_phys_addr_valid(paddr))
+		return ISOLATE_NONE;
+
+	if (!pfn_valid(paddr >> PAGE_SHIFT))
+		return ISOLATE_NONE;
+
+	/* convert physical address to physical page number */
+	p = pfn_to_page(paddr>>PAGE_SHIFT);
+
+	/* check whether a page number have been already registered or not */
+	for (i = 0; i < num_page_isolate; i++)
+		if (page_isolate[i] == p)
+			return ISOLATE_OK; /* already listed */
+
+	/* limitation check */
+	if (num_page_isolate == MAX_PAGE_ISOLATE)
+		return ISOLATE_NG;
+
+	/* kick pages having attribute 'SLAB' or 'Reserved' */
+	if (PageSlab(p) || PageReserved(p))
+		return ISOLATE_NG;
+
+	/* add attribute 'Reserved' and register the page */
+	get_page(p);
+	SetPageReserved(p);
+	page_isolate[num_page_isolate++] = p;
+
+	return ISOLATE_OK;
+}
+
+/**
+ * mca_hanlder_bh - Kill the process which occurred memory read error
+ * @paddr:	poisoned address received from MCA Handler
+ */
+
+void
+mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)
+{
+	ia64_mlogbuf_dump();
+	printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, "
+		"iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n",
+	       raw_smp_processor_id(), current->pid,
+		from_kuid(&init_user_ns, current_uid()),
+		iip, ipsr, paddr, current->comm);
+
+	spin_lock(&mca_bh_lock);
+	switch (mca_page_isolate(paddr)) {
+	case ISOLATE_OK:
+		printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
+		break;
+	case ISOLATE_NG:
+		printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr);
+		break;
+	default:
+		break;
+	}
+	spin_unlock(&mca_bh_lock);
+
+	/* This process is about to be killed itself */
+	make_task_dead(SIGKILL);
+}
+
+/**
+ * mca_make_peidx - Make index of processor error section
+ * @slpi:	pointer to record of processor error section
+ * @peidx:	pointer to index of processor error section
+ */
+
+static void
+mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx)
+{
+	/*
+	 * calculate the start address of
+	 *   "struct cpuid_info" and "sal_processor_static_info_t".
+	 */
+	u64 total_check_num = slpi->valid.num_cache_check
+				+ slpi->valid.num_tlb_check
+				+ slpi->valid.num_bus_check
+				+ slpi->valid.num_reg_file_check
+				+ slpi->valid.num_ms_check;
+	u64 head_size =	sizeof(sal_log_mod_error_info_t) * total_check_num
+			+ sizeof(sal_log_processor_info_t);
+	u64 mid_size  = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info);
+
+	peidx_head(peidx)   = slpi;
+	peidx_mid(peidx)    = (struct sal_cpuid_info *)
+		(slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL);
+	peidx_bottom(peidx) = (sal_processor_static_info_t *)
+		(slpi->valid.psi_static_struct ?
+			((char*)slpi + head_size + mid_size) : NULL);
+}
+
+/**
+ * mca_make_slidx -  Make index of SAL error record
+ * @buffer:	pointer to SAL error record
+ * @slidx:	pointer to index of SAL error record
+ *
+ * Return value:
+ *	1 if record has platform error / 0 if not
+ */
+#define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \
+	{slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \
+	hl->hdr = ptr; \
+	list_add(&hl->list, &(sect)); \
+	slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; }
+
+static int
+mca_make_slidx(void *buffer, slidx_table_t *slidx)
+{
+	int platform_err = 0;
+	int record_len = ((sal_log_record_header_t*)buffer)->len;
+	u32 ercd_pos;
+	int sects;
+	sal_log_section_hdr_t *sp;
+
+	/*
+	 * Initialize index referring current record
+	 */
+	INIT_LIST_HEAD(&(slidx->proc_err));
+	INIT_LIST_HEAD(&(slidx->mem_dev_err));
+	INIT_LIST_HEAD(&(slidx->sel_dev_err));
+	INIT_LIST_HEAD(&(slidx->pci_bus_err));
+	INIT_LIST_HEAD(&(slidx->smbios_dev_err));
+	INIT_LIST_HEAD(&(slidx->pci_comp_err));
+	INIT_LIST_HEAD(&(slidx->plat_specific_err));
+	INIT_LIST_HEAD(&(slidx->host_ctlr_err));
+	INIT_LIST_HEAD(&(slidx->plat_bus_err));
+	INIT_LIST_HEAD(&(slidx->unsupported));
+
+	/*
+	 * Extract a Record Header
+	 */
+	slidx->header = buffer;
+
+	/*
+	 * Extract each section records
+	 * (arranged from "int ia64_log_platform_info_print()")
+	 */
+	for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0;
+		ercd_pos < record_len; ercd_pos += sp->len, sects++) {
+		sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos);
+		if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) {
+			LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp);
+		} else if (!efi_guidcmp(sp->guid,
+				SAL_PLAT_BUS_ERR_SECT_GUID)) {
+			platform_err = 1;
+			LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp);
+		} else {
+			LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp);
+		}
+	}
+	slidx->n_sections = sects;
+
+	return platform_err;
+}
+
+/**
+ * init_record_index_pools - Initialize pool of lists for SAL record index
+ *
+ * Return value:
+ *	0 on Success / -ENOMEM on Failure
+ */
+static int
+init_record_index_pools(void)
+{
+	int i;
+	int rec_max_size;  /* Maximum size of SAL error records */
+	int sect_min_size; /* Minimum size of SAL error sections */
+	/* minimum size table of each section */
+	static int sal_log_sect_min_sizes[] = {
+		sizeof(sal_log_processor_info_t)
+		+ sizeof(sal_processor_static_info_t),
+		sizeof(sal_log_mem_dev_err_info_t),
+		sizeof(sal_log_sel_dev_err_info_t),
+		sizeof(sal_log_pci_bus_err_info_t),
+		sizeof(sal_log_smbios_dev_err_info_t),
+		sizeof(sal_log_pci_comp_err_info_t),
+		sizeof(sal_log_plat_specific_err_info_t),
+		sizeof(sal_log_host_ctlr_err_info_t),
+		sizeof(sal_log_plat_bus_err_info_t),
+	};
+
+	/*
+	 * MCA handler cannot allocate new memory on flight,
+	 * so we preallocate enough memory to handle a SAL record.
+	 *
+	 * Initialize a handling set of slidx_pool:
+	 *   1. Pick up the max size of SAL error records
+	 *   2. Pick up the min size of SAL error sections
+	 *   3. Allocate the pool as enough to 2 SAL records
+	 *     (now we can estimate the maxinum of section in a record.)
+	 */
+
+	/* - 1 - */
+	rec_max_size = sal_rec_max;
+
+	/* - 2 - */
+	sect_min_size = sal_log_sect_min_sizes[0];
+	for (i = 1; i < ARRAY_SIZE(sal_log_sect_min_sizes); i++)
+		if (sect_min_size > sal_log_sect_min_sizes[i])
+			sect_min_size = sal_log_sect_min_sizes[i];
+
+	/* - 3 - */
+	slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1;
+	slidx_pool.buffer =
+		kmalloc_array(slidx_pool.max_idx, sizeof(slidx_list_t),
+			      GFP_KERNEL);
+
+	return slidx_pool.buffer ? 0 : -ENOMEM;
+}
+
+
+/*****************************************************************************
+ * Recovery functions                                                        *
+ *****************************************************************************/
+
+/**
+ * is_mca_global - Check whether this MCA is global or not
+ * @peidx:	pointer of index of processor error section
+ * @pbci:	pointer to pal_bus_check_info_t
+ * @sos:	pointer to hand off struct between SAL and OS
+ *
+ * Return value:
+ *	MCA_IS_LOCAL / MCA_IS_GLOBAL
+ */
+
+static mca_type_t
+is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci,
+	      struct ia64_sal_os_state *sos)
+{
+	pal_processor_state_info_t *psp =
+		(pal_processor_state_info_t*)peidx_psp(peidx);
+
+	/*
+	 * PAL can request a rendezvous, if the MCA has a global scope.
+	 * If "rz_always" flag is set, SAL requests MCA rendezvous
+	 * in spite of global MCA.
+	 * Therefore it is local MCA when rendezvous has not been requested.
+	 * Failed to rendezvous, the system must be down.
+	 */
+	switch (sos->rv_rc) {
+		case -1: /* SAL rendezvous unsuccessful */
+			return MCA_IS_GLOBAL;
+		case  0: /* SAL rendezvous not required */
+			return MCA_IS_LOCAL;
+		case  1: /* SAL rendezvous successful int */
+		case  2: /* SAL rendezvous successful int with init */
+		default:
+			break;
+	}
+
+	/*
+	 * If One or more Cache/TLB/Reg_File/Uarch_Check is here,
+	 * it would be a local MCA. (i.e. processor internal error)
+	 */
+	if (psp->tc || psp->cc || psp->rc || psp->uc)
+		return MCA_IS_LOCAL;
+	
+	/*
+	 * Bus_Check structure with Bus_Check.ib (internal bus error) flag set
+	 * would be a global MCA. (e.g. a system bus address parity error)
+	 */
+	if (!pbci || pbci->ib)
+		return MCA_IS_GLOBAL;
+
+	/*
+	 * Bus_Check structure with Bus_Check.eb (external bus error) flag set
+	 * could be either a local MCA or a global MCA.
+	 *
+	 * Referring Bus_Check.bsi:
+	 *   0: Unknown/unclassified
+	 *   1: BERR#
+	 *   2: BINIT#
+	 *   3: Hard Fail
+	 * (FIXME: Are these SGI specific or generic bsi values?)
+	 */
+	if (pbci->eb)
+		switch (pbci->bsi) {
+			case 0:
+				/* e.g. a load from poisoned memory */
+				return MCA_IS_LOCAL;
+			case 1:
+			case 2:
+			case 3:
+				return MCA_IS_GLOBAL;
+		}
+
+	return MCA_IS_GLOBAL;
+}
+
+/**
+ * get_target_identifier - Get the valid Cache or Bus check target identifier.
+ * @peidx:	pointer of index of processor error section
+ *
+ * Return value:
+ *	target address on Success / 0 on Failure
+ */
+static u64
+get_target_identifier(peidx_table_t *peidx)
+{
+	u64 target_address = 0;
+	sal_log_mod_error_info_t *smei;
+	pal_cache_check_info_t *pcci;
+	int i, level = 9;
+
+	/*
+	 * Look through the cache checks for a valid target identifier
+	 * If more than one valid target identifier, return the one
+	 * with the lowest cache level.
+	 */
+	for (i = 0; i < peidx_cache_check_num(peidx); i++) {
+		smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i);
+		if (smei->valid.target_identifier && smei->target_identifier) {
+			pcci = (pal_cache_check_info_t *)&(smei->check_info);
+			if (!target_address || (pcci->level < level)) {
+				target_address = smei->target_identifier;
+				level = pcci->level;
+				continue;
+			}
+		}
+	}
+	if (target_address)
+		return target_address;
+
+	/*
+	 * Look at the bus check for a valid target identifier
+	 */
+	smei = peidx_bus_check(peidx, 0);
+	if (smei && smei->valid.target_identifier)
+		return smei->target_identifier;
+
+	return 0;
+}
+
+/**
+ * recover_from_read_error - Try to recover the errors which type are "read"s.
+ * @slidx:	pointer of index of SAL error record
+ * @peidx:	pointer of index of processor error section
+ * @pbci:	pointer of pal_bus_check_info
+ * @sos:	pointer to hand off struct between SAL and OS
+ *
+ * Return value:
+ *	1 on Success / 0 on Failure
+ */
+
+static int
+recover_from_read_error(slidx_table_t *slidx,
+			peidx_table_t *peidx, pal_bus_check_info_t *pbci,
+			struct ia64_sal_os_state *sos)
+{
+	u64 target_identifier;
+	struct pal_min_state_area *pmsa;
+	struct ia64_psr *psr1, *psr2;
+	ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook;
+
+	/* Is target address valid? */
+	target_identifier = get_target_identifier(peidx);
+	if (!target_identifier)
+		return fatal_mca("target address not valid");
+
+	/*
+	 * cpu read or memory-mapped io read
+	 *
+	 *    offending process  affected process  OS MCA do
+	 *     kernel mode        kernel mode       down system
+	 *     kernel mode        user   mode       kill the process
+	 *     user   mode        kernel mode       down system (*)
+	 *     user   mode        user   mode       kill the process
+	 *
+	 * (*) You could terminate offending user-mode process
+	 *    if (pbci->pv && pbci->pl != 0) *and* if you sure
+	 *    the process not have any locks of kernel.
+	 */
+
+	/* Is minstate valid? */
+	if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate))
+		return fatal_mca("minstate not valid");
+	psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
+	psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr);
+
+	/*
+	 *  Check the privilege level of interrupted context.
+	 *   If it is user-mode, then terminate affected process.
+	 */
+
+	pmsa = sos->pal_min_state;
+	if (psr1->cpl != 0 ||
+	   ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) {
+		/*
+		 *  setup for resume to bottom half of MCA,
+		 * "mca_handler_bhhook"
+		 */
+		/* pass to bhhook as argument (gr8, ...) */
+		pmsa->pmsa_gr[8-1] = target_identifier;
+		pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip;
+		pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr;
+		/* set interrupted return address (but no use) */
+		pmsa->pmsa_br0 = pmsa->pmsa_iip;
+		/* change resume address to bottom half */
+		pmsa->pmsa_iip = mca_hdlr_bh->fp;
+		pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp;
+		/* set cpl with kernel mode */
+		psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
+		psr2->cpl = 0;
+		psr2->ri  = 0;
+		psr2->bn  = 1;
+		psr2->i  = 0;
+
+		return mca_recovered("user memory corruption. "
+				"kill affected process - recovered.");
+	}
+
+	return fatal_mca("kernel context not recovered, iip 0x%lx\n",
+			 pmsa->pmsa_iip);
+}
+
+/**
+ * recover_from_platform_error - Recover from platform error.
+ * @slidx:	pointer of index of SAL error record
+ * @peidx:	pointer of index of processor error section
+ * @pbci:	pointer of pal_bus_check_info
+ * @sos:	pointer to hand off struct between SAL and OS
+ *
+ * Return value:
+ *	1 on Success / 0 on Failure
+ */
+
+static int
+recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx,
+			    pal_bus_check_info_t *pbci,
+			    struct ia64_sal_os_state *sos)
+{
+	int status = 0;
+	pal_processor_state_info_t *psp =
+		(pal_processor_state_info_t*)peidx_psp(peidx);
+
+	if (psp->bc && pbci->eb && pbci->bsi == 0) {
+		switch(pbci->type) {
+		case 1: /* partial read */
+		case 3: /* full line(cpu) read */
+		case 9: /* I/O space read */
+			status = recover_from_read_error(slidx, peidx, pbci,
+							 sos);
+			break;
+		case 0: /* unknown */
+		case 2: /* partial write */
+		case 4: /* full line write */
+		case 5: /* implicit or explicit write-back operation */
+		case 6: /* snoop probe */
+		case 7: /* incoming or outgoing ptc.g */
+		case 8: /* write coalescing transactions */
+		case 10: /* I/O space write */
+		case 11: /* inter-processor interrupt message(IPI) */
+		case 12: /* interrupt acknowledge or
+				external task priority cycle */
+		default:
+			break;
+		}
+	} else if (psp->cc && !psp->bc) {	/* Cache error */
+		status = recover_from_read_error(slidx, peidx, pbci, sos);
+	}
+
+	return status;
+}
+
+/*
+ * recover_from_tlb_check
+ * @peidx:	pointer of index of processor error section
+ *
+ * Return value:
+ *	1 on Success / 0 on Failure
+ */
+static int
+recover_from_tlb_check(peidx_table_t *peidx)
+{
+	sal_log_mod_error_info_t *smei;
+	pal_tlb_check_info_t *ptci;
+
+	smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0);
+	ptci = (pal_tlb_check_info_t *)&(smei->check_info);
+
+	/*
+	 * Look for signature of a duplicate TLB DTC entry, which is
+	 * a SW bug and always fatal.
+	 */
+	if (ptci->op == PAL_TLB_CHECK_OP_PURGE
+	    && !(ptci->itr || ptci->dtc || ptci->itc))
+		return fatal_mca("Duplicate TLB entry");
+
+	return mca_recovered("TLB check recovered");
+}
+
+/**
+ * recover_from_processor_error
+ * @platform:	whether there are some platform error section or not
+ * @slidx:	pointer of index of SAL error record
+ * @peidx:	pointer of index of processor error section
+ * @pbci:	pointer of pal_bus_check_info
+ * @sos:	pointer to hand off struct between SAL and OS
+ *
+ * Return value:
+ *	1 on Success / 0 on Failure
+ */
+
+static int
+recover_from_processor_error(int platform, slidx_table_t *slidx,
+			     peidx_table_t *peidx, pal_bus_check_info_t *pbci,
+			     struct ia64_sal_os_state *sos)
+{
+	pal_processor_state_info_t *psp =
+		(pal_processor_state_info_t*)peidx_psp(peidx);
+
+	/*
+	 * Processor recovery status must key off of the PAL recovery
+	 * status in the Processor State Parameter.
+	 */
+
+	/*
+	 * The machine check is corrected.
+	 */
+	if (psp->cm == 1)
+		return mca_recovered("machine check is already corrected.");
+
+	/*
+	 * The error was not contained.  Software must be reset.
+	 */
+	if (psp->us || psp->ci == 0)
+		return fatal_mca("error not contained");
+
+	/*
+	 * Look for recoverable TLB check
+	 */
+	if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc))
+		return recover_from_tlb_check(peidx);
+
+	/*
+	 * The cache check and bus check bits have four possible states
+	 *   cc bc
+	 *    1  1	Memory error, attempt recovery
+	 *    1  0	Cache error, attempt recovery
+	 *    0  1	I/O error, attempt recovery
+	 *    0  0	Other error type, not recovered
+	 */
+	if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL))
+		return fatal_mca("No cache or bus check");
+
+	/*
+	 * Cannot handle more than one bus check.
+	 */
+	if (peidx_bus_check_num(peidx) > 1)
+		return fatal_mca("Too many bus checks");
+
+	if (pbci->ib)
+		return fatal_mca("Internal Bus error");
+	if (pbci->eb && pbci->bsi > 0)
+		return fatal_mca("External bus check fatal status");
+
+	/*
+	 * This is a local MCA and estimated as a recoverable error.
+	 */
+	if (platform)
+		return recover_from_platform_error(slidx, peidx, pbci, sos);
+
+	/*
+	 * On account of strange SAL error record, we cannot recover.
+	 */
+	return fatal_mca("Strange SAL record");
+}
+
+/**
+ * mca_try_to_recover - Try to recover from MCA
+ * @rec:	pointer to a SAL error record
+ * @sos:	pointer to hand off struct between SAL and OS
+ *
+ * Return value:
+ *	1 on Success / 0 on Failure
+ */
+
+static int
+mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos)
+{
+	int platform_err;
+	int n_proc_err;
+	slidx_table_t slidx;
+	peidx_table_t peidx;
+	pal_bus_check_info_t pbci;
+
+	/* Make index of SAL error record */
+	platform_err = mca_make_slidx(rec, &slidx);
+
+	/* Count processor error sections */
+	n_proc_err = slidx_count(&slidx, proc_err);
+
+	 /* Now, OS can recover when there is one processor error section */
+	if (n_proc_err > 1)
+		return fatal_mca("Too Many Errors");
+	else if (n_proc_err == 0)
+		/* Weird SAL record ... We can't do anything */
+		return fatal_mca("Weird SAL record");
+
+	/* Make index of processor error section */
+	mca_make_peidx((sal_log_processor_info_t*)
+		slidx_first_entry(&slidx.proc_err)->hdr, &peidx);
+
+	/* Extract Processor BUS_CHECK[0] */
+	*((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0);
+
+	/* Check whether MCA is global or not */
+	if (is_mca_global(&peidx, &pbci, sos))
+		return fatal_mca("global MCA");
+	
+	/* Try to recover a processor error */
+	return recover_from_processor_error(platform_err, &slidx, &peidx,
+					    &pbci, sos);
+}
+
+/*
+ * =============================================================================
+ */
+
+int __init mca_external_handler_init(void)
+{
+	if (init_record_index_pools())
+		return -ENOMEM;
+
+	/* register external mca handlers */
+	if (ia64_reg_MCA_extension(mca_try_to_recover)) {	
+		printk(KERN_ERR "ia64_reg_MCA_extension failed.\n");
+		kfree(slidx_pool.buffer);
+		return -EFAULT;
+	}
+	return 0;
+}
+
+void __exit mca_external_handler_exit(void)
+{
+	/* unregister external mca handlers */
+	ia64_unreg_MCA_extension();
+	kfree(slidx_pool.buffer);
+}
+
+module_init(mca_external_handler_init);
+module_exit(mca_external_handler_exit);
+
+module_param(sal_rec_max, int, 0644);
+MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record");
+
+MODULE_DESCRIPTION("ia64 platform dependent mca handler driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/ia64/kernel/mca_drv.h b/arch/ia64/kernel/mca_drv.h
new file mode 100644
index 000000000..45bc4e3ae
--- /dev/null
+++ b/arch/ia64/kernel/mca_drv.h
@@ -0,0 +1,123 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * File:	mca_drv.h
+ * Purpose:	Define helpers for Generic MCA handling
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * Copyright (C) 2004 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
+ */
+/*
+ * Processor error section:
+ *
+ *  +-sal_log_processor_info_t *info-------------+
+ *  | sal_log_section_hdr_t header;              |
+ *  | ...                                        |
+ *  | sal_log_mod_error_info_t info[0];          |
+ *  +-+----------------+-------------------------+
+ *    | CACHE_CHECK    |  ^ num_cache_check v
+ *    +----------------+
+ *    | TLB_CHECK      |  ^ num_tlb_check v
+ *    +----------------+
+ *    | BUS_CHECK      |  ^ num_bus_check v
+ *    +----------------+
+ *    | REG_FILE_CHECK |  ^ num_reg_file_check v
+ *    +----------------+
+ *    | MS_CHECK       |  ^ num_ms_check v
+ *  +-struct cpuid_info *id----------------------+
+ *  | regs[5];                                   |
+ *  | reserved;                                  |
+ *  +-sal_processor_static_info_t *regs----------+
+ *  | valid;                                     |
+ *  | ...                                        |
+ *  | fr[128];                                   |
+ *  +--------------------------------------------+
+ */
+
+/* peidx: index of processor error section */
+typedef struct peidx_table {
+	sal_log_processor_info_t        *info;
+	struct sal_cpuid_info           *id;
+	sal_processor_static_info_t     *regs;
+} peidx_table_t;
+
+#define peidx_head(p)   (((p)->info))
+#define peidx_mid(p)    (((p)->id))
+#define peidx_bottom(p) (((p)->regs))
+
+#define peidx_psp(p)           (&(peidx_head(p)->proc_state_parameter))
+#define peidx_field_valid(p)   (&(peidx_head(p)->valid))
+#define peidx_minstate_area(p) (&(peidx_bottom(p)->min_state_area))
+
+#define peidx_cache_check_num(p)    (peidx_head(p)->valid.num_cache_check)
+#define peidx_tlb_check_num(p)      (peidx_head(p)->valid.num_tlb_check)
+#define peidx_bus_check_num(p)      (peidx_head(p)->valid.num_bus_check)
+#define peidx_reg_file_check_num(p) (peidx_head(p)->valid.num_reg_file_check)
+#define peidx_ms_check_num(p)       (peidx_head(p)->valid.num_ms_check)
+
+#define peidx_cache_check_idx(p, n)    (n)
+#define peidx_tlb_check_idx(p, n)      (peidx_cache_check_idx(p, peidx_cache_check_num(p)) + n)
+#define peidx_bus_check_idx(p, n)      (peidx_tlb_check_idx(p, peidx_tlb_check_num(p)) + n)
+#define peidx_reg_file_check_idx(p, n) (peidx_bus_check_idx(p, peidx_bus_check_num(p)) + n)
+#define peidx_ms_check_idx(p, n)       (peidx_reg_file_check_idx(p, peidx_reg_file_check_num(p)) + n)
+
+#define peidx_mod_error_info(p, name, n) \
+({	int __idx = peidx_##name##_idx(p, n); \
+	sal_log_mod_error_info_t *__ret = NULL; \
+	if (peidx_##name##_num(p) > n) /*BUG*/ \
+		__ret = &(peidx_head(p)->info[__idx]); \
+	__ret; })
+
+#define peidx_cache_check(p, n)    peidx_mod_error_info(p, cache_check, n)
+#define peidx_tlb_check(p, n)      peidx_mod_error_info(p, tlb_check, n)
+#define peidx_bus_check(p, n)      peidx_mod_error_info(p, bus_check, n)
+#define peidx_reg_file_check(p, n) peidx_mod_error_info(p, reg_file_check, n)
+#define peidx_ms_check(p, n)       peidx_mod_error_info(p, ms_check, n)
+
+#define peidx_check_info(proc, name, n) \
+({ \
+	sal_log_mod_error_info_t *__info = peidx_mod_error_info(proc, name, n);\
+	u64 __temp = __info && __info->valid.check_info \
+		? __info->check_info : 0; \
+	__temp; })
+
+/* slidx: index of SAL log error record */
+
+typedef struct slidx_list {
+	struct list_head list;
+	sal_log_section_hdr_t *hdr;
+} slidx_list_t;
+
+typedef struct slidx_table {
+	sal_log_record_header_t *header;
+	int n_sections;			/* # of section headers */
+	struct list_head proc_err;
+	struct list_head mem_dev_err;
+	struct list_head sel_dev_err;
+	struct list_head pci_bus_err;
+	struct list_head smbios_dev_err;
+	struct list_head pci_comp_err;
+	struct list_head plat_specific_err;
+	struct list_head host_ctlr_err;
+	struct list_head plat_bus_err;
+	struct list_head unsupported;	/* list of unsupported sections */
+} slidx_table_t;
+
+#define slidx_foreach_entry(pos, head) \
+	list_for_each_entry(pos, head, list)
+#define slidx_first_entry(head) \
+	(((head)->next != (head)) ? list_entry((head)->next, typeof(slidx_list_t), list) : NULL)
+#define slidx_count(slidx, sec) \
+({	int __count = 0; \
+	slidx_list_t *__pos; \
+	slidx_foreach_entry(__pos, &((slidx)->sec)) { __count++; }\
+	__count; })
+
+struct mca_table_entry {
+	int start_addr;	/* location-relative starting address of MCA recoverable range */
+	int end_addr;	/* location-relative ending address of MCA recoverable range */
+};
+
+extern const struct mca_table_entry *search_mca_tables (unsigned long addr);
+extern int mca_recover_range(unsigned long);
+extern void ia64_mlogbuf_dump(void);
+
diff --git a/arch/ia64/kernel/mca_drv_asm.S b/arch/ia64/kernel/mca_drv_asm.S
new file mode 100644
index 000000000..4428f57be
--- /dev/null
+++ b/arch/ia64/kernel/mca_drv_asm.S
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * File:        mca_drv_asm.S
+ * Purpose:     Assembly portion of Generic MCA handling
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * Copyright (C) 2004 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
+ */
+#include <linux/threads.h>
+
+#include <asm/asmmacro.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+
+GLOBAL_ENTRY(mca_handler_bhhook)
+	invala				// clear RSE ?
+	cover
+	;;
+	clrrrb
+	;;						
+	alloc	r16=ar.pfs,0,2,3,0	// make a new frame
+	mov	ar.rsc=0
+	mov	r13=IA64_KR(CURRENT)	// current task pointer
+	;;
+	mov	r2=r13
+	;;
+	addl	r22=IA64_RBS_OFFSET,r2
+	;;
+	mov	ar.bspstore=r22
+	addl	sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2
+	;;
+	adds	r2=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
+	;;
+	st1	[r2]=r0		// clear current->thread.on_ustack flag
+	mov	loc0=r16
+	movl	loc1=mca_handler_bh	// recovery C function
+	;;
+	mov	out0=r8			// poisoned address
+	mov	out1=r9			// iip
+	mov	out2=r10		// psr
+	mov	b6=loc1
+	;;
+	mov	loc1=rp
+	ssm	psr.ic
+	;;
+	srlz.i
+	;;
+	ssm	psr.i
+	br.call.sptk.many rp=b6		// does not return ...
+	;;
+	mov	ar.pfs=loc0
+	mov 	rp=loc1
+	;;
+	mov	r8=r0
+	br.ret.sptk.many rp
+END(mca_handler_bhhook)
diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h
new file mode 100644
index 000000000..d6eab2a10
--- /dev/null
+++ b/arch/ia64/kernel/minstate.h
@@ -0,0 +1,251 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <asm/cache.h>
+
+#include "entry.h"
+#include <asm/native/inst.h>
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+/* read ar.itc in advance, and use it before leaving bank 0 */
+#define ACCOUNT_GET_STAMP				\
+(pUStk) mov.m r20=ar.itc;
+#define ACCOUNT_SYS_ENTER				\
+(pUStk) br.call.spnt rp=account_sys_enter		\
+	;;
+#else
+#define ACCOUNT_GET_STAMP
+#define ACCOUNT_SYS_ENTER
+#endif
+
+.section ".data..patch.rse", "a"
+.previous
+
+/*
+ * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
+ * the minimum state necessary that allows us to turn psr.ic back
+ * on.
+ *
+ * Assumed state upon entry:
+ *	psr.ic: off
+ *	r31:	contains saved predicates (pr)
+ *
+ * Upon exit, the state is as follows:
+ *	psr.ic: off
+ *	 r2 = points to &pt_regs.r16
+ *	 r8 = contents of ar.ccv
+ *	 r9 = contents of ar.csd
+ *	r10 = contents of ar.ssd
+ *	r11 = FPSR_DEFAULT
+ *	r12 = kernel sp (kernel virtual address)
+ *	r13 = points to current task_struct (kernel virtual address)
+ *	p15 = TRUE if psr.i is set in cr.ipsr
+ *	predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
+ *		preserved
+ *
+ * Note that psr.ic is NOT turned on by this macro.  This is so that
+ * we can pass interruption state as arguments to a handler.
+ */
+#define IA64_NATIVE_DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA,WORKAROUND)				\
+	mov r16=IA64_KR(CURRENT);	/* M */							\
+	mov r27=ar.rsc;			/* M */							\
+	mov r20=r1;			/* A */							\
+	mov r25=ar.unat;		/* M */							\
+	MOV_FROM_IPSR(p0,r29);		/* M */							\
+	mov r26=ar.pfs;			/* I */							\
+	MOV_FROM_IIP(r28);			/* M */						\
+	mov r21=ar.fpsr;		/* M */							\
+	__COVER;				/* B;; (or nothing) */				\
+	;;											\
+	adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16;						\
+	;;											\
+	ld1 r17=[r16];				/* load current->thread.on_ustack flag */	\
+	st1 [r16]=r0;				/* clear current->thread.on_ustack flag */	\
+	adds r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16						\
+	/* switch from user to kernel RBS: */							\
+	;;											\
+	invala;				/* M */							\
+	SAVE_IFS;										\
+	cmp.eq pKStk,pUStk=r0,r17;		/* are we in kernel mode already? */		\
+	;;											\
+(pUStk)	mov ar.rsc=0;		/* set enforced lazy mode, pl 0, little-endian, loadrs=0 */	\
+	;;											\
+(pUStk)	mov.m r24=ar.rnat;									\
+(pUStk)	addl r22=IA64_RBS_OFFSET,r1;			/* compute base of RBS */		\
+(pKStk) mov r1=sp;					/* get sp  */				\
+	;;											\
+(pUStk) lfetch.fault.excl.nt1 [r22];								\
+(pUStk)	addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1;	/* compute base of memory stack */	\
+(pUStk)	mov r23=ar.bspstore;				/* save ar.bspstore */			\
+	;;											\
+(pUStk)	mov ar.bspstore=r22;				/* switch to kernel RBS */		\
+(pKStk) addl r1=-IA64_PT_REGS_SIZE,r1;			/* if in kernel mode, use sp (r12) */	\
+	;;											\
+(pUStk)	mov r18=ar.bsp;										\
+(pUStk)	mov ar.rsc=0x3;		/* set eager mode, pl 0, little-endian, loadrs=0 */		\
+	adds r17=2*L1_CACHE_BYTES,r1;		/* really: biggest cache-line size */		\
+	adds r16=PT(CR_IPSR),r1;								\
+	;;											\
+	lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES;						\
+	st8 [r16]=r29;		/* save cr.ipsr */						\
+	;;											\
+	lfetch.fault.excl.nt1 [r17];								\
+	tbit.nz p15,p0=r29,IA64_PSR_I_BIT;							\
+	mov r29=b0										\
+	;;											\
+	WORKAROUND;										\
+	adds r16=PT(R8),r1;	/* initialize first base pointer */				\
+	adds r17=PT(R9),r1;	/* initialize second base pointer */				\
+(pKStk)	mov r18=r0;		/* make sure r18 isn't NaT */					\
+	;;											\
+.mem.offset 0,0; st8.spill [r16]=r8,16;								\
+.mem.offset 8,0; st8.spill [r17]=r9,16;								\
+        ;;											\
+.mem.offset 0,0; st8.spill [r16]=r10,24;							\
+.mem.offset 8,0; st8.spill [r17]=r11,24;							\
+        ;;											\
+	st8 [r16]=r28,16;	/* save cr.iip */						\
+	st8 [r17]=r30,16;	/* save cr.ifs */						\
+(pUStk)	sub r18=r18,r22;	/* r18=RSE.ndirty*8 */						\
+	mov r8=ar.ccv;										\
+	mov r9=ar.csd;										\
+	mov r10=ar.ssd;										\
+	movl r11=FPSR_DEFAULT;   /* L-unit */							\
+	;;											\
+	st8 [r16]=r25,16;	/* save ar.unat */						\
+	st8 [r17]=r26,16;	/* save ar.pfs */						\
+	shl r18=r18,16;		/* compute ar.rsc to be used for "loadrs" */			\
+	;;											\
+	st8 [r16]=r27,16;	/* save ar.rsc */						\
+(pUStk)	st8 [r17]=r24,16;	/* save ar.rnat */						\
+(pKStk)	adds r17=16,r17;	/* skip over ar_rnat field */					\
+	;;			/* avoid RAW on r16 & r17 */					\
+(pUStk)	st8 [r16]=r23,16;	/* save ar.bspstore */						\
+	st8 [r17]=r31,16;	/* save predicates */						\
+(pKStk)	adds r16=16,r16;	/* skip over ar_bspstore field */				\
+	;;											\
+	st8 [r16]=r29,16;	/* save b0 */							\
+	st8 [r17]=r18,16;	/* save ar.rsc value for "loadrs" */				\
+	cmp.eq pNonSys,pSys=r0,r0	/* initialize pSys=0, pNonSys=1 */			\
+	;;											\
+.mem.offset 0,0; st8.spill [r16]=r20,16;	/* save original r1 */				\
+.mem.offset 8,0; st8.spill [r17]=r12,16;							\
+	adds r12=-16,r1;	/* switch to kernel memory stack (with 16 bytes of scratch) */	\
+	;;											\
+.mem.offset 0,0; st8.spill [r16]=r13,16;							\
+.mem.offset 8,0; st8.spill [r17]=r21,16;	/* save ar.fpsr */				\
+	mov r13=IA64_KR(CURRENT);	/* establish `current' */				\
+	;;											\
+.mem.offset 0,0; st8.spill [r16]=r15,16;							\
+.mem.offset 8,0; st8.spill [r17]=r14,16;							\
+	;;											\
+.mem.offset 0,0; st8.spill [r16]=r2,16;								\
+.mem.offset 8,0; st8.spill [r17]=r3,16;								\
+	ACCOUNT_GET_STAMP									\
+	adds r2=IA64_PT_REGS_R16_OFFSET,r1;							\
+	;;											\
+	EXTRA;											\
+	movl r1=__gp;		/* establish kernel global pointer */				\
+	;;											\
+	ACCOUNT_SYS_ENTER									\
+	bsw.1;			/* switch back to bank 1 (must be last in insn group) */	\
+	;;
+
+/*
+ * SAVE_REST saves the remainder of pt_regs (with psr.ic on).
+ *
+ * Assumed state upon entry:
+ *	psr.ic: on
+ *	r2:	points to &pt_regs.r16
+ *	r3:	points to &pt_regs.r17
+ *	r8:	contents of ar.ccv
+ *	r9:	contents of ar.csd
+ *	r10:	contents of ar.ssd
+ *	r11:	FPSR_DEFAULT
+ *
+ * Registers r14 and r15 are guaranteed not to be touched by SAVE_REST.
+ */
+#define SAVE_REST				\
+.mem.offset 0,0; st8.spill [r2]=r16,16;		\
+.mem.offset 8,0; st8.spill [r3]=r17,16;		\
+	;;					\
+.mem.offset 0,0; st8.spill [r2]=r18,16;		\
+.mem.offset 8,0; st8.spill [r3]=r19,16;		\
+	;;					\
+.mem.offset 0,0; st8.spill [r2]=r20,16;		\
+.mem.offset 8,0; st8.spill [r3]=r21,16;		\
+	mov r18=b6;				\
+	;;					\
+.mem.offset 0,0; st8.spill [r2]=r22,16;		\
+.mem.offset 8,0; st8.spill [r3]=r23,16;		\
+	mov r19=b7;				\
+	;;					\
+.mem.offset 0,0; st8.spill [r2]=r24,16;		\
+.mem.offset 8,0; st8.spill [r3]=r25,16;		\
+	;;					\
+.mem.offset 0,0; st8.spill [r2]=r26,16;		\
+.mem.offset 8,0; st8.spill [r3]=r27,16;		\
+	;;					\
+.mem.offset 0,0; st8.spill [r2]=r28,16;		\
+.mem.offset 8,0; st8.spill [r3]=r29,16;		\
+	;;					\
+.mem.offset 0,0; st8.spill [r2]=r30,16;		\
+.mem.offset 8,0; st8.spill [r3]=r31,32;		\
+	;;					\
+	mov ar.fpsr=r11;	/* M-unit */	\
+	st8 [r2]=r8,8;		/* ar.ccv */	\
+	adds r24=PT(B6)-PT(F7),r3;		\
+	;;					\
+	stf.spill [r2]=f6,32;			\
+	stf.spill [r3]=f7,32;			\
+	;;					\
+	stf.spill [r2]=f8,32;			\
+	stf.spill [r3]=f9,32;			\
+	;;					\
+	stf.spill [r2]=f10;			\
+	stf.spill [r3]=f11;			\
+	adds r25=PT(B7)-PT(F11),r3;		\
+	;;					\
+	st8 [r24]=r18,16;       /* b6 */	\
+	st8 [r25]=r19,16;       /* b7 */	\
+	;;					\
+	st8 [r24]=r9;        	/* ar.csd */	\
+	st8 [r25]=r10;      	/* ar.ssd */	\
+	;;
+
+#define RSE_WORKAROUND				\
+(pUStk) extr.u r17=r18,3,6;			\
+(pUStk)	sub r16=r18,r22;			\
+[1:](pKStk)	br.cond.sptk.many 1f;		\
+	.xdata4 ".data..patch.rse",1b-.		\
+	;;					\
+	cmp.ge p6,p7 = 33,r17;			\
+	;;					\
+(p6)	mov r17=0x310;				\
+(p7)	mov r17=0x308;				\
+	;;					\
+	cmp.leu p1,p0=r16,r17;			\
+(p1)	br.cond.sptk.many 1f;			\
+	dep.z r17=r26,0,62;			\
+	movl r16=2f;				\
+	;;					\
+	mov ar.pfs=r17;				\
+	dep r27=r0,r27,16,14;			\
+	mov b0=r16;				\
+	;;					\
+	br.ret.sptk b0;				\
+	;;					\
+2:						\
+	mov ar.rsc=r0				\
+	;;					\
+	flushrs;				\
+	;;					\
+	mov ar.bspstore=r22			\
+	;;					\
+	mov r18=ar.bsp;				\
+	;;					\
+1:						\
+	.pred.rel "mutex", pKStk, pUStk
+
+#define SAVE_MIN_WITH_COVER	DO_SAVE_MIN(COVER, mov r30=cr.ifs, , RSE_WORKAROUND)
+#define SAVE_MIN_WITH_COVER_R19	DO_SAVE_MIN(COVER, mov r30=cr.ifs, mov r15=r19, RSE_WORKAROUND)
+#define SAVE_MIN			DO_SAVE_MIN(     , mov r30=r0, , )
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
new file mode 100644
index 000000000..8f62cf97f
--- /dev/null
+++ b/arch/ia64/kernel/module.c
@@ -0,0 +1,955 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * IA-64-specific support for kernel module loader.
+ *
+ * Copyright (C) 2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Loosely based on patch by Rusty Russell.
+ */
+
+/* relocs tested so far:
+
+   DIR64LSB
+   FPTR64LSB
+   GPREL22
+   LDXMOV
+   LDXMOV
+   LTOFF22
+   LTOFF22X
+   LTOFF22X
+   LTOFF_FPTR22
+   PCREL21B	(for br.call only; br.cond is not supported out of modules!)
+   PCREL60B	(for brl.cond only; brl.call is not supported for modules!)
+   PCREL64LSB
+   SECREL32LSB
+   SEGREL64LSB
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/elf.h>
+#include <linux/moduleloader.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+
+#include <asm/patch.h>
+#include <asm/unaligned.h>
+#include <asm/sections.h>
+
+#define ARCH_MODULE_DEBUG 0
+
+#if ARCH_MODULE_DEBUG
+# define DEBUGP printk
+# define inline
+#else
+# define DEBUGP(fmt , a...)
+#endif
+
+#ifdef CONFIG_ITANIUM
+# define USE_BRL	0
+#else
+# define USE_BRL	1
+#endif
+
+#define MAX_LTOFF	((uint64_t) (1 << 22))	/* max. allowable linkage-table offset */
+
+/* Define some relocation helper macros/types: */
+
+#define FORMAT_SHIFT	0
+#define FORMAT_BITS	3
+#define FORMAT_MASK	((1 << FORMAT_BITS) - 1)
+#define VALUE_SHIFT	3
+#define VALUE_BITS	5
+#define VALUE_MASK	((1 << VALUE_BITS) - 1)
+
+enum reloc_target_format {
+	/* direct encoded formats: */
+	RF_NONE = 0,
+	RF_INSN14 = 1,
+	RF_INSN22 = 2,
+	RF_INSN64 = 3,
+	RF_32MSB = 4,
+	RF_32LSB = 5,
+	RF_64MSB = 6,
+	RF_64LSB = 7,
+
+	/* formats that cannot be directly decoded: */
+	RF_INSN60,
+	RF_INSN21B,	/* imm21 form 1 */
+	RF_INSN21M,	/* imm21 form 2 */
+	RF_INSN21F	/* imm21 form 3 */
+};
+
+enum reloc_value_formula {
+	RV_DIRECT = 4,		/* S + A */
+	RV_GPREL = 5,		/* @gprel(S + A) */
+	RV_LTREL = 6,		/* @ltoff(S + A) */
+	RV_PLTREL = 7,		/* @pltoff(S + A) */
+	RV_FPTR = 8,		/* @fptr(S + A) */
+	RV_PCREL = 9,		/* S + A - P */
+	RV_LTREL_FPTR = 10,	/* @ltoff(@fptr(S + A)) */
+	RV_SEGREL = 11,		/* @segrel(S + A) */
+	RV_SECREL = 12,		/* @secrel(S + A) */
+	RV_BDREL = 13,		/* BD + A */
+	RV_LTV = 14,		/* S + A (like RV_DIRECT, except frozen at static link-time) */
+	RV_PCREL2 = 15,		/* S + A - P */
+	RV_SPECIAL = 16,	/* various (see below) */
+	RV_RSVD17 = 17,
+	RV_TPREL = 18,		/* @tprel(S + A) */
+	RV_LTREL_TPREL = 19,	/* @ltoff(@tprel(S + A)) */
+	RV_DTPMOD = 20,		/* @dtpmod(S + A) */
+	RV_LTREL_DTPMOD = 21,	/* @ltoff(@dtpmod(S + A)) */
+	RV_DTPREL = 22,		/* @dtprel(S + A) */
+	RV_LTREL_DTPREL = 23,	/* @ltoff(@dtprel(S + A)) */
+	RV_RSVD24 = 24,
+	RV_RSVD25 = 25,
+	RV_RSVD26 = 26,
+	RV_RSVD27 = 27
+	/* 28-31 reserved for implementation-specific purposes.  */
+};
+
+#define N(reloc)	[R_IA64_##reloc] = #reloc
+
+static const char *reloc_name[256] = {
+	N(NONE),		N(IMM14),		N(IMM22),		N(IMM64),
+	N(DIR32MSB),		N(DIR32LSB),		N(DIR64MSB),		N(DIR64LSB),
+	N(GPREL22),		N(GPREL64I),		N(GPREL32MSB),		N(GPREL32LSB),
+	N(GPREL64MSB),		N(GPREL64LSB),		N(LTOFF22),		N(LTOFF64I),
+	N(PLTOFF22),		N(PLTOFF64I),		N(PLTOFF64MSB),		N(PLTOFF64LSB),
+	N(FPTR64I),		N(FPTR32MSB),		N(FPTR32LSB),		N(FPTR64MSB),
+	N(FPTR64LSB),		N(PCREL60B),		N(PCREL21B),		N(PCREL21M),
+	N(PCREL21F),		N(PCREL32MSB),		N(PCREL32LSB),		N(PCREL64MSB),
+	N(PCREL64LSB),		N(LTOFF_FPTR22),	N(LTOFF_FPTR64I),	N(LTOFF_FPTR32MSB),
+	N(LTOFF_FPTR32LSB),	N(LTOFF_FPTR64MSB),	N(LTOFF_FPTR64LSB),	N(SEGREL32MSB),
+	N(SEGREL32LSB),		N(SEGREL64MSB),		N(SEGREL64LSB),		N(SECREL32MSB),
+	N(SECREL32LSB),		N(SECREL64MSB),		N(SECREL64LSB),		N(REL32MSB),
+	N(REL32LSB),		N(REL64MSB),		N(REL64LSB),		N(LTV32MSB),
+	N(LTV32LSB),		N(LTV64MSB),		N(LTV64LSB),		N(PCREL21BI),
+	N(PCREL22),		N(PCREL64I),		N(IPLTMSB),		N(IPLTLSB),
+	N(COPY),		N(LTOFF22X),		N(LDXMOV),		N(TPREL14),
+	N(TPREL22),		N(TPREL64I),		N(TPREL64MSB),		N(TPREL64LSB),
+	N(LTOFF_TPREL22),	N(DTPMOD64MSB),		N(DTPMOD64LSB),		N(LTOFF_DTPMOD22),
+	N(DTPREL14),		N(DTPREL22),		N(DTPREL64I),		N(DTPREL32MSB),
+	N(DTPREL32LSB),		N(DTPREL64MSB),		N(DTPREL64LSB),		N(LTOFF_DTPREL22)
+};
+
+#undef N
+
+/* Opaque struct for insns, to protect against derefs. */
+struct insn;
+
+static inline uint64_t
+bundle (const struct insn *insn)
+{
+	return (uint64_t) insn & ~0xfUL;
+}
+
+static inline int
+slot (const struct insn *insn)
+{
+	return (uint64_t) insn & 0x3;
+}
+
+static int
+apply_imm64 (struct module *mod, struct insn *insn, uint64_t val)
+{
+	if (slot(insn) != 1 && slot(insn) != 2) {
+		printk(KERN_ERR "%s: invalid slot number %d for IMM64\n",
+		       mod->name, slot(insn));
+		return 0;
+	}
+	ia64_patch_imm64((u64) insn, val);
+	return 1;
+}
+
+static int
+apply_imm60 (struct module *mod, struct insn *insn, uint64_t val)
+{
+	if (slot(insn) != 1 && slot(insn) != 2) {
+		printk(KERN_ERR "%s: invalid slot number %d for IMM60\n",
+		       mod->name, slot(insn));
+		return 0;
+	}
+	if (val + ((uint64_t) 1 << 59) >= (1UL << 60)) {
+		printk(KERN_ERR "%s: value %ld out of IMM60 range\n",
+			mod->name, (long) val);
+		return 0;
+	}
+	ia64_patch_imm60((u64) insn, val);
+	return 1;
+}
+
+static int
+apply_imm22 (struct module *mod, struct insn *insn, uint64_t val)
+{
+	if (val + (1 << 21) >= (1 << 22)) {
+		printk(KERN_ERR "%s: value %li out of IMM22 range\n",
+			mod->name, (long)val);
+		return 0;
+	}
+	ia64_patch((u64) insn, 0x01fffcfe000UL, (  ((val & 0x200000UL) << 15) /* bit 21 -> 36 */
+					         | ((val & 0x1f0000UL) <<  6) /* bit 16 -> 22 */
+					         | ((val & 0x00ff80UL) << 20) /* bit  7 -> 27 */
+					         | ((val & 0x00007fUL) << 13) /* bit  0 -> 13 */));
+	return 1;
+}
+
+static int
+apply_imm21b (struct module *mod, struct insn *insn, uint64_t val)
+{
+	if (val + (1 << 20) >= (1 << 21)) {
+		printk(KERN_ERR "%s: value %li out of IMM21b range\n",
+			mod->name, (long)val);
+		return 0;
+	}
+	ia64_patch((u64) insn, 0x11ffffe000UL, (  ((val & 0x100000UL) << 16) /* bit 20 -> 36 */
+					        | ((val & 0x0fffffUL) << 13) /* bit  0 -> 13 */));
+	return 1;
+}
+
+#if USE_BRL
+
+struct plt_entry {
+	/* Three instruction bundles in PLT. */
+ 	unsigned char bundle[2][16];
+};
+
+static const struct plt_entry ia64_plt_template = {
+	{
+		{
+			0x04, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x20, /*	     movl gp=TARGET_GP */
+			0x00, 0x00, 0x00, 0x60
+		},
+		{
+			0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /*	     brl.many gp=TARGET_GP */
+			0x08, 0x00, 0x00, 0xc0
+		}
+	}
+};
+
+static int
+patch_plt (struct module *mod, struct plt_entry *plt, long target_ip, unsigned long target_gp)
+{
+	if (apply_imm64(mod, (struct insn *) (plt->bundle[0] + 2), target_gp)
+	    && apply_imm60(mod, (struct insn *) (plt->bundle[1] + 2),
+			   (target_ip - (int64_t) plt->bundle[1]) / 16))
+		return 1;
+	return 0;
+}
+
+unsigned long
+plt_target (struct plt_entry *plt)
+{
+	uint64_t b0, b1, *b = (uint64_t *) plt->bundle[1];
+	long off;
+
+	b0 = b[0]; b1 = b[1];
+	off = (  ((b1 & 0x00fffff000000000UL) >> 36)		/* imm20b -> bit 0 */
+	       | ((b0 >> 48) << 20) | ((b1 & 0x7fffffUL) << 36)	/* imm39 -> bit 20 */
+	       | ((b1 & 0x0800000000000000UL) << 0));		/* i -> bit 59 */
+	return (long) plt->bundle[1] + 16*off;
+}
+
+#else /* !USE_BRL */
+
+struct plt_entry {
+	/* Three instruction bundles in PLT. */
+ 	unsigned char bundle[3][16];
+};
+
+static const struct plt_entry ia64_plt_template = {
+	{
+		{
+			0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /*	     movl r16=TARGET_IP */
+			0x02, 0x00, 0x00, 0x60
+		},
+		{
+			0x04, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x20, /*	     movl gp=TARGET_GP */
+			0x00, 0x00, 0x00, 0x60
+		},
+		{
+			0x11, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MIB] nop.m 0 */
+			0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /*	     mov b6=r16 */
+			0x60, 0x00, 0x80, 0x00		    /*	     br.few b6 */
+		}
+	}
+};
+
+static int
+patch_plt (struct module *mod, struct plt_entry *plt, long target_ip, unsigned long target_gp)
+{
+	if (apply_imm64(mod, (struct insn *) (plt->bundle[0] + 2), target_ip)
+	    && apply_imm64(mod, (struct insn *) (plt->bundle[1] + 2), target_gp))
+		return 1;
+	return 0;
+}
+
+unsigned long
+plt_target (struct plt_entry *plt)
+{
+	uint64_t b0, b1, *b = (uint64_t *) plt->bundle[0];
+
+	b0 = b[0]; b1 = b[1];
+	return (  ((b1 & 0x000007f000000000) >> 36)		/* imm7b -> bit 0 */
+		| ((b1 & 0x07fc000000000000) >> 43)		/* imm9d -> bit 7 */
+		| ((b1 & 0x0003e00000000000) >> 29)		/* imm5c -> bit 16 */
+		| ((b1 & 0x0000100000000000) >> 23)		/* ic -> bit 21 */
+		| ((b0 >> 46) << 22) | ((b1 & 0x7fffff) << 40)	/* imm41 -> bit 22 */
+		| ((b1 & 0x0800000000000000) <<  4));		/* i -> bit 63 */
+}
+
+#endif /* !USE_BRL */
+
+void
+module_arch_freeing_init (struct module *mod)
+{
+	if (mod->arch.init_unw_table) {
+		unw_remove_unwind_table(mod->arch.init_unw_table);
+		mod->arch.init_unw_table = NULL;
+	}
+}
+
+/* Have we already seen one of these relocations? */
+/* FIXME: we could look in other sections, too --RR */
+static int
+duplicate_reloc (const Elf64_Rela *rela, unsigned int num)
+{
+	unsigned int i;
+
+	for (i = 0; i < num; i++) {
+		if (rela[i].r_info == rela[num].r_info && rela[i].r_addend == rela[num].r_addend)
+			return 1;
+	}
+	return 0;
+}
+
+/* Count how many GOT entries we may need */
+static unsigned int
+count_gots (const Elf64_Rela *rela, unsigned int num)
+{
+	unsigned int i, ret = 0;
+
+	/* Sure, this is order(n^2), but it's usually short, and not
+           time critical */
+	for (i = 0; i < num; i++) {
+		switch (ELF64_R_TYPE(rela[i].r_info)) {
+		      case R_IA64_LTOFF22:
+		      case R_IA64_LTOFF22X:
+		      case R_IA64_LTOFF64I:
+		      case R_IA64_LTOFF_FPTR22:
+		      case R_IA64_LTOFF_FPTR64I:
+		      case R_IA64_LTOFF_FPTR32MSB:
+		      case R_IA64_LTOFF_FPTR32LSB:
+		      case R_IA64_LTOFF_FPTR64MSB:
+		      case R_IA64_LTOFF_FPTR64LSB:
+			if (!duplicate_reloc(rela, i))
+				ret++;
+			break;
+		}
+	}
+	return ret;
+}
+
+/* Count how many PLT entries we may need */
+static unsigned int
+count_plts (const Elf64_Rela *rela, unsigned int num)
+{
+	unsigned int i, ret = 0;
+
+	/* Sure, this is order(n^2), but it's usually short, and not
+           time critical */
+	for (i = 0; i < num; i++) {
+		switch (ELF64_R_TYPE(rela[i].r_info)) {
+		      case R_IA64_PCREL21B:
+		      case R_IA64_PLTOFF22:
+		      case R_IA64_PLTOFF64I:
+		      case R_IA64_PLTOFF64MSB:
+		      case R_IA64_PLTOFF64LSB:
+		      case R_IA64_IPLTMSB:
+		      case R_IA64_IPLTLSB:
+			if (!duplicate_reloc(rela, i))
+				ret++;
+			break;
+		}
+	}
+	return ret;
+}
+
+/* We need to create an function-descriptors for any internal function
+   which is referenced. */
+static unsigned int
+count_fdescs (const Elf64_Rela *rela, unsigned int num)
+{
+	unsigned int i, ret = 0;
+
+	/* Sure, this is order(n^2), but it's usually short, and not time critical.  */
+	for (i = 0; i < num; i++) {
+		switch (ELF64_R_TYPE(rela[i].r_info)) {
+		      case R_IA64_FPTR64I:
+		      case R_IA64_FPTR32LSB:
+		      case R_IA64_FPTR32MSB:
+		      case R_IA64_FPTR64LSB:
+		      case R_IA64_FPTR64MSB:
+		      case R_IA64_LTOFF_FPTR22:
+		      case R_IA64_LTOFF_FPTR32LSB:
+		      case R_IA64_LTOFF_FPTR32MSB:
+		      case R_IA64_LTOFF_FPTR64I:
+		      case R_IA64_LTOFF_FPTR64LSB:
+		      case R_IA64_LTOFF_FPTR64MSB:
+		      case R_IA64_IPLTMSB:
+		      case R_IA64_IPLTLSB:
+			/*
+			 * Jumps to static functions sometimes go straight to their
+			 * offset.  Of course, that may not be possible if the jump is
+			 * from init -> core or vice. versa, so we need to generate an
+			 * FDESC (and PLT etc) for that.
+			 */
+		      case R_IA64_PCREL21B:
+			if (!duplicate_reloc(rela, i))
+				ret++;
+			break;
+		}
+	}
+	return ret;
+}
+
+int
+module_frob_arch_sections (Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, char *secstrings,
+			   struct module *mod)
+{
+	unsigned long core_plts = 0, init_plts = 0, gots = 0, fdescs = 0;
+	Elf64_Shdr *s, *sechdrs_end = sechdrs + ehdr->e_shnum;
+
+	/*
+	 * To store the PLTs and function-descriptors, we expand the .text section for
+	 * core module-code and the .init.text section for initialization code.
+	 */
+	for (s = sechdrs; s < sechdrs_end; ++s)
+		if (strcmp(".core.plt", secstrings + s->sh_name) == 0)
+			mod->arch.core_plt = s;
+		else if (strcmp(".init.plt", secstrings + s->sh_name) == 0)
+			mod->arch.init_plt = s;
+		else if (strcmp(".got", secstrings + s->sh_name) == 0)
+			mod->arch.got = s;
+		else if (strcmp(".opd", secstrings + s->sh_name) == 0)
+			mod->arch.opd = s;
+		else if (strcmp(".IA_64.unwind", secstrings + s->sh_name) == 0)
+			mod->arch.unwind = s;
+
+	if (!mod->arch.core_plt || !mod->arch.init_plt || !mod->arch.got || !mod->arch.opd) {
+		printk(KERN_ERR "%s: sections missing\n", mod->name);
+		return -ENOEXEC;
+	}
+
+	/* GOT and PLTs can occur in any relocated section... */
+	for (s = sechdrs + 1; s < sechdrs_end; ++s) {
+		const Elf64_Rela *rels = (void *)ehdr + s->sh_offset;
+		unsigned long numrels = s->sh_size/sizeof(Elf64_Rela);
+
+		if (s->sh_type != SHT_RELA)
+			continue;
+
+		gots += count_gots(rels, numrels);
+		fdescs += count_fdescs(rels, numrels);
+		if (strstr(secstrings + s->sh_name, ".init"))
+			init_plts += count_plts(rels, numrels);
+		else
+			core_plts += count_plts(rels, numrels);
+	}
+
+	mod->arch.core_plt->sh_type = SHT_NOBITS;
+	mod->arch.core_plt->sh_flags = SHF_EXECINSTR | SHF_ALLOC;
+	mod->arch.core_plt->sh_addralign = 16;
+	mod->arch.core_plt->sh_size = core_plts * sizeof(struct plt_entry);
+	mod->arch.init_plt->sh_type = SHT_NOBITS;
+	mod->arch.init_plt->sh_flags = SHF_EXECINSTR | SHF_ALLOC;
+	mod->arch.init_plt->sh_addralign = 16;
+	mod->arch.init_plt->sh_size = init_plts * sizeof(struct plt_entry);
+	mod->arch.got->sh_type = SHT_NOBITS;
+	mod->arch.got->sh_flags = ARCH_SHF_SMALL | SHF_ALLOC;
+	mod->arch.got->sh_addralign = 8;
+	mod->arch.got->sh_size = gots * sizeof(struct got_entry);
+	mod->arch.opd->sh_type = SHT_NOBITS;
+	mod->arch.opd->sh_flags = SHF_ALLOC;
+	mod->arch.opd->sh_addralign = 8;
+	mod->arch.opd->sh_size = fdescs * sizeof(struct fdesc);
+	DEBUGP("%s: core.plt=%lx, init.plt=%lx, got=%lx, fdesc=%lx\n",
+	       __func__, mod->arch.core_plt->sh_size, mod->arch.init_plt->sh_size,
+	       mod->arch.got->sh_size, mod->arch.opd->sh_size);
+	return 0;
+}
+
+static inline int
+in_init (const struct module *mod, uint64_t addr)
+{
+	return addr - (uint64_t) mod->init_layout.base < mod->init_layout.size;
+}
+
+static inline int
+in_core (const struct module *mod, uint64_t addr)
+{
+	return addr - (uint64_t) mod->core_layout.base < mod->core_layout.size;
+}
+
+static inline int
+is_internal (const struct module *mod, uint64_t value)
+{
+	return in_init(mod, value) || in_core(mod, value);
+}
+
+/*
+ * Get gp-relative offset for the linkage-table entry of VALUE.
+ */
+static uint64_t
+get_ltoff (struct module *mod, uint64_t value, int *okp)
+{
+	struct got_entry *got, *e;
+
+	if (!*okp)
+		return 0;
+
+	got = (void *) mod->arch.got->sh_addr;
+	for (e = got; e < got + mod->arch.next_got_entry; ++e)
+		if (e->val == value)
+			goto found;
+
+	/* Not enough GOT entries? */
+	BUG_ON(e >= (struct got_entry *) (mod->arch.got->sh_addr + mod->arch.got->sh_size));
+
+	e->val = value;
+	++mod->arch.next_got_entry;
+  found:
+	return (uint64_t) e - mod->arch.gp;
+}
+
+static inline int
+gp_addressable (struct module *mod, uint64_t value)
+{
+	return value - mod->arch.gp + MAX_LTOFF/2 < MAX_LTOFF;
+}
+
+/* Get PC-relative PLT entry for this value.  Returns 0 on failure. */
+static uint64_t
+get_plt (struct module *mod, const struct insn *insn, uint64_t value, int *okp)
+{
+	struct plt_entry *plt, *plt_end;
+	uint64_t target_ip, target_gp;
+
+	if (!*okp)
+		return 0;
+
+	if (in_init(mod, (uint64_t) insn)) {
+		plt = (void *) mod->arch.init_plt->sh_addr;
+		plt_end = (void *) plt + mod->arch.init_plt->sh_size;
+	} else {
+		plt = (void *) mod->arch.core_plt->sh_addr;
+		plt_end = (void *) plt + mod->arch.core_plt->sh_size;
+	}
+
+	/* "value" is a pointer to a function-descriptor; fetch the target ip/gp from it: */
+	target_ip = ((uint64_t *) value)[0];
+	target_gp = ((uint64_t *) value)[1];
+
+	/* Look for existing PLT entry. */
+	while (plt->bundle[0][0]) {
+		if (plt_target(plt) == target_ip)
+			goto found;
+		if (++plt >= plt_end)
+			BUG();
+	}
+	*plt = ia64_plt_template;
+	if (!patch_plt(mod, plt, target_ip, target_gp)) {
+		*okp = 0;
+		return 0;
+	}
+#if ARCH_MODULE_DEBUG
+	if (plt_target(plt) != target_ip) {
+		printk("%s: mistargeted PLT: wanted %lx, got %lx\n",
+		       __func__, target_ip, plt_target(plt));
+		*okp = 0;
+		return 0;
+	}
+#endif
+  found:
+	return (uint64_t) plt;
+}
+
+/* Get function descriptor for VALUE. */
+static uint64_t
+get_fdesc (struct module *mod, uint64_t value, int *okp)
+{
+	struct fdesc *fdesc = (void *) mod->arch.opd->sh_addr;
+
+	if (!*okp)
+		return 0;
+
+	if (!value) {
+		printk(KERN_ERR "%s: fdesc for zero requested!\n", mod->name);
+		return 0;
+	}
+
+	if (!is_internal(mod, value))
+		/*
+		 * If it's not a module-local entry-point, "value" already points to a
+		 * function-descriptor.
+		 */
+		return value;
+
+	/* Look for existing function descriptor. */
+	while (fdesc->addr) {
+		if (fdesc->addr == value)
+			return (uint64_t)fdesc;
+		if ((uint64_t) ++fdesc >= mod->arch.opd->sh_addr + mod->arch.opd->sh_size)
+			BUG();
+	}
+
+	/* Create new one */
+	fdesc->addr = value;
+	fdesc->gp = mod->arch.gp;
+	return (uint64_t) fdesc;
+}
+
+static inline int
+do_reloc (struct module *mod, uint8_t r_type, Elf64_Sym *sym, uint64_t addend,
+	  Elf64_Shdr *sec, void *location)
+{
+	enum reloc_target_format format = (r_type >> FORMAT_SHIFT) & FORMAT_MASK;
+	enum reloc_value_formula formula = (r_type >> VALUE_SHIFT) & VALUE_MASK;
+	uint64_t val;
+	int ok = 1;
+
+	val = sym->st_value + addend;
+
+	switch (formula) {
+	      case RV_SEGREL:	/* segment base is arbitrarily chosen to be 0 for kernel modules */
+	      case RV_DIRECT:
+		break;
+
+	      case RV_GPREL:	  val -= mod->arch.gp; break;
+	      case RV_LTREL:	  val = get_ltoff(mod, val, &ok); break;
+	      case RV_PLTREL:	  val = get_plt(mod, location, val, &ok); break;
+	      case RV_FPTR:	  val = get_fdesc(mod, val, &ok); break;
+	      case RV_SECREL:	  val -= sec->sh_addr; break;
+	      case RV_LTREL_FPTR: val = get_ltoff(mod, get_fdesc(mod, val, &ok), &ok); break;
+
+	      case RV_PCREL:
+		switch (r_type) {
+		      case R_IA64_PCREL21B:
+			if ((in_init(mod, val) && in_core(mod, (uint64_t)location)) ||
+			    (in_core(mod, val) && in_init(mod, (uint64_t)location))) {
+				/*
+				 * Init section may have been allocated far away from core,
+				 * if the branch won't reach, then allocate a plt for it.
+				 */
+				uint64_t delta = ((int64_t)val - (int64_t)location) / 16;
+				if (delta + (1 << 20) >= (1 << 21)) {
+					val = get_fdesc(mod, val, &ok);
+					val = get_plt(mod, location, val, &ok);
+				}
+			} else if (!is_internal(mod, val))
+				val = get_plt(mod, location, val, &ok);
+			fallthrough;
+		      default:
+			val -= bundle(location);
+			break;
+
+		      case R_IA64_PCREL32MSB:
+		      case R_IA64_PCREL32LSB:
+		      case R_IA64_PCREL64MSB:
+		      case R_IA64_PCREL64LSB:
+			val -= (uint64_t) location;
+			break;
+
+		}
+		switch (r_type) {
+		      case R_IA64_PCREL60B: format = RF_INSN60; break;
+		      case R_IA64_PCREL21B: format = RF_INSN21B; break;
+		      case R_IA64_PCREL21M: format = RF_INSN21M; break;
+		      case R_IA64_PCREL21F: format = RF_INSN21F; break;
+		      default: break;
+		}
+		break;
+
+	      case RV_BDREL:
+		val -= (uint64_t) (in_init(mod, val) ? mod->init_layout.base : mod->core_layout.base);
+		break;
+
+	      case RV_LTV:
+		/* can link-time value relocs happen here?  */
+		BUG();
+		break;
+
+	      case RV_PCREL2:
+		if (r_type == R_IA64_PCREL21BI) {
+			if (!is_internal(mod, val)) {
+				printk(KERN_ERR "%s: %s reloc against "
+					"non-local symbol (%lx)\n", __func__,
+					reloc_name[r_type], (unsigned long)val);
+				return -ENOEXEC;
+			}
+			format = RF_INSN21B;
+		}
+		val -= bundle(location);
+		break;
+
+	      case RV_SPECIAL:
+		switch (r_type) {
+		      case R_IA64_IPLTMSB:
+		      case R_IA64_IPLTLSB:
+			val = get_fdesc(mod, get_plt(mod, location, val, &ok), &ok);
+			format = RF_64LSB;
+			if (r_type == R_IA64_IPLTMSB)
+				format = RF_64MSB;
+			break;
+
+		      case R_IA64_SUB:
+			val = addend - sym->st_value;
+			format = RF_INSN64;
+			break;
+
+		      case R_IA64_LTOFF22X:
+			if (gp_addressable(mod, val))
+				val -= mod->arch.gp;
+			else
+				val = get_ltoff(mod, val, &ok);
+			format = RF_INSN22;
+			break;
+
+		      case R_IA64_LDXMOV:
+			if (gp_addressable(mod, val)) {
+				/* turn "ld8" into "mov": */
+				DEBUGP("%s: patching ld8 at %p to mov\n", __func__, location);
+				ia64_patch((u64) location, 0x1fff80fe000UL, 0x10000000000UL);
+			}
+			return 0;
+
+		      default:
+			if (reloc_name[r_type])
+				printk(KERN_ERR "%s: special reloc %s not supported",
+				       mod->name, reloc_name[r_type]);
+			else
+				printk(KERN_ERR "%s: unknown special reloc %x\n",
+				       mod->name, r_type);
+			return -ENOEXEC;
+		}
+		break;
+
+	      case RV_TPREL:
+	      case RV_LTREL_TPREL:
+	      case RV_DTPMOD:
+	      case RV_LTREL_DTPMOD:
+	      case RV_DTPREL:
+	      case RV_LTREL_DTPREL:
+		printk(KERN_ERR "%s: %s reloc not supported\n",
+		       mod->name, reloc_name[r_type] ? reloc_name[r_type] : "?");
+		return -ENOEXEC;
+
+	      default:
+		printk(KERN_ERR "%s: unknown reloc %x\n", mod->name, r_type);
+		return -ENOEXEC;
+	}
+
+	if (!ok)
+		return -ENOEXEC;
+
+	DEBUGP("%s: [%p]<-%016lx = %s(%lx)\n", __func__, location, val,
+	       reloc_name[r_type] ? reloc_name[r_type] : "?", sym->st_value + addend);
+
+	switch (format) {
+	      case RF_INSN21B:	ok = apply_imm21b(mod, location, (int64_t) val / 16); break;
+	      case RF_INSN22:	ok = apply_imm22(mod, location, val); break;
+	      case RF_INSN64:	ok = apply_imm64(mod, location, val); break;
+	      case RF_INSN60:	ok = apply_imm60(mod, location, (int64_t) val / 16); break;
+	      case RF_32LSB:	put_unaligned(val, (uint32_t *) location); break;
+	      case RF_64LSB:	put_unaligned(val, (uint64_t *) location); break;
+	      case RF_32MSB:	/* ia64 Linux is little-endian... */
+	      case RF_64MSB:	/* ia64 Linux is little-endian... */
+	      case RF_INSN14:	/* must be within-module, i.e., resolved by "ld -r" */
+	      case RF_INSN21M:	/* must be within-module, i.e., resolved by "ld -r" */
+	      case RF_INSN21F:	/* must be within-module, i.e., resolved by "ld -r" */
+		printk(KERN_ERR "%s: format %u needed by %s reloc is not supported\n",
+		       mod->name, format, reloc_name[r_type] ? reloc_name[r_type] : "?");
+		return -ENOEXEC;
+
+	      default:
+		printk(KERN_ERR "%s: relocation %s resulted in unknown format %u\n",
+		       mod->name, reloc_name[r_type] ? reloc_name[r_type] : "?", format);
+		return -ENOEXEC;
+	}
+	return ok ? 0 : -ENOEXEC;
+}
+
+int
+apply_relocate_add (Elf64_Shdr *sechdrs, const char *strtab, unsigned int symindex,
+		    unsigned int relsec, struct module *mod)
+{
+	unsigned int i, n = sechdrs[relsec].sh_size / sizeof(Elf64_Rela);
+	Elf64_Rela *rela = (void *) sechdrs[relsec].sh_addr;
+	Elf64_Shdr *target_sec;
+	int ret;
+
+	DEBUGP("%s: applying section %u (%u relocs) to %u\n", __func__,
+	       relsec, n, sechdrs[relsec].sh_info);
+
+	target_sec = sechdrs + sechdrs[relsec].sh_info;
+
+	if (target_sec->sh_entsize == ~0UL)
+		/*
+		 * If target section wasn't allocated, we don't need to relocate it.
+		 * Happens, e.g., for debug sections.
+		 */
+		return 0;
+
+	if (!mod->arch.gp) {
+		/*
+		 * XXX Should have an arch-hook for running this after final section
+		 *     addresses have been selected...
+		 */
+		uint64_t gp;
+		if (mod->core_layout.size > MAX_LTOFF)
+			/*
+			 * This takes advantage of fact that SHF_ARCH_SMALL gets allocated
+			 * at the end of the module.
+			 */
+			gp = mod->core_layout.size - MAX_LTOFF / 2;
+		else
+			gp = mod->core_layout.size / 2;
+		gp = (uint64_t) mod->core_layout.base + ((gp + 7) & -8);
+		mod->arch.gp = gp;
+		DEBUGP("%s: placing gp at 0x%lx\n", __func__, gp);
+	}
+
+	for (i = 0; i < n; i++) {
+		ret = do_reloc(mod, ELF64_R_TYPE(rela[i].r_info),
+			       ((Elf64_Sym *) sechdrs[symindex].sh_addr
+				+ ELF64_R_SYM(rela[i].r_info)),
+			       rela[i].r_addend, target_sec,
+			       (void *) target_sec->sh_addr + rela[i].r_offset);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+/*
+ * Modules contain a single unwind table which covers both the core and the init text
+ * sections but since the two are not contiguous, we need to split this table up such that
+ * we can register (and unregister) each "segment" separately.  Fortunately, this sounds
+ * more complicated than it really is.
+ */
+static void
+register_unwind_table (struct module *mod)
+{
+	struct unw_table_entry *start = (void *) mod->arch.unwind->sh_addr;
+	struct unw_table_entry *end = start + mod->arch.unwind->sh_size / sizeof (*start);
+	struct unw_table_entry *e1, *e2, *core, *init;
+	unsigned long num_init = 0, num_core = 0;
+
+	/* First, count how many init and core unwind-table entries there are.  */
+	for (e1 = start; e1 < end; ++e1)
+		if (in_init(mod, e1->start_offset))
+			++num_init;
+		else
+			++num_core;
+	/*
+	 * Second, sort the table such that all unwind-table entries for the init and core
+	 * text sections are nicely separated.  We do this with a stupid bubble sort
+	 * (unwind tables don't get ridiculously huge).
+	 */
+	for (e1 = start; e1 < end; ++e1) {
+		for (e2 = e1 + 1; e2 < end; ++e2) {
+			if (e2->start_offset < e1->start_offset) {
+				swap(*e1, *e2);
+			}
+		}
+	}
+	/*
+	 * Third, locate the init and core segments in the unwind table:
+	 */
+	if (in_init(mod, start->start_offset)) {
+		init = start;
+		core = start + num_init;
+	} else {
+		core = start;
+		init = start + num_core;
+	}
+
+	DEBUGP("%s: name=%s, gp=%lx, num_init=%lu, num_core=%lu\n", __func__,
+	       mod->name, mod->arch.gp, num_init, num_core);
+
+	/*
+	 * Fourth, register both tables (if not empty).
+	 */
+	if (num_core > 0) {
+		mod->arch.core_unw_table = unw_add_unwind_table(mod->name, 0, mod->arch.gp,
+								core, core + num_core);
+		DEBUGP("%s:  core: handle=%p [%p-%p)\n", __func__,
+		       mod->arch.core_unw_table, core, core + num_core);
+	}
+	if (num_init > 0) {
+		mod->arch.init_unw_table = unw_add_unwind_table(mod->name, 0, mod->arch.gp,
+								init, init + num_init);
+		DEBUGP("%s:  init: handle=%p [%p-%p)\n", __func__,
+		       mod->arch.init_unw_table, init, init + num_init);
+	}
+}
+
+int
+module_finalize (const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *mod)
+{
+	struct mod_arch_specific *mas = &mod->arch;
+
+	DEBUGP("%s: init: entry=%p\n", __func__, mod->init);
+	if (mas->unwind)
+		register_unwind_table(mod);
+
+	/*
+	 * ".opd" was already relocated to the final destination. Store
+	 * it's address for use in symbolizer.
+	 */
+	mas->opd_addr = (void *)mas->opd->sh_addr;
+	mas->opd_size = mas->opd->sh_size;
+
+	/*
+	 * Module relocation was already done at this point. Section
+	 * headers are about to be deleted. Wipe out load-time context.
+	 */
+	mas->core_plt = NULL;
+	mas->init_plt = NULL;
+	mas->got = NULL;
+	mas->opd = NULL;
+	mas->unwind = NULL;
+	mas->gp = 0;
+	mas->next_got_entry = 0;
+
+	return 0;
+}
+
+void
+module_arch_cleanup (struct module *mod)
+{
+	if (mod->arch.init_unw_table) {
+		unw_remove_unwind_table(mod->arch.init_unw_table);
+		mod->arch.init_unw_table = NULL;
+	}
+	if (mod->arch.core_unw_table) {
+		unw_remove_unwind_table(mod->arch.core_unw_table);
+		mod->arch.core_unw_table = NULL;
+	}
+}
+
+void *dereference_module_function_descriptor(struct module *mod, void *ptr)
+{
+	struct mod_arch_specific *mas = &mod->arch;
+
+	if (ptr < mas->opd_addr || ptr >= mas->opd_addr + mas->opd_size)
+		return ptr;
+
+	return dereference_function_descriptor(ptr);
+}
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
new file mode 100644
index 000000000..025e5133c
--- /dev/null
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MSI hooks for standard x86 apic
+ */
+
+#include <linux/pci.h>
+#include <linux/irq.h>
+#include <linux/msi.h>
+#include <linux/dmar.h>
+#include <asm/smp.h>
+#include <asm/msidef.h>
+
+static struct irq_chip	ia64_msi_chip;
+
+#ifdef CONFIG_SMP
+static int ia64_set_msi_irq_affinity(struct irq_data *idata,
+				     const cpumask_t *cpu_mask, bool force)
+{
+	struct msi_msg msg;
+	u32 addr, data;
+	int cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
+	unsigned int irq = idata->irq;
+
+	if (irq_prepare_move(irq, cpu))
+		return -1;
+
+	__get_cached_msi_msg(irq_data_get_msi_desc(idata), &msg);
+
+	addr = msg.address_lo;
+	addr &= MSI_ADDR_DEST_ID_MASK;
+	addr |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
+	msg.address_lo = addr;
+
+	data = msg.data;
+	data &= MSI_DATA_VECTOR_MASK;
+	data |= MSI_DATA_VECTOR(irq_to_vector(irq));
+	msg.data = data;
+
+	pci_write_msi_msg(irq, &msg);
+	irq_data_update_affinity(idata, cpumask_of(cpu));
+
+	return 0;
+}
+#endif /* CONFIG_SMP */
+
+int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct msi_msg	msg;
+	unsigned long	dest_phys_id;
+	int	irq, vector;
+
+	irq = create_irq();
+	if (irq < 0)
+		return irq;
+
+	irq_set_msi_desc(irq, desc);
+	dest_phys_id = cpu_physical_id(cpumask_any_and(&(irq_to_domain(irq)),
+						       cpu_online_mask));
+	vector = irq_to_vector(irq);
+
+	msg.address_hi = 0;
+	msg.address_lo =
+		MSI_ADDR_HEADER |
+		MSI_ADDR_DEST_MODE_PHYS |
+		MSI_ADDR_REDIRECTION_CPU |
+		MSI_ADDR_DEST_ID_CPU(dest_phys_id);
+
+	msg.data =
+		MSI_DATA_TRIGGER_EDGE |
+		MSI_DATA_LEVEL_ASSERT |
+		MSI_DATA_DELIVERY_FIXED |
+		MSI_DATA_VECTOR(vector);
+
+	pci_write_msi_msg(irq, &msg);
+	irq_set_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);
+
+	return 0;
+}
+
+void arch_teardown_msi_irq(unsigned int irq)
+{
+	destroy_irq(irq);
+}
+
+static void ia64_ack_msi_irq(struct irq_data *data)
+{
+	irq_complete_move(data->irq);
+	irq_move_irq(data);
+	ia64_eoi();
+}
+
+static int ia64_msi_retrigger_irq(struct irq_data *data)
+{
+	unsigned int vector = irq_to_vector(data->irq);
+	ia64_resend_irq(vector);
+
+	return 1;
+}
+
+/*
+ * Generic ops used on most IA64 platforms.
+ */
+static struct irq_chip ia64_msi_chip = {
+	.name			= "PCI-MSI",
+	.irq_mask		= pci_msi_mask_irq,
+	.irq_unmask		= pci_msi_unmask_irq,
+	.irq_ack		= ia64_ack_msi_irq,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= ia64_set_msi_irq_affinity,
+#endif
+	.irq_retrigger		= ia64_msi_retrigger_irq,
+};
+
+#ifdef CONFIG_INTEL_IOMMU
+#ifdef CONFIG_SMP
+static int dmar_msi_set_affinity(struct irq_data *data,
+				 const struct cpumask *mask, bool force)
+{
+	unsigned int irq = data->irq;
+	struct irq_cfg *cfg = irq_cfg + irq;
+	struct msi_msg msg;
+	int cpu = cpumask_first_and(mask, cpu_online_mask);
+
+	if (irq_prepare_move(irq, cpu))
+		return -1;
+
+	dmar_msi_read(irq, &msg);
+
+	msg.data &= ~MSI_DATA_VECTOR_MASK;
+	msg.data |= MSI_DATA_VECTOR(cfg->vector);
+	msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+	msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
+
+	dmar_msi_write(irq, &msg);
+	irq_data_update_affinity(data, mask);
+
+	return 0;
+}
+#endif /* CONFIG_SMP */
+
+static struct irq_chip dmar_msi_type = {
+	.name = "DMAR_MSI",
+	.irq_unmask = dmar_msi_unmask,
+	.irq_mask = dmar_msi_mask,
+	.irq_ack = ia64_ack_msi_irq,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = dmar_msi_set_affinity,
+#endif
+	.irq_retrigger = ia64_msi_retrigger_irq,
+};
+
+static void
+msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
+{
+	struct irq_cfg *cfg = irq_cfg + irq;
+	unsigned dest;
+
+	dest = cpu_physical_id(cpumask_first_and(&(irq_to_domain(irq)),
+						 cpu_online_mask));
+
+	msg->address_hi = 0;
+	msg->address_lo =
+		MSI_ADDR_HEADER |
+		MSI_ADDR_DEST_MODE_PHYS |
+		MSI_ADDR_REDIRECTION_CPU |
+		MSI_ADDR_DEST_ID_CPU(dest);
+
+	msg->data =
+		MSI_DATA_TRIGGER_EDGE |
+		MSI_DATA_LEVEL_ASSERT |
+		MSI_DATA_DELIVERY_FIXED |
+		MSI_DATA_VECTOR(cfg->vector);
+}
+
+int dmar_alloc_hwirq(int id, int node, void *arg)
+{
+	int irq;
+	struct msi_msg msg;
+
+	irq = create_irq();
+	if (irq > 0) {
+		irq_set_handler_data(irq, arg);
+		irq_set_chip_and_handler_name(irq, &dmar_msi_type,
+					      handle_edge_irq, "edge");
+		msi_compose_msg(NULL, irq, &msg);
+		dmar_msi_write(irq, &msg);
+	}
+
+	return irq;
+}
+
+void dmar_free_hwirq(int irq)
+{
+	irq_set_handler_data(irq, NULL);
+	destroy_irq(irq);
+}
+#endif /* CONFIG_INTEL_IOMMU */
+
diff --git a/arch/ia64/kernel/numa.c b/arch/ia64/kernel/numa.c
new file mode 100644
index 000000000..8a959f206
--- /dev/null
+++ b/arch/ia64/kernel/numa.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * ia64 kernel NUMA specific stuff
+ *
+ * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
+ * Copyright (C) 2004 Silicon Graphics, Inc.
+ *   Jesse Barnes <jbarnes@sgi.com>
+ */
+#include <linux/topology.h>
+#include <linux/module.h>
+#include <asm/processor.h>
+#include <asm/smp.h>
+
+u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
+EXPORT_SYMBOL(cpu_to_node_map);
+
+cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
+EXPORT_SYMBOL(node_to_cpu_mask);
+
+void map_cpu_to_node(int cpu, int nid)
+{
+	int oldnid;
+	if (nid < 0) { /* just initialize by zero */
+		cpu_to_node_map[cpu] = 0;
+		return;
+	}
+	/* sanity check first */
+	oldnid = cpu_to_node_map[cpu];
+	if (cpumask_test_cpu(cpu, &node_to_cpu_mask[oldnid])) {
+		return; /* nothing to do */
+	}
+	/* we don't have cpu-driven node hot add yet...
+	   In usual case, node is created from SRAT at boot time. */
+	if (!node_online(nid))
+		nid = first_online_node;
+	cpu_to_node_map[cpu] = nid;
+	cpumask_set_cpu(cpu, &node_to_cpu_mask[nid]);
+	return;
+}
+
+void unmap_cpu_from_node(int cpu, int nid)
+{
+	WARN_ON(!cpumask_test_cpu(cpu, &node_to_cpu_mask[nid]));
+	WARN_ON(cpu_to_node_map[cpu] != nid);
+	cpu_to_node_map[cpu] = 0;
+	cpumask_clear_cpu(cpu, &node_to_cpu_mask[nid]);
+}
+
+
+/**
+ * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
+ *
+ * Build cpu to node mapping and initialize the per node cpu masks using
+ * info from the node_cpuid array handed to us by ACPI.
+ */
+void __init build_cpu_to_node_map(void)
+{
+	int cpu, i, node;
+
+	for(node=0; node < MAX_NUMNODES; node++)
+		cpumask_clear(&node_to_cpu_mask[node]);
+
+	for_each_possible_early_cpu(cpu) {
+		node = NUMA_NO_NODE;
+		for (i = 0; i < NR_CPUS; ++i)
+			if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) {
+				node = node_cpuid[i].nid;
+				break;
+			}
+		map_cpu_to_node(cpu, node);
+	}
+}
diff --git a/arch/ia64/kernel/pal.S b/arch/ia64/kernel/pal.S
new file mode 100644
index 000000000..06d01a070
--- /dev/null
+++ b/arch/ia64/kernel/pal.S
@@ -0,0 +1,306 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PAL Firmware support
+ * IA-64 Processor Programmers Reference Vol 2
+ *
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999-2001, 2003 Hewlett-Packard Co
+ *	David Mosberger <davidm@hpl.hp.com>
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ *
+ * 05/22/2000 eranian Added support for stacked register calls
+ * 05/24/2000 eranian Added support for physical mode static calls
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/processor.h>
+#include <asm/export.h>
+
+	.data
+pal_entry_point:
+	data8 ia64_pal_default_handler
+	.text
+
+/*
+ * Set the PAL entry point address.  This could be written in C code, but we
+ * do it here to keep it all in one module (besides, it's so trivial that it's
+ * not a big deal).
+ *
+ * in0		Address of the PAL entry point (text address, NOT a function
+ *		descriptor).
+ */
+GLOBAL_ENTRY(ia64_pal_handler_init)
+	alloc r3=ar.pfs,1,0,0,0
+	movl r2=pal_entry_point
+	;;
+	st8 [r2]=in0
+	br.ret.sptk.many rp
+END(ia64_pal_handler_init)
+
+/*
+ * Default PAL call handler.  This needs to be coded in assembly because it
+ * uses the static calling convention, i.e., the RSE may not be used and
+ * calls are done via "br.cond" (not "br.call").
+ */
+GLOBAL_ENTRY(ia64_pal_default_handler)
+	mov r8=-1
+	br.cond.sptk.many rp
+END(ia64_pal_default_handler)
+
+/*
+ * Make a PAL call using the static calling convention.
+ *
+ * in0         Index of PAL service
+ * in1 - in3   Remaining PAL arguments
+ */
+GLOBAL_ENTRY(ia64_pal_call_static)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
+	alloc loc1 = ar.pfs,4,5,0,0
+	movl loc2 = pal_entry_point
+1:	{
+	  mov r28 = in0
+	  mov r29 = in1
+	  mov r8 = ip
+	}
+	;;
+	ld8 loc2 = [loc2]		// loc2 <- entry point
+	adds r8 = 1f-1b,r8
+	mov loc4=ar.rsc			// save RSE configuration
+	;;
+	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	mov loc3 = psr
+	mov loc0 = rp
+	.body
+	mov r30 = in2
+
+	mov r31 = in3
+	mov b7 = loc2
+
+	rsm psr.i
+	;;
+	mov rp = r8
+	br.cond.sptk.many b7
+1:	mov psr.l = loc3
+	mov ar.rsc = loc4		// restore RSE configuration
+	mov ar.pfs = loc1
+	mov rp = loc0
+	;;
+	srlz.d				// serialize restoration of psr.l
+	br.ret.sptk.many b0
+END(ia64_pal_call_static)
+EXPORT_SYMBOL(ia64_pal_call_static)
+
+/*
+ * Make a PAL call using the stacked registers calling convention.
+ *
+ * Inputs:
+ *	in0         Index of PAL service
+ *	in2 - in3   Remaining PAL arguments
+ */
+GLOBAL_ENTRY(ia64_pal_call_stacked)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
+	alloc loc1 = ar.pfs,4,4,4,0
+	movl loc2 = pal_entry_point
+
+	mov r28  = in0			// Index MUST be copied to r28
+	mov out0 = in0			// AND in0 of PAL function
+	mov loc0 = rp
+	.body
+	;;
+	ld8 loc2 = [loc2]		// loc2 <- entry point
+	mov out1 = in1
+	mov out2 = in2
+	mov out3 = in3
+	mov loc3 = psr
+	;;
+	rsm psr.i
+	mov b7 = loc2
+	;;
+	br.call.sptk.many rp=b7		// now make the call
+.ret0:	mov psr.l  = loc3
+	mov ar.pfs = loc1
+	mov rp = loc0
+	;;
+	srlz.d				// serialize restoration of psr.l
+	br.ret.sptk.many b0
+END(ia64_pal_call_stacked)
+EXPORT_SYMBOL(ia64_pal_call_stacked)
+
+/*
+ * Make a physical mode PAL call using the static registers calling convention.
+ *
+ * Inputs:
+ *	in0         Index of PAL service
+ *	in2 - in3   Remaining PAL arguments
+ *
+ * PSR_LP, PSR_TB, PSR_ID, PSR_DA are never set by the kernel.
+ * So we don't need to clear them.
+ */
+#define PAL_PSR_BITS_TO_CLEAR						      \
+	(IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT  | IA64_PSR_DB | IA64_PSR_RT |\
+	 IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED |	      \
+	 IA64_PSR_DFL | IA64_PSR_DFH)
+
+#define PAL_PSR_BITS_TO_SET						      \
+	(IA64_PSR_BN)
+
+
+GLOBAL_ENTRY(ia64_pal_call_phys_static)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
+	alloc loc1 = ar.pfs,4,7,0,0
+	movl loc2 = pal_entry_point
+1:	{
+	  mov r28  = in0		// copy procedure index
+	  mov r8   = ip			// save ip to compute branch
+	  mov loc0 = rp			// save rp
+	}
+	.body
+	;;
+	ld8 loc2 = [loc2]		// loc2 <- entry point
+	mov r29  = in1			// first argument
+	mov r30  = in2			// copy arg2
+	mov r31  = in3			// copy arg3
+	;;
+	mov loc3 = psr			// save psr
+	adds r8  = 1f-1b,r8		// calculate return address for call
+	;;
+	mov loc4=ar.rsc			// save RSE configuration
+	dep.z loc2=loc2,0,61		// convert pal entry point to physical
+	tpa r8=r8			// convert rp to physical
+	;;
+	mov b7 = loc2			// install target to branch reg
+	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	movl r16=PAL_PSR_BITS_TO_CLEAR
+	movl r17=PAL_PSR_BITS_TO_SET
+	;;
+	or loc3=loc3,r17		// add in psr the bits to set
+	;;
+	andcm r16=loc3,r16		// removes bits to clear from psr
+	br.call.sptk.many rp=ia64_switch_mode_phys
+	mov rp = r8			// install return address (physical)
+	mov loc5 = r19
+	mov loc6 = r20
+	br.cond.sptk.many b7
+1:
+	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	mov r16=loc3			// r16= original psr
+	mov r19=loc5
+	mov r20=loc6
+	br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
+	mov psr.l = loc3		// restore init PSR
+
+	mov ar.pfs = loc1
+	mov rp = loc0
+	;;
+	mov ar.rsc=loc4			// restore RSE configuration
+	srlz.d				// serialize restoration of psr.l
+	br.ret.sptk.many b0
+END(ia64_pal_call_phys_static)
+EXPORT_SYMBOL(ia64_pal_call_phys_static)
+
+/*
+ * Make a PAL call using the stacked registers in physical mode.
+ *
+ * Inputs:
+ *	in0         Index of PAL service
+ *	in2 - in3   Remaining PAL arguments
+ */
+GLOBAL_ENTRY(ia64_pal_call_phys_stacked)
+	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
+	alloc	loc1 = ar.pfs,5,7,4,0
+	movl	loc2 = pal_entry_point
+1:	{
+	  mov r28  = in0		// copy procedure index
+	  mov loc0 = rp			// save rp
+	}
+	.body
+	;;
+	ld8 loc2 = [loc2]		// loc2 <- entry point
+	mov loc3 = psr			// save psr
+	;;
+	mov loc4=ar.rsc			// save RSE configuration
+	dep.z loc2=loc2,0,61		// convert pal entry point to physical
+	;;
+	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	movl r16=PAL_PSR_BITS_TO_CLEAR
+	movl r17=PAL_PSR_BITS_TO_SET
+	;;
+	or loc3=loc3,r17		// add in psr the bits to set
+	mov b7 = loc2			// install target to branch reg
+	;;
+	andcm r16=loc3,r16		// removes bits to clear from psr
+	br.call.sptk.many rp=ia64_switch_mode_phys
+
+	mov out0 = in0			// first argument
+	mov out1 = in1			// copy arg2
+	mov out2 = in2			// copy arg3
+	mov out3 = in3			// copy arg3
+	mov loc5 = r19
+	mov loc6 = r20
+
+	br.call.sptk.many rp=b7		// now make the call
+
+	mov ar.rsc=0			// put RSE in enforced lazy, LE mode
+	mov r16=loc3			// r16= original psr
+	mov r19=loc5
+	mov r20=loc6
+	br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
+
+	mov psr.l  = loc3		// restore init PSR
+	mov ar.pfs = loc1
+	mov rp = loc0
+	;;
+	mov ar.rsc=loc4			// restore RSE configuration
+	srlz.d				// serialize restoration of psr.l
+	br.ret.sptk.many b0
+END(ia64_pal_call_phys_stacked)
+EXPORT_SYMBOL(ia64_pal_call_phys_stacked)
+
+/*
+ * Save scratch fp scratch regs which aren't saved in pt_regs already
+ * (fp10-fp15).
+ *
+ * NOTE: We need to do this since firmware (SAL and PAL) may use any of the
+ * scratch regs fp-low partition.
+ *
+ * Inputs:
+ *      in0	Address of stack storage for fp regs
+ */
+GLOBAL_ENTRY(ia64_save_scratch_fpregs)
+	alloc r3=ar.pfs,1,0,0,0
+	add r2=16,in0
+	;;
+	stf.spill [in0] = f10,32
+	stf.spill [r2]  = f11,32
+	;;
+	stf.spill [in0] = f12,32
+	stf.spill [r2]  = f13,32
+	;;
+	stf.spill [in0] = f14,32
+	stf.spill [r2]  = f15,32
+	br.ret.sptk.many rp
+END(ia64_save_scratch_fpregs)
+EXPORT_SYMBOL(ia64_save_scratch_fpregs)
+
+/*
+ * Load scratch fp scratch regs (fp10-fp15)
+ *
+ * Inputs:
+ *      in0	Address of stack storage for fp regs
+ */
+GLOBAL_ENTRY(ia64_load_scratch_fpregs)
+	alloc r3=ar.pfs,1,0,0,0
+	add r2=16,in0
+	;;
+	ldf.fill  f10 = [in0],32
+	ldf.fill  f11 = [r2],32
+	;;
+	ldf.fill  f12 = [in0],32
+	ldf.fill  f13 = [r2],32
+	;;
+	ldf.fill  f14 = [in0],32
+	ldf.fill  f15 = [r2],32
+	br.ret.sptk.many rp
+END(ia64_load_scratch_fpregs)
+EXPORT_SYMBOL(ia64_load_scratch_fpregs)
diff --git a/arch/ia64/kernel/palinfo.c b/arch/ia64/kernel/palinfo.c
new file mode 100644
index 000000000..b9ae093bf
--- /dev/null
+++ b/arch/ia64/kernel/palinfo.c
@@ -0,0 +1,942 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * palinfo.c
+ *
+ * Prints processor specific information reported by PAL.
+ * This code is based on specification of PAL as of the
+ * Intel IA-64 Architecture Software Developer's Manual v1.0.
+ *
+ *
+ * Copyright (C) 2000-2001, 2003 Hewlett-Packard Co
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2004 Intel Corporation
+ *  Ashok Raj <ashok.raj@intel.com>
+ *
+ * 05/26/2000	S.Eranian	initial release
+ * 08/21/2000	S.Eranian	updated to July 2000 PAL specs
+ * 02/05/2001   S.Eranian	fixed module support
+ * 10/23/2001	S.Eranian	updated pal_perf_mon_info bug fixes
+ * 03/24/2004	Ashok Raj	updated to work with CPU Hotplug
+ * 10/26/2006   Russ Anderson	updated processor features to rev 2.2 spec
+ */
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/efi.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+
+#include <asm/pal.h>
+#include <asm/sal.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <linux/smp.h>
+
+MODULE_AUTHOR("Stephane Eranian <eranian@hpl.hp.com>");
+MODULE_DESCRIPTION("/proc interface to IA-64 PAL");
+MODULE_LICENSE("GPL");
+
+#define PALINFO_VERSION "0.5"
+
+typedef int (*palinfo_func_t)(struct seq_file *);
+
+typedef struct {
+	const char		*name;		/* name of the proc entry */
+	palinfo_func_t		proc_read;	/* function to call for reading */
+	struct proc_dir_entry	*entry;		/* registered entry (removal) */
+} palinfo_entry_t;
+
+
+/*
+ *  A bunch of string array to get pretty printing
+ */
+
+static const char *cache_types[] = {
+	"",			/* not used */
+	"Instruction",
+	"Data",
+	"Data/Instruction"	/* unified */
+};
+
+static const char *cache_mattrib[]={
+	"WriteThrough",
+	"WriteBack",
+	"",		/* reserved */
+	""		/* reserved */
+};
+
+static const char *cache_st_hints[]={
+	"Temporal, level 1",
+	"Reserved",
+	"Reserved",
+	"Non-temporal, all levels",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved"
+};
+
+static const char *cache_ld_hints[]={
+	"Temporal, level 1",
+	"Non-temporal, level 1",
+	"Reserved",
+	"Non-temporal, all levels",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved"
+};
+
+static const char *rse_hints[]={
+	"enforced lazy",
+	"eager stores",
+	"eager loads",
+	"eager loads and stores"
+};
+
+#define RSE_HINTS_COUNT ARRAY_SIZE(rse_hints)
+
+static const char *mem_attrib[]={
+	"WB",		/* 000 */
+	"SW",		/* 001 */
+	"010",		/* 010 */
+	"011",		/* 011 */
+	"UC",		/* 100 */
+	"UCE",		/* 101 */
+	"WC",		/* 110 */
+	"NaTPage"	/* 111 */
+};
+
+/*
+ * Take a 64bit vector and produces a string such that
+ * if bit n is set then 2^n in clear text is generated. The adjustment
+ * to the right unit is also done.
+ *
+ * Input:
+ *	- a pointer to a buffer to hold the string
+ *	- a 64-bit vector
+ * Output:
+ *	- a pointer to the end of the buffer
+ *
+ */
+static void bitvector_process(struct seq_file *m, u64 vector)
+{
+	int i,j;
+	static const char *units[]={ "", "K", "M", "G", "T" };
+
+	for (i=0, j=0; i < 64; i++ , j=i/10) {
+		if (vector & 0x1)
+			seq_printf(m, "%d%s ", 1 << (i-j*10), units[j]);
+		vector >>= 1;
+	}
+}
+
+/*
+ * Take a 64bit vector and produces a string such that
+ * if bit n is set then register n is present. The function
+ * takes into account consecutive registers and prints out ranges.
+ *
+ * Input:
+ *	- a pointer to a buffer to hold the string
+ *	- a 64-bit vector
+ * Ouput:
+ *	- a pointer to the end of the buffer
+ *
+ */
+static void bitregister_process(struct seq_file *m, u64 *reg_info, int max)
+{
+	int i, begin, skip = 0;
+	u64 value = reg_info[0];
+
+	value >>= i = begin = ffs(value) - 1;
+
+	for(; i < max; i++ ) {
+
+		if (i != 0 && (i%64) == 0) value = *++reg_info;
+
+		if ((value & 0x1) == 0 && skip == 0) {
+			if (begin  <= i - 2)
+				seq_printf(m, "%d-%d ", begin, i-1);
+			else
+				seq_printf(m, "%d ", i-1);
+			skip  = 1;
+			begin = -1;
+		} else if ((value & 0x1) && skip == 1) {
+			skip = 0;
+			begin = i;
+		}
+		value >>=1;
+	}
+	if (begin > -1) {
+		if (begin < 127)
+			seq_printf(m, "%d-127", begin);
+		else
+			seq_puts(m, "127");
+	}
+}
+
+static int power_info(struct seq_file *m)
+{
+	s64 status;
+	u64 halt_info_buffer[8];
+	pal_power_mgmt_info_u_t *halt_info =(pal_power_mgmt_info_u_t *)halt_info_buffer;
+	int i;
+
+	status = ia64_pal_halt_info(halt_info);
+	if (status != 0) return 0;
+
+	for (i=0; i < 8 ; i++ ) {
+		if (halt_info[i].pal_power_mgmt_info_s.im == 1) {
+			seq_printf(m,
+				   "Power level %d:\n"
+				   "\tentry_latency       : %d cycles\n"
+				   "\texit_latency        : %d cycles\n"
+				   "\tpower consumption   : %d mW\n"
+				   "\tCache+TLB coherency : %s\n", i,
+				   halt_info[i].pal_power_mgmt_info_s.entry_latency,
+				   halt_info[i].pal_power_mgmt_info_s.exit_latency,
+				   halt_info[i].pal_power_mgmt_info_s.power_consumption,
+				   halt_info[i].pal_power_mgmt_info_s.co ? "Yes" : "No");
+		} else {
+			seq_printf(m,"Power level %d: not implemented\n", i);
+		}
+	}
+	return 0;
+}
+
+static int cache_info(struct seq_file *m)
+{
+	unsigned long i, levels, unique_caches;
+	pal_cache_config_info_t cci;
+	int j, k;
+	long status;
+
+	if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
+		printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
+		return 0;
+	}
+
+	seq_printf(m, "Cache levels  : %ld\nUnique caches : %ld\n\n",
+		   levels, unique_caches);
+
+	for (i=0; i < levels; i++) {
+		for (j=2; j >0 ; j--) {
+			/* even without unification some level may not be present */
+			if ((status=ia64_pal_cache_config_info(i,j, &cci)) != 0)
+				continue;
+
+			seq_printf(m,
+				   "%s Cache level %lu:\n"
+				   "\tSize           : %u bytes\n"
+				   "\tAttributes     : ",
+				   cache_types[j+cci.pcci_unified], i+1,
+				   cci.pcci_cache_size);
+
+			if (cci.pcci_unified)
+				seq_puts(m, "Unified ");
+
+			seq_printf(m, "%s\n", cache_mattrib[cci.pcci_cache_attr]);
+
+			seq_printf(m,
+				   "\tAssociativity  : %d\n"
+				   "\tLine size      : %d bytes\n"
+				   "\tStride         : %d bytes\n",
+				   cci.pcci_assoc,
+				   1<<cci.pcci_line_size,
+				   1<<cci.pcci_stride);
+			if (j == 1)
+				seq_puts(m, "\tStore latency  : N/A\n");
+			else
+				seq_printf(m, "\tStore latency  : %d cycle(s)\n",
+					   cci.pcci_st_latency);
+
+			seq_printf(m,
+				   "\tLoad latency   : %d cycle(s)\n"
+				   "\tStore hints    : ", cci.pcci_ld_latency);
+
+			for(k=0; k < 8; k++ ) {
+				if ( cci.pcci_st_hints & 0x1)
+					seq_printf(m, "[%s]", cache_st_hints[k]);
+				cci.pcci_st_hints >>=1;
+			}
+			seq_puts(m, "\n\tLoad hints     : ");
+
+			for(k=0; k < 8; k++ ) {
+				if (cci.pcci_ld_hints & 0x1)
+					seq_printf(m, "[%s]", cache_ld_hints[k]);
+				cci.pcci_ld_hints >>=1;
+			}
+			seq_printf(m,
+				   "\n\tAlias boundary : %d byte(s)\n"
+				   "\tTag LSB        : %d\n"
+				   "\tTag MSB        : %d\n",
+				   1<<cci.pcci_alias_boundary, cci.pcci_tag_lsb,
+				   cci.pcci_tag_msb);
+
+			/* when unified, data(j=2) is enough */
+			if (cci.pcci_unified)
+				break;
+		}
+	}
+	return 0;
+}
+
+
+static int vm_info(struct seq_file *m)
+{
+	u64 tr_pages =0, vw_pages=0, tc_pages;
+	u64 attrib;
+	pal_vm_info_1_u_t vm_info_1;
+	pal_vm_info_2_u_t vm_info_2;
+	pal_tc_info_u_t	tc_info;
+	ia64_ptce_info_t ptce;
+	const char *sep;
+	int i, j;
+	long status;
+
+	if ((status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2)) !=0) {
+		printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status);
+	} else {
+
+		seq_printf(m,
+		     "Physical Address Space         : %d bits\n"
+		     "Virtual Address Space          : %d bits\n"
+		     "Protection Key Registers(PKR)  : %d\n"
+		     "Implemented bits in PKR.key    : %d\n"
+		     "Hash Tag ID                    : 0x%x\n"
+		     "Size of RR.rid                 : %d\n"
+		     "Max Purges                     : ",
+		     vm_info_1.pal_vm_info_1_s.phys_add_size,
+		     vm_info_2.pal_vm_info_2_s.impl_va_msb+1,
+		     vm_info_1.pal_vm_info_1_s.max_pkr+1,
+		     vm_info_1.pal_vm_info_1_s.key_size,
+		     vm_info_1.pal_vm_info_1_s.hash_tag_id,
+		     vm_info_2.pal_vm_info_2_s.rid_size);
+		if (vm_info_2.pal_vm_info_2_s.max_purges == PAL_MAX_PURGES)
+			seq_puts(m, "unlimited\n");
+		else
+			seq_printf(m, "%d\n",
+		     		vm_info_2.pal_vm_info_2_s.max_purges ?
+				vm_info_2.pal_vm_info_2_s.max_purges : 1);
+	}
+
+	if (ia64_pal_mem_attrib(&attrib) == 0) {
+		seq_puts(m, "Supported memory attributes    : ");
+		sep = "";
+		for (i = 0; i < 8; i++) {
+			if (attrib & (1 << i)) {
+				seq_printf(m, "%s%s", sep, mem_attrib[i]);
+				sep = ", ";
+			}
+		}
+		seq_putc(m, '\n');
+	}
+
+	if ((status = ia64_pal_vm_page_size(&tr_pages, &vw_pages)) !=0) {
+		printk(KERN_ERR "ia64_pal_vm_page_size=%ld\n", status);
+	} else {
+
+		seq_printf(m,
+			   "\nTLB walker                     : %simplemented\n"
+			   "Number of DTR                  : %d\n"
+			   "Number of ITR                  : %d\n"
+			   "TLB insertable page sizes      : ",
+			   vm_info_1.pal_vm_info_1_s.vw ? "" : "not ",
+			   vm_info_1.pal_vm_info_1_s.max_dtr_entry+1,
+			   vm_info_1.pal_vm_info_1_s.max_itr_entry+1);
+
+		bitvector_process(m, tr_pages);
+
+		seq_puts(m, "\nTLB purgeable page sizes       : ");
+
+		bitvector_process(m, vw_pages);
+	}
+
+	if ((status = ia64_get_ptce(&ptce)) != 0) {
+		printk(KERN_ERR "ia64_get_ptce=%ld\n", status);
+	} else {
+		seq_printf(m,
+		     "\nPurge base address             : 0x%016lx\n"
+		     "Purge outer loop count         : %d\n"
+		     "Purge inner loop count         : %d\n"
+		     "Purge outer loop stride        : %d\n"
+		     "Purge inner loop stride        : %d\n",
+		     ptce.base, ptce.count[0], ptce.count[1],
+		     ptce.stride[0], ptce.stride[1]);
+
+		seq_printf(m,
+		     "TC Levels                      : %d\n"
+		     "Unique TC(s)                   : %d\n",
+		     vm_info_1.pal_vm_info_1_s.num_tc_levels,
+		     vm_info_1.pal_vm_info_1_s.max_unique_tcs);
+
+		for(i=0; i < vm_info_1.pal_vm_info_1_s.num_tc_levels; i++) {
+			for (j=2; j>0 ; j--) {
+				tc_pages = 0; /* just in case */
+
+				/* even without unification, some levels may not be present */
+				if ((status=ia64_pal_vm_info(i,j, &tc_info, &tc_pages)) != 0)
+					continue;
+
+				seq_printf(m,
+				     "\n%s Translation Cache Level %d:\n"
+				     "\tHash sets           : %d\n"
+				     "\tAssociativity       : %d\n"
+				     "\tNumber of entries   : %d\n"
+				     "\tFlags               : ",
+				     cache_types[j+tc_info.tc_unified], i+1,
+				     tc_info.tc_num_sets,
+				     tc_info.tc_associativity,
+				     tc_info.tc_num_entries);
+
+				if (tc_info.tc_pf)
+					seq_puts(m, "PreferredPageSizeOptimized ");
+				if (tc_info.tc_unified)
+					seq_puts(m, "Unified ");
+				if (tc_info.tc_reduce_tr)
+					seq_puts(m, "TCReduction");
+
+				seq_puts(m, "\n\tSupported page sizes: ");
+
+				bitvector_process(m, tc_pages);
+
+				/* when unified date (j=2) is enough */
+				if (tc_info.tc_unified)
+					break;
+			}
+		}
+	}
+
+	seq_putc(m, '\n');
+	return 0;
+}
+
+
+static int register_info(struct seq_file *m)
+{
+	u64 reg_info[2];
+	u64 info;
+	unsigned long phys_stacked;
+	pal_hints_u_t hints;
+	unsigned long iregs, dregs;
+	static const char * const info_type[] = {
+		"Implemented AR(s)",
+		"AR(s) with read side-effects",
+		"Implemented CR(s)",
+		"CR(s) with read side-effects",
+	};
+
+	for(info=0; info < 4; info++) {
+		if (ia64_pal_register_info(info, &reg_info[0], &reg_info[1]) != 0)
+			return 0;
+		seq_printf(m, "%-32s : ", info_type[info]);
+		bitregister_process(m, reg_info, 128);
+		seq_putc(m, '\n');
+	}
+
+	if (ia64_pal_rse_info(&phys_stacked, &hints) == 0)
+		seq_printf(m,
+			   "RSE stacked physical registers   : %ld\n"
+			   "RSE load/store hints             : %ld (%s)\n",
+			   phys_stacked, hints.ph_data,
+			   hints.ph_data < RSE_HINTS_COUNT ? rse_hints[hints.ph_data]: "(??)");
+
+	if (ia64_pal_debug_info(&iregs, &dregs))
+		return 0;
+
+	seq_printf(m,
+		   "Instruction debug register pairs : %ld\n"
+		   "Data debug register pairs        : %ld\n", iregs, dregs);
+
+	return 0;
+}
+
+static const char *const proc_features_0[]={		/* Feature set 0 */
+	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
+	NULL,NULL,NULL,NULL,NULL,NULL,NULL, NULL,NULL,
+	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
+	NULL,NULL,NULL,NULL,NULL, NULL,NULL,NULL,NULL,
+	"Unimplemented instruction address fault",
+	"INIT, PMI, and LINT pins",
+	"Simple unimplemented instr addresses",
+	"Variable P-state performance",
+	"Virtual machine features implemented",
+	"XIP,XPSR,XFS implemented",
+	"XR1-XR3 implemented",
+	"Disable dynamic predicate prediction",
+	"Disable processor physical number",
+	"Disable dynamic data cache prefetch",
+	"Disable dynamic inst cache prefetch",
+	"Disable dynamic branch prediction",
+	NULL, NULL, NULL, NULL,
+	"Disable P-states",
+	"Enable MCA on Data Poisoning",
+	"Enable vmsw instruction",
+	"Enable extern environmental notification",
+	"Disable BINIT on processor time-out",
+	"Disable dynamic power management (DPM)",
+	"Disable coherency",
+	"Disable cache",
+	"Enable CMCI promotion",
+	"Enable MCA to BINIT promotion",
+	"Enable MCA promotion",
+	"Enable BERR promotion"
+};
+
+static const char *const proc_features_16[]={		/* Feature set 16 */
+	"Disable ETM",
+	"Enable ETM",
+	"Enable MCA on half-way timer",
+	"Enable snoop WC",
+	NULL,
+	"Enable Fast Deferral",
+	"Disable MCA on memory aliasing",
+	"Enable RSB",
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	"DP system processor",
+	"Low Voltage",
+	"HT supported",
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL, NULL
+};
+
+static const char *const *const proc_features[]={
+	proc_features_0,
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL,
+	proc_features_16,
+	NULL, NULL, NULL, NULL,
+};
+
+static void feature_set_info(struct seq_file *m, u64 avail, u64 status, u64 control,
+			     unsigned long set)
+{
+	const char *const *vf, *const *v;
+	int i;
+
+	vf = v = proc_features[set];
+	for(i=0; i < 64; i++, avail >>=1, status >>=1, control >>=1) {
+
+		if (!(control))		/* No remaining bits set */
+			break;
+		if (!(avail & 0x1))	/* Print only bits that are available */
+			continue;
+		if (vf)
+			v = vf + i;
+		if ( v && *v ) {
+			seq_printf(m, "%-40s : %s %s\n", *v,
+				avail & 0x1 ? (status & 0x1 ?
+					      "On " : "Off"): "",
+				avail & 0x1 ? (control & 0x1 ?
+						"Ctrl" : "NoCtrl"): "");
+		} else {
+			seq_printf(m, "Feature set %2ld bit %2d\t\t\t"
+					" : %s %s\n",
+				set, i,
+				avail & 0x1 ? (status & 0x1 ?
+						"On " : "Off"): "",
+				avail & 0x1 ? (control & 0x1 ?
+						"Ctrl" : "NoCtrl"): "");
+		}
+	}
+}
+
+static int processor_info(struct seq_file *m)
+{
+	u64 avail=1, status=1, control=1, feature_set=0;
+	s64 ret;
+
+	do {
+		ret = ia64_pal_proc_get_features(&avail, &status, &control,
+						feature_set);
+		if (ret < 0)
+			return 0;
+
+		if (ret == 1) {
+			feature_set++;
+			continue;
+		}
+
+		feature_set_info(m, avail, status, control, feature_set);
+		feature_set++;
+	} while(1);
+
+	return 0;
+}
+
+static const char *const bus_features[]={
+	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
+	NULL,NULL,NULL,NULL,NULL,NULL,NULL, NULL,NULL,
+	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
+	NULL,NULL,
+	"Request  Bus Parking",
+	"Bus Lock Mask",
+	"Enable Half Transfer",
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL,
+	"Enable Cache Line Repl. Shared",
+	"Enable Cache Line Repl. Exclusive",
+	"Disable Transaction Queuing",
+	"Disable Response Error Checking",
+	"Disable Bus Error Checking",
+	"Disable Bus Requester Internal Error Signalling",
+	"Disable Bus Requester Error Signalling",
+	"Disable Bus Initialization Event Checking",
+	"Disable Bus Initialization Event Signalling",
+	"Disable Bus Address Error Checking",
+	"Disable Bus Address Error Signalling",
+	"Disable Bus Data Error Checking"
+};
+
+
+static int bus_info(struct seq_file *m)
+{
+	const char *const *v = bus_features;
+	pal_bus_features_u_t av, st, ct;
+	u64 avail, status, control;
+	int i;
+	s64 ret;
+
+	if ((ret=ia64_pal_bus_get_features(&av, &st, &ct)) != 0)
+		return 0;
+
+	avail   = av.pal_bus_features_val;
+	status  = st.pal_bus_features_val;
+	control = ct.pal_bus_features_val;
+
+	for(i=0; i < 64; i++, v++, avail >>=1, status >>=1, control >>=1) {
+		if ( ! *v )
+			continue;
+		seq_printf(m, "%-48s : %s%s %s\n", *v,
+			   avail & 0x1 ? "" : "NotImpl",
+			   avail & 0x1 ? (status  & 0x1 ? "On" : "Off"): "",
+			   avail & 0x1 ? (control & 0x1 ? "Ctrl" : "NoCtrl"): "");
+	}
+	return 0;
+}
+
+static int version_info(struct seq_file *m)
+{
+	pal_version_u_t min_ver, cur_ver;
+
+	if (ia64_pal_version(&min_ver, &cur_ver) != 0)
+		return 0;
+
+	seq_printf(m,
+		   "PAL_vendor : 0x%02x (min=0x%02x)\n"
+		   "PAL_A      : %02x.%02x (min=%02x.%02x)\n"
+		   "PAL_B      : %02x.%02x (min=%02x.%02x)\n",
+		   cur_ver.pal_version_s.pv_pal_vendor,
+		   min_ver.pal_version_s.pv_pal_vendor,
+		   cur_ver.pal_version_s.pv_pal_a_model,
+		   cur_ver.pal_version_s.pv_pal_a_rev,
+		   min_ver.pal_version_s.pv_pal_a_model,
+		   min_ver.pal_version_s.pv_pal_a_rev,
+		   cur_ver.pal_version_s.pv_pal_b_model,
+		   cur_ver.pal_version_s.pv_pal_b_rev,
+		   min_ver.pal_version_s.pv_pal_b_model,
+		   min_ver.pal_version_s.pv_pal_b_rev);
+	return 0;
+}
+
+static int frequency_info(struct seq_file *m)
+{
+	struct pal_freq_ratio proc, itc, bus;
+	unsigned long base;
+
+	if (ia64_pal_freq_base(&base) == -1)
+		seq_puts(m, "Output clock            : not implemented\n");
+	else
+		seq_printf(m, "Output clock            : %ld ticks/s\n", base);
+
+	if (ia64_pal_freq_ratios(&proc, &bus, &itc) != 0) return 0;
+
+	seq_printf(m,
+		     "Processor/Clock ratio   : %d/%d\n"
+		     "Bus/Clock ratio         : %d/%d\n"
+		     "ITC/Clock ratio         : %d/%d\n",
+		     proc.num, proc.den, bus.num, bus.den, itc.num, itc.den);
+	return 0;
+}
+
+static int tr_info(struct seq_file *m)
+{
+	long status;
+	pal_tr_valid_u_t tr_valid;
+	u64 tr_buffer[4];
+	pal_vm_info_1_u_t vm_info_1;
+	pal_vm_info_2_u_t vm_info_2;
+	unsigned long i, j;
+	unsigned long max[3], pgm;
+	struct ifa_reg {
+		unsigned long valid:1;
+		unsigned long ig:11;
+		unsigned long vpn:52;
+	} *ifa_reg;
+	struct itir_reg {
+		unsigned long rv1:2;
+		unsigned long ps:6;
+		unsigned long key:24;
+		unsigned long rv2:32;
+	} *itir_reg;
+	struct gr_reg {
+		unsigned long p:1;
+		unsigned long rv1:1;
+		unsigned long ma:3;
+		unsigned long a:1;
+		unsigned long d:1;
+		unsigned long pl:2;
+		unsigned long ar:3;
+		unsigned long ppn:38;
+		unsigned long rv2:2;
+		unsigned long ed:1;
+		unsigned long ig:11;
+	} *gr_reg;
+	struct rid_reg {
+		unsigned long ig1:1;
+		unsigned long rv1:1;
+		unsigned long ig2:6;
+		unsigned long rid:24;
+		unsigned long rv2:32;
+	} *rid_reg;
+
+	if ((status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2)) !=0) {
+		printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status);
+		return 0;
+	}
+	max[0] = vm_info_1.pal_vm_info_1_s.max_itr_entry+1;
+	max[1] = vm_info_1.pal_vm_info_1_s.max_dtr_entry+1;
+
+	for (i=0; i < 2; i++ ) {
+		for (j=0; j < max[i]; j++) {
+
+		status = ia64_pal_tr_read(j, i, tr_buffer, &tr_valid);
+		if (status != 0) {
+			printk(KERN_ERR "palinfo: pal call failed on tr[%lu:%lu]=%ld\n",
+			       i, j, status);
+			continue;
+		}
+
+		ifa_reg  = (struct ifa_reg *)&tr_buffer[2];
+
+		if (ifa_reg->valid == 0)
+			continue;
+
+		gr_reg   = (struct gr_reg *)tr_buffer;
+		itir_reg = (struct itir_reg *)&tr_buffer[1];
+		rid_reg  = (struct rid_reg *)&tr_buffer[3];
+
+		pgm	 = -1 << (itir_reg->ps - 12);
+		seq_printf(m,
+			   "%cTR%lu: av=%d pv=%d dv=%d mv=%d\n"
+			   "\tppn  : 0x%lx\n"
+			   "\tvpn  : 0x%lx\n"
+			   "\tps   : ",
+			   "ID"[i], j,
+			   tr_valid.pal_tr_valid_s.access_rights_valid,
+			   tr_valid.pal_tr_valid_s.priv_level_valid,
+			   tr_valid.pal_tr_valid_s.dirty_bit_valid,
+			   tr_valid.pal_tr_valid_s.mem_attr_valid,
+			   (gr_reg->ppn & pgm)<< 12, (ifa_reg->vpn & pgm)<< 12);
+
+		bitvector_process(m, 1<< itir_reg->ps);
+
+		seq_printf(m,
+			   "\n\tpl   : %d\n"
+			   "\tar   : %d\n"
+			   "\trid  : %x\n"
+			   "\tp    : %d\n"
+			   "\tma   : %d\n"
+			   "\td    : %d\n",
+			   gr_reg->pl, gr_reg->ar, rid_reg->rid, gr_reg->p, gr_reg->ma,
+			   gr_reg->d);
+		}
+	}
+	return 0;
+}
+
+
+
+/*
+ * List {name,function} pairs for every entry in /proc/palinfo/cpu*
+ */
+static const palinfo_entry_t palinfo_entries[]={
+	{ "version_info",	version_info, },
+	{ "vm_info",		vm_info, },
+	{ "cache_info",		cache_info, },
+	{ "power_info",		power_info, },
+	{ "register_info",	register_info, },
+	{ "processor_info",	processor_info, },
+	{ "frequency_info",	frequency_info, },
+	{ "bus_info",		bus_info },
+	{ "tr_info",		tr_info, }
+};
+
+#define NR_PALINFO_ENTRIES	(int) ARRAY_SIZE(palinfo_entries)
+
+static struct proc_dir_entry *palinfo_dir;
+
+/*
+ * This data structure is used to pass which cpu,function is being requested
+ * It must fit in a 64bit quantity to be passed to the proc callback routine
+ *
+ * In SMP mode, when we get a request for another CPU, we must call that
+ * other CPU using IPI and wait for the result before returning.
+ */
+typedef union {
+	u64 value;
+	struct {
+		unsigned	req_cpu: 32;	/* for which CPU this info is */
+		unsigned	func_id: 32;	/* which function is requested */
+	} pal_func_cpu;
+} pal_func_cpu_u_t;
+
+#define req_cpu	pal_func_cpu.req_cpu
+#define func_id pal_func_cpu.func_id
+
+#ifdef CONFIG_SMP
+
+/*
+ * used to hold information about final function to call
+ */
+typedef struct {
+	palinfo_func_t	func;	/* pointer to function to call */
+	struct seq_file *m;	/* buffer to store results */
+	int		ret;	/* return value from call */
+} palinfo_smp_data_t;
+
+
+/*
+ * this function does the actual final call and he called
+ * from the smp code, i.e., this is the palinfo callback routine
+ */
+static void
+palinfo_smp_call(void *info)
+{
+	palinfo_smp_data_t *data = (palinfo_smp_data_t *)info;
+	data->ret = (*data->func)(data->m);
+}
+
+/*
+ * function called to trigger the IPI, we need to access a remote CPU
+ * Return:
+ *	0 : error or nothing to output
+ *	otherwise how many bytes in the "page" buffer were written
+ */
+static
+int palinfo_handle_smp(struct seq_file *m, pal_func_cpu_u_t *f)
+{
+	palinfo_smp_data_t ptr;
+	int ret;
+
+	ptr.func = palinfo_entries[f->func_id].proc_read;
+	ptr.m = m;
+	ptr.ret  = 0; /* just in case */
+
+
+	/* will send IPI to other CPU and wait for completion of remote call */
+	if ((ret=smp_call_function_single(f->req_cpu, palinfo_smp_call, &ptr, 1))) {
+		printk(KERN_ERR "palinfo: remote CPU call from %d to %d on function %d: "
+		       "error %d\n", smp_processor_id(), f->req_cpu, f->func_id, ret);
+		return 0;
+	}
+	return ptr.ret;
+}
+#else /* ! CONFIG_SMP */
+static
+int palinfo_handle_smp(struct seq_file *m, pal_func_cpu_u_t *f)
+{
+	printk(KERN_ERR "palinfo: should not be called with non SMP kernel\n");
+	return 0;
+}
+#endif /* CONFIG_SMP */
+
+/*
+ * Entry point routine: all calls go through this function
+ */
+static int proc_palinfo_show(struct seq_file *m, void *v)
+{
+	pal_func_cpu_u_t *f = (pal_func_cpu_u_t *)&m->private;
+
+	/*
+	 * in SMP mode, we may need to call another CPU to get correct
+	 * information. PAL, by definition, is processor specific
+	 */
+	if (f->req_cpu == get_cpu())
+		(*palinfo_entries[f->func_id].proc_read)(m);
+	else
+		palinfo_handle_smp(m, f);
+
+	put_cpu();
+	return 0;
+}
+
+static int palinfo_add_proc(unsigned int cpu)
+{
+	pal_func_cpu_u_t f;
+	struct proc_dir_entry *cpu_dir;
+	int j;
+	char cpustr[3+4+1];	/* cpu numbers are up to 4095 on itanic */
+	sprintf(cpustr, "cpu%d", cpu);
+
+	cpu_dir = proc_mkdir(cpustr, palinfo_dir);
+	if (!cpu_dir)
+		return -EINVAL;
+
+	f.req_cpu = cpu;
+
+	for (j=0; j < NR_PALINFO_ENTRIES; j++) {
+		f.func_id = j;
+		proc_create_single_data(palinfo_entries[j].name, 0, cpu_dir,
+				proc_palinfo_show, (void *)f.value);
+	}
+	return 0;
+}
+
+static int palinfo_del_proc(unsigned int hcpu)
+{
+	char cpustr[3+4+1];	/* cpu numbers are up to 4095 on itanic */
+
+	sprintf(cpustr, "cpu%d", hcpu);
+	remove_proc_subtree(cpustr, palinfo_dir);
+	return 0;
+}
+
+static enum cpuhp_state hp_online;
+
+static int __init palinfo_init(void)
+{
+	int i = 0;
+
+	printk(KERN_INFO "PAL Information Facility v%s\n", PALINFO_VERSION);
+	palinfo_dir = proc_mkdir("pal", NULL);
+	if (!palinfo_dir)
+		return -ENOMEM;
+
+	i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/palinfo:online",
+			      palinfo_add_proc, palinfo_del_proc);
+	if (i < 0) {
+		remove_proc_subtree("pal", NULL);
+		return i;
+	}
+	hp_online = i;
+	return 0;
+}
+
+static void __exit palinfo_exit(void)
+{
+	cpuhp_remove_state(hp_online);
+	remove_proc_subtree("pal", NULL);
+}
+
+module_init(palinfo_init);
+module_exit(palinfo_exit);
diff --git a/arch/ia64/kernel/patch.c b/arch/ia64/kernel/patch.c
new file mode 100644
index 000000000..7f21a8c57
--- /dev/null
+++ b/arch/ia64/kernel/patch.c
@@ -0,0 +1,237 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Instruction-patching support.
+ *
+ * Copyright (C) 2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+#include <linux/init.h>
+#include <linux/string.h>
+
+#include <asm/patch.h>
+#include <asm/processor.h>
+#include <asm/sections.h>
+#include <asm/unistd.h>
+
+/*
+ * This was adapted from code written by Tony Luck:
+ *
+ * The 64-bit value in a "movl reg=value" is scattered between the two words of the bundle
+ * like this:
+ *
+ * 6  6         5         4         3         2         1
+ * 3210987654321098765432109876543210987654321098765432109876543210
+ * ABBBBBBBBBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCCCDEEEEEFFFFFFFFFGGGGGGG
+ *
+ * CCCCCCCCCCCCCCCCCCxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+ * xxxxAFFFFFFFFFEEEEEDxGGGGGGGxxxxxxxxxxxxxBBBBBBBBBBBBBBBBBBBBBBB
+ */
+static u64
+get_imm64 (u64 insn_addr)
+{
+	u64 *p = (u64 *) (insn_addr & -16);	/* mask out slot number */
+
+	return ( (p[1] & 0x0800000000000000UL) << 4)  | /*A*/
+		((p[1] & 0x00000000007fffffUL) << 40) | /*B*/
+		((p[0] & 0xffffc00000000000UL) >> 24) | /*C*/
+		((p[1] & 0x0000100000000000UL) >> 23) | /*D*/
+		((p[1] & 0x0003e00000000000UL) >> 29) | /*E*/
+		((p[1] & 0x07fc000000000000UL) >> 43) | /*F*/
+		((p[1] & 0x000007f000000000UL) >> 36);  /*G*/
+}
+
+/* Patch instruction with "val" where "mask" has 1 bits. */
+void
+ia64_patch (u64 insn_addr, u64 mask, u64 val)
+{
+	u64 m0, m1, v0, v1, b0, b1, *b = (u64 *) (insn_addr & -16);
+#	define insn_mask ((1UL << 41) - 1)
+	unsigned long shift;
+
+	b0 = b[0]; b1 = b[1];
+	shift = 5 + 41 * (insn_addr % 16); /* 5 bits of template, then 3 x 41-bit instructions */
+	if (shift >= 64) {
+		m1 = mask << (shift - 64);
+		v1 = val << (shift - 64);
+	} else {
+		m0 = mask << shift; m1 = mask >> (64 - shift);
+		v0 = val  << shift; v1 = val >> (64 - shift);
+		b[0] = (b0 & ~m0) | (v0 & m0);
+	}
+	b[1] = (b1 & ~m1) | (v1 & m1);
+}
+
+void
+ia64_patch_imm64 (u64 insn_addr, u64 val)
+{
+	/* The assembler may generate offset pointing to either slot 1
+	   or slot 2 for a long (2-slot) instruction, occupying slots 1
+	   and 2.  */
+  	insn_addr &= -16UL;
+	ia64_patch(insn_addr + 2,
+		   0x01fffefe000UL, (  ((val & 0x8000000000000000UL) >> 27) /* bit 63 -> 36 */
+				     | ((val & 0x0000000000200000UL) <<  0) /* bit 21 -> 21 */
+				     | ((val & 0x00000000001f0000UL) <<  6) /* bit 16 -> 22 */
+				     | ((val & 0x000000000000ff80UL) << 20) /* bit  7 -> 27 */
+				     | ((val & 0x000000000000007fUL) << 13) /* bit  0 -> 13 */));
+	ia64_patch(insn_addr + 1, 0x1ffffffffffUL, val >> 22);
+}
+
+void
+ia64_patch_imm60 (u64 insn_addr, u64 val)
+{
+	/* The assembler may generate offset pointing to either slot 1
+	   or slot 2 for a long (2-slot) instruction, occupying slots 1
+	   and 2.  */
+  	insn_addr &= -16UL;
+	ia64_patch(insn_addr + 2,
+		   0x011ffffe000UL, (  ((val & 0x0800000000000000UL) >> 23) /* bit 59 -> 36 */
+				     | ((val & 0x00000000000fffffUL) << 13) /* bit  0 -> 13 */));
+	ia64_patch(insn_addr + 1, 0x1fffffffffcUL, val >> 18);
+}
+
+/*
+ * We need sometimes to load the physical address of a kernel
+ * object.  Often we can convert the virtual address to physical
+ * at execution time, but sometimes (either for performance reasons
+ * or during error recovery) we cannot to this.  Patch the marked
+ * bundles to load the physical address.
+ */
+void __init
+ia64_patch_vtop (unsigned long start, unsigned long end)
+{
+	s32 *offp = (s32 *) start;
+	u64 ip;
+
+	while (offp < (s32 *) end) {
+		ip = (u64) offp + *offp;
+
+		/* replace virtual address with corresponding physical address: */
+		ia64_patch_imm64(ip, ia64_tpa(get_imm64(ip)));
+		ia64_fc((void *) ip);
+		++offp;
+	}
+	ia64_sync_i();
+	ia64_srlz_i();
+}
+
+/*
+ * Disable the RSE workaround by turning the conditional branch
+ * that we tagged in each place the workaround was used into an
+ * unconditional branch.
+ */
+void __init
+ia64_patch_rse (unsigned long start, unsigned long end)
+{
+	s32 *offp = (s32 *) start;
+	u64 ip, *b;
+
+	while (offp < (s32 *) end) {
+		ip = (u64) offp + *offp;
+
+		b = (u64 *)(ip & -16);
+		b[1] &= ~0xf800000L;
+		ia64_fc((void *) ip);
+		++offp;
+	}
+	ia64_sync_i();
+	ia64_srlz_i();
+}
+
+void __init
+ia64_patch_mckinley_e9 (unsigned long start, unsigned long end)
+{
+	static int first_time = 1;
+	int need_workaround;
+	s32 *offp = (s32 *) start;
+	u64 *wp;
+
+	need_workaround = (local_cpu_data->family == 0x1f && local_cpu_data->model == 0);
+
+	if (first_time) {
+		first_time = 0;
+		if (need_workaround)
+			printk(KERN_INFO "Leaving McKinley Errata 9 workaround enabled\n");
+	}
+	if (need_workaround)
+		return;
+
+	while (offp < (s32 *) end) {
+		wp = (u64 *) ia64_imva((char *) offp + *offp);
+		wp[0] = 0x0000000100000011UL; /* nop.m 0; nop.i 0; br.ret.sptk.many b6 */
+		wp[1] = 0x0084006880000200UL;
+		wp[2] = 0x0000000100000000UL; /* nop.m 0; nop.i 0; nop.i 0 */
+		wp[3] = 0x0004000000000200UL;
+		ia64_fc(wp); ia64_fc(wp + 2);
+		++offp;
+	}
+	ia64_sync_i();
+	ia64_srlz_i();
+}
+
+static void __init
+patch_fsyscall_table (unsigned long start, unsigned long end)
+{
+	extern unsigned long fsyscall_table[NR_syscalls];
+	s32 *offp = (s32 *) start;
+	u64 ip;
+
+	while (offp < (s32 *) end) {
+		ip = (u64) ia64_imva((char *) offp + *offp);
+		ia64_patch_imm64(ip, (u64) fsyscall_table);
+		ia64_fc((void *) ip);
+		++offp;
+	}
+	ia64_sync_i();
+	ia64_srlz_i();
+}
+
+static void __init
+patch_brl_fsys_bubble_down (unsigned long start, unsigned long end)
+{
+	extern char fsys_bubble_down[];
+	s32 *offp = (s32 *) start;
+	u64 ip;
+
+	while (offp < (s32 *) end) {
+		ip = (u64) offp + *offp;
+		ia64_patch_imm60((u64) ia64_imva((void *) ip),
+				 (u64) (fsys_bubble_down - (ip & -16)) / 16);
+		ia64_fc((void *) ip);
+		++offp;
+	}
+	ia64_sync_i();
+	ia64_srlz_i();
+}
+
+void __init
+ia64_patch_gate (void)
+{
+#	define START(name)	((unsigned long) __start_gate_##name##_patchlist)
+#	define END(name)	((unsigned long)__end_gate_##name##_patchlist)
+
+	patch_fsyscall_table(START(fsyscall), END(fsyscall));
+	patch_brl_fsys_bubble_down(START(brl_fsys_bubble_down), END(brl_fsys_bubble_down));
+	ia64_patch_vtop(START(vtop), END(vtop));
+	ia64_patch_mckinley_e9(START(mckinley_e9), END(mckinley_e9));
+}
+
+void ia64_patch_phys_stack_reg(unsigned long val)
+{
+	s32 * offp = (s32 *) __start___phys_stack_reg_patchlist;
+	s32 * end = (s32 *) __end___phys_stack_reg_patchlist;
+	u64 ip, mask, imm;
+
+	/* see instruction format A4: adds r1 = imm13, r3 */
+	mask = (0x3fUL << 27) | (0x7f << 13);
+	imm = (((val >> 7) & 0x3f) << 27) | (val & 0x7f) << 13;
+
+	while (offp < end) {
+		ip = (u64) offp + *offp;
+		ia64_patch(ip, mask, imm);
+		ia64_fc((void *)ip);
+		++offp;
+	}
+	ia64_sync_i();
+	ia64_srlz_i();
+}
diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
new file mode 100644
index 000000000..c90221733
--- /dev/null
+++ b/arch/ia64/kernel/pci-dma.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Dynamic DMA mapping support.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/dmar.h>
+#include <asm/iommu.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <asm/page.h>
+
+int no_iommu __read_mostly;
+#ifdef CONFIG_IOMMU_DEBUG
+int force_iommu __read_mostly = 1;
+#else
+int force_iommu __read_mostly;
+#endif
+
+static int __init pci_iommu_init(void)
+{
+	if (iommu_detected)
+		intel_iommu_init();
+
+	return 0;
+}
+
+/* Must execute after PCI subsystem */
+fs_initcall(pci_iommu_init);
diff --git a/arch/ia64/kernel/perfmon_itanium.h b/arch/ia64/kernel/perfmon_itanium.h
new file mode 100644
index 000000000..dbd04028a
--- /dev/null
+++ b/arch/ia64/kernel/perfmon_itanium.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This file contains the Itanium PMU register description tables
+ * and pmc checker.
+ *
+ * Copyright (C) 2002-2003  Hewlett Packard Co
+ *               Stephane Eranian <eranian@hpl.hp.com>
+ */
+static int pfm_ita_pmc_check(struct task_struct *task, pfm_context_t *ctx, unsigned int cnum, unsigned long *val, struct pt_regs *regs);
+
+static pfm_reg_desc_t pfm_ita_pmc_desc[PMU_MAX_PMCS]={
+/* pmc0  */ { PFM_REG_CONTROL , 0, 0x1UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc1  */ { PFM_REG_CONTROL , 0, 0x0UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc2  */ { PFM_REG_CONTROL , 0, 0x0UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc3  */ { PFM_REG_CONTROL , 0, 0x0UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc4  */ { PFM_REG_COUNTING, 6, 0x0UL, -1UL, NULL, NULL, {RDEP(4),0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc5  */ { PFM_REG_COUNTING, 6, 0x0UL, -1UL, NULL, NULL, {RDEP(5),0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc6  */ { PFM_REG_COUNTING, 6, 0x0UL, -1UL, NULL, NULL, {RDEP(6),0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc7  */ { PFM_REG_COUNTING, 6, 0x0UL, -1UL, NULL, NULL, {RDEP(7),0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc8  */ { PFM_REG_CONFIG  , 0, 0xf00000003ffffff8UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc9  */ { PFM_REG_CONFIG  , 0, 0xf00000003ffffff8UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc10 */ { PFM_REG_MONITOR , 6, 0x0UL, -1UL, NULL, NULL, {RDEP(0)|RDEP(1),0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc11 */ { PFM_REG_MONITOR , 6, 0x0000000010000000UL, -1UL, NULL, pfm_ita_pmc_check, {RDEP(2)|RDEP(3)|RDEP(17),0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc12 */ { PFM_REG_MONITOR , 6, 0x0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(10)|RDEP(11)|RDEP(12)|RDEP(13)|RDEP(14)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+/* pmc13 */ { PFM_REG_CONFIG  , 0, 0x0003ffff00000001UL, -1UL, NULL, pfm_ita_pmc_check, {0UL,0UL, 0UL, 0UL}, {0UL,0UL, 0UL, 0UL}},
+	    { PFM_REG_END     , 0, 0x0UL, -1UL, NULL, NULL, {0,}, {0,}}, /* end marker */
+};
+
+static pfm_reg_desc_t pfm_ita_pmd_desc[PMU_MAX_PMDS]={
+/* pmd0  */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(1),0UL, 0UL, 0UL}, {RDEP(10),0UL, 0UL, 0UL}},
+/* pmd1  */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(0),0UL, 0UL, 0UL}, {RDEP(10),0UL, 0UL, 0UL}},
+/* pmd2  */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(3)|RDEP(17),0UL, 0UL, 0UL}, {RDEP(11),0UL, 0UL, 0UL}},
+/* pmd3  */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(2)|RDEP(17),0UL, 0UL, 0UL}, {RDEP(11),0UL, 0UL, 0UL}},
+/* pmd4  */ { PFM_REG_COUNTING, 0, 0UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {RDEP(4),0UL, 0UL, 0UL}},
+/* pmd5  */ { PFM_REG_COUNTING, 0, 0UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {RDEP(5),0UL, 0UL, 0UL}},
+/* pmd6  */ { PFM_REG_COUNTING, 0, 0UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {RDEP(6),0UL, 0UL, 0UL}},
+/* pmd7  */ { PFM_REG_COUNTING, 0, 0UL, -1UL, NULL, NULL, {0UL,0UL, 0UL, 0UL}, {RDEP(7),0UL, 0UL, 0UL}},
+/* pmd8  */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(9)|RDEP(10)|RDEP(11)|RDEP(12)|RDEP(13)|RDEP(14)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd9  */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(10)|RDEP(11)|RDEP(12)|RDEP(13)|RDEP(14)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd10 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(11)|RDEP(12)|RDEP(13)|RDEP(14)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd11 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(10)|RDEP(12)|RDEP(13)|RDEP(14)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd12 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(10)|RDEP(11)|RDEP(13)|RDEP(14)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd13 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(10)|RDEP(11)|RDEP(12)|RDEP(14)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd14 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(10)|RDEP(11)|RDEP(12)|RDEP(13)|RDEP(15)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd15 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(10)|RDEP(11)|RDEP(12)|RDEP(13)|RDEP(14)|RDEP(16),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd16 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(8)|RDEP(9)|RDEP(10)|RDEP(11)|RDEP(12)|RDEP(13)|RDEP(14)|RDEP(15),0UL, 0UL, 0UL}, {RDEP(12),0UL, 0UL, 0UL}},
+/* pmd17 */ { PFM_REG_BUFFER  , 0, 0UL, -1UL, NULL, NULL, {RDEP(2)|RDEP(3),0UL, 0UL, 0UL}, {RDEP(11),0UL, 0UL, 0UL}},
+	    { PFM_REG_END     , 0, 0UL, -1UL, NULL, NULL, {0,}, {0,}}, /* end marker */
+};
+
+static int
+pfm_ita_pmc_check(struct task_struct *task, pfm_context_t *ctx, unsigned int cnum, unsigned long *val, struct pt_regs *regs)
+{
+	int ret;
+	int is_loaded;
+
+	/* sanitfy check */
+	if (ctx == NULL) return -EINVAL;
+
+	is_loaded = ctx->ctx_state == PFM_CTX_LOADED || ctx->ctx_state == PFM_CTX_MASKED;
+
+	/*
+	 * we must clear the (instruction) debug registers if pmc13.ta bit is cleared
+	 * before they are written (fl_using_dbreg==0) to avoid picking up stale information.
+	 */
+	if (cnum == 13 && is_loaded && ((*val & 0x1) == 0UL) && ctx->ctx_fl_using_dbreg == 0) {
+
+		DPRINT(("pmc[%d]=0x%lx has active pmc13.ta cleared, clearing ibr\n", cnum, *val));
+
+		/* don't mix debug with perfmon */
+		if (task && (task->thread.flags & IA64_THREAD_DBG_VALID) != 0) return -EINVAL;
+
+		/*
+		 * a count of 0 will mark the debug registers as in use and also
+		 * ensure that they are properly cleared.
+		 */
+		ret = pfm_write_ibr_dbr(1, ctx, NULL, 0, regs);
+		if (ret) return ret;
+	}
+
+	/*
+	 * we must clear the (data) debug registers if pmc11.pt bit is cleared
+	 * before they are written (fl_using_dbreg==0) to avoid picking up stale information.
+	 */
+	if (cnum == 11 && is_loaded && ((*val >> 28)& 0x1) == 0 && ctx->ctx_fl_using_dbreg == 0) {
+
+		DPRINT(("pmc[%d]=0x%lx has active pmc11.pt cleared, clearing dbr\n", cnum, *val));
+
+		/* don't mix debug with perfmon */
+		if (task && (task->thread.flags & IA64_THREAD_DBG_VALID) != 0) return -EINVAL;
+
+		/*
+		 * a count of 0 will mark the debug registers as in use and also
+		 * ensure that they are properly cleared.
+		 */
+		ret = pfm_write_ibr_dbr(0, ctx, NULL, 0, regs);
+		if (ret) return ret;
+	}
+	return 0;
+}
+
+/*
+ * impl_pmcs, impl_pmds are computed at runtime to minimize errors!
+ */
+static pmu_config_t pmu_conf_ita={
+	.pmu_name      = "Itanium",
+	.pmu_family    = 0x7,
+	.ovfl_val      = (1UL << 32) - 1,
+	.pmd_desc      = pfm_ita_pmd_desc,
+	.pmc_desc      = pfm_ita_pmc_desc,
+	.num_ibrs      = 8,
+	.num_dbrs      = 8,
+	.use_rr_dbregs = 1, /* debug register are use for range retrictions */
+};
+
+
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
new file mode 100644
index 000000000..416305e55
--- /dev/null
+++ b/arch/ia64/kernel/process.c
@@ -0,0 +1,610 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Architecture-specific setup.
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * 04/11/17 Ashok Raj	<ashok.raj@intel.com> Added CPU Hotplug Support
+ *
+ * 2005-10-07 Keith Owens <kaos@sgi.com>
+ *	      Add notify_die() hooks.
+ */
+#include <linux/cpu.h>
+#include <linux/pm.h>
+#include <linux/elf.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/personality.h>
+#include <linux/reboot.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/hotplug.h>
+#include <linux/sched/task.h>
+#include <linux/sched/task_stack.h>
+#include <linux/stddef.h>
+#include <linux/thread_info.h>
+#include <linux/unistd.h>
+#include <linux/efi.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/kdebug.h>
+#include <linux/utsname.h>
+#include <linux/resume_user_mode.h>
+#include <linux/rcupdate.h>
+
+#include <asm/cpu.h>
+#include <asm/delay.h>
+#include <asm/elf.h>
+#include <asm/irq.h>
+#include <asm/kexec.h>
+#include <asm/processor.h>
+#include <asm/sal.h>
+#include <asm/switch_to.h>
+#include <asm/tlbflush.h>
+#include <linux/uaccess.h>
+#include <asm/unwind.h>
+#include <asm/user.h>
+#include <asm/xtp.h>
+
+#include "entry.h"
+
+#include "sigframe.h"
+
+void (*ia64_mark_idle)(int);
+
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
+EXPORT_SYMBOL(boot_option_idle_override);
+void (*pm_power_off) (void);
+EXPORT_SYMBOL(pm_power_off);
+
+static void
+ia64_do_show_stack (struct unw_frame_info *info, void *arg)
+{
+	unsigned long ip, sp, bsp;
+	const char *loglvl = arg;
+
+	printk("%s\nCall Trace:\n", loglvl);
+	do {
+		unw_get_ip(info, &ip);
+		if (ip == 0)
+			break;
+
+		unw_get_sp(info, &sp);
+		unw_get_bsp(info, &bsp);
+		printk("%s [<%016lx>] %pS\n"
+			 "                                sp=%016lx bsp=%016lx\n",
+			 loglvl, ip, (void *)ip, sp, bsp);
+	} while (unw_unwind(info) >= 0);
+}
+
+void
+show_stack (struct task_struct *task, unsigned long *sp, const char *loglvl)
+{
+	if (!task)
+		unw_init_running(ia64_do_show_stack, (void *)loglvl);
+	else {
+		struct unw_frame_info info;
+
+		unw_init_from_blocked_task(&info, task);
+		ia64_do_show_stack(&info, (void *)loglvl);
+	}
+}
+
+void
+show_regs (struct pt_regs *regs)
+{
+	unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;
+
+	print_modules();
+	printk("\n");
+	show_regs_print_info(KERN_DEFAULT);
+	printk("psr : %016lx ifs : %016lx ip  : [<%016lx>]    %s (%s)\n",
+	       regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(),
+	       init_utsname()->release);
+	printk("ip is at %pS\n", (void *)ip);
+	printk("unat: %016lx pfs : %016lx rsc : %016lx\n",
+	       regs->ar_unat, regs->ar_pfs, regs->ar_rsc);
+	printk("rnat: %016lx bsps: %016lx pr  : %016lx\n",
+	       regs->ar_rnat, regs->ar_bspstore, regs->pr);
+	printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n",
+	       regs->loadrs, regs->ar_ccv, regs->ar_fpsr);
+	printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd);
+	printk("b0  : %016lx b6  : %016lx b7  : %016lx\n", regs->b0, regs->b6, regs->b7);
+	printk("f6  : %05lx%016lx f7  : %05lx%016lx\n",
+	       regs->f6.u.bits[1], regs->f6.u.bits[0],
+	       regs->f7.u.bits[1], regs->f7.u.bits[0]);
+	printk("f8  : %05lx%016lx f9  : %05lx%016lx\n",
+	       regs->f8.u.bits[1], regs->f8.u.bits[0],
+	       regs->f9.u.bits[1], regs->f9.u.bits[0]);
+	printk("f10 : %05lx%016lx f11 : %05lx%016lx\n",
+	       regs->f10.u.bits[1], regs->f10.u.bits[0],
+	       regs->f11.u.bits[1], regs->f11.u.bits[0]);
+
+	printk("r1  : %016lx r2  : %016lx r3  : %016lx\n", regs->r1, regs->r2, regs->r3);
+	printk("r8  : %016lx r9  : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10);
+	printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13);
+	printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16);
+	printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19);
+	printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22);
+	printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25);
+	printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28);
+	printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31);
+
+	if (user_mode(regs)) {
+		/* print the stacked registers */
+		unsigned long val, *bsp, ndirty;
+		int i, sof, is_nat = 0;
+
+		sof = regs->cr_ifs & 0x7f;	/* size of frame */
+		ndirty = (regs->loadrs >> 19);
+		bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty);
+		for (i = 0; i < sof; ++i) {
+			get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i));
+			printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val,
+			       ((i == sof - 1) || (i % 3) == 2) ? "\n" : " ");
+		}
+	} else
+		show_stack(NULL, NULL, KERN_DEFAULT);
+}
+
+/* local support for deprecated console_print */
+void
+console_print(const char *s)
+{
+	printk(KERN_EMERG "%s", s);
+}
+
+void
+do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
+{
+	if (fsys_mode(current, &scr->pt)) {
+		/*
+		 * defer signal-handling etc. until we return to
+		 * privilege-level 0.
+		 */
+		if (!ia64_psr(&scr->pt)->lp)
+			ia64_psr(&scr->pt)->lp = 1;
+		return;
+	}
+
+	/* deal with pending signal delivery */
+	if (test_thread_flag(TIF_SIGPENDING) ||
+	    test_thread_flag(TIF_NOTIFY_SIGNAL)) {
+		local_irq_enable();	/* force interrupt enable */
+		ia64_do_signal(scr, in_syscall);
+	}
+
+	if (test_thread_flag(TIF_NOTIFY_RESUME)) {
+		local_irq_enable();	/* force interrupt enable */
+		resume_user_mode_work(&scr->pt);
+	}
+
+	/* copy user rbs to kernel rbs */
+	if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
+		local_irq_enable();	/* force interrupt enable */
+		ia64_sync_krbs();
+	}
+
+	local_irq_disable();	/* force interrupt disable */
+}
+
+static int __init nohalt_setup(char * str)
+{
+	cpu_idle_poll_ctrl(true);
+	return 1;
+}
+__setup("nohalt", nohalt_setup);
+
+#ifdef CONFIG_HOTPLUG_CPU
+/* We don't actually take CPU down, just spin without interrupts. */
+static inline void play_dead(void)
+{
+	unsigned int this_cpu = smp_processor_id();
+
+	/* Ack it */
+	__this_cpu_write(cpu_state, CPU_DEAD);
+
+	max_xtp();
+	local_irq_disable();
+	idle_task_exit();
+	ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]);
+	/*
+	 * The above is a point of no-return, the processor is
+	 * expected to be in SAL loop now.
+	 */
+	BUG();
+}
+#else
+static inline void play_dead(void)
+{
+	BUG();
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+void arch_cpu_idle_dead(void)
+{
+	play_dead();
+}
+
+void arch_cpu_idle(void)
+{
+	void (*mark_idle)(int) = ia64_mark_idle;
+
+#ifdef CONFIG_SMP
+	min_xtp();
+#endif
+	rmb();
+	if (mark_idle)
+		(*mark_idle)(1);
+
+	raw_safe_halt();
+
+	if (mark_idle)
+		(*mark_idle)(0);
+#ifdef CONFIG_SMP
+	normal_xtp();
+#endif
+}
+
+void
+ia64_save_extra (struct task_struct *task)
+{
+	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
+		ia64_save_debug_regs(&task->thread.dbr[0]);
+}
+
+void
+ia64_load_extra (struct task_struct *task)
+{
+	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
+		ia64_load_debug_regs(&task->thread.dbr[0]);
+}
+
+/*
+ * Copy the state of an ia-64 thread.
+ *
+ * We get here through the following  call chain:
+ *
+ *	from user-level:	from kernel:
+ *
+ *	<clone syscall>	        <some kernel call frames>
+ *	sys_clone		   :
+ *	kernel_clone		kernel_clone
+ *	copy_thread		copy_thread
+ *
+ * This means that the stack layout is as follows:
+ *
+ *	+---------------------+ (highest addr)
+ *	|   struct pt_regs    |
+ *	+---------------------+
+ *	| struct switch_stack |
+ *	+---------------------+
+ *	|                     |
+ *	|    memory stack     |
+ *	|                     | <-- sp (lowest addr)
+ *	+---------------------+
+ *
+ * Observe that we copy the unat values that are in pt_regs and switch_stack.  Spilling an
+ * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register,
+ * with N=(X & 0x1ff)/8.  Thus, copying the unat value preserves the NaT bits ONLY if the
+ * pt_regs structure in the parent is congruent to that of the child, modulo 512.  Since
+ * the stack is page aligned and the page size is at least 4KB, this is always the case,
+ * so there is nothing to worry about.
+ */
+int
+copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
+{
+	unsigned long clone_flags = args->flags;
+	unsigned long user_stack_base = args->stack;
+	unsigned long user_stack_size = args->stack_size;
+	unsigned long tls = args->tls;
+	extern char ia64_ret_from_clone;
+	struct switch_stack *child_stack, *stack;
+	unsigned long rbs, child_rbs, rbs_size;
+	struct pt_regs *child_ptregs;
+	struct pt_regs *regs = current_pt_regs();
+	int retval = 0;
+
+	child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
+	child_stack = (struct switch_stack *) child_ptregs - 1;
+
+	rbs = (unsigned long) current + IA64_RBS_OFFSET;
+	child_rbs = (unsigned long) p + IA64_RBS_OFFSET;
+
+	/* copy parts of thread_struct: */
+	p->thread.ksp = (unsigned long) child_stack - 16;
+
+	/*
+	 * NOTE: The calling convention considers all floating point
+	 * registers in the high partition (fph) to be scratch.  Since
+	 * the only way to get to this point is through a system call,
+	 * we know that the values in fph are all dead.  Hence, there
+	 * is no need to inherit the fph state from the parent to the
+	 * child and all we have to do is to make sure that
+	 * IA64_THREAD_FPH_VALID is cleared in the child.
+	 *
+	 * XXX We could push this optimization a bit further by
+	 * clearing IA64_THREAD_FPH_VALID on ANY system call.
+	 * However, it's not clear this is worth doing.  Also, it
+	 * would be a slight deviation from the normal Linux system
+	 * call behavior where scratch registers are preserved across
+	 * system calls (unless used by the system call itself).
+	 */
+#	define THREAD_FLAGS_TO_CLEAR	(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \
+					 | IA64_THREAD_PM_VALID)
+#	define THREAD_FLAGS_TO_SET	0
+	p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR)
+			   | THREAD_FLAGS_TO_SET);
+
+	ia64_drop_fpu(p);	/* don't pick up stale state from a CPU's fph */
+
+	if (unlikely(args->fn)) {
+		if (unlikely(args->idle)) {
+			/* fork_idle() called us */
+			return 0;
+		}
+		memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack));
+		child_stack->r4 = (unsigned long) args->fn;
+		child_stack->r5 = (unsigned long) args->fn_arg;
+		/*
+		 * Preserve PSR bits, except for bits 32-34 and 37-45,
+		 * which we can't read.
+		 */
+		child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
+		/* mark as valid, empty frame */
+		child_ptregs->cr_ifs = 1UL << 63;
+		child_stack->ar_fpsr = child_ptregs->ar_fpsr
+			= ia64_getreg(_IA64_REG_AR_FPSR);
+		child_stack->pr = (1 << PRED_KERNEL_STACK);
+		child_stack->ar_bspstore = child_rbs;
+		child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
+
+		/* stop some PSR bits from being inherited.
+		 * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
+		 * therefore we must specify them explicitly here and not include them in
+		 * IA64_PSR_BITS_TO_CLEAR.
+		 */
+		child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
+				 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
+
+		return 0;
+	}
+	stack = ((struct switch_stack *) regs) - 1;
+	/* copy parent's switch_stack & pt_regs to child: */
+	memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
+
+	/* copy the parent's register backing store to the child: */
+	rbs_size = stack->ar_bspstore - rbs;
+	memcpy((void *) child_rbs, (void *) rbs, rbs_size);
+	if (clone_flags & CLONE_SETTLS)
+		child_ptregs->r13 = tls;
+	if (user_stack_base) {
+		child_ptregs->r12 = user_stack_base + user_stack_size - 16;
+		child_ptregs->ar_bspstore = user_stack_base;
+		child_ptregs->ar_rnat = 0;
+		child_ptregs->loadrs = 0;
+	}
+	child_stack->ar_bspstore = child_rbs + rbs_size;
+	child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
+
+	/* stop some PSR bits from being inherited.
+	 * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
+	 * therefore we must specify them explicitly here and not include them in
+	 * IA64_PSR_BITS_TO_CLEAR.
+	 */
+	child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
+				 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
+	return retval;
+}
+
+asmlinkage long ia64_clone(unsigned long clone_flags, unsigned long stack_start,
+			   unsigned long stack_size, unsigned long parent_tidptr,
+			   unsigned long child_tidptr, unsigned long tls)
+{
+	struct kernel_clone_args args = {
+		.flags		= (lower_32_bits(clone_flags) & ~CSIGNAL),
+		.pidfd		= (int __user *)parent_tidptr,
+		.child_tid	= (int __user *)child_tidptr,
+		.parent_tid	= (int __user *)parent_tidptr,
+		.exit_signal	= (lower_32_bits(clone_flags) & CSIGNAL),
+		.stack		= stack_start,
+		.stack_size	= stack_size,
+		.tls		= tls,
+	};
+
+	return kernel_clone(&args);
+}
+
+static void
+do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg)
+{
+	unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm;
+	unsigned long ip;
+	elf_greg_t *dst = arg;
+	struct pt_regs *pt;
+	char nat;
+	int i;
+
+	memset(dst, 0, sizeof(elf_gregset_t));	/* don't leak any kernel bits to user-level */
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	unw_get_sp(info, &sp);
+	pt = (struct pt_regs *) (sp + 16);
+
+	urbs_end = ia64_get_user_rbs_end(task, pt, &cfm);
+
+	if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0)
+		return;
+
+	ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end),
+		  &ar_rnat);
+
+	/*
+	 * coredump format:
+	 *	r0-r31
+	 *	NaT bits (for r0-r31; bit N == 1 iff rN is a NaT)
+	 *	predicate registers (p0-p63)
+	 *	b0-b7
+	 *	ip cfm user-mask
+	 *	ar.rsc ar.bsp ar.bspstore ar.rnat
+	 *	ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec
+	 */
+
+	/* r0 is zero */
+	for (i = 1, mask = (1UL << i); i < 32; ++i) {
+		unw_get_gr(info, i, &dst[i], &nat);
+		if (nat)
+			nat_bits |= mask;
+		mask <<= 1;
+	}
+	dst[32] = nat_bits;
+	unw_get_pr(info, &dst[33]);
+
+	for (i = 0; i < 8; ++i)
+		unw_get_br(info, i, &dst[34 + i]);
+
+	unw_get_rp(info, &ip);
+	dst[42] = ip + ia64_psr(pt)->ri;
+	dst[43] = cfm;
+	dst[44] = pt->cr_ipsr & IA64_PSR_UM;
+
+	unw_get_ar(info, UNW_AR_RSC, &dst[45]);
+	/*
+	 * For bsp and bspstore, unw_get_ar() would return the kernel
+	 * addresses, but we need the user-level addresses instead:
+	 */
+	dst[46] = urbs_end;	/* note: by convention PT_AR_BSP points to the end of the urbs! */
+	dst[47] = pt->ar_bspstore;
+	dst[48] = ar_rnat;
+	unw_get_ar(info, UNW_AR_CCV, &dst[49]);
+	unw_get_ar(info, UNW_AR_UNAT, &dst[50]);
+	unw_get_ar(info, UNW_AR_FPSR, &dst[51]);
+	dst[52] = pt->ar_pfs;	/* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */
+	unw_get_ar(info, UNW_AR_LC, &dst[53]);
+	unw_get_ar(info, UNW_AR_EC, &dst[54]);
+	unw_get_ar(info, UNW_AR_CSD, &dst[55]);
+	unw_get_ar(info, UNW_AR_SSD, &dst[56]);
+}
+
+static void
+do_copy_regs (struct unw_frame_info *info, void *arg)
+{
+	do_copy_task_regs(current, info, arg);
+}
+
+void
+ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
+{
+	unw_init_running(do_copy_regs, dst);
+}
+
+/*
+ * Flush thread state.  This is called when a thread does an execve().
+ */
+void
+flush_thread (void)
+{
+	/* drop floating-point and debug-register state if it exists: */
+	current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID);
+	ia64_drop_fpu(current);
+}
+
+/*
+ * Clean up state associated with a thread.  This is called when
+ * the thread calls exit().
+ */
+void
+exit_thread (struct task_struct *tsk)
+{
+
+	ia64_drop_fpu(tsk);
+}
+
+unsigned long
+__get_wchan (struct task_struct *p)
+{
+	struct unw_frame_info info;
+	unsigned long ip;
+	int count = 0;
+
+	/*
+	 * Note: p may not be a blocked task (it could be current or
+	 * another process running on some other CPU.  Rather than
+	 * trying to determine if p is really blocked, we just assume
+	 * it's blocked and rely on the unwind routines to fail
+	 * gracefully if the process wasn't really blocked after all.
+	 * --davidm 99/12/15
+	 */
+	unw_init_from_blocked_task(&info, p);
+	do {
+		if (task_is_running(p))
+			return 0;
+		if (unw_unwind(&info) < 0)
+			return 0;
+		unw_get_ip(&info, &ip);
+		if (!in_sched_functions(ip))
+			return ip;
+	} while (count++ < 16);
+	return 0;
+}
+
+void
+cpu_halt (void)
+{
+	pal_power_mgmt_info_u_t power_info[8];
+	unsigned long min_power;
+	int i, min_power_state;
+
+	if (ia64_pal_halt_info(power_info) != 0)
+		return;
+
+	min_power_state = 0;
+	min_power = power_info[0].pal_power_mgmt_info_s.power_consumption;
+	for (i = 1; i < 8; ++i)
+		if (power_info[i].pal_power_mgmt_info_s.im
+		    && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) {
+			min_power = power_info[i].pal_power_mgmt_info_s.power_consumption;
+			min_power_state = i;
+		}
+
+	while (1)
+		ia64_pal_halt(min_power_state);
+}
+
+void machine_shutdown(void)
+{
+	smp_shutdown_nonboot_cpus(reboot_cpu);
+
+#ifdef CONFIG_KEXEC
+	kexec_disable_iosapic();
+#endif
+}
+
+void
+machine_restart (char *restart_cmd)
+{
+	(void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
+	efi_reboot(REBOOT_WARM, NULL);
+}
+
+void
+machine_halt (void)
+{
+	(void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0);
+	cpu_halt();
+}
+
+void
+machine_power_off (void)
+{
+	do_kernel_power_off();
+	machine_halt();
+}
+
+EXPORT_SYMBOL(ia64_delay_loop);
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
new file mode 100644
index 000000000..ab8aeb34d
--- /dev/null
+++ b/arch/ia64/kernel/ptrace.c
@@ -0,0 +1,2014 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kernel support for the ptrace() and syscall tracing interfaces.
+ *
+ * Copyright (C) 1999-2005 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2006 Intel Co
+ *  2006-08-12	- IA64 Native Utrace implementation support added by
+ *	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
+ *
+ * Derived from the x86 and Alpha versions.
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/task.h>
+#include <linux/sched/task_stack.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/security.h>
+#include <linux/audit.h>
+#include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
+#include <linux/resume_user_mode.h>
+
+#include <asm/processor.h>
+#include <asm/ptrace_offsets.h>
+#include <asm/rse.h>
+#include <linux/uaccess.h>
+#include <asm/unwind.h>
+
+#include "entry.h"
+
+/*
+ * Bits in the PSR that we allow ptrace() to change:
+ *	be, up, ac, mfl, mfh (the user mask; five bits total)
+ *	db (debug breakpoint fault; one bit)
+ *	id (instruction debug fault disable; one bit)
+ *	dd (data debug fault disable; one bit)
+ *	ri (restart instruction; two bits)
+ *	is (instruction set; one bit)
+ */
+#define IPSR_MASK (IA64_PSR_UM | IA64_PSR_DB | IA64_PSR_IS	\
+		   | IA64_PSR_ID | IA64_PSR_DD | IA64_PSR_RI)
+
+#define MASK(nbits)	((1UL << (nbits)) - 1)	/* mask with NBITS bits set */
+#define PFM_MASK	MASK(38)
+
+#define PTRACE_DEBUG	0
+
+#if PTRACE_DEBUG
+# define dprintk(format...)	printk(format)
+# define inline
+#else
+# define dprintk(format...)
+#endif
+
+/* Return TRUE if PT was created due to kernel-entry via a system-call.  */
+
+static inline int
+in_syscall (struct pt_regs *pt)
+{
+	return (long) pt->cr_ifs >= 0;
+}
+
+/*
+ * Collect the NaT bits for r1-r31 from scratch_unat and return a NaT
+ * bitset where bit i is set iff the NaT bit of register i is set.
+ */
+unsigned long
+ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat)
+{
+#	define GET_BITS(first, last, unat)				\
+	({								\
+		unsigned long bit = ia64_unat_pos(&pt->r##first);	\
+		unsigned long nbits = (last - first + 1);		\
+		unsigned long mask = MASK(nbits) << first;		\
+		unsigned long dist;					\
+		if (bit < first)					\
+			dist = 64 + bit - first;			\
+		else							\
+			dist = bit - first;				\
+		ia64_rotr(unat, dist) & mask;				\
+	})
+	unsigned long val;
+
+	/*
+	 * Registers that are stored consecutively in struct pt_regs
+	 * can be handled in parallel.  If the register order in
+	 * struct_pt_regs changes, this code MUST be updated.
+	 */
+	val  = GET_BITS( 1,  1, scratch_unat);
+	val |= GET_BITS( 2,  3, scratch_unat);
+	val |= GET_BITS(12, 13, scratch_unat);
+	val |= GET_BITS(14, 14, scratch_unat);
+	val |= GET_BITS(15, 15, scratch_unat);
+	val |= GET_BITS( 8, 11, scratch_unat);
+	val |= GET_BITS(16, 31, scratch_unat);
+	return val;
+
+#	undef GET_BITS
+}
+
+/*
+ * Set the NaT bits for the scratch registers according to NAT and
+ * return the resulting unat (assuming the scratch registers are
+ * stored in PT).
+ */
+unsigned long
+ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat)
+{
+#	define PUT_BITS(first, last, nat)				\
+	({								\
+		unsigned long bit = ia64_unat_pos(&pt->r##first);	\
+		unsigned long nbits = (last - first + 1);		\
+		unsigned long mask = MASK(nbits) << first;		\
+		long dist;						\
+		if (bit < first)					\
+			dist = 64 + bit - first;			\
+		else							\
+			dist = bit - first;				\
+		ia64_rotl(nat & mask, dist);				\
+	})
+	unsigned long scratch_unat;
+
+	/*
+	 * Registers that are stored consecutively in struct pt_regs
+	 * can be handled in parallel.  If the register order in
+	 * struct_pt_regs changes, this code MUST be updated.
+	 */
+	scratch_unat  = PUT_BITS( 1,  1, nat);
+	scratch_unat |= PUT_BITS( 2,  3, nat);
+	scratch_unat |= PUT_BITS(12, 13, nat);
+	scratch_unat |= PUT_BITS(14, 14, nat);
+	scratch_unat |= PUT_BITS(15, 15, nat);
+	scratch_unat |= PUT_BITS( 8, 11, nat);
+	scratch_unat |= PUT_BITS(16, 31, nat);
+
+	return scratch_unat;
+
+#	undef PUT_BITS
+}
+
+#define IA64_MLX_TEMPLATE	0x2
+#define IA64_MOVL_OPCODE	6
+
+void
+ia64_increment_ip (struct pt_regs *regs)
+{
+	unsigned long w0, ri = ia64_psr(regs)->ri + 1;
+
+	if (ri > 2) {
+		ri = 0;
+		regs->cr_iip += 16;
+	} else if (ri == 2) {
+		get_user(w0, (char __user *) regs->cr_iip + 0);
+		if (((w0 >> 1) & 0xf) == IA64_MLX_TEMPLATE) {
+			/*
+			 * rfi'ing to slot 2 of an MLX bundle causes
+			 * an illegal operation fault.  We don't want
+			 * that to happen...
+			 */
+			ri = 0;
+			regs->cr_iip += 16;
+		}
+	}
+	ia64_psr(regs)->ri = ri;
+}
+
+void
+ia64_decrement_ip (struct pt_regs *regs)
+{
+	unsigned long w0, ri = ia64_psr(regs)->ri - 1;
+
+	if (ia64_psr(regs)->ri == 0) {
+		regs->cr_iip -= 16;
+		ri = 2;
+		get_user(w0, (char __user *) regs->cr_iip + 0);
+		if (((w0 >> 1) & 0xf) == IA64_MLX_TEMPLATE) {
+			/*
+			 * rfi'ing to slot 2 of an MLX bundle causes
+			 * an illegal operation fault.  We don't want
+			 * that to happen...
+			 */
+			ri = 1;
+		}
+	}
+	ia64_psr(regs)->ri = ri;
+}
+
+/*
+ * This routine is used to read an rnat bits that are stored on the
+ * kernel backing store.  Since, in general, the alignment of the user
+ * and kernel are different, this is not completely trivial.  In
+ * essence, we need to construct the user RNAT based on up to two
+ * kernel RNAT values and/or the RNAT value saved in the child's
+ * pt_regs.
+ *
+ * user rbs
+ *
+ * +--------+ <-- lowest address
+ * | slot62 |
+ * +--------+
+ * |  rnat  | 0x....1f8
+ * +--------+
+ * | slot00 | \
+ * +--------+ |
+ * | slot01 | > child_regs->ar_rnat
+ * +--------+ |
+ * | slot02 | /				kernel rbs
+ * +--------+				+--------+
+ *	    <- child_regs->ar_bspstore	| slot61 | <-- krbs
+ * +- - - - +				+--------+
+ *					| slot62 |
+ * +- - - - +				+--------+
+ *					|  rnat	 |
+ * +- - - - +				+--------+
+ *   vrnat				| slot00 |
+ * +- - - - +				+--------+
+ *					=	 =
+ *					+--------+
+ *					| slot00 | \
+ *					+--------+ |
+ *					| slot01 | > child_stack->ar_rnat
+ *					+--------+ |
+ *					| slot02 | /
+ *					+--------+
+ *						  <--- child_stack->ar_bspstore
+ *
+ * The way to think of this code is as follows: bit 0 in the user rnat
+ * corresponds to some bit N (0 <= N <= 62) in one of the kernel rnat
+ * value.  The kernel rnat value holding this bit is stored in
+ * variable rnat0.  rnat1 is loaded with the kernel rnat value that
+ * form the upper bits of the user rnat value.
+ *
+ * Boundary cases:
+ *
+ * o when reading the rnat "below" the first rnat slot on the kernel
+ *   backing store, rnat0/rnat1 are set to 0 and the low order bits are
+ *   merged in from pt->ar_rnat.
+ *
+ * o when reading the rnat "above" the last rnat slot on the kernel
+ *   backing store, rnat0/rnat1 gets its value from sw->ar_rnat.
+ */
+static unsigned long
+get_rnat (struct task_struct *task, struct switch_stack *sw,
+	  unsigned long *krbs, unsigned long *urnat_addr,
+	  unsigned long *urbs_end)
+{
+	unsigned long rnat0 = 0, rnat1 = 0, urnat = 0, *slot0_kaddr;
+	unsigned long umask = 0, mask, m;
+	unsigned long *kbsp, *ubspstore, *rnat0_kaddr, *rnat1_kaddr, shift;
+	long num_regs, nbits;
+	struct pt_regs *pt;
+
+	pt = task_pt_regs(task);
+	kbsp = (unsigned long *) sw->ar_bspstore;
+	ubspstore = (unsigned long *) pt->ar_bspstore;
+
+	if (urbs_end < urnat_addr)
+		nbits = ia64_rse_num_regs(urnat_addr - 63, urbs_end);
+	else
+		nbits = 63;
+	mask = MASK(nbits);
+	/*
+	 * First, figure out which bit number slot 0 in user-land maps
+	 * to in the kernel rnat.  Do this by figuring out how many
+	 * register slots we're beyond the user's backingstore and
+	 * then computing the equivalent address in kernel space.
+	 */
+	num_regs = ia64_rse_num_regs(ubspstore, urnat_addr + 1);
+	slot0_kaddr = ia64_rse_skip_regs(krbs, num_regs);
+	shift = ia64_rse_slot_num(slot0_kaddr);
+	rnat1_kaddr = ia64_rse_rnat_addr(slot0_kaddr);
+	rnat0_kaddr = rnat1_kaddr - 64;
+
+	if (ubspstore + 63 > urnat_addr) {
+		/* some bits need to be merged in from pt->ar_rnat */
+		umask = MASK(ia64_rse_slot_num(ubspstore)) & mask;
+		urnat = (pt->ar_rnat & umask);
+		mask &= ~umask;
+		if (!mask)
+			return urnat;
+	}
+
+	m = mask << shift;
+	if (rnat0_kaddr >= kbsp)
+		rnat0 = sw->ar_rnat;
+	else if (rnat0_kaddr > krbs)
+		rnat0 = *rnat0_kaddr;
+	urnat |= (rnat0 & m) >> shift;
+
+	m = mask >> (63 - shift);
+	if (rnat1_kaddr >= kbsp)
+		rnat1 = sw->ar_rnat;
+	else if (rnat1_kaddr > krbs)
+		rnat1 = *rnat1_kaddr;
+	urnat |= (rnat1 & m) << (63 - shift);
+	return urnat;
+}
+
+/*
+ * The reverse of get_rnat.
+ */
+static void
+put_rnat (struct task_struct *task, struct switch_stack *sw,
+	  unsigned long *krbs, unsigned long *urnat_addr, unsigned long urnat,
+	  unsigned long *urbs_end)
+{
+	unsigned long rnat0 = 0, rnat1 = 0, *slot0_kaddr, umask = 0, mask, m;
+	unsigned long *kbsp, *ubspstore, *rnat0_kaddr, *rnat1_kaddr, shift;
+	long num_regs, nbits;
+	struct pt_regs *pt;
+	unsigned long cfm, *urbs_kargs;
+
+	pt = task_pt_regs(task);
+	kbsp = (unsigned long *) sw->ar_bspstore;
+	ubspstore = (unsigned long *) pt->ar_bspstore;
+
+	urbs_kargs = urbs_end;
+	if (in_syscall(pt)) {
+		/*
+		 * If entered via syscall, don't allow user to set rnat bits
+		 * for syscall args.
+		 */
+		cfm = pt->cr_ifs;
+		urbs_kargs = ia64_rse_skip_regs(urbs_end, -(cfm & 0x7f));
+	}
+
+	if (urbs_kargs >= urnat_addr)
+		nbits = 63;
+	else {
+		if ((urnat_addr - 63) >= urbs_kargs)
+			return;
+		nbits = ia64_rse_num_regs(urnat_addr - 63, urbs_kargs);
+	}
+	mask = MASK(nbits);
+
+	/*
+	 * First, figure out which bit number slot 0 in user-land maps
+	 * to in the kernel rnat.  Do this by figuring out how many
+	 * register slots we're beyond the user's backingstore and
+	 * then computing the equivalent address in kernel space.
+	 */
+	num_regs = ia64_rse_num_regs(ubspstore, urnat_addr + 1);
+	slot0_kaddr = ia64_rse_skip_regs(krbs, num_regs);
+	shift = ia64_rse_slot_num(slot0_kaddr);
+	rnat1_kaddr = ia64_rse_rnat_addr(slot0_kaddr);
+	rnat0_kaddr = rnat1_kaddr - 64;
+
+	if (ubspstore + 63 > urnat_addr) {
+		/* some bits need to be place in pt->ar_rnat: */
+		umask = MASK(ia64_rse_slot_num(ubspstore)) & mask;
+		pt->ar_rnat = (pt->ar_rnat & ~umask) | (urnat & umask);
+		mask &= ~umask;
+		if (!mask)
+			return;
+	}
+	/*
+	 * Note: Section 11.1 of the EAS guarantees that bit 63 of an
+	 * rnat slot is ignored. so we don't have to clear it here.
+	 */
+	rnat0 = (urnat << shift);
+	m = mask << shift;
+	if (rnat0_kaddr >= kbsp)
+		sw->ar_rnat = (sw->ar_rnat & ~m) | (rnat0 & m);
+	else if (rnat0_kaddr > krbs)
+		*rnat0_kaddr = ((*rnat0_kaddr & ~m) | (rnat0 & m));
+
+	rnat1 = (urnat >> (63 - shift));
+	m = mask >> (63 - shift);
+	if (rnat1_kaddr >= kbsp)
+		sw->ar_rnat = (sw->ar_rnat & ~m) | (rnat1 & m);
+	else if (rnat1_kaddr > krbs)
+		*rnat1_kaddr = ((*rnat1_kaddr & ~m) | (rnat1 & m));
+}
+
+static inline int
+on_kernel_rbs (unsigned long addr, unsigned long bspstore,
+	       unsigned long urbs_end)
+{
+	unsigned long *rnat_addr = ia64_rse_rnat_addr((unsigned long *)
+						      urbs_end);
+	return (addr >= bspstore && addr <= (unsigned long) rnat_addr);
+}
+
+/*
+ * Read a word from the user-level backing store of task CHILD.  ADDR
+ * is the user-level address to read the word from, VAL a pointer to
+ * the return value, and USER_BSP gives the end of the user-level
+ * backing store (i.e., it's the address that would be in ar.bsp after
+ * the user executed a "cover" instruction).
+ *
+ * This routine takes care of accessing the kernel register backing
+ * store for those registers that got spilled there.  It also takes
+ * care of calculating the appropriate RNaT collection words.
+ */
+long
+ia64_peek (struct task_struct *child, struct switch_stack *child_stack,
+	   unsigned long user_rbs_end, unsigned long addr, long *val)
+{
+	unsigned long *bspstore, *krbs, regnum, *laddr, *urbs_end, *rnat_addr;
+	struct pt_regs *child_regs;
+	size_t copied;
+	long ret;
+
+	urbs_end = (long *) user_rbs_end;
+	laddr = (unsigned long *) addr;
+	child_regs = task_pt_regs(child);
+	bspstore = (unsigned long *) child_regs->ar_bspstore;
+	krbs = (unsigned long *) child + IA64_RBS_OFFSET/8;
+	if (on_kernel_rbs(addr, (unsigned long) bspstore,
+			  (unsigned long) urbs_end))
+	{
+		/*
+		 * Attempt to read the RBS in an area that's actually
+		 * on the kernel RBS => read the corresponding bits in
+		 * the kernel RBS.
+		 */
+		rnat_addr = ia64_rse_rnat_addr(laddr);
+		ret = get_rnat(child, child_stack, krbs, rnat_addr, urbs_end);
+
+		if (laddr == rnat_addr) {
+			/* return NaT collection word itself */
+			*val = ret;
+			return 0;
+		}
+
+		if (((1UL << ia64_rse_slot_num(laddr)) & ret) != 0) {
+			/*
+			 * It is implementation dependent whether the
+			 * data portion of a NaT value gets saved on a
+			 * st8.spill or RSE spill (e.g., see EAS 2.6,
+			 * 4.4.4.6 Register Spill and Fill).  To get
+			 * consistent behavior across all possible
+			 * IA-64 implementations, we return zero in
+			 * this case.
+			 */
+			*val = 0;
+			return 0;
+		}
+
+		if (laddr < urbs_end) {
+			/*
+			 * The desired word is on the kernel RBS and
+			 * is not a NaT.
+			 */
+			regnum = ia64_rse_num_regs(bspstore, laddr);
+			*val = *ia64_rse_skip_regs(krbs, regnum);
+			return 0;
+		}
+	}
+	copied = access_process_vm(child, addr, &ret, sizeof(ret), FOLL_FORCE);
+	if (copied != sizeof(ret))
+		return -EIO;
+	*val = ret;
+	return 0;
+}
+
+long
+ia64_poke (struct task_struct *child, struct switch_stack *child_stack,
+	   unsigned long user_rbs_end, unsigned long addr, long val)
+{
+	unsigned long *bspstore, *krbs, regnum, *laddr;
+	unsigned long *urbs_end = (long *) user_rbs_end;
+	struct pt_regs *child_regs;
+
+	laddr = (unsigned long *) addr;
+	child_regs = task_pt_regs(child);
+	bspstore = (unsigned long *) child_regs->ar_bspstore;
+	krbs = (unsigned long *) child + IA64_RBS_OFFSET/8;
+	if (on_kernel_rbs(addr, (unsigned long) bspstore,
+			  (unsigned long) urbs_end))
+	{
+		/*
+		 * Attempt to write the RBS in an area that's actually
+		 * on the kernel RBS => write the corresponding bits
+		 * in the kernel RBS.
+		 */
+		if (ia64_rse_is_rnat_slot(laddr))
+			put_rnat(child, child_stack, krbs, laddr, val,
+				 urbs_end);
+		else {
+			if (laddr < urbs_end) {
+				regnum = ia64_rse_num_regs(bspstore, laddr);
+				*ia64_rse_skip_regs(krbs, regnum) = val;
+			}
+		}
+	} else if (access_process_vm(child, addr, &val, sizeof(val),
+				FOLL_FORCE | FOLL_WRITE)
+		   != sizeof(val))
+		return -EIO;
+	return 0;
+}
+
+/*
+ * Calculate the address of the end of the user-level register backing
+ * store.  This is the address that would have been stored in ar.bsp
+ * if the user had executed a "cover" instruction right before
+ * entering the kernel.  If CFMP is not NULL, it is used to return the
+ * "current frame mask" that was active at the time the kernel was
+ * entered.
+ */
+unsigned long
+ia64_get_user_rbs_end (struct task_struct *child, struct pt_regs *pt,
+		       unsigned long *cfmp)
+{
+	unsigned long *krbs, *bspstore, cfm = pt->cr_ifs;
+	long ndirty;
+
+	krbs = (unsigned long *) child + IA64_RBS_OFFSET/8;
+	bspstore = (unsigned long *) pt->ar_bspstore;
+	ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19));
+
+	if (in_syscall(pt))
+		ndirty += (cfm & 0x7f);
+	else
+		cfm &= ~(1UL << 63);	/* clear valid bit */
+
+	if (cfmp)
+		*cfmp = cfm;
+	return (unsigned long) ia64_rse_skip_regs(bspstore, ndirty);
+}
+
+/*
+ * Synchronize (i.e, write) the RSE backing store living in kernel
+ * space to the VM of the CHILD task.  SW and PT are the pointers to
+ * the switch_stack and pt_regs structures, respectively.
+ * USER_RBS_END is the user-level address at which the backing store
+ * ends.
+ */
+long
+ia64_sync_user_rbs (struct task_struct *child, struct switch_stack *sw,
+		    unsigned long user_rbs_start, unsigned long user_rbs_end)
+{
+	unsigned long addr, val;
+	long ret;
+
+	/* now copy word for word from kernel rbs to user rbs: */
+	for (addr = user_rbs_start; addr < user_rbs_end; addr += 8) {
+		ret = ia64_peek(child, sw, user_rbs_end, addr, &val);
+		if (ret < 0)
+			return ret;
+		if (access_process_vm(child, addr, &val, sizeof(val),
+				FOLL_FORCE | FOLL_WRITE)
+		    != sizeof(val))
+			return -EIO;
+	}
+	return 0;
+}
+
+static long
+ia64_sync_kernel_rbs (struct task_struct *child, struct switch_stack *sw,
+		unsigned long user_rbs_start, unsigned long user_rbs_end)
+{
+	unsigned long addr, val;
+	long ret;
+
+	/* now copy word for word from user rbs to kernel rbs: */
+	for (addr = user_rbs_start; addr < user_rbs_end; addr += 8) {
+		if (access_process_vm(child, addr, &val, sizeof(val),
+				FOLL_FORCE)
+				!= sizeof(val))
+			return -EIO;
+
+		ret = ia64_poke(child, sw, user_rbs_end, addr, val);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+typedef long (*syncfunc_t)(struct task_struct *, struct switch_stack *,
+			    unsigned long, unsigned long);
+
+static void do_sync_rbs(struct unw_frame_info *info, void *arg)
+{
+	struct pt_regs *pt;
+	unsigned long urbs_end;
+	syncfunc_t fn = arg;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+	pt = task_pt_regs(info->task);
+	urbs_end = ia64_get_user_rbs_end(info->task, pt, NULL);
+
+	fn(info->task, info->sw, pt->ar_bspstore, urbs_end);
+}
+
+/*
+ * when a thread is stopped (ptraced), debugger might change thread's user
+ * stack (change memory directly), and we must avoid the RSE stored in kernel
+ * to override user stack (user space's RSE is newer than kernel's in the
+ * case). To workaround the issue, we copy kernel RSE to user RSE before the
+ * task is stopped, so user RSE has updated data.  we then copy user RSE to
+ * kernel after the task is resummed from traced stop and kernel will use the
+ * newer RSE to return to user. TIF_RESTORE_RSE is the flag to indicate we need
+ * synchronize user RSE to kernel.
+ */
+void ia64_ptrace_stop(void)
+{
+	if (test_and_set_tsk_thread_flag(current, TIF_RESTORE_RSE))
+		return;
+	set_notify_resume(current);
+	unw_init_running(do_sync_rbs, ia64_sync_user_rbs);
+}
+
+/*
+ * This is called to read back the register backing store.
+ */
+void ia64_sync_krbs(void)
+{
+	clear_tsk_thread_flag(current, TIF_RESTORE_RSE);
+
+	unw_init_running(do_sync_rbs, ia64_sync_kernel_rbs);
+}
+
+/*
+ * Write f32-f127 back to task->thread.fph if it has been modified.
+ */
+inline void
+ia64_flush_fph (struct task_struct *task)
+{
+	struct ia64_psr *psr = ia64_psr(task_pt_regs(task));
+
+	/*
+	 * Prevent migrating this task while
+	 * we're fiddling with the FPU state
+	 */
+	preempt_disable();
+	if (ia64_is_local_fpu_owner(task) && psr->mfh) {
+		psr->mfh = 0;
+		task->thread.flags |= IA64_THREAD_FPH_VALID;
+		ia64_save_fpu(&task->thread.fph[0]);
+	}
+	preempt_enable();
+}
+
+/*
+ * Sync the fph state of the task so that it can be manipulated
+ * through thread.fph.  If necessary, f32-f127 are written back to
+ * thread.fph or, if the fph state hasn't been used before, thread.fph
+ * is cleared to zeroes.  Also, access to f32-f127 is disabled to
+ * ensure that the task picks up the state from thread.fph when it
+ * executes again.
+ */
+void
+ia64_sync_fph (struct task_struct *task)
+{
+	struct ia64_psr *psr = ia64_psr(task_pt_regs(task));
+
+	ia64_flush_fph(task);
+	if (!(task->thread.flags & IA64_THREAD_FPH_VALID)) {
+		task->thread.flags |= IA64_THREAD_FPH_VALID;
+		memset(&task->thread.fph, 0, sizeof(task->thread.fph));
+	}
+	ia64_drop_fpu(task);
+	psr->dfh = 1;
+}
+
+/*
+ * Change the machine-state of CHILD such that it will return via the normal
+ * kernel exit-path, rather than the syscall-exit path.
+ */
+static void
+convert_to_non_syscall (struct task_struct *child, struct pt_regs  *pt,
+			unsigned long cfm)
+{
+	struct unw_frame_info info, prev_info;
+	unsigned long ip, sp, pr;
+
+	unw_init_from_blocked_task(&info, child);
+	while (1) {
+		prev_info = info;
+		if (unw_unwind(&info) < 0)
+			return;
+
+		unw_get_sp(&info, &sp);
+		if ((long)((unsigned long)child + IA64_STK_OFFSET - sp)
+		    < IA64_PT_REGS_SIZE) {
+			dprintk("ptrace.%s: ran off the top of the kernel "
+				"stack\n", __func__);
+			return;
+		}
+		if (unw_get_pr (&prev_info, &pr) < 0) {
+			unw_get_rp(&prev_info, &ip);
+			dprintk("ptrace.%s: failed to read "
+				"predicate register (ip=0x%lx)\n",
+				__func__, ip);
+			return;
+		}
+		if (unw_is_intr_frame(&info)
+		    && (pr & (1UL << PRED_USER_STACK)))
+			break;
+	}
+
+	/*
+	 * Note: at the time of this call, the target task is blocked
+	 * in notify_resume_user() and by clearling PRED_LEAVE_SYSCALL
+	 * (aka, "pLvSys") we redirect execution from
+	 * .work_pending_syscall_end to .work_processed_kernel.
+	 */
+	unw_get_pr(&prev_info, &pr);
+	pr &= ~((1UL << PRED_SYSCALL) | (1UL << PRED_LEAVE_SYSCALL));
+	pr |=  (1UL << PRED_NON_SYSCALL);
+	unw_set_pr(&prev_info, pr);
+
+	pt->cr_ifs = (1UL << 63) | cfm;
+	/*
+	 * Clear the memory that is NOT written on syscall-entry to
+	 * ensure we do not leak kernel-state to user when execution
+	 * resumes.
+	 */
+	pt->r2 = 0;
+	pt->r3 = 0;
+	pt->r14 = 0;
+	memset(&pt->r16, 0, 16*8);	/* clear r16-r31 */
+	memset(&pt->f6, 0, 6*16);	/* clear f6-f11 */
+	pt->b7 = 0;
+	pt->ar_ccv = 0;
+	pt->ar_csd = 0;
+	pt->ar_ssd = 0;
+}
+
+static int
+access_nat_bits (struct task_struct *child, struct pt_regs *pt,
+		 struct unw_frame_info *info,
+		 unsigned long *data, int write_access)
+{
+	unsigned long regnum, nat_bits, scratch_unat, dummy = 0;
+	char nat = 0;
+
+	if (write_access) {
+		nat_bits = *data;
+		scratch_unat = ia64_put_scratch_nat_bits(pt, nat_bits);
+		if (unw_set_ar(info, UNW_AR_UNAT, scratch_unat) < 0) {
+			dprintk("ptrace: failed to set ar.unat\n");
+			return -1;
+		}
+		for (regnum = 4; regnum <= 7; ++regnum) {
+			unw_get_gr(info, regnum, &dummy, &nat);
+			unw_set_gr(info, regnum, dummy,
+				   (nat_bits >> regnum) & 1);
+		}
+	} else {
+		if (unw_get_ar(info, UNW_AR_UNAT, &scratch_unat) < 0) {
+			dprintk("ptrace: failed to read ar.unat\n");
+			return -1;
+		}
+		nat_bits = ia64_get_scratch_nat_bits(pt, scratch_unat);
+		for (regnum = 4; regnum <= 7; ++regnum) {
+			unw_get_gr(info, regnum, &dummy, &nat);
+			nat_bits |= (nat != 0) << regnum;
+		}
+		*data = nat_bits;
+	}
+	return 0;
+}
+
+static int
+access_elf_reg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access);
+
+static long
+ptrace_getregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
+{
+	unsigned long psr, ec, lc, rnat, bsp, cfm, nat_bits, val;
+	struct unw_frame_info info;
+	struct ia64_fpreg fpval;
+	struct switch_stack *sw;
+	struct pt_regs *pt;
+	long ret, retval = 0;
+	char nat = 0;
+	int i;
+
+	if (!access_ok(ppr, sizeof(struct pt_all_user_regs)))
+		return -EIO;
+
+	pt = task_pt_regs(child);
+	sw = (struct switch_stack *) (child->thread.ksp + 16);
+	unw_init_from_blocked_task(&info, child);
+	if (unw_unwind_to_user(&info) < 0) {
+		return -EIO;
+	}
+
+	if (((unsigned long) ppr & 0x7) != 0) {
+		dprintk("ptrace:unaligned register address %p\n", ppr);
+		return -EIO;
+	}
+
+	if (access_elf_reg(child, &info, ELF_CR_IPSR_OFFSET, &psr, 0) < 0 ||
+	    access_elf_reg(child, &info, ELF_AR_EC_OFFSET, &ec, 0) < 0 ||
+	    access_elf_reg(child, &info, ELF_AR_LC_OFFSET, &lc, 0) < 0 ||
+	    access_elf_reg(child, &info, ELF_AR_RNAT_OFFSET, &rnat, 0) < 0 ||
+	    access_elf_reg(child, &info, ELF_AR_BSP_OFFSET, &bsp, 0) < 0 ||
+	    access_elf_reg(child, &info, ELF_CFM_OFFSET, &cfm, 0) < 0 ||
+	    access_elf_reg(child, &info, ELF_NAT_OFFSET, &nat_bits, 0) < 0)
+		return -EIO;
+
+	/* control regs */
+
+	retval |= __put_user(pt->cr_iip, &ppr->cr_iip);
+	retval |= __put_user(psr, &ppr->cr_ipsr);
+
+	/* app regs */
+
+	retval |= __put_user(pt->ar_pfs, &ppr->ar[PT_AUR_PFS]);
+	retval |= __put_user(pt->ar_rsc, &ppr->ar[PT_AUR_RSC]);
+	retval |= __put_user(pt->ar_bspstore, &ppr->ar[PT_AUR_BSPSTORE]);
+	retval |= __put_user(pt->ar_unat, &ppr->ar[PT_AUR_UNAT]);
+	retval |= __put_user(pt->ar_ccv, &ppr->ar[PT_AUR_CCV]);
+	retval |= __put_user(pt->ar_fpsr, &ppr->ar[PT_AUR_FPSR]);
+
+	retval |= __put_user(ec, &ppr->ar[PT_AUR_EC]);
+	retval |= __put_user(lc, &ppr->ar[PT_AUR_LC]);
+	retval |= __put_user(rnat, &ppr->ar[PT_AUR_RNAT]);
+	retval |= __put_user(bsp, &ppr->ar[PT_AUR_BSP]);
+	retval |= __put_user(cfm, &ppr->cfm);
+
+	/* gr1-gr3 */
+
+	retval |= __copy_to_user(&ppr->gr[1], &pt->r1, sizeof(long));
+	retval |= __copy_to_user(&ppr->gr[2], &pt->r2, sizeof(long) *2);
+
+	/* gr4-gr7 */
+
+	for (i = 4; i < 8; i++) {
+		if (unw_access_gr(&info, i, &val, &nat, 0) < 0)
+			return -EIO;
+		retval |= __put_user(val, &ppr->gr[i]);
+	}
+
+	/* gr8-gr11 */
+
+	retval |= __copy_to_user(&ppr->gr[8], &pt->r8, sizeof(long) * 4);
+
+	/* gr12-gr15 */
+
+	retval |= __copy_to_user(&ppr->gr[12], &pt->r12, sizeof(long) * 2);
+	retval |= __copy_to_user(&ppr->gr[14], &pt->r14, sizeof(long));
+	retval |= __copy_to_user(&ppr->gr[15], &pt->r15, sizeof(long));
+
+	/* gr16-gr31 */
+
+	retval |= __copy_to_user(&ppr->gr[16], &pt->r16, sizeof(long) * 16);
+
+	/* b0 */
+
+	retval |= __put_user(pt->b0, &ppr->br[0]);
+
+	/* b1-b5 */
+
+	for (i = 1; i < 6; i++) {
+		if (unw_access_br(&info, i, &val, 0) < 0)
+			return -EIO;
+		__put_user(val, &ppr->br[i]);
+	}
+
+	/* b6-b7 */
+
+	retval |= __put_user(pt->b6, &ppr->br[6]);
+	retval |= __put_user(pt->b7, &ppr->br[7]);
+
+	/* fr2-fr5 */
+
+	for (i = 2; i < 6; i++) {
+		if (unw_get_fr(&info, i, &fpval) < 0)
+			return -EIO;
+		retval |= __copy_to_user(&ppr->fr[i], &fpval, sizeof (fpval));
+	}
+
+	/* fr6-fr11 */
+
+	retval |= __copy_to_user(&ppr->fr[6], &pt->f6,
+				 sizeof(struct ia64_fpreg) * 6);
+
+	/* fp scratch regs(12-15) */
+
+	retval |= __copy_to_user(&ppr->fr[12], &sw->f12,
+				 sizeof(struct ia64_fpreg) * 4);
+
+	/* fr16-fr31 */
+
+	for (i = 16; i < 32; i++) {
+		if (unw_get_fr(&info, i, &fpval) < 0)
+			return -EIO;
+		retval |= __copy_to_user(&ppr->fr[i], &fpval, sizeof (fpval));
+	}
+
+	/* fph */
+
+	ia64_flush_fph(child);
+	retval |= __copy_to_user(&ppr->fr[32], &child->thread.fph,
+				 sizeof(ppr->fr[32]) * 96);
+
+	/*  preds */
+
+	retval |= __put_user(pt->pr, &ppr->pr);
+
+	/* nat bits */
+
+	retval |= __put_user(nat_bits, &ppr->nat);
+
+	ret = retval ? -EIO : 0;
+	return ret;
+}
+
+static long
+ptrace_setregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
+{
+	unsigned long psr, rsc, ec, lc, rnat, bsp, cfm, nat_bits, val = 0;
+	struct unw_frame_info info;
+	struct switch_stack *sw;
+	struct ia64_fpreg fpval;
+	struct pt_regs *pt;
+	long retval = 0;
+	int i;
+
+	memset(&fpval, 0, sizeof(fpval));
+
+	if (!access_ok(ppr, sizeof(struct pt_all_user_regs)))
+		return -EIO;
+
+	pt = task_pt_regs(child);
+	sw = (struct switch_stack *) (child->thread.ksp + 16);
+	unw_init_from_blocked_task(&info, child);
+	if (unw_unwind_to_user(&info) < 0) {
+		return -EIO;
+	}
+
+	if (((unsigned long) ppr & 0x7) != 0) {
+		dprintk("ptrace:unaligned register address %p\n", ppr);
+		return -EIO;
+	}
+
+	/* control regs */
+
+	retval |= __get_user(pt->cr_iip, &ppr->cr_iip);
+	retval |= __get_user(psr, &ppr->cr_ipsr);
+
+	/* app regs */
+
+	retval |= __get_user(pt->ar_pfs, &ppr->ar[PT_AUR_PFS]);
+	retval |= __get_user(rsc, &ppr->ar[PT_AUR_RSC]);
+	retval |= __get_user(pt->ar_bspstore, &ppr->ar[PT_AUR_BSPSTORE]);
+	retval |= __get_user(pt->ar_unat, &ppr->ar[PT_AUR_UNAT]);
+	retval |= __get_user(pt->ar_ccv, &ppr->ar[PT_AUR_CCV]);
+	retval |= __get_user(pt->ar_fpsr, &ppr->ar[PT_AUR_FPSR]);
+
+	retval |= __get_user(ec, &ppr->ar[PT_AUR_EC]);
+	retval |= __get_user(lc, &ppr->ar[PT_AUR_LC]);
+	retval |= __get_user(rnat, &ppr->ar[PT_AUR_RNAT]);
+	retval |= __get_user(bsp, &ppr->ar[PT_AUR_BSP]);
+	retval |= __get_user(cfm, &ppr->cfm);
+
+	/* gr1-gr3 */
+
+	retval |= __copy_from_user(&pt->r1, &ppr->gr[1], sizeof(long));
+	retval |= __copy_from_user(&pt->r2, &ppr->gr[2], sizeof(long) * 2);
+
+	/* gr4-gr7 */
+
+	for (i = 4; i < 8; i++) {
+		retval |= __get_user(val, &ppr->gr[i]);
+		/* NaT bit will be set via PT_NAT_BITS: */
+		if (unw_set_gr(&info, i, val, 0) < 0)
+			return -EIO;
+	}
+
+	/* gr8-gr11 */
+
+	retval |= __copy_from_user(&pt->r8, &ppr->gr[8], sizeof(long) * 4);
+
+	/* gr12-gr15 */
+
+	retval |= __copy_from_user(&pt->r12, &ppr->gr[12], sizeof(long) * 2);
+	retval |= __copy_from_user(&pt->r14, &ppr->gr[14], sizeof(long));
+	retval |= __copy_from_user(&pt->r15, &ppr->gr[15], sizeof(long));
+
+	/* gr16-gr31 */
+
+	retval |= __copy_from_user(&pt->r16, &ppr->gr[16], sizeof(long) * 16);
+
+	/* b0 */
+
+	retval |= __get_user(pt->b0, &ppr->br[0]);
+
+	/* b1-b5 */
+
+	for (i = 1; i < 6; i++) {
+		retval |= __get_user(val, &ppr->br[i]);
+		unw_set_br(&info, i, val);
+	}
+
+	/* b6-b7 */
+
+	retval |= __get_user(pt->b6, &ppr->br[6]);
+	retval |= __get_user(pt->b7, &ppr->br[7]);
+
+	/* fr2-fr5 */
+
+	for (i = 2; i < 6; i++) {
+		retval |= __copy_from_user(&fpval, &ppr->fr[i], sizeof(fpval));
+		if (unw_set_fr(&info, i, fpval) < 0)
+			return -EIO;
+	}
+
+	/* fr6-fr11 */
+
+	retval |= __copy_from_user(&pt->f6, &ppr->fr[6],
+				   sizeof(ppr->fr[6]) * 6);
+
+	/* fp scratch regs(12-15) */
+
+	retval |= __copy_from_user(&sw->f12, &ppr->fr[12],
+				   sizeof(ppr->fr[12]) * 4);
+
+	/* fr16-fr31 */
+
+	for (i = 16; i < 32; i++) {
+		retval |= __copy_from_user(&fpval, &ppr->fr[i],
+					   sizeof(fpval));
+		if (unw_set_fr(&info, i, fpval) < 0)
+			return -EIO;
+	}
+
+	/* fph */
+
+	ia64_sync_fph(child);
+	retval |= __copy_from_user(&child->thread.fph, &ppr->fr[32],
+				   sizeof(ppr->fr[32]) * 96);
+
+	/* preds */
+
+	retval |= __get_user(pt->pr, &ppr->pr);
+
+	/* nat bits */
+
+	retval |= __get_user(nat_bits, &ppr->nat);
+
+	retval |= access_elf_reg(child, &info, ELF_CR_IPSR_OFFSET, &psr, 1);
+	retval |= access_elf_reg(child, &info, ELF_AR_RSC_OFFSET, &rsc, 1);
+	retval |= access_elf_reg(child, &info, ELF_AR_EC_OFFSET, &ec, 1);
+	retval |= access_elf_reg(child, &info, ELF_AR_LC_OFFSET, &lc, 1);
+	retval |= access_elf_reg(child, &info, ELF_AR_RNAT_OFFSET, &rnat, 1);
+	retval |= access_elf_reg(child, &info, ELF_AR_BSP_OFFSET, &bsp, 1);
+	retval |= access_elf_reg(child, &info, ELF_CFM_OFFSET, &cfm, 1);
+	retval |= access_elf_reg(child, &info, ELF_NAT_OFFSET, &nat_bits, 1);
+
+	return retval ? -EIO : 0;
+}
+
+void
+user_enable_single_step (struct task_struct *child)
+{
+	struct ia64_psr *child_psr = ia64_psr(task_pt_regs(child));
+
+	set_tsk_thread_flag(child, TIF_SINGLESTEP);
+	child_psr->ss = 1;
+}
+
+void
+user_enable_block_step (struct task_struct *child)
+{
+	struct ia64_psr *child_psr = ia64_psr(task_pt_regs(child));
+
+	set_tsk_thread_flag(child, TIF_SINGLESTEP);
+	child_psr->tb = 1;
+}
+
+void
+user_disable_single_step (struct task_struct *child)
+{
+	struct ia64_psr *child_psr = ia64_psr(task_pt_regs(child));
+
+	/* make sure the single step/taken-branch trap bits are not set: */
+	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
+	child_psr->ss = 0;
+	child_psr->tb = 0;
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure the single step bit is not set.
+ */
+void
+ptrace_disable (struct task_struct *child)
+{
+	user_disable_single_step(child);
+}
+
+static int
+access_uarea (struct task_struct *child, unsigned long addr,
+	      unsigned long *data, int write_access);
+
+long
+arch_ptrace (struct task_struct *child, long request,
+	     unsigned long addr, unsigned long data)
+{
+	switch (request) {
+	case PTRACE_PEEKTEXT:
+	case PTRACE_PEEKDATA:
+		/* read word at location addr */
+		if (ptrace_access_vm(child, addr, &data, sizeof(data),
+				FOLL_FORCE)
+		    != sizeof(data))
+			return -EIO;
+		/* ensure return value is not mistaken for error code */
+		force_successful_syscall_return();
+		return data;
+
+	/* PTRACE_POKETEXT and PTRACE_POKEDATA is handled
+	 * by the generic ptrace_request().
+	 */
+
+	case PTRACE_PEEKUSR:
+		/* read the word at addr in the USER area */
+		if (access_uarea(child, addr, &data, 0) < 0)
+			return -EIO;
+		/* ensure return value is not mistaken for error code */
+		force_successful_syscall_return();
+		return data;
+
+	case PTRACE_POKEUSR:
+		/* write the word at addr in the USER area */
+		if (access_uarea(child, addr, &data, 1) < 0)
+			return -EIO;
+		return 0;
+
+	case PTRACE_OLD_GETSIGINFO:
+		/* for backwards-compatibility */
+		return ptrace_request(child, PTRACE_GETSIGINFO, addr, data);
+
+	case PTRACE_OLD_SETSIGINFO:
+		/* for backwards-compatibility */
+		return ptrace_request(child, PTRACE_SETSIGINFO, addr, data);
+
+	case PTRACE_GETREGS:
+		return ptrace_getregs(child,
+				      (struct pt_all_user_regs __user *) data);
+
+	case PTRACE_SETREGS:
+		return ptrace_setregs(child,
+				      (struct pt_all_user_regs __user *) data);
+
+	default:
+		return ptrace_request(child, request, addr, data);
+	}
+}
+
+
+/* "asmlinkage" so the input arguments are preserved... */
+
+asmlinkage long
+syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
+		     long arg4, long arg5, long arg6, long arg7,
+		     struct pt_regs regs)
+{
+	if (test_thread_flag(TIF_SYSCALL_TRACE))
+		if (ptrace_report_syscall_entry(&regs))
+			return -ENOSYS;
+
+	/* copy user rbs to kernel rbs */
+	if (test_thread_flag(TIF_RESTORE_RSE))
+		ia64_sync_krbs();
+
+
+	audit_syscall_entry(regs.r15, arg0, arg1, arg2, arg3);
+
+	return 0;
+}
+
+/* "asmlinkage" so the input arguments are preserved... */
+
+asmlinkage void
+syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
+		     long arg4, long arg5, long arg6, long arg7,
+		     struct pt_regs regs)
+{
+	int step;
+
+	audit_syscall_exit(&regs);
+
+	step = test_thread_flag(TIF_SINGLESTEP);
+	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+		ptrace_report_syscall_exit(&regs, step);
+
+	/* copy user rbs to kernel rbs */
+	if (test_thread_flag(TIF_RESTORE_RSE))
+		ia64_sync_krbs();
+}
+
+/* Utrace implementation starts here */
+struct regset_get {
+	void *kbuf;
+	void __user *ubuf;
+};
+
+struct regset_set {
+	const void *kbuf;
+	const void __user *ubuf;
+};
+
+struct regset_getset {
+	struct task_struct *target;
+	const struct user_regset *regset;
+	union {
+		struct regset_get get;
+		struct regset_set set;
+	} u;
+	unsigned int pos;
+	unsigned int count;
+	int ret;
+};
+
+static const ptrdiff_t pt_offsets[32] =
+{
+#define R(n) offsetof(struct pt_regs, r##n)
+	[0] = -1, R(1), R(2), R(3),
+	[4] = -1, [5] = -1, [6] = -1, [7] = -1,
+	R(8), R(9), R(10), R(11), R(12), R(13), R(14), R(15),
+	R(16), R(17), R(18), R(19), R(20), R(21), R(22), R(23),
+	R(24), R(25), R(26), R(27), R(28), R(29), R(30), R(31),
+#undef R
+};
+
+static int
+access_elf_gpreg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	struct pt_regs *pt = task_pt_regs(target);
+	unsigned reg = addr / sizeof(unsigned long);
+	ptrdiff_t d = pt_offsets[reg];
+
+	if (d >= 0) {
+		unsigned long *ptr = (void *)pt + d;
+		if (write_access)
+			*ptr = *data;
+		else
+			*data = *ptr;
+		return 0;
+	} else {
+		char nat = 0;
+		if (write_access) {
+			/* read NaT bit first: */
+			unsigned long dummy;
+			int ret = unw_get_gr(info, reg, &dummy, &nat);
+			if (ret < 0)
+				return ret;
+		}
+		return unw_access_gr(info, reg, data, &nat, write_access);
+	}
+}
+
+static int
+access_elf_breg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	struct pt_regs *pt;
+	unsigned long *ptr = NULL;
+
+	pt = task_pt_regs(target);
+	switch (addr) {
+	case ELF_BR_OFFSET(0):
+		ptr = &pt->b0;
+		break;
+	case ELF_BR_OFFSET(1) ... ELF_BR_OFFSET(5):
+		return unw_access_br(info, (addr - ELF_BR_OFFSET(0))/8,
+				     data, write_access);
+	case ELF_BR_OFFSET(6):
+		ptr = &pt->b6;
+		break;
+	case ELF_BR_OFFSET(7):
+		ptr = &pt->b7;
+	}
+	if (write_access)
+		*ptr = *data;
+	else
+		*data = *ptr;
+	return 0;
+}
+
+static int
+access_elf_areg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	struct pt_regs *pt;
+	unsigned long cfm, urbs_end;
+	unsigned long *ptr = NULL;
+
+	pt = task_pt_regs(target);
+	if (addr >= ELF_AR_RSC_OFFSET && addr <= ELF_AR_SSD_OFFSET) {
+		switch (addr) {
+		case ELF_AR_RSC_OFFSET:
+			/* force PL3 */
+			if (write_access)
+				pt->ar_rsc = *data | (3 << 2);
+			else
+				*data = pt->ar_rsc;
+			return 0;
+		case ELF_AR_BSP_OFFSET:
+			/*
+			 * By convention, we use PT_AR_BSP to refer to
+			 * the end of the user-level backing store.
+			 * Use ia64_rse_skip_regs(PT_AR_BSP, -CFM.sof)
+			 * to get the real value of ar.bsp at the time
+			 * the kernel was entered.
+			 *
+			 * Furthermore, when changing the contents of
+			 * PT_AR_BSP (or PT_CFM) while the task is
+			 * blocked in a system call, convert the state
+			 * so that the non-system-call exit
+			 * path is used.  This ensures that the proper
+			 * state will be picked up when resuming
+			 * execution.  However, it *also* means that
+			 * once we write PT_AR_BSP/PT_CFM, it won't be
+			 * possible to modify the syscall arguments of
+			 * the pending system call any longer.  This
+			 * shouldn't be an issue because modifying
+			 * PT_AR_BSP/PT_CFM generally implies that
+			 * we're either abandoning the pending system
+			 * call or that we defer it's re-execution
+			 * (e.g., due to GDB doing an inferior
+			 * function call).
+			 */
+			urbs_end = ia64_get_user_rbs_end(target, pt, &cfm);
+			if (write_access) {
+				if (*data != urbs_end) {
+					if (in_syscall(pt))
+						convert_to_non_syscall(target,
+								       pt,
+								       cfm);
+					/*
+					 * Simulate user-level write
+					 * of ar.bsp:
+					 */
+					pt->loadrs = 0;
+					pt->ar_bspstore = *data;
+				}
+			} else
+				*data = urbs_end;
+			return 0;
+		case ELF_AR_BSPSTORE_OFFSET:
+			ptr = &pt->ar_bspstore;
+			break;
+		case ELF_AR_RNAT_OFFSET:
+			ptr = &pt->ar_rnat;
+			break;
+		case ELF_AR_CCV_OFFSET:
+			ptr = &pt->ar_ccv;
+			break;
+		case ELF_AR_UNAT_OFFSET:
+			ptr = &pt->ar_unat;
+			break;
+		case ELF_AR_FPSR_OFFSET:
+			ptr = &pt->ar_fpsr;
+			break;
+		case ELF_AR_PFS_OFFSET:
+			ptr = &pt->ar_pfs;
+			break;
+		case ELF_AR_LC_OFFSET:
+			return unw_access_ar(info, UNW_AR_LC, data,
+					     write_access);
+		case ELF_AR_EC_OFFSET:
+			return unw_access_ar(info, UNW_AR_EC, data,
+					     write_access);
+		case ELF_AR_CSD_OFFSET:
+			ptr = &pt->ar_csd;
+			break;
+		case ELF_AR_SSD_OFFSET:
+			ptr = &pt->ar_ssd;
+		}
+	} else if (addr >= ELF_CR_IIP_OFFSET && addr <= ELF_CR_IPSR_OFFSET) {
+		switch (addr) {
+		case ELF_CR_IIP_OFFSET:
+			ptr = &pt->cr_iip;
+			break;
+		case ELF_CFM_OFFSET:
+			urbs_end = ia64_get_user_rbs_end(target, pt, &cfm);
+			if (write_access) {
+				if (((cfm ^ *data) & PFM_MASK) != 0) {
+					if (in_syscall(pt))
+						convert_to_non_syscall(target,
+								       pt,
+								       cfm);
+					pt->cr_ifs = ((pt->cr_ifs & ~PFM_MASK)
+						      | (*data & PFM_MASK));
+				}
+			} else
+				*data = cfm;
+			return 0;
+		case ELF_CR_IPSR_OFFSET:
+			if (write_access) {
+				unsigned long tmp = *data;
+				/* psr.ri==3 is a reserved value: SDM 2:25 */
+				if ((tmp & IA64_PSR_RI) == IA64_PSR_RI)
+					tmp &= ~IA64_PSR_RI;
+				pt->cr_ipsr = ((tmp & IPSR_MASK)
+					       | (pt->cr_ipsr & ~IPSR_MASK));
+			} else
+				*data = (pt->cr_ipsr & IPSR_MASK);
+			return 0;
+		}
+	} else if (addr == ELF_NAT_OFFSET)
+		return access_nat_bits(target, pt, info,
+				       data, write_access);
+	else if (addr == ELF_PR_OFFSET)
+		ptr = &pt->pr;
+	else
+		return -1;
+
+	if (write_access)
+		*ptr = *data;
+	else
+		*data = *ptr;
+
+	return 0;
+}
+
+static int
+access_elf_reg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	if (addr >= ELF_GR_OFFSET(1) && addr <= ELF_GR_OFFSET(31))
+		return access_elf_gpreg(target, info, addr, data, write_access);
+	else if (addr >= ELF_BR_OFFSET(0) && addr <= ELF_BR_OFFSET(7))
+		return access_elf_breg(target, info, addr, data, write_access);
+	else
+		return access_elf_areg(target, info, addr, data, write_access);
+}
+
+struct regset_membuf {
+	struct membuf to;
+	int ret;
+};
+
+static void do_gpregs_get(struct unw_frame_info *info, void *arg)
+{
+	struct regset_membuf *dst = arg;
+	struct membuf to = dst->to;
+	unsigned int n;
+	elf_greg_t reg;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/*
+	 * coredump format:
+	 *      r0-r31
+	 *      NaT bits (for r0-r31; bit N == 1 iff rN is a NaT)
+	 *      predicate registers (p0-p63)
+	 *      b0-b7
+	 *      ip cfm user-mask
+	 *      ar.rsc ar.bsp ar.bspstore ar.rnat
+	 *      ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec
+	 */
+
+
+	/* Skip r0 */
+	membuf_zero(&to, 8);
+	for (n = 8; to.left && n < ELF_AR_END_OFFSET; n += 8) {
+		if (access_elf_reg(info->task, info, n, &reg, 0) < 0) {
+			dst->ret = -EIO;
+			return;
+		}
+		membuf_store(&to, reg);
+	}
+}
+
+static void do_gpregs_set(struct unw_frame_info *info, void *arg)
+{
+	struct regset_getset *dst = arg;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	if (!dst->count)
+		return;
+	/* Skip r0 */
+	if (dst->pos < ELF_GR_OFFSET(1)) {
+		dst->ret = user_regset_copyin_ignore(&dst->pos, &dst->count,
+						       &dst->u.set.kbuf,
+						       &dst->u.set.ubuf,
+						       0, ELF_GR_OFFSET(1));
+		if (dst->ret)
+			return;
+	}
+
+	while (dst->count && dst->pos < ELF_AR_END_OFFSET) {
+		unsigned int n, from, to;
+		elf_greg_t tmp[16];
+
+		from = dst->pos;
+		to = from + sizeof(tmp);
+		if (to > ELF_AR_END_OFFSET)
+			to = ELF_AR_END_OFFSET;
+		/* get up to 16 values */
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+				&dst->u.set.kbuf, &dst->u.set.ubuf, tmp,
+				from, to);
+		if (dst->ret)
+			return;
+		/* now copy them into registers */
+		for (n = 0; from < dst->pos; from += sizeof(elf_greg_t), n++)
+			if (access_elf_reg(dst->target, info, from,
+						&tmp[n], 1) < 0) {
+				dst->ret = -EIO;
+				return;
+			}
+	}
+}
+
+#define ELF_FP_OFFSET(i)	(i * sizeof(elf_fpreg_t))
+
+static void do_fpregs_get(struct unw_frame_info *info, void *arg)
+{
+	struct task_struct *task = info->task;
+	struct regset_membuf *dst = arg;
+	struct membuf to = dst->to;
+	elf_fpreg_t reg;
+	unsigned int n;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/* Skip pos 0 and 1 */
+	membuf_zero(&to, 2 * sizeof(elf_fpreg_t));
+
+	/* fr2-fr31 */
+	for (n = 2; to.left && n < 32; n++) {
+		if (unw_get_fr(info, n, &reg)) {
+			dst->ret = -EIO;
+			return;
+		}
+		membuf_write(&to, &reg, sizeof(reg));
+	}
+
+	/* fph */
+	if (!to.left)
+		return;
+
+	ia64_flush_fph(task);
+	if (task->thread.flags & IA64_THREAD_FPH_VALID)
+		membuf_write(&to, &task->thread.fph, 96 * sizeof(reg));
+	else
+		membuf_zero(&to, 96 * sizeof(reg));
+}
+
+static void do_fpregs_set(struct unw_frame_info *info, void *arg)
+{
+	struct regset_getset *dst = arg;
+	elf_fpreg_t fpreg, tmp[30];
+	int index, start, end;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/* Skip pos 0 and 1 */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(2)) {
+		dst->ret = user_regset_copyin_ignore(&dst->pos, &dst->count,
+						       &dst->u.set.kbuf,
+						       &dst->u.set.ubuf,
+						       0, ELF_FP_OFFSET(2));
+		if (dst->count == 0 || dst->ret)
+			return;
+	}
+
+	/* fr2-fr31 */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(32)) {
+		start = dst->pos;
+		end = min(((unsigned int)ELF_FP_OFFSET(32)),
+			 dst->pos + dst->count);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+				&dst->u.set.kbuf, &dst->u.set.ubuf, tmp,
+				ELF_FP_OFFSET(2), ELF_FP_OFFSET(32));
+		if (dst->ret)
+			return;
+
+		if (start & 0xF) { /* only write high part */
+			if (unw_get_fr(info, start / sizeof(elf_fpreg_t),
+					 &fpreg)) {
+				dst->ret = -EIO;
+				return;
+			}
+			tmp[start / sizeof(elf_fpreg_t) - 2].u.bits[0]
+				= fpreg.u.bits[0];
+			start &= ~0xFUL;
+		}
+		if (end & 0xF) { /* only write low part */
+			if (unw_get_fr(info, end / sizeof(elf_fpreg_t),
+					&fpreg)) {
+				dst->ret = -EIO;
+				return;
+			}
+			tmp[end / sizeof(elf_fpreg_t) - 2].u.bits[1]
+				= fpreg.u.bits[1];
+			end = (end + 0xF) & ~0xFUL;
+		}
+
+		for ( ;	start < end ; start += sizeof(elf_fpreg_t)) {
+			index = start / sizeof(elf_fpreg_t);
+			if (unw_set_fr(info, index, tmp[index - 2])) {
+				dst->ret = -EIO;
+				return;
+			}
+		}
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* fph */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(128)) {
+		ia64_sync_fph(dst->target);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+						&dst->u.set.kbuf,
+						&dst->u.set.ubuf,
+						&dst->target->thread.fph,
+						ELF_FP_OFFSET(32), -1);
+	}
+}
+
+static void
+unwind_and_call(void (*call)(struct unw_frame_info *, void *),
+	       struct task_struct *target, void *data)
+{
+	if (target == current)
+		unw_init_running(call, data);
+	else {
+		struct unw_frame_info info;
+		memset(&info, 0, sizeof(info));
+		unw_init_from_blocked_task(&info, target);
+		(*call)(&info, data);
+	}
+}
+
+static int
+do_regset_call(void (*call)(struct unw_frame_info *, void *),
+	       struct task_struct *target,
+	       const struct user_regset *regset,
+	       unsigned int pos, unsigned int count,
+	       const void *kbuf, const void __user *ubuf)
+{
+	struct regset_getset info = { .target = target, .regset = regset,
+				 .pos = pos, .count = count,
+				 .u.set = { .kbuf = kbuf, .ubuf = ubuf },
+				 .ret = 0 };
+	unwind_and_call(call, target, &info);
+	return info.ret;
+}
+
+static int
+gpregs_get(struct task_struct *target,
+	   const struct user_regset *regset,
+	   struct membuf to)
+{
+	struct regset_membuf info = {.to = to};
+	unwind_and_call(do_gpregs_get, target, &info);
+	return info.ret;
+}
+
+static int gpregs_set(struct task_struct *target,
+		const struct user_regset *regset,
+		unsigned int pos, unsigned int count,
+		const void *kbuf, const void __user *ubuf)
+{
+	return do_regset_call(do_gpregs_set, target, regset, pos, count,
+		kbuf, ubuf);
+}
+
+static void do_gpregs_writeback(struct unw_frame_info *info, void *arg)
+{
+	do_sync_rbs(info, ia64_sync_user_rbs);
+}
+
+/*
+ * This is called to write back the register backing store.
+ * ptrace does this before it stops, so that a tracer reading the user
+ * memory after the thread stops will get the current register data.
+ */
+static int
+gpregs_writeback(struct task_struct *target,
+		 const struct user_regset *regset,
+		 int now)
+{
+	if (test_and_set_tsk_thread_flag(target, TIF_RESTORE_RSE))
+		return 0;
+	set_notify_resume(target);
+	return do_regset_call(do_gpregs_writeback, target, regset, 0, 0,
+		NULL, NULL);
+}
+
+static int
+fpregs_active(struct task_struct *target, const struct user_regset *regset)
+{
+	return (target->thread.flags & IA64_THREAD_FPH_VALID) ? 128 : 32;
+}
+
+static int fpregs_get(struct task_struct *target,
+		const struct user_regset *regset,
+		struct membuf to)
+{
+	struct regset_membuf info = {.to = to};
+	unwind_and_call(do_fpregs_get, target, &info);
+	return info.ret;
+}
+
+static int fpregs_set(struct task_struct *target,
+		const struct user_regset *regset,
+		unsigned int pos, unsigned int count,
+		const void *kbuf, const void __user *ubuf)
+{
+	return do_regset_call(do_fpregs_set, target, regset, pos, count,
+		kbuf, ubuf);
+}
+
+static int
+access_uarea(struct task_struct *child, unsigned long addr,
+	      unsigned long *data, int write_access)
+{
+	unsigned int pos = -1; /* an invalid value */
+	unsigned long *ptr, regnum;
+
+	if ((addr & 0x7) != 0) {
+		dprintk("ptrace: unaligned register address 0x%lx\n", addr);
+		return -1;
+	}
+	if ((addr >= PT_NAT_BITS + 8 && addr < PT_F2) ||
+		(addr >= PT_R7 + 8 && addr < PT_B1) ||
+		(addr >= PT_AR_LC + 8 && addr < PT_CR_IPSR) ||
+		(addr >= PT_AR_SSD + 8 && addr < PT_DBR)) {
+		dprintk("ptrace: rejecting access to register "
+					"address 0x%lx\n", addr);
+		return -1;
+	}
+
+	switch (addr) {
+	case PT_F32 ... (PT_F127 + 15):
+		pos = addr - PT_F32 + ELF_FP_OFFSET(32);
+		break;
+	case PT_F2 ... (PT_F5 + 15):
+		pos = addr - PT_F2 + ELF_FP_OFFSET(2);
+		break;
+	case PT_F10 ... (PT_F31 + 15):
+		pos = addr - PT_F10 + ELF_FP_OFFSET(10);
+		break;
+	case PT_F6 ... (PT_F9 + 15):
+		pos = addr - PT_F6 + ELF_FP_OFFSET(6);
+		break;
+	}
+
+	if (pos != -1) {
+		unsigned reg = pos / sizeof(elf_fpreg_t);
+		int which_half = (pos / sizeof(unsigned long)) & 1;
+
+		if (reg < 32) { /* fr2-fr31 */
+			struct unw_frame_info info;
+			elf_fpreg_t fpreg;
+
+			memset(&info, 0, sizeof(info));
+			unw_init_from_blocked_task(&info, child);
+			if (unw_unwind_to_user(&info) < 0)
+				return 0;
+
+			if (unw_get_fr(&info, reg, &fpreg))
+				return -1;
+			if (write_access) {
+				fpreg.u.bits[which_half] = *data;
+				if (unw_set_fr(&info, reg, fpreg))
+					return -1;
+			} else {
+				*data = fpreg.u.bits[which_half];
+			}
+		} else { /* fph */
+			elf_fpreg_t *p = &child->thread.fph[reg - 32];
+			unsigned long *bits = &p->u.bits[which_half];
+
+			ia64_sync_fph(child);
+			if (write_access)
+				*bits = *data;
+			else if (child->thread.flags & IA64_THREAD_FPH_VALID)
+				*data = *bits;
+			else
+				*data = 0;
+		}
+		return 0;
+	}
+
+	switch (addr) {
+	case PT_NAT_BITS:
+		pos = ELF_NAT_OFFSET;
+		break;
+	case PT_R4 ... PT_R7:
+		pos = addr - PT_R4 + ELF_GR_OFFSET(4);
+		break;
+	case PT_B1 ... PT_B5:
+		pos = addr - PT_B1 + ELF_BR_OFFSET(1);
+		break;
+	case PT_AR_EC:
+		pos = ELF_AR_EC_OFFSET;
+		break;
+	case PT_AR_LC:
+		pos = ELF_AR_LC_OFFSET;
+		break;
+	case PT_CR_IPSR:
+		pos = ELF_CR_IPSR_OFFSET;
+		break;
+	case PT_CR_IIP:
+		pos = ELF_CR_IIP_OFFSET;
+		break;
+	case PT_CFM:
+		pos = ELF_CFM_OFFSET;
+		break;
+	case PT_AR_UNAT:
+		pos = ELF_AR_UNAT_OFFSET;
+		break;
+	case PT_AR_PFS:
+		pos = ELF_AR_PFS_OFFSET;
+		break;
+	case PT_AR_RSC:
+		pos = ELF_AR_RSC_OFFSET;
+		break;
+	case PT_AR_RNAT:
+		pos = ELF_AR_RNAT_OFFSET;
+		break;
+	case PT_AR_BSPSTORE:
+		pos = ELF_AR_BSPSTORE_OFFSET;
+		break;
+	case PT_PR:
+		pos = ELF_PR_OFFSET;
+		break;
+	case PT_B6:
+		pos = ELF_BR_OFFSET(6);
+		break;
+	case PT_AR_BSP:
+		pos = ELF_AR_BSP_OFFSET;
+		break;
+	case PT_R1 ... PT_R3:
+		pos = addr - PT_R1 + ELF_GR_OFFSET(1);
+		break;
+	case PT_R12 ... PT_R15:
+		pos = addr - PT_R12 + ELF_GR_OFFSET(12);
+		break;
+	case PT_R8 ... PT_R11:
+		pos = addr - PT_R8 + ELF_GR_OFFSET(8);
+		break;
+	case PT_R16 ... PT_R31:
+		pos = addr - PT_R16 + ELF_GR_OFFSET(16);
+		break;
+	case PT_AR_CCV:
+		pos = ELF_AR_CCV_OFFSET;
+		break;
+	case PT_AR_FPSR:
+		pos = ELF_AR_FPSR_OFFSET;
+		break;
+	case PT_B0:
+		pos = ELF_BR_OFFSET(0);
+		break;
+	case PT_B7:
+		pos = ELF_BR_OFFSET(7);
+		break;
+	case PT_AR_CSD:
+		pos = ELF_AR_CSD_OFFSET;
+		break;
+	case PT_AR_SSD:
+		pos = ELF_AR_SSD_OFFSET;
+		break;
+	}
+
+	if (pos != -1) {
+		struct unw_frame_info info;
+
+		memset(&info, 0, sizeof(info));
+		unw_init_from_blocked_task(&info, child);
+		if (unw_unwind_to_user(&info) < 0)
+			return 0;
+
+		return access_elf_reg(child, &info, pos, data, write_access);
+	}
+
+	/* access debug registers */
+	if (addr >= PT_IBR) {
+		regnum = (addr - PT_IBR) >> 3;
+		ptr = &child->thread.ibr[0];
+	} else {
+		regnum = (addr - PT_DBR) >> 3;
+		ptr = &child->thread.dbr[0];
+	}
+
+	if (regnum >= 8) {
+		dprintk("ptrace: rejecting access to register "
+				"address 0x%lx\n", addr);
+		return -1;
+	}
+
+	if (!(child->thread.flags & IA64_THREAD_DBG_VALID)) {
+		child->thread.flags |= IA64_THREAD_DBG_VALID;
+		memset(child->thread.dbr, 0,
+				sizeof(child->thread.dbr));
+		memset(child->thread.ibr, 0,
+				sizeof(child->thread.ibr));
+	}
+
+	ptr += regnum;
+
+	if ((regnum & 1) && write_access) {
+		/* don't let the user set kernel-level breakpoints: */
+		*ptr = *data & ~(7UL << 56);
+		return 0;
+	}
+	if (write_access)
+		*ptr = *data;
+	else
+		*data = *ptr;
+	return 0;
+}
+
+static const struct user_regset native_regsets[] = {
+	{
+		.core_note_type = NT_PRSTATUS,
+		.n = ELF_NGREG,
+		.size = sizeof(elf_greg_t), .align = sizeof(elf_greg_t),
+		.regset_get = gpregs_get, .set = gpregs_set,
+		.writeback = gpregs_writeback
+	},
+	{
+		.core_note_type = NT_PRFPREG,
+		.n = ELF_NFPREG,
+		.size = sizeof(elf_fpreg_t), .align = sizeof(elf_fpreg_t),
+		.regset_get = fpregs_get, .set = fpregs_set, .active = fpregs_active
+	},
+};
+
+static const struct user_regset_view user_ia64_view = {
+	.name = "ia64",
+	.e_machine = EM_IA_64,
+	.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *tsk)
+{
+	return &user_ia64_view;
+}
+
+struct syscall_get_args {
+	unsigned int i;
+	unsigned int n;
+	unsigned long *args;
+	struct pt_regs *regs;
+};
+
+static void syscall_get_args_cb(struct unw_frame_info *info, void *data)
+{
+	struct syscall_get_args *args = data;
+	struct pt_regs *pt = args->regs;
+	unsigned long *krbs, cfm, ndirty, nlocals, nouts;
+	int i, count;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/*
+	 * We get here via a few paths:
+	 * - break instruction: cfm is shared with caller.
+	 *   syscall args are in out= regs, locals are non-empty.
+	 * - epsinstruction: cfm is set by br.call
+	 *   locals don't exist.
+	 *
+	 * For both cases arguments are reachable in cfm.sof - cfm.sol.
+	 * CFM: [ ... | sor: 17..14 | sol : 13..7 | sof : 6..0 ]
+	 */
+	cfm = pt->cr_ifs;
+	nlocals = (cfm >> 7) & 0x7f; /* aka sol */
+	nouts = (cfm & 0x7f) - nlocals; /* aka sof - sol */
+	krbs = (unsigned long *)info->task + IA64_RBS_OFFSET/8;
+	ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19));
+
+	count = 0;
+	if (in_syscall(pt))
+		count = min_t(int, args->n, nouts);
+
+	/* Iterate over outs. */
+	for (i = 0; i < count; i++) {
+		int j = ndirty + nlocals + i + args->i;
+		args->args[i] = *ia64_rse_skip_regs(krbs, j);
+	}
+
+	while (i < args->n) {
+		args->args[i] = 0;
+		i++;
+	}
+}
+
+void syscall_get_arguments(struct task_struct *task,
+	struct pt_regs *regs, unsigned long *args)
+{
+	struct syscall_get_args data = {
+		.i = 0,
+		.n = 6,
+		.args = args,
+		.regs = regs,
+	};
+
+	if (task == current)
+		unw_init_running(syscall_get_args_cb, &data);
+	else {
+		struct unw_frame_info ufi;
+		memset(&ufi, 0, sizeof(ufi));
+		unw_init_from_blocked_task(&ufi, task);
+		syscall_get_args_cb(&ufi, &data);
+	}
+}
diff --git a/arch/ia64/kernel/relocate_kernel.S b/arch/ia64/kernel/relocate_kernel.S
new file mode 100644
index 000000000..527a7b896
--- /dev/null
+++ b/arch/ia64/kernel/relocate_kernel.S
@@ -0,0 +1,321 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * arch/ia64/kernel/relocate_kernel.S
+ *
+ * Relocate kexec'able kernel and start it
+ *
+ * Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
+ * Copyright (C) 2005 Khalid Aziz  <khalid.aziz@hp.com>
+ * Copyright (C) 2005 Intel Corp,  Zou Nan hai <nanhai.zou@intel.com>
+ */
+#include <linux/pgtable.h>
+#include <asm/asmmacro.h>
+#include <asm/kregs.h>
+#include <asm/page.h>
+#include <asm/mca_asm.h>
+
+       /* Must be relocatable PIC code callable as a C function
+        */
+GLOBAL_ENTRY(relocate_new_kernel)
+	.prologue
+	alloc r31=ar.pfs,4,0,0,0
+        .body
+.reloc_entry:
+{
+	rsm psr.i| psr.ic
+	mov r2=ip
+}
+	;;
+{
+        flushrs                         // must be first insn in group
+        srlz.i
+}
+	;;
+	dep r2=0,r2,61,3		//to physical address
+	;;
+	//first switch to physical mode
+	add r3=1f-.reloc_entry, r2
+	movl r16 = IA64_PSR_AC|IA64_PSR_BN|IA64_PSR_IC
+	mov ar.rsc=0	          	// put RSE in enforced lazy mode
+	;;
+	add sp=(memory_stack_end - 16 - .reloc_entry),r2
+	add r8=(register_stack - .reloc_entry),r2
+	;;
+	mov r18=ar.rnat
+	mov ar.bspstore=r8
+	;;
+        mov cr.ipsr=r16
+        mov cr.iip=r3
+        mov cr.ifs=r0
+	srlz.i
+	;;
+	mov ar.rnat=r18
+	rfi				// note: this unmask MCA/INIT (psr.mc)
+	;;
+1:
+	//physical mode code begin
+	mov b6=in1
+	dep r28=0,in2,61,3	//to physical address
+
+	// purge all TC entries
+#define O(member)       IA64_CPUINFO_##member##_OFFSET
+        GET_THIS_PADDR(r2, ia64_cpu_info) // load phys addr of cpu_info into r2
+        ;;
+        addl r17=O(PTCE_STRIDE),r2
+        addl r2=O(PTCE_BASE),r2
+        ;;
+        ld8 r18=[r2],(O(PTCE_COUNT)-O(PTCE_BASE));;    	// r18=ptce_base
+        ld4 r19=[r2],4                                  // r19=ptce_count[0]
+        ld4 r21=[r17],4                                 // r21=ptce_stride[0]
+        ;;
+        ld4 r20=[r2]                                    // r20=ptce_count[1]
+        ld4 r22=[r17]                                   // r22=ptce_stride[1]
+        mov r24=r0
+        ;;
+        adds r20=-1,r20
+        ;;
+#undef O
+2:
+        cmp.ltu p6,p7=r24,r19
+(p7)    br.cond.dpnt.few 4f
+        mov ar.lc=r20
+3:
+        ptc.e r18
+        ;;
+        add r18=r22,r18
+        br.cloop.sptk.few 3b
+        ;;
+        add r18=r21,r18
+        add r24=1,r24
+        ;;
+        br.sptk.few 2b
+4:
+        srlz.i
+        ;;
+	// purge TR entry for kernel text and data
+        movl r16=KERNEL_START
+        mov r18=KERNEL_TR_PAGE_SHIFT<<2
+        ;;
+        ptr.i r16, r18
+        ptr.d r16, r18
+        ;;
+        srlz.i
+        ;;
+
+        // purge TR entry for pal code
+        mov r16=in3
+        mov r18=IA64_GRANULE_SHIFT<<2
+        ;;
+        ptr.i r16,r18
+        ;;
+        srlz.i
+	;;
+
+        // purge TR entry for stack
+        mov r16=IA64_KR(CURRENT_STACK)
+        ;;
+        shl r16=r16,IA64_GRANULE_SHIFT
+        movl r19=PAGE_OFFSET
+        ;;
+        add r16=r19,r16
+        mov r18=IA64_GRANULE_SHIFT<<2
+        ;;
+        ptr.d r16,r18
+        ;;
+        srlz.i
+	;;
+
+	//copy segments
+	movl r16=PAGE_MASK
+        mov  r30=in0                    // in0 is page_list
+        br.sptk.few .dest_page
+	;;
+.loop:
+	ld8  r30=[in0], 8;;
+.dest_page:
+	tbit.z p0, p6=r30, 0;;    	// 0x1 dest page
+(p6)	and r17=r30, r16
+(p6)	br.cond.sptk.few .loop;;
+
+	tbit.z p0, p6=r30, 1;;		// 0x2 indirect page
+(p6)	and in0=r30, r16
+(p6)	br.cond.sptk.few .loop;;
+
+	tbit.z p0, p6=r30, 2;;		// 0x4 end flag
+(p6)	br.cond.sptk.few .end_loop;;
+
+	tbit.z p6, p0=r30, 3;;		// 0x8 source page
+(p6)	br.cond.sptk.few .loop
+
+	and r18=r30, r16
+
+	// simple copy page, may optimize later
+	movl r14=PAGE_SIZE/8 - 1;;
+	mov ar.lc=r14;;
+1:
+	ld8 r14=[r18], 8;;
+	st8 [r17]=r14;;
+	fc.i r17
+	add r17=8, r17
+	br.ctop.sptk.few 1b
+	br.sptk.few .loop
+	;;
+
+.end_loop:
+	sync.i			// for fc.i
+	;;
+	srlz.i
+	;;
+	srlz.d
+	;;
+	br.call.sptk.many b0=b6;;
+
+.align  32
+memory_stack:
+	.fill           8192, 1, 0
+memory_stack_end:
+register_stack:
+	.fill           8192, 1, 0
+register_stack_end:
+relocate_new_kernel_end:
+END(relocate_new_kernel)
+
+.global relocate_new_kernel_size
+relocate_new_kernel_size:
+	data8	relocate_new_kernel_end - relocate_new_kernel
+
+GLOBAL_ENTRY(ia64_dump_cpu_regs)
+        .prologue
+        alloc loc0=ar.pfs,1,2,0,0
+        .body
+        mov     ar.rsc=0                // put RSE in enforced lazy mode
+        add     loc1=4*8, in0           // save r4 and r5 first
+        ;;
+{
+        flushrs                         // flush dirty regs to backing store
+        srlz.i
+}
+        st8 [loc1]=r4, 8
+        ;;
+        st8 [loc1]=r5, 8
+        ;;
+        add loc1=32*8, in0
+        mov r4=ar.rnat
+        ;;
+        st8 [in0]=r0, 8			// r0
+        st8 [loc1]=r4, 8		// rnat
+        mov r5=pr
+        ;;
+        st8 [in0]=r1, 8			// r1
+        st8 [loc1]=r5, 8		// pr
+        mov r4=b0
+        ;;
+        st8 [in0]=r2, 8			// r2
+        st8 [loc1]=r4, 8		// b0
+        mov r5=b1;
+        ;;
+        st8 [in0]=r3, 24		// r3
+        st8 [loc1]=r5, 8		// b1
+        mov r4=b2
+        ;;
+        st8 [in0]=r6, 8			// r6
+        st8 [loc1]=r4, 8		// b2
+	mov r5=b3
+        ;;
+        st8 [in0]=r7, 8			// r7
+        st8 [loc1]=r5, 8		// b3
+        mov r4=b4
+        ;;
+        st8 [in0]=r8, 8			// r8
+        st8 [loc1]=r4, 8		// b4
+        mov r5=b5
+        ;;
+        st8 [in0]=r9, 8			// r9
+        st8 [loc1]=r5, 8		// b5
+        mov r4=b6
+        ;;
+        st8 [in0]=r10, 8		// r10
+        st8 [loc1]=r5, 8		// b6
+        mov r5=b7
+        ;;
+        st8 [in0]=r11, 8		// r11
+        st8 [loc1]=r5, 8		// b7
+        mov r4=b0
+        ;;
+        st8 [in0]=r12, 8		// r12
+        st8 [loc1]=r4, 8		// ip
+        mov r5=loc0
+	;;
+        st8 [in0]=r13, 8		// r13
+        extr.u r5=r5, 0, 38		// ar.pfs.pfm
+	mov r4=r0			// user mask
+        ;;
+        st8 [in0]=r14, 8		// r14
+        st8 [loc1]=r5, 8		// cfm
+        ;;
+        st8 [in0]=r15, 8		// r15
+        st8 [loc1]=r4, 8        	// user mask
+	mov r5=ar.rsc
+        ;;
+        st8 [in0]=r16, 8		// r16
+        st8 [loc1]=r5, 8        	// ar.rsc
+        mov r4=ar.bsp
+        ;;
+        st8 [in0]=r17, 8		// r17
+        st8 [loc1]=r4, 8        	// ar.bsp
+        mov r5=ar.bspstore
+        ;;
+        st8 [in0]=r18, 8		// r18
+        st8 [loc1]=r5, 8        	// ar.bspstore
+        mov r4=ar.rnat
+        ;;
+        st8 [in0]=r19, 8		// r19
+        st8 [loc1]=r4, 8        	// ar.rnat
+        mov r5=ar.ccv
+        ;;
+        st8 [in0]=r20, 8		// r20
+	st8 [loc1]=r5, 8        	// ar.ccv
+        mov r4=ar.unat
+        ;;
+        st8 [in0]=r21, 8		// r21
+        st8 [loc1]=r4, 8        	// ar.unat
+        mov r5 = ar.fpsr
+        ;;
+        st8 [in0]=r22, 8		// r22
+        st8 [loc1]=r5, 8        	// ar.fpsr
+        mov r4 = ar.unat
+        ;;
+        st8 [in0]=r23, 8		// r23
+        st8 [loc1]=r4, 8        	// unat
+        mov r5 = ar.fpsr
+        ;;
+        st8 [in0]=r24, 8		// r24
+        st8 [loc1]=r5, 8        	// fpsr
+        mov r4 = ar.pfs
+        ;;
+        st8 [in0]=r25, 8		// r25
+        st8 [loc1]=r4, 8        	// ar.pfs
+        mov r5 = ar.lc
+        ;;
+        st8 [in0]=r26, 8		// r26
+        st8 [loc1]=r5, 8        	// ar.lc
+        mov r4 = ar.ec
+        ;;
+        st8 [in0]=r27, 8		// r27
+        st8 [loc1]=r4, 8        	// ar.ec
+        mov r5 = ar.csd
+        ;;
+        st8 [in0]=r28, 8		// r28
+        st8 [loc1]=r5, 8        	// ar.csd
+        mov r4 = ar.ssd
+        ;;
+        st8 [in0]=r29, 8		// r29
+        st8 [loc1]=r4, 8        	// ar.ssd
+        ;;
+        st8 [in0]=r30, 8		// r30
+        ;;
+	st8 [in0]=r31, 8		// r31
+        mov ar.pfs=loc0
+        ;;
+        br.ret.sptk.many rp
+END(ia64_dump_cpu_regs)
diff --git a/arch/ia64/kernel/sal.c b/arch/ia64/kernel/sal.c
new file mode 100644
index 000000000..e4f0705c0
--- /dev/null
+++ b/arch/ia64/kernel/sal.c
@@ -0,0 +1,400 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * System Abstraction Layer (SAL) interface routines.
+ *
+ * Copyright (C) 1998, 1999, 2001, 2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+
+#include <asm/delay.h>
+#include <asm/page.h>
+#include <asm/sal.h>
+#include <asm/pal.h>
+#include <asm/xtp.h>
+
+ __cacheline_aligned DEFINE_SPINLOCK(sal_lock);
+unsigned long sal_platform_features;
+
+unsigned short sal_revision;
+unsigned short sal_version;
+
+#define SAL_MAJOR(x) ((x) >> 8)
+#define SAL_MINOR(x) ((x) & 0xff)
+
+static struct {
+	void *addr;	/* function entry point */
+	void *gpval;	/* gp value to use */
+} pdesc;
+
+static long
+default_handler (void)
+{
+	return -1;
+}
+
+ia64_sal_handler ia64_sal = (ia64_sal_handler) default_handler;
+ia64_sal_desc_ptc_t *ia64_ptc_domain_info;
+
+const char *
+ia64_sal_strerror (long status)
+{
+	const char *str;
+	switch (status) {
+	      case 0: str = "Call completed without error"; break;
+	      case 1: str = "Effect a warm boot of the system to complete "
+			      "the update"; break;
+	      case -1: str = "Not implemented"; break;
+	      case -2: str = "Invalid argument"; break;
+	      case -3: str = "Call completed with error"; break;
+	      case -4: str = "Virtual address not registered"; break;
+	      case -5: str = "No information available"; break;
+	      case -6: str = "Insufficient space to add the entry"; break;
+	      case -7: str = "Invalid entry_addr value"; break;
+	      case -8: str = "Invalid interrupt vector"; break;
+	      case -9: str = "Requested memory not available"; break;
+	      case -10: str = "Unable to write to the NVM device"; break;
+	      case -11: str = "Invalid partition type specified"; break;
+	      case -12: str = "Invalid NVM_Object id specified"; break;
+	      case -13: str = "NVM_Object already has the maximum number "
+				"of partitions"; break;
+	      case -14: str = "Insufficient space in partition for the "
+				"requested write sub-function"; break;
+	      case -15: str = "Insufficient data buffer space for the "
+				"requested read record sub-function"; break;
+	      case -16: str = "Scratch buffer required for the write/delete "
+				"sub-function"; break;
+	      case -17: str = "Insufficient space in the NVM_Object for the "
+				"requested create sub-function"; break;
+	      case -18: str = "Invalid value specified in the partition_rec "
+				"argument"; break;
+	      case -19: str = "Record oriented I/O not supported for this "
+				"partition"; break;
+	      case -20: str = "Bad format of record to be written or "
+				"required keyword variable not "
+				"specified"; break;
+	      default: str = "Unknown SAL status code"; break;
+	}
+	return str;
+}
+
+void __init
+ia64_sal_handler_init (void *entry_point, void *gpval)
+{
+	/* fill in the SAL procedure descriptor and point ia64_sal to it: */
+	pdesc.addr = entry_point;
+	pdesc.gpval = gpval;
+	ia64_sal = (ia64_sal_handler) &pdesc;
+}
+
+static void __init
+check_versions (struct ia64_sal_systab *systab)
+{
+	sal_revision = (systab->sal_rev_major << 8) | systab->sal_rev_minor;
+	sal_version = (systab->sal_b_rev_major << 8) | systab->sal_b_rev_minor;
+
+	/* Check for broken firmware */
+	if ((sal_revision == SAL_VERSION_CODE(49, 29))
+	    && (sal_version == SAL_VERSION_CODE(49, 29)))
+	{
+		/*
+		 * Old firmware for zx2000 prototypes have this weird version number,
+		 * reset it to something sane.
+		 */
+		sal_revision = SAL_VERSION_CODE(2, 8);
+		sal_version = SAL_VERSION_CODE(0, 0);
+	}
+}
+
+static void __init
+sal_desc_entry_point (void *p)
+{
+	struct ia64_sal_desc_entry_point *ep = p;
+	ia64_pal_handler_init(__va(ep->pal_proc));
+	ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
+}
+
+#ifdef CONFIG_SMP
+static void __init
+set_smp_redirect (int flag)
+{
+#ifndef CONFIG_HOTPLUG_CPU
+	if (no_int_routing)
+		smp_int_redirect &= ~flag;
+	else
+		smp_int_redirect |= flag;
+#else
+	/*
+	 * For CPU Hotplug we dont want to do any chipset supported
+	 * interrupt redirection. The reason is this would require that
+	 * All interrupts be stopped and hard bind the irq to a cpu.
+	 * Later when the interrupt is fired we need to set the redir hint
+	 * on again in the vector. This is cumbersome for something that the
+	 * user mode irq balancer will solve anyways.
+	 */
+	no_int_routing=1;
+	smp_int_redirect &= ~flag;
+#endif
+}
+#else
+#define set_smp_redirect(flag)	do { } while (0)
+#endif
+
+static void __init
+sal_desc_platform_feature (void *p)
+{
+	struct ia64_sal_desc_platform_feature *pf = p;
+	sal_platform_features = pf->feature_mask;
+
+	printk(KERN_INFO "SAL Platform features:");
+	if (!sal_platform_features) {
+		printk(" None\n");
+		return;
+	}
+
+	if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
+		printk(" BusLock");
+	if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
+		printk(" IRQ_Redirection");
+		set_smp_redirect(SMP_IRQ_REDIRECTION);
+	}
+	if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
+		printk(" IPI_Redirection");
+		set_smp_redirect(SMP_IPI_REDIRECTION);
+	}
+	if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
+		printk(" ITC_Drift");
+	printk("\n");
+}
+
+#ifdef CONFIG_SMP
+static void __init
+sal_desc_ap_wakeup (void *p)
+{
+	struct ia64_sal_desc_ap_wakeup *ap = p;
+
+	switch (ap->mechanism) {
+	case IA64_SAL_AP_EXTERNAL_INT:
+		ap_wakeup_vector = ap->vector;
+		printk(KERN_INFO "SAL: AP wakeup using external interrupt "
+				"vector 0x%lx\n", ap_wakeup_vector);
+		break;
+	default:
+		printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
+		break;
+	}
+}
+
+static void __init
+chk_nointroute_opt(void)
+{
+	char *cp;
+
+	for (cp = boot_command_line; *cp; ) {
+		if (memcmp(cp, "nointroute", 10) == 0) {
+			no_int_routing = 1;
+			printk ("no_int_routing on\n");
+			break;
+		} else {
+			while (*cp != ' ' && *cp)
+				++cp;
+			while (*cp == ' ')
+				++cp;
+		}
+	}
+}
+
+#else
+static void __init sal_desc_ap_wakeup(void *p) { }
+#endif
+
+/*
+ * HP rx5670 firmware polls for interrupts during SAL_CACHE_FLUSH by reading
+ * cr.ivr, but it never writes cr.eoi.  This leaves any interrupt marked as
+ * "in-service" and masks other interrupts of equal or lower priority.
+ *
+ * HP internal defect reports: F1859, F2775, F3031.
+ */
+static int sal_cache_flush_drops_interrupts;
+
+static int __init
+force_pal_cache_flush(char *str)
+{
+	sal_cache_flush_drops_interrupts = 1;
+	return 0;
+}
+early_param("force_pal_cache_flush", force_pal_cache_flush);
+
+void __init
+check_sal_cache_flush (void)
+{
+	unsigned long flags;
+	int cpu;
+	u64 vector, cache_type = 3;
+	struct ia64_sal_retval isrv;
+
+	if (sal_cache_flush_drops_interrupts)
+		return;
+
+	cpu = get_cpu();
+	local_irq_save(flags);
+
+	/*
+	 * Send ourselves a timer interrupt, wait until it's reported, and see
+	 * if SAL_CACHE_FLUSH drops it.
+	 */
+	ia64_send_ipi(cpu, IA64_TIMER_VECTOR, IA64_IPI_DM_INT, 0);
+
+	while (!ia64_get_irr(IA64_TIMER_VECTOR))
+		cpu_relax();
+
+	SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
+
+	if (isrv.status)
+		printk(KERN_ERR "SAL_CAL_FLUSH failed with %ld\n", isrv.status);
+
+	if (ia64_get_irr(IA64_TIMER_VECTOR)) {
+		vector = ia64_get_ivr();
+		ia64_eoi();
+		WARN_ON(vector != IA64_TIMER_VECTOR);
+	} else {
+		sal_cache_flush_drops_interrupts = 1;
+		printk(KERN_ERR "SAL: SAL_CACHE_FLUSH drops interrupts; "
+			"PAL_CACHE_FLUSH will be used instead\n");
+		ia64_eoi();
+	}
+
+	local_irq_restore(flags);
+	put_cpu();
+}
+
+s64
+ia64_sal_cache_flush (u64 cache_type)
+{
+	struct ia64_sal_retval isrv;
+
+	if (sal_cache_flush_drops_interrupts) {
+		unsigned long flags;
+		u64 progress;
+		s64 rc;
+
+		progress = 0;
+		local_irq_save(flags);
+		rc = ia64_pal_cache_flush(cache_type,
+			PAL_CACHE_FLUSH_INVALIDATE, &progress, NULL);
+		local_irq_restore(flags);
+		return rc;
+	}
+
+	SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
+	return isrv.status;
+}
+EXPORT_SYMBOL_GPL(ia64_sal_cache_flush);
+
+void __init
+ia64_sal_init (struct ia64_sal_systab *systab)
+{
+	char *p;
+	int i;
+
+	if (!systab) {
+		printk(KERN_WARNING "Hmm, no SAL System Table.\n");
+		return;
+	}
+
+	if (strncmp(systab->signature, "SST_", 4) != 0)
+		printk(KERN_ERR "bad signature in system table!");
+
+	check_versions(systab);
+#ifdef CONFIG_SMP
+	chk_nointroute_opt();
+#endif
+
+	/* revisions are coded in BCD, so %x does the job for us */
+	printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
+			SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
+			systab->oem_id, systab->product_id,
+			systab->product_id[0] ? " " : "",
+			SAL_MAJOR(sal_version), SAL_MINOR(sal_version));
+
+	p = (char *) (systab + 1);
+	for (i = 0; i < systab->entry_count; i++) {
+		/*
+		 * The first byte of each entry type contains the type
+		 * descriptor.
+		 */
+		switch (*p) {
+		case SAL_DESC_ENTRY_POINT:
+			sal_desc_entry_point(p);
+			break;
+		case SAL_DESC_PLATFORM_FEATURE:
+			sal_desc_platform_feature(p);
+			break;
+		case SAL_DESC_PTC:
+			ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
+			break;
+		case SAL_DESC_AP_WAKEUP:
+			sal_desc_ap_wakeup(p);
+			break;
+		}
+		p += SAL_DESC_SIZE(*p);
+	}
+
+}
+
+int
+ia64_sal_oemcall(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
+		 u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
+{
+	if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
+		return -1;
+	SAL_CALL(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
+	return 0;
+}
+EXPORT_SYMBOL(ia64_sal_oemcall);
+
+int
+ia64_sal_oemcall_nolock(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
+			u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
+			u64 arg7)
+{
+	if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
+		return -1;
+	SAL_CALL_NOLOCK(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
+			arg7);
+	return 0;
+}
+EXPORT_SYMBOL(ia64_sal_oemcall_nolock);
+
+int
+ia64_sal_oemcall_reentrant(struct ia64_sal_retval *isrvp, u64 oemfunc,
+			   u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5,
+			   u64 arg6, u64 arg7)
+{
+	if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
+		return -1;
+	SAL_CALL_REENTRANT(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
+			   arg7);
+	return 0;
+}
+EXPORT_SYMBOL(ia64_sal_oemcall_reentrant);
+
+long
+ia64_sal_freq_base (unsigned long which, unsigned long *ticks_per_second,
+		    unsigned long *drift_info)
+{
+	struct ia64_sal_retval isrv;
+
+	SAL_CALL(isrv, SAL_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
+	*ticks_per_second = isrv.v0;
+	*drift_info = isrv.v1;
+	return isrv.status;
+}
+EXPORT_SYMBOL_GPL(ia64_sal_freq_base);
diff --git a/arch/ia64/kernel/salinfo.c b/arch/ia64/kernel/salinfo.c
new file mode 100644
index 000000000..03b632c56
--- /dev/null
+++ b/arch/ia64/kernel/salinfo.c
@@ -0,0 +1,646 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * salinfo.c
+ *
+ * Creates entries in /proc/sal for various system features.
+ *
+ * Copyright (c) 2003, 2006 Silicon Graphics, Inc.  All rights reserved.
+ * Copyright (c) 2003 Hewlett-Packard Co
+ *	Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * 10/30/2001	jbarnes@sgi.com		copied much of Stephane's palinfo
+ *					code to create this file
+ * Oct 23 2003	kaos@sgi.com
+ *   Replace IPI with set_cpus_allowed() to read a record from the required cpu.
+ *   Redesign salinfo log processing to separate interrupt and user space
+ *   contexts.
+ *   Cache the record across multi-block reads from user space.
+ *   Support > 64 cpus.
+ *   Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
+ *
+ * Jan 28 2004	kaos@sgi.com
+ *   Periodically check for outstanding MCA or INIT records.
+ *
+ * Dec  5 2004	kaos@sgi.com
+ *   Standardize which records are cleared automatically.
+ *
+ * Aug 18 2005	kaos@sgi.com
+ *   mca.c may not pass a buffer, a NULL buffer just indicates that a new
+ *   record is available in SAL.
+ *   Replace some NR_CPUS by cpus_online, for hotplug cpu.
+ *
+ * Jan  5 2006        kaos@sgi.com
+ *   Handle hotplug cpus coming online.
+ *   Handle hotplug cpus going offline while they still have outstanding records.
+ *   Use the cpu_* macros consistently.
+ *   Replace the counting semaphore with a mutex and a test if the cpumask is non-empty.
+ *   Modify the locking to make the test for "work to do" an atomic operation.
+ */
+
+#include <linux/capability.h>
+#include <linux/cpu.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <linux/smp.h>
+#include <linux/timer.h>
+#include <linux/vmalloc.h>
+#include <linux/semaphore.h>
+
+#include <asm/sal.h>
+#include <linux/uaccess.h>
+
+MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
+MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
+MODULE_LICENSE("GPL");
+
+typedef struct {
+	const char		*name;		/* name of the proc entry */
+	unsigned long           feature;        /* feature bit */
+	struct proc_dir_entry	*entry;		/* registered entry (removal) */
+} salinfo_entry_t;
+
+/*
+ * List {name,feature} pairs for every entry in /proc/sal/<feature>
+ * that this module exports
+ */
+static const salinfo_entry_t salinfo_entries[]={
+	{ "bus_lock",           IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
+	{ "irq_redirection",	IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
+	{ "ipi_redirection",	IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
+	{ "itc_drift",		IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
+};
+
+#define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
+
+static char *salinfo_log_name[] = {
+	"mca",
+	"init",
+	"cmc",
+	"cpe",
+};
+
+static struct proc_dir_entry *salinfo_proc_entries[
+	ARRAY_SIZE(salinfo_entries) +			/* /proc/sal/bus_lock */
+	ARRAY_SIZE(salinfo_log_name) +			/* /proc/sal/{mca,...} */
+	(2 * ARRAY_SIZE(salinfo_log_name)) +		/* /proc/sal/mca/{event,data} */
+	1];						/* /proc/sal */
+
+/* Some records we get ourselves, some are accessed as saved data in buffers
+ * that are owned by mca.c.
+ */
+struct salinfo_data_saved {
+	u8*			buffer;
+	u64			size;
+	u64			id;
+	int			cpu;
+};
+
+/* State transitions.  Actions are :-
+ *   Write "read <cpunum>" to the data file.
+ *   Write "clear <cpunum>" to the data file.
+ *   Write "oemdata <cpunum> <offset> to the data file.
+ *   Read from the data file.
+ *   Close the data file.
+ *
+ * Start state is NO_DATA.
+ *
+ * NO_DATA
+ *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
+ *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
+ *    write "oemdata <cpunum> <offset> -> return -EINVAL.
+ *    read data -> return EOF.
+ *    close -> unchanged.  Free record areas.
+ *
+ * LOG_RECORD
+ *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
+ *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
+ *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
+ *    read data -> return the INIT/MCA/CMC/CPE record.
+ *    close -> unchanged.  Keep record areas.
+ *
+ * OEMDATA
+ *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
+ *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
+ *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
+ *    read data -> return the formatted oemdata.
+ *    close -> unchanged.  Keep record areas.
+ *
+ * Closing the data file does not change the state.  This allows shell scripts
+ * to manipulate salinfo data, each shell redirection opens the file, does one
+ * action then closes it again.  The record areas are only freed at close when
+ * the state is NO_DATA.
+ */
+enum salinfo_state {
+	STATE_NO_DATA,
+	STATE_LOG_RECORD,
+	STATE_OEMDATA,
+};
+
+struct salinfo_data {
+	cpumask_t		cpu_event;	/* which cpus have outstanding events */
+	wait_queue_head_t	read_wait;
+	u8			*log_buffer;
+	u64			log_size;
+	u8			*oemdata;	/* decoded oem data */
+	u64			oemdata_size;
+	int			open;		/* single-open to prevent races */
+	u8			type;
+	u8			saved_num;	/* using a saved record? */
+	enum salinfo_state	state :8;	/* processing state */
+	u8			padding;
+	int			cpu_check;	/* next CPU to check */
+	struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
+};
+
+static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
+
+static DEFINE_SPINLOCK(data_lock);
+static DEFINE_SPINLOCK(data_saved_lock);
+
+/** salinfo_platform_oemdata - optional callback to decode oemdata from an error
+ * record.
+ * @sect_header: pointer to the start of the section to decode.
+ * @oemdata: returns vmalloc area containing the decoded output.
+ * @oemdata_size: returns length of decoded output (strlen).
+ *
+ * Description: If user space asks for oem data to be decoded by the kernel
+ * and/or prom and the platform has set salinfo_platform_oemdata to the address
+ * of a platform specific routine then call that routine.  salinfo_platform_oemdata
+ * vmalloc's and formats its output area, returning the address of the text
+ * and its strlen.  Returns 0 for success, -ve for error.  The callback is
+ * invoked on the cpu that generated the error record.
+ */
+int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
+
+struct salinfo_platform_oemdata_parms {
+	const u8 *efi_guid;
+	u8 **oemdata;
+	u64 *oemdata_size;
+};
+
+static long
+salinfo_platform_oemdata_cpu(void *context)
+{
+	struct salinfo_platform_oemdata_parms *parms = context;
+
+	return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
+}
+
+static void
+shift1_data_saved (struct salinfo_data *data, int shift)
+{
+	memcpy(data->data_saved+shift, data->data_saved+shift+1,
+	       (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
+	memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
+	       sizeof(data->data_saved[0]));
+}
+
+/* This routine is invoked in interrupt context.  Note: mca.c enables
+ * interrupts before calling this code for CMC/CPE.  MCA and INIT events are
+ * not irq safe, do not call any routines that use spinlocks, they may deadlock.
+ * MCA and INIT records are recorded, a timer event will look for any
+ * outstanding events and wake up the user space code.
+ *
+ * The buffer passed from mca.c points to the output from ia64_log_get. This is
+ * a persistent buffer but its contents can change between the interrupt and
+ * when user space processes the record.  Save the record id to identify
+ * changes.  If the buffer is NULL then just update the bitmap.
+ */
+void
+salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
+{
+	struct salinfo_data *data = salinfo_data + type;
+	struct salinfo_data_saved *data_saved;
+	unsigned long flags = 0;
+	int i;
+	int saved_size = ARRAY_SIZE(data->data_saved);
+
+	BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
+
+	if (irqsafe)
+		spin_lock_irqsave(&data_saved_lock, flags);
+	if (buffer) {
+		for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
+			if (!data_saved->buffer)
+				break;
+		}
+		if (i == saved_size) {
+			if (!data->saved_num) {
+				shift1_data_saved(data, 0);
+				data_saved = data->data_saved + saved_size - 1;
+			} else
+				data_saved = NULL;
+		}
+		if (data_saved) {
+			data_saved->cpu = smp_processor_id();
+			data_saved->id = ((sal_log_record_header_t *)buffer)->id;
+			data_saved->size = size;
+			data_saved->buffer = buffer;
+		}
+	}
+	cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
+	if (irqsafe) {
+		wake_up_interruptible(&data->read_wait);
+		spin_unlock_irqrestore(&data_saved_lock, flags);
+	}
+}
+
+/* Check for outstanding MCA/INIT records every minute (arbitrary) */
+#define SALINFO_TIMER_DELAY (60*HZ)
+static struct timer_list salinfo_timer;
+extern void ia64_mlogbuf_dump(void);
+
+static void
+salinfo_timeout_check(struct salinfo_data *data)
+{
+	if (!data->open)
+		return;
+	if (!cpumask_empty(&data->cpu_event))
+		wake_up_interruptible(&data->read_wait);
+}
+
+static void
+salinfo_timeout(struct timer_list *unused)
+{
+	ia64_mlogbuf_dump();
+	salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
+	salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
+	salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
+	add_timer(&salinfo_timer);
+}
+
+static int
+salinfo_event_open(struct inode *inode, struct file *file)
+{
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	return 0;
+}
+
+static ssize_t
+salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
+{
+	struct salinfo_data *data = pde_data(file_inode(file));
+	char cmd[32];
+	size_t size;
+	int i, n, cpu = -1;
+
+retry:
+	if (cpumask_empty(&data->cpu_event)) {
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+		if (wait_event_interruptible(data->read_wait,
+					     !cpumask_empty(&data->cpu_event)))
+			return -EINTR;
+	}
+
+	n = data->cpu_check;
+	for (i = 0; i < nr_cpu_ids; i++) {
+		if (cpumask_test_cpu(n, &data->cpu_event)) {
+			if (!cpu_online(n)) {
+				cpumask_clear_cpu(n, &data->cpu_event);
+				continue;
+			}
+			cpu = n;
+			break;
+		}
+		if (++n == nr_cpu_ids)
+			n = 0;
+	}
+
+	if (cpu == -1)
+		goto retry;
+
+	ia64_mlogbuf_dump();
+
+	/* for next read, start checking at next CPU */
+	data->cpu_check = cpu;
+	if (++data->cpu_check == nr_cpu_ids)
+		data->cpu_check = 0;
+
+	snprintf(cmd, sizeof(cmd), "read %d\n", cpu);
+
+	size = strlen(cmd);
+	if (size > count)
+		size = count;
+	if (copy_to_user(buffer, cmd, size))
+		return -EFAULT;
+
+	return size;
+}
+
+static const struct proc_ops salinfo_event_proc_ops = {
+	.proc_open	= salinfo_event_open,
+	.proc_read	= salinfo_event_read,
+	.proc_lseek	= noop_llseek,
+};
+
+static int
+salinfo_log_open(struct inode *inode, struct file *file)
+{
+	struct salinfo_data *data = pde_data(inode);
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	spin_lock(&data_lock);
+	if (data->open) {
+		spin_unlock(&data_lock);
+		return -EBUSY;
+	}
+	data->open = 1;
+	spin_unlock(&data_lock);
+
+	if (data->state == STATE_NO_DATA &&
+	    !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) {
+		data->open = 0;
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static int
+salinfo_log_release(struct inode *inode, struct file *file)
+{
+	struct salinfo_data *data = pde_data(inode);
+
+	if (data->state == STATE_NO_DATA) {
+		vfree(data->log_buffer);
+		vfree(data->oemdata);
+		data->log_buffer = NULL;
+		data->oemdata = NULL;
+	}
+	spin_lock(&data_lock);
+	data->open = 0;
+	spin_unlock(&data_lock);
+	return 0;
+}
+
+static long
+salinfo_log_read_cpu(void *context)
+{
+	struct salinfo_data *data = context;
+	sal_log_record_header_t *rh;
+	data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer);
+	rh = (sal_log_record_header_t *)(data->log_buffer);
+	/* Clear corrected errors as they are read from SAL */
+	if (rh->severity == sal_log_severity_corrected)
+		ia64_sal_clear_state_info(data->type);
+	return 0;
+}
+
+static void
+salinfo_log_new_read(int cpu, struct salinfo_data *data)
+{
+	struct salinfo_data_saved *data_saved;
+	unsigned long flags;
+	int i;
+	int saved_size = ARRAY_SIZE(data->data_saved);
+
+	data->saved_num = 0;
+	spin_lock_irqsave(&data_saved_lock, flags);
+retry:
+	for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
+		if (data_saved->buffer && data_saved->cpu == cpu) {
+			sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
+			data->log_size = data_saved->size;
+			memcpy(data->log_buffer, rh, data->log_size);
+			barrier();	/* id check must not be moved */
+			if (rh->id == data_saved->id) {
+				data->saved_num = i+1;
+				break;
+			}
+			/* saved record changed by mca.c since interrupt, discard it */
+			shift1_data_saved(data, i);
+			goto retry;
+		}
+	}
+	spin_unlock_irqrestore(&data_saved_lock, flags);
+
+	if (!data->saved_num)
+		work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
+	if (!data->log_size) {
+		data->state = STATE_NO_DATA;
+		cpumask_clear_cpu(cpu, &data->cpu_event);
+	} else {
+		data->state = STATE_LOG_RECORD;
+	}
+}
+
+static ssize_t
+salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
+{
+	struct salinfo_data *data = pde_data(file_inode(file));
+	u8 *buf;
+	u64 bufsize;
+
+	if (data->state == STATE_LOG_RECORD) {
+		buf = data->log_buffer;
+		bufsize = data->log_size;
+	} else if (data->state == STATE_OEMDATA) {
+		buf = data->oemdata;
+		bufsize = data->oemdata_size;
+	} else {
+		buf = NULL;
+		bufsize = 0;
+	}
+	return simple_read_from_buffer(buffer, count, ppos, buf, bufsize);
+}
+
+static long
+salinfo_log_clear_cpu(void *context)
+{
+	struct salinfo_data *data = context;
+
+	ia64_sal_clear_state_info(data->type);
+	return 0;
+}
+
+static int
+salinfo_log_clear(struct salinfo_data *data, int cpu)
+{
+	sal_log_record_header_t *rh;
+	unsigned long flags;
+	spin_lock_irqsave(&data_saved_lock, flags);
+	data->state = STATE_NO_DATA;
+	if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
+		spin_unlock_irqrestore(&data_saved_lock, flags);
+		return 0;
+	}
+	cpumask_clear_cpu(cpu, &data->cpu_event);
+	if (data->saved_num) {
+		shift1_data_saved(data, data->saved_num - 1);
+		data->saved_num = 0;
+	}
+	spin_unlock_irqrestore(&data_saved_lock, flags);
+	rh = (sal_log_record_header_t *)(data->log_buffer);
+	/* Corrected errors have already been cleared from SAL */
+	if (rh->severity != sal_log_severity_corrected)
+		work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
+	/* clearing a record may make a new record visible */
+	salinfo_log_new_read(cpu, data);
+	if (data->state == STATE_LOG_RECORD) {
+		spin_lock_irqsave(&data_saved_lock, flags);
+		cpumask_set_cpu(cpu, &data->cpu_event);
+		wake_up_interruptible(&data->read_wait);
+		spin_unlock_irqrestore(&data_saved_lock, flags);
+	}
+	return 0;
+}
+
+static ssize_t
+salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
+{
+	struct salinfo_data *data = pde_data(file_inode(file));
+	char cmd[32];
+	size_t size;
+	u32 offset;
+	int cpu;
+
+	size = sizeof(cmd);
+	if (count < size)
+		size = count;
+	if (copy_from_user(cmd, buffer, size))
+		return -EFAULT;
+
+	if (sscanf(cmd, "read %d", &cpu) == 1) {
+		salinfo_log_new_read(cpu, data);
+	} else if (sscanf(cmd, "clear %d", &cpu) == 1) {
+		int ret;
+		if ((ret = salinfo_log_clear(data, cpu)))
+			count = ret;
+	} else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) {
+		if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA)
+			return -EINVAL;
+		if (offset > data->log_size - sizeof(efi_guid_t))
+			return -EINVAL;
+		data->state = STATE_OEMDATA;
+		if (salinfo_platform_oemdata) {
+			struct salinfo_platform_oemdata_parms parms = {
+				.efi_guid = data->log_buffer + offset,
+				.oemdata = &data->oemdata,
+				.oemdata_size = &data->oemdata_size
+			};
+			count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
+						 &parms);
+		} else
+			data->oemdata_size = 0;
+	} else
+		return -EINVAL;
+
+	return count;
+}
+
+static const struct proc_ops salinfo_data_proc_ops = {
+	.proc_open	= salinfo_log_open,
+	.proc_release	= salinfo_log_release,
+	.proc_read	= salinfo_log_read,
+	.proc_write	= salinfo_log_write,
+	.proc_lseek	= default_llseek,
+};
+
+static int salinfo_cpu_online(unsigned int cpu)
+{
+	unsigned int i, end = ARRAY_SIZE(salinfo_data);
+	struct salinfo_data *data;
+
+	spin_lock_irq(&data_saved_lock);
+	for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
+		cpumask_set_cpu(cpu, &data->cpu_event);
+		wake_up_interruptible(&data->read_wait);
+	}
+	spin_unlock_irq(&data_saved_lock);
+	return 0;
+}
+
+static int salinfo_cpu_pre_down(unsigned int cpu)
+{
+	unsigned int i, end = ARRAY_SIZE(salinfo_data);
+	struct salinfo_data *data;
+
+	spin_lock_irq(&data_saved_lock);
+	for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
+		struct salinfo_data_saved *data_saved;
+		int j = ARRAY_SIZE(data->data_saved) - 1;
+
+		for (data_saved = data->data_saved + j; j >= 0;
+		     --j, --data_saved) {
+			if (data_saved->buffer && data_saved->cpu == cpu)
+				shift1_data_saved(data, j);
+		}
+		cpumask_clear_cpu(cpu, &data->cpu_event);
+	}
+	spin_unlock_irq(&data_saved_lock);
+	return 0;
+}
+
+/*
+ * 'data' contains an integer that corresponds to the feature we're
+ * testing
+ */
+static int __maybe_unused proc_salinfo_show(struct seq_file *m, void *v)
+{
+	unsigned long data = (unsigned long)v;
+	seq_puts(m, (sal_platform_features & data) ? "1\n" : "0\n");
+	return 0;
+}
+
+static int __init
+salinfo_init(void)
+{
+	struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */
+	struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */
+	struct proc_dir_entry *dir, *entry;
+	struct salinfo_data *data;
+	int i;
+
+	salinfo_dir = proc_mkdir("sal", NULL);
+	if (!salinfo_dir)
+		return 0;
+
+	for (i=0; i < NR_SALINFO_ENTRIES; i++) {
+		/* pass the feature bit in question as misc data */
+		*sdir++ = proc_create_single_data(salinfo_entries[i].name, 0,
+				salinfo_dir, proc_salinfo_show,
+				(void *)salinfo_entries[i].feature);
+	}
+
+	for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
+		data = salinfo_data + i;
+		data->type = i;
+		init_waitqueue_head(&data->read_wait);
+		dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
+		if (!dir)
+			continue;
+
+		entry = proc_create_data("event", S_IRUSR, dir,
+					 &salinfo_event_proc_ops, data);
+		if (!entry)
+			continue;
+		*sdir++ = entry;
+
+		entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir,
+					 &salinfo_data_proc_ops, data);
+		if (!entry)
+			continue;
+		*sdir++ = entry;
+
+		*sdir++ = dir;
+	}
+
+	*sdir++ = salinfo_dir;
+
+	timer_setup(&salinfo_timer, salinfo_timeout, 0);
+	salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
+	add_timer(&salinfo_timer);
+
+	i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online",
+			      salinfo_cpu_online, salinfo_cpu_pre_down);
+	WARN_ON(i < 0);
+	return 0;
+}
+
+module_init(salinfo_init);
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
new file mode 100644
index 000000000..9009f1871
--- /dev/null
+++ b/arch/ia64/kernel/setup.c
@@ -0,0 +1,1081 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Architecture-specific setup.
+ *
+ * Copyright (C) 1998-2001, 2003-2004 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2000, 2004 Intel Corp
+ * 	Rohit Seth <rohit.seth@intel.com>
+ * 	Suresh Siddha <suresh.b.siddha@intel.com>
+ * 	Gordon Jin <gordon.jin@intel.com>
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ *
+ * 12/26/04 S.Siddha, G.Jin, R.Seth
+ *			Add multi-threading and multi-core detection
+ * 11/12/01 D.Mosberger Convert get_cpuinfo() to seq_file based show_cpuinfo().
+ * 04/04/00 D.Mosberger renamed cpu_initialized to cpu_online_map
+ * 03/31/00 R.Seth	cpu_initialized and current->processor fixes
+ * 02/04/00 D.Mosberger	some more get_cpuinfo fixes...
+ * 02/01/00 R.Seth	fixed get_cpuinfo for SMP
+ * 01/07/99 S.Eranian	added the support for command line argument
+ * 06/24/99 W.Drummond	added boot_cpu_data.
+ * 05/28/05 Z. Menyhart	Dynamic stride size for "flush_icache_range()"
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pgtable.h>
+
+#include <linux/acpi.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/cpu.h>
+#include <linux/kdev_t.h>
+#include <linux/kernel.h>
+#include <linux/memblock.h>
+#include <linux/reboot.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/clock.h>
+#include <linux/sched/task_stack.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <linux/threads.h>
+#include <linux/screen_info.h>
+#include <linux/dmi.h>
+#include <linux/root_dev.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/efi.h>
+#include <linux/initrd.h>
+#include <linux/pm.h>
+#include <linux/cpufreq.h>
+#include <linux/kexec.h>
+#include <linux/crash_dump.h>
+
+#include <asm/mca.h>
+#include <asm/meminit.h>
+#include <asm/page.h>
+#include <asm/patch.h>
+#include <asm/processor.h>
+#include <asm/sal.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/smp.h>
+#include <asm/tlbflush.h>
+#include <asm/unistd.h>
+#include <asm/uv/uv.h>
+#include <asm/xtp.h>
+
+#if defined(CONFIG_SMP) && (IA64_CPU_SIZE > PAGE_SIZE)
+# error "struct cpuinfo_ia64 too big!"
+#endif
+
+char ia64_platform_name[64];
+
+#ifdef CONFIG_SMP
+unsigned long __per_cpu_offset[NR_CPUS];
+EXPORT_SYMBOL(__per_cpu_offset);
+#endif
+
+DEFINE_PER_CPU(struct cpuinfo_ia64, ia64_cpu_info);
+EXPORT_SYMBOL(ia64_cpu_info);
+DEFINE_PER_CPU(unsigned long, local_per_cpu_offset);
+#ifdef CONFIG_SMP
+EXPORT_SYMBOL(local_per_cpu_offset);
+#endif
+unsigned long ia64_cycles_per_usec;
+struct ia64_boot_param *ia64_boot_param;
+struct screen_info screen_info;
+unsigned long vga_console_iobase;
+unsigned long vga_console_membase;
+
+static struct resource data_resource = {
+	.name	= "Kernel data",
+	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
+};
+
+static struct resource code_resource = {
+	.name	= "Kernel code",
+	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
+};
+
+static struct resource bss_resource = {
+	.name	= "Kernel bss",
+	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
+};
+
+unsigned long ia64_max_cacheline_size;
+
+unsigned long ia64_iobase;	/* virtual address for I/O accesses */
+EXPORT_SYMBOL(ia64_iobase);
+struct io_space io_space[MAX_IO_SPACES];
+EXPORT_SYMBOL(io_space);
+unsigned int num_io_spaces;
+
+/*
+ * "flush_icache_range()" needs to know what processor dependent stride size to use
+ * when it makes i-cache(s) coherent with d-caches.
+ */
+#define	I_CACHE_STRIDE_SHIFT	5	/* Safest way to go: 32 bytes by 32 bytes */
+unsigned long ia64_i_cache_stride_shift = ~0;
+/*
+ * "clflush_cache_range()" needs to know what processor dependent stride size to
+ * use when it flushes cache lines including both d-cache and i-cache.
+ */
+/* Safest way to go: 32 bytes by 32 bytes */
+#define	CACHE_STRIDE_SHIFT	5
+unsigned long ia64_cache_stride_shift = ~0;
+
+/*
+ * We use a special marker for the end of memory and it uses the extra (+1) slot
+ */
+struct rsvd_region rsvd_region[IA64_MAX_RSVD_REGIONS + 1] __initdata;
+static int num_rsvd_regions __initdata;
+
+
+/*
+ * Filter incoming memory segments based on the primitive map created from the boot
+ * parameters. Segments contained in the map are removed from the memory ranges. A
+ * caller-specified function is called with the memory ranges that remain after filtering.
+ * This routine does not assume the incoming segments are sorted.
+ */
+int __init
+filter_rsvd_memory (u64 start, u64 end, void *arg)
+{
+	u64 range_start, range_end, prev_start;
+	void (*func)(unsigned long, unsigned long, int);
+	int i;
+
+#if IGNORE_PFN0
+	if (start == PAGE_OFFSET) {
+		printk(KERN_WARNING "warning: skipping physical page 0\n");
+		start += PAGE_SIZE;
+		if (start >= end) return 0;
+	}
+#endif
+	/*
+	 * lowest possible address(walker uses virtual)
+	 */
+	prev_start = PAGE_OFFSET;
+	func = arg;
+
+	for (i = 0; i < num_rsvd_regions; ++i) {
+		range_start = max(start, prev_start);
+		range_end   = min(end, rsvd_region[i].start);
+
+		if (range_start < range_end)
+			call_pernode_memory(__pa(range_start), range_end - range_start, func);
+
+		/* nothing more available in this segment */
+		if (range_end == end) return 0;
+
+		prev_start = rsvd_region[i].end;
+	}
+	/* end of memory marker allows full processing inside loop body */
+	return 0;
+}
+
+/*
+ * Similar to "filter_rsvd_memory()", but the reserved memory ranges
+ * are not filtered out.
+ */
+int __init
+filter_memory(u64 start, u64 end, void *arg)
+{
+	void (*func)(unsigned long, unsigned long, int);
+
+#if IGNORE_PFN0
+	if (start == PAGE_OFFSET) {
+		printk(KERN_WARNING "warning: skipping physical page 0\n");
+		start += PAGE_SIZE;
+		if (start >= end)
+			return 0;
+	}
+#endif
+	func = arg;
+	if (start < end)
+		call_pernode_memory(__pa(start), end - start, func);
+	return 0;
+}
+
+static void __init
+sort_regions (struct rsvd_region *rsvd_region, int max)
+{
+	int j;
+
+	/* simple bubble sorting */
+	while (max--) {
+		for (j = 0; j < max; ++j) {
+			if (rsvd_region[j].start > rsvd_region[j+1].start) {
+				swap(rsvd_region[j], rsvd_region[j + 1]);
+			}
+		}
+	}
+}
+
+/* merge overlaps */
+static int __init
+merge_regions (struct rsvd_region *rsvd_region, int max)
+{
+	int i;
+	for (i = 1; i < max; ++i) {
+		if (rsvd_region[i].start >= rsvd_region[i-1].end)
+			continue;
+		if (rsvd_region[i].end > rsvd_region[i-1].end)
+			rsvd_region[i-1].end = rsvd_region[i].end;
+		--max;
+		memmove(&rsvd_region[i], &rsvd_region[i+1],
+			(max - i) * sizeof(struct rsvd_region));
+	}
+	return max;
+}
+
+/*
+ * Request address space for all standard resources
+ */
+static int __init register_memory(void)
+{
+	code_resource.start = ia64_tpa(_text);
+	code_resource.end   = ia64_tpa(_etext) - 1;
+	data_resource.start = ia64_tpa(_etext);
+	data_resource.end   = ia64_tpa(_edata) - 1;
+	bss_resource.start  = ia64_tpa(__bss_start);
+	bss_resource.end    = ia64_tpa(_end) - 1;
+	efi_initialize_iomem_resources(&code_resource, &data_resource,
+			&bss_resource);
+
+	return 0;
+}
+
+__initcall(register_memory);
+
+
+#ifdef CONFIG_KEXEC
+
+/*
+ * This function checks if the reserved crashkernel is allowed on the specific
+ * IA64 machine flavour. Machines without an IO TLB use swiotlb and require
+ * some memory below 4 GB (i.e. in 32 bit area), see the implementation of
+ * kernel/dma/swiotlb.c. The hpzx1 architecture has an IO TLB but cannot use that
+ * in kdump case. See the comment in sba_init() in sba_iommu.c.
+ *
+ * So, the only machvec that really supports loading the kdump kernel
+ * over 4 GB is "uv".
+ */
+static int __init check_crashkernel_memory(unsigned long pbase, size_t size)
+{
+	if (is_uv_system())
+		return 1;
+	else
+		return pbase < (1UL << 32);
+}
+
+static void __init setup_crashkernel(unsigned long total, int *n)
+{
+	unsigned long long base = 0, size = 0;
+	int ret;
+
+	ret = parse_crashkernel(boot_command_line, total,
+			&size, &base);
+	if (ret == 0 && size > 0) {
+		if (!base) {
+			sort_regions(rsvd_region, *n);
+			*n = merge_regions(rsvd_region, *n);
+			base = kdump_find_rsvd_region(size,
+					rsvd_region, *n);
+		}
+
+		if (!check_crashkernel_memory(base, size)) {
+			pr_warn("crashkernel: There would be kdump memory "
+				"at %ld GB but this is unusable because it "
+				"must\nbe below 4 GB. Change the memory "
+				"configuration of the machine.\n",
+				(unsigned long)(base >> 30));
+			return;
+		}
+
+		if (base != ~0UL) {
+			printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+					"for crashkernel (System RAM: %ldMB)\n",
+					(unsigned long)(size >> 20),
+					(unsigned long)(base >> 20),
+					(unsigned long)(total >> 20));
+			rsvd_region[*n].start =
+				(unsigned long)__va(base);
+			rsvd_region[*n].end =
+				(unsigned long)__va(base + size);
+			(*n)++;
+			crashk_res.start = base;
+			crashk_res.end = base + size - 1;
+		}
+	}
+	efi_memmap_res.start = ia64_boot_param->efi_memmap;
+	efi_memmap_res.end = efi_memmap_res.start +
+		ia64_boot_param->efi_memmap_size;
+	boot_param_res.start = __pa(ia64_boot_param);
+	boot_param_res.end = boot_param_res.start +
+		sizeof(*ia64_boot_param);
+}
+#else
+static inline void __init setup_crashkernel(unsigned long total, int *n)
+{}
+#endif
+
+#ifdef CONFIG_CRASH_DUMP
+static int __init reserve_elfcorehdr(u64 *start, u64 *end)
+{
+	u64 length;
+
+	/* We get the address using the kernel command line,
+	 * but the size is extracted from the EFI tables.
+	 * Both address and size are required for reservation
+	 * to work properly.
+	 */
+
+	if (!is_vmcore_usable())
+		return -EINVAL;
+
+	if ((length = vmcore_find_descriptor_size(elfcorehdr_addr)) == 0) {
+		vmcore_unusable();
+		return -EINVAL;
+	}
+
+	*start = (unsigned long)__va(elfcorehdr_addr);
+	*end = *start + length;
+	return 0;
+}
+#endif /* CONFIG_CRASH_DUMP */
+
+/**
+ * reserve_memory - setup reserved memory areas
+ *
+ * Setup the reserved memory areas set aside for the boot parameters,
+ * initrd, etc.  There are currently %IA64_MAX_RSVD_REGIONS defined,
+ * see arch/ia64/include/asm/meminit.h if you need to define more.
+ */
+void __init
+reserve_memory (void)
+{
+	int n = 0;
+	unsigned long total_memory;
+
+	/*
+	 * none of the entries in this table overlap
+	 */
+	rsvd_region[n].start = (unsigned long) ia64_boot_param;
+	rsvd_region[n].end   = rsvd_region[n].start + sizeof(*ia64_boot_param);
+	n++;
+
+	rsvd_region[n].start = (unsigned long) __va(ia64_boot_param->efi_memmap);
+	rsvd_region[n].end   = rsvd_region[n].start + ia64_boot_param->efi_memmap_size;
+	n++;
+
+	rsvd_region[n].start = (unsigned long) __va(ia64_boot_param->command_line);
+	rsvd_region[n].end   = (rsvd_region[n].start
+				+ strlen(__va(ia64_boot_param->command_line)) + 1);
+	n++;
+
+	rsvd_region[n].start = (unsigned long) ia64_imva((void *)KERNEL_START);
+	rsvd_region[n].end   = (unsigned long) ia64_imva(_end);
+	n++;
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (ia64_boot_param->initrd_start) {
+		rsvd_region[n].start = (unsigned long)__va(ia64_boot_param->initrd_start);
+		rsvd_region[n].end   = rsvd_region[n].start + ia64_boot_param->initrd_size;
+		n++;
+	}
+#endif
+
+#ifdef CONFIG_CRASH_DUMP
+	if (reserve_elfcorehdr(&rsvd_region[n].start,
+			       &rsvd_region[n].end) == 0)
+		n++;
+#endif
+
+	total_memory = efi_memmap_init(&rsvd_region[n].start, &rsvd_region[n].end);
+	n++;
+
+	setup_crashkernel(total_memory, &n);
+
+	/* end of memory marker */
+	rsvd_region[n].start = ~0UL;
+	rsvd_region[n].end   = ~0UL;
+	n++;
+
+	num_rsvd_regions = n;
+	BUG_ON(IA64_MAX_RSVD_REGIONS + 1 < n);
+
+	sort_regions(rsvd_region, num_rsvd_regions);
+	num_rsvd_regions = merge_regions(rsvd_region, num_rsvd_regions);
+
+	/* reserve all regions except the end of memory marker with memblock */
+	for (n = 0; n < num_rsvd_regions - 1; n++) {
+		struct rsvd_region *region = &rsvd_region[n];
+		phys_addr_t addr = __pa(region->start);
+		phys_addr_t size = region->end - region->start;
+
+		memblock_reserve(addr, size);
+	}
+}
+
+/**
+ * find_initrd - get initrd parameters from the boot parameter structure
+ *
+ * Grab the initrd start and end from the boot parameter struct given us by
+ * the boot loader.
+ */
+void __init
+find_initrd (void)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (ia64_boot_param->initrd_start) {
+		initrd_start = (unsigned long)__va(ia64_boot_param->initrd_start);
+		initrd_end   = initrd_start+ia64_boot_param->initrd_size;
+
+		printk(KERN_INFO "Initial ramdisk at: 0x%lx (%llu bytes)\n",
+		       initrd_start, ia64_boot_param->initrd_size);
+	}
+#endif
+}
+
+static void __init
+io_port_init (void)
+{
+	unsigned long phys_iobase;
+
+	/*
+	 * Set `iobase' based on the EFI memory map or, failing that, the
+	 * value firmware left in ar.k0.
+	 *
+	 * Note that in ia32 mode, IN/OUT instructions use ar.k0 to compute
+	 * the port's virtual address, so ia32_load_state() loads it with a
+	 * user virtual address.  But in ia64 mode, glibc uses the
+	 * *physical* address in ar.k0 to mmap the appropriate area from
+	 * /dev/mem, and the inX()/outX() interfaces use MMIO.  In both
+	 * cases, user-mode can only use the legacy 0-64K I/O port space.
+	 *
+	 * ar.k0 is not involved in kernel I/O port accesses, which can use
+	 * any of the I/O port spaces and are done via MMIO using the
+	 * virtual mmio_base from the appropriate io_space[].
+	 */
+	phys_iobase = efi_get_iobase();
+	if (!phys_iobase) {
+		phys_iobase = ia64_get_kr(IA64_KR_IO_BASE);
+		printk(KERN_INFO "No I/O port range found in EFI memory map, "
+			"falling back to AR.KR0 (0x%lx)\n", phys_iobase);
+	}
+	ia64_iobase = (unsigned long) ioremap(phys_iobase, 0);
+	ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase));
+
+	/* setup legacy IO port space */
+	io_space[0].mmio_base = ia64_iobase;
+	io_space[0].sparse = 1;
+	num_io_spaces = 1;
+}
+
+/**
+ * early_console_setup - setup debugging console
+ *
+ * Consoles started here require little enough setup that we can start using
+ * them very early in the boot process, either right after the machine
+ * vector initialization, or even before if the drivers can detect their hw.
+ *
+ * Returns non-zero if a console couldn't be setup.
+ */
+static inline int __init
+early_console_setup (char *cmdline)
+{
+#ifdef CONFIG_EFI_PCDP
+	if (!efi_setup_pcdp_console(cmdline))
+		return 0;
+#endif
+	return -1;
+}
+
+static void __init
+screen_info_setup(void)
+{
+	unsigned int orig_x, orig_y, num_cols, num_rows, font_height;
+
+	memset(&screen_info, 0, sizeof(screen_info));
+
+	if (!ia64_boot_param->console_info.num_rows ||
+	    !ia64_boot_param->console_info.num_cols) {
+		printk(KERN_WARNING "invalid screen-info, guessing 80x25\n");
+		orig_x = 0;
+		orig_y = 0;
+		num_cols = 80;
+		num_rows = 25;
+		font_height = 16;
+	} else {
+		orig_x = ia64_boot_param->console_info.orig_x;
+		orig_y = ia64_boot_param->console_info.orig_y;
+		num_cols = ia64_boot_param->console_info.num_cols;
+		num_rows = ia64_boot_param->console_info.num_rows;
+		font_height = 400 / num_rows;
+	}
+
+	screen_info.orig_x = orig_x;
+	screen_info.orig_y = orig_y;
+	screen_info.orig_video_cols  = num_cols;
+	screen_info.orig_video_lines = num_rows;
+	screen_info.orig_video_points = font_height;
+	screen_info.orig_video_mode = 3;	/* XXX fake */
+	screen_info.orig_video_isVGA = 1;	/* XXX fake */
+	screen_info.orig_video_ega_bx = 3;	/* XXX fake */
+}
+
+static inline void
+mark_bsp_online (void)
+{
+#ifdef CONFIG_SMP
+	/* If we register an early console, allow CPU 0 to printk */
+	set_cpu_online(smp_processor_id(), true);
+#endif
+}
+
+static __initdata int nomca;
+static __init int setup_nomca(char *s)
+{
+	nomca = 1;
+	return 0;
+}
+early_param("nomca", setup_nomca);
+
+void __init
+setup_arch (char **cmdline_p)
+{
+	unw_init();
+
+	ia64_patch_vtop((u64) __start___vtop_patchlist, (u64) __end___vtop_patchlist);
+
+	*cmdline_p = __va(ia64_boot_param->command_line);
+	strscpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
+
+	efi_init();
+	io_port_init();
+
+	uv_probe_system_type();
+	parse_early_param();
+
+	if (early_console_setup(*cmdline_p) == 0)
+		mark_bsp_online();
+
+	/* Initialize the ACPI boot-time table parser */
+	acpi_table_init();
+	early_acpi_boot_init();
+#ifdef CONFIG_ACPI_NUMA
+	acpi_numa_init();
+	acpi_numa_fixup();
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+	prefill_possible_map();
+#endif
+	per_cpu_scan_finalize((cpumask_empty(&early_cpu_possible_map) ?
+		32 : cpumask_weight(&early_cpu_possible_map)),
+		additional_cpus > 0 ? additional_cpus : 0);
+#endif /* CONFIG_ACPI_NUMA */
+
+#ifdef CONFIG_SMP
+	smp_build_cpu_map();
+#endif
+	find_memory();
+
+	/* process SAL system table: */
+	ia64_sal_init(__va(sal_systab_phys));
+
+#ifdef CONFIG_ITANIUM
+	ia64_patch_rse((u64) __start___rse_patchlist, (u64) __end___rse_patchlist);
+#else
+	{
+		unsigned long num_phys_stacked;
+
+		if (ia64_pal_rse_info(&num_phys_stacked, 0) == 0 && num_phys_stacked > 96)
+			ia64_patch_rse((u64) __start___rse_patchlist, (u64) __end___rse_patchlist);
+	}
+#endif
+
+#ifdef CONFIG_SMP
+	cpu_physical_id(0) = hard_smp_processor_id();
+#endif
+
+	cpu_init();	/* initialize the bootstrap CPU */
+	mmu_context_init();	/* initialize context_id bitmap */
+
+#ifdef CONFIG_VT
+	if (!conswitchp) {
+# if defined(CONFIG_VGA_CONSOLE)
+		/*
+		 * Non-legacy systems may route legacy VGA MMIO range to system
+		 * memory.  vga_con probes the MMIO hole, so memory looks like
+		 * a VGA device to it.  The EFI memory map can tell us if it's
+		 * memory so we can avoid this problem.
+		 */
+		if (efi_mem_type(0xA0000) != EFI_CONVENTIONAL_MEMORY)
+			conswitchp = &vga_con;
+# endif
+	}
+#endif
+
+	/* enable IA-64 Machine Check Abort Handling unless disabled */
+	if (!nomca)
+		ia64_mca_init();
+
+	/*
+	 * Default to /dev/sda2.  This assumes that the EFI partition
+	 * is physical disk 1 partition 1 and the Linux root disk is
+	 * physical disk 1 partition 2.
+	 */
+	ROOT_DEV = Root_SDA2;		/* default to second partition on first drive */
+
+	if (is_uv_system())
+		uv_setup(cmdline_p);
+#ifdef CONFIG_SMP
+	else
+		init_smp_config();
+#endif
+
+	screen_info_setup();
+	paging_init();
+
+	clear_sched_clock_stable();
+}
+
+/*
+ * Display cpu info for all CPUs.
+ */
+static int
+show_cpuinfo (struct seq_file *m, void *v)
+{
+#ifdef CONFIG_SMP
+#	define lpj	c->loops_per_jiffy
+#	define cpunum	c->cpu
+#else
+#	define lpj	loops_per_jiffy
+#	define cpunum	0
+#endif
+	static struct {
+		unsigned long mask;
+		const char *feature_name;
+	} feature_bits[] = {
+		{ 1UL << 0, "branchlong" },
+		{ 1UL << 1, "spontaneous deferral"},
+		{ 1UL << 2, "16-byte atomic ops" }
+	};
+	char features[128], *cp, *sep;
+	struct cpuinfo_ia64 *c = v;
+	unsigned long mask;
+	unsigned long proc_freq;
+	int i, size;
+
+	mask = c->features;
+
+	/* build the feature string: */
+	memcpy(features, "standard", 9);
+	cp = features;
+	size = sizeof(features);
+	sep = "";
+	for (i = 0; i < ARRAY_SIZE(feature_bits) && size > 1; ++i) {
+		if (mask & feature_bits[i].mask) {
+			cp += snprintf(cp, size, "%s%s", sep,
+				       feature_bits[i].feature_name),
+			sep = ", ";
+			mask &= ~feature_bits[i].mask;
+			size = sizeof(features) - (cp - features);
+		}
+	}
+	if (mask && size > 1) {
+		/* print unknown features as a hex value */
+		snprintf(cp, size, "%s0x%lx", sep, mask);
+	}
+
+	proc_freq = cpufreq_quick_get(cpunum);
+	if (!proc_freq)
+		proc_freq = c->proc_freq / 1000;
+
+	seq_printf(m,
+		   "processor  : %d\n"
+		   "vendor     : %s\n"
+		   "arch       : IA-64\n"
+		   "family     : %u\n"
+		   "model      : %u\n"
+		   "model name : %s\n"
+		   "revision   : %u\n"
+		   "archrev    : %u\n"
+		   "features   : %s\n"
+		   "cpu number : %lu\n"
+		   "cpu regs   : %u\n"
+		   "cpu MHz    : %lu.%03lu\n"
+		   "itc MHz    : %lu.%06lu\n"
+		   "BogoMIPS   : %lu.%02lu\n",
+		   cpunum, c->vendor, c->family, c->model,
+		   c->model_name, c->revision, c->archrev,
+		   features, c->ppn, c->number,
+		   proc_freq / 1000, proc_freq % 1000,
+		   c->itc_freq / 1000000, c->itc_freq % 1000000,
+		   lpj*HZ/500000, (lpj*HZ/5000) % 100);
+#ifdef CONFIG_SMP
+	seq_printf(m, "siblings   : %u\n",
+		   cpumask_weight(&cpu_core_map[cpunum]));
+	if (c->socket_id != -1)
+		seq_printf(m, "physical id: %u\n", c->socket_id);
+	if (c->threads_per_core > 1 || c->cores_per_socket > 1)
+		seq_printf(m,
+			   "core id    : %u\n"
+			   "thread id  : %u\n",
+			   c->core_id, c->thread_id);
+#endif
+	seq_printf(m,"\n");
+
+	return 0;
+}
+
+static void *
+c_start (struct seq_file *m, loff_t *pos)
+{
+#ifdef CONFIG_SMP
+	while (*pos < nr_cpu_ids && !cpu_online(*pos))
+		++*pos;
+#endif
+	return *pos < nr_cpu_ids ? cpu_data(*pos) : NULL;
+}
+
+static void *
+c_next (struct seq_file *m, void *v, loff_t *pos)
+{
+	++*pos;
+	return c_start(m, pos);
+}
+
+static void
+c_stop (struct seq_file *m, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op = {
+	.start =	c_start,
+	.next =		c_next,
+	.stop =		c_stop,
+	.show =		show_cpuinfo
+};
+
+#define MAX_BRANDS	8
+static char brandname[MAX_BRANDS][128];
+
+static char *
+get_model_name(__u8 family, __u8 model)
+{
+	static int overflow;
+	char brand[128];
+	int i;
+
+	memcpy(brand, "Unknown", 8);
+	if (ia64_pal_get_brand_info(brand)) {
+		if (family == 0x7)
+			memcpy(brand, "Merced", 7);
+		else if (family == 0x1f) switch (model) {
+			case 0: memcpy(brand, "McKinley", 9); break;
+			case 1: memcpy(brand, "Madison", 8); break;
+			case 2: memcpy(brand, "Madison up to 9M cache", 23); break;
+		}
+	}
+	for (i = 0; i < MAX_BRANDS; i++)
+		if (strcmp(brandname[i], brand) == 0)
+			return brandname[i];
+	for (i = 0; i < MAX_BRANDS; i++)
+		if (brandname[i][0] == '\0')
+			return strcpy(brandname[i], brand);
+	if (overflow++ == 0)
+		printk(KERN_ERR
+		       "%s: Table overflow. Some processor model information will be missing\n",
+		       __func__);
+	return "Unknown";
+}
+
+static void
+identify_cpu (struct cpuinfo_ia64 *c)
+{
+	union {
+		unsigned long bits[5];
+		struct {
+			/* id 0 & 1: */
+			char vendor[16];
+
+			/* id 2 */
+			u64 ppn;		/* processor serial number */
+
+			/* id 3: */
+			unsigned number		:  8;
+			unsigned revision	:  8;
+			unsigned model		:  8;
+			unsigned family		:  8;
+			unsigned archrev	:  8;
+			unsigned reserved	: 24;
+
+			/* id 4: */
+			u64 features;
+		} field;
+	} cpuid;
+	pal_vm_info_1_u_t vm1;
+	pal_vm_info_2_u_t vm2;
+	pal_status_t status;
+	unsigned long impl_va_msb = 50, phys_addr_size = 44;	/* Itanium defaults */
+	int i;
+	for (i = 0; i < 5; ++i)
+		cpuid.bits[i] = ia64_get_cpuid(i);
+
+	memcpy(c->vendor, cpuid.field.vendor, 16);
+#ifdef CONFIG_SMP
+	c->cpu = smp_processor_id();
+
+	/* below default values will be overwritten  by identify_siblings() 
+	 * for Multi-Threading/Multi-Core capable CPUs
+	 */
+	c->threads_per_core = c->cores_per_socket = c->num_log = 1;
+	c->socket_id = -1;
+
+	identify_siblings(c);
+
+	if (c->threads_per_core > smp_num_siblings)
+		smp_num_siblings = c->threads_per_core;
+#endif
+	c->ppn = cpuid.field.ppn;
+	c->number = cpuid.field.number;
+	c->revision = cpuid.field.revision;
+	c->model = cpuid.field.model;
+	c->family = cpuid.field.family;
+	c->archrev = cpuid.field.archrev;
+	c->features = cpuid.field.features;
+	c->model_name = get_model_name(c->family, c->model);
+
+	status = ia64_pal_vm_summary(&vm1, &vm2);
+	if (status == PAL_STATUS_SUCCESS) {
+		impl_va_msb = vm2.pal_vm_info_2_s.impl_va_msb;
+		phys_addr_size = vm1.pal_vm_info_1_s.phys_add_size;
+	}
+	c->unimpl_va_mask = ~((7L<<61) | ((1L << (impl_va_msb + 1)) - 1));
+	c->unimpl_pa_mask = ~((1L<<63) | ((1L << phys_addr_size) - 1));
+}
+
+/*
+ * Do the following calculations:
+ *
+ * 1. the max. cache line size.
+ * 2. the minimum of the i-cache stride sizes for "flush_icache_range()".
+ * 3. the minimum of the cache stride sizes for "clflush_cache_range()".
+ */
+static void
+get_cache_info(void)
+{
+	unsigned long line_size, max = 1;
+	unsigned long l, levels, unique_caches;
+	pal_cache_config_info_t cci;
+	long status;
+
+        status = ia64_pal_cache_summary(&levels, &unique_caches);
+        if (status != 0) {
+                printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n",
+                       __func__, status);
+                max = SMP_CACHE_BYTES;
+		/* Safest setup for "flush_icache_range()" */
+		ia64_i_cache_stride_shift = I_CACHE_STRIDE_SHIFT;
+		/* Safest setup for "clflush_cache_range()" */
+		ia64_cache_stride_shift = CACHE_STRIDE_SHIFT;
+		goto out;
+        }
+
+	for (l = 0; l < levels; ++l) {
+		/* cache_type (data_or_unified)=2 */
+		status = ia64_pal_cache_config_info(l, 2, &cci);
+		if (status != 0) {
+			printk(KERN_ERR "%s: ia64_pal_cache_config_info"
+				"(l=%lu, 2) failed (status=%ld)\n",
+				__func__, l, status);
+			max = SMP_CACHE_BYTES;
+			/* The safest setup for "flush_icache_range()" */
+			cci.pcci_stride = I_CACHE_STRIDE_SHIFT;
+			/* The safest setup for "clflush_cache_range()" */
+			ia64_cache_stride_shift = CACHE_STRIDE_SHIFT;
+			cci.pcci_unified = 1;
+		} else {
+			if (cci.pcci_stride < ia64_cache_stride_shift)
+				ia64_cache_stride_shift = cci.pcci_stride;
+
+			line_size = 1 << cci.pcci_line_size;
+			if (line_size > max)
+				max = line_size;
+		}
+
+		if (!cci.pcci_unified) {
+			/* cache_type (instruction)=1*/
+			status = ia64_pal_cache_config_info(l, 1, &cci);
+			if (status != 0) {
+				printk(KERN_ERR "%s: ia64_pal_cache_config_info"
+					"(l=%lu, 1) failed (status=%ld)\n",
+					__func__, l, status);
+				/* The safest setup for flush_icache_range() */
+				cci.pcci_stride = I_CACHE_STRIDE_SHIFT;
+			}
+		}
+		if (cci.pcci_stride < ia64_i_cache_stride_shift)
+			ia64_i_cache_stride_shift = cci.pcci_stride;
+	}
+  out:
+	if (max > ia64_max_cacheline_size)
+		ia64_max_cacheline_size = max;
+}
+
+/*
+ * cpu_init() initializes state that is per-CPU.  This function acts
+ * as a 'CPU state barrier', nothing should get across.
+ */
+void
+cpu_init (void)
+{
+	extern void ia64_mmu_init(void *);
+	static unsigned long max_num_phys_stacked = IA64_NUM_PHYS_STACK_REG;
+	unsigned long num_phys_stacked;
+	pal_vm_info_2_u_t vmi;
+	unsigned int max_ctx;
+	struct cpuinfo_ia64 *cpu_info;
+	void *cpu_data;
+
+	cpu_data = per_cpu_init();
+#ifdef CONFIG_SMP
+	/*
+	 * insert boot cpu into sibling and core mapes
+	 * (must be done after per_cpu area is setup)
+	 */
+	if (smp_processor_id() == 0) {
+		cpumask_set_cpu(0, &per_cpu(cpu_sibling_map, 0));
+		cpumask_set_cpu(0, &cpu_core_map[0]);
+	} else {
+		/*
+		 * Set ar.k3 so that assembly code in MCA handler can compute
+		 * physical addresses of per cpu variables with a simple:
+		 *   phys = ar.k3 + &per_cpu_var
+		 * and the alt-dtlb-miss handler can set per-cpu mapping into
+		 * the TLB when needed. head.S already did this for cpu0.
+		 */
+		ia64_set_kr(IA64_KR_PER_CPU_DATA,
+			    ia64_tpa(cpu_data) - (long) __per_cpu_start);
+	}
+#endif
+
+	get_cache_info();
+
+	/*
+	 * We can't pass "local_cpu_data" to identify_cpu() because we haven't called
+	 * ia64_mmu_init() yet.  And we can't call ia64_mmu_init() first because it
+	 * depends on the data returned by identify_cpu().  We break the dependency by
+	 * accessing cpu_data() through the canonical per-CPU address.
+	 */
+	cpu_info = cpu_data + ((char *) &__ia64_per_cpu_var(ia64_cpu_info) - __per_cpu_start);
+	identify_cpu(cpu_info);
+
+#ifdef CONFIG_MCKINLEY
+	{
+#		define FEATURE_SET 16
+		struct ia64_pal_retval iprv;
+
+		if (cpu_info->family == 0x1f) {
+			PAL_CALL_PHYS(iprv, PAL_PROC_GET_FEATURES, 0, FEATURE_SET, 0);
+			if ((iprv.status == 0) && (iprv.v0 & 0x80) && (iprv.v2 & 0x80))
+				PAL_CALL_PHYS(iprv, PAL_PROC_SET_FEATURES,
+				              (iprv.v1 | 0x80), FEATURE_SET, 0);
+		}
+	}
+#endif
+
+	/* Clear the stack memory reserved for pt_regs: */
+	memset(task_pt_regs(current), 0, sizeof(struct pt_regs));
+
+	ia64_set_kr(IA64_KR_FPU_OWNER, 0);
+
+	/*
+	 * Initialize the page-table base register to a global
+	 * directory with all zeroes.  This ensure that we can handle
+	 * TLB-misses to user address-space even before we created the
+	 * first user address-space.  This may happen, e.g., due to
+	 * aggressive use of lfetch.fault.
+	 */
+	ia64_set_kr(IA64_KR_PT_BASE, __pa(ia64_imva(empty_zero_page)));
+
+	/*
+	 * Initialize default control register to defer speculative faults except
+	 * for those arising from TLB misses, which are not deferred.  The
+	 * kernel MUST NOT depend on a particular setting of these bits (in other words,
+	 * the kernel must have recovery code for all speculative accesses).  Turn on
+	 * dcr.lc as per recommendation by the architecture team.  Most IA-32 apps
+	 * shouldn't be affected by this (moral: keep your ia32 locks aligned and you'll
+	 * be fine).
+	 */
+	ia64_setreg(_IA64_REG_CR_DCR,  (  IA64_DCR_DP | IA64_DCR_DK | IA64_DCR_DX | IA64_DCR_DR
+					| IA64_DCR_DA | IA64_DCR_DD | IA64_DCR_LC));
+	mmgrab(&init_mm);
+	current->active_mm = &init_mm;
+	BUG_ON(current->mm);
+
+	ia64_mmu_init(ia64_imva(cpu_data));
+	ia64_mca_cpu_init(ia64_imva(cpu_data));
+
+	/* Clear ITC to eliminate sched_clock() overflows in human time.  */
+	ia64_set_itc(0);
+
+	/* disable all local interrupt sources: */
+	ia64_set_itv(1 << 16);
+	ia64_set_lrr0(1 << 16);
+	ia64_set_lrr1(1 << 16);
+	ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
+	ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
+
+	/* clear TPR & XTP to enable all interrupt classes: */
+	ia64_setreg(_IA64_REG_CR_TPR, 0);
+
+	/* Clear any pending interrupts left by SAL/EFI */
+	while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
+		ia64_eoi();
+
+#ifdef CONFIG_SMP
+	normal_xtp();
+#endif
+
+	/* set ia64_ctx.max_rid to the maximum RID that is supported by all CPUs: */
+	if (ia64_pal_vm_summary(NULL, &vmi) == 0) {
+		max_ctx = (1U << (vmi.pal_vm_info_2_s.rid_size - 3)) - 1;
+		setup_ptcg_sem(vmi.pal_vm_info_2_s.max_purges, NPTCG_FROM_PAL);
+	} else {
+		printk(KERN_WARNING "cpu_init: PAL VM summary failed, assuming 18 RID bits\n");
+		max_ctx = (1U << 15) - 1;	/* use architected minimum */
+	}
+	while (max_ctx < ia64_ctx.max_ctx) {
+		unsigned int old = ia64_ctx.max_ctx;
+		if (cmpxchg(&ia64_ctx.max_ctx, old, max_ctx) == old)
+			break;
+	}
+
+	if (ia64_pal_rse_info(&num_phys_stacked, NULL) != 0) {
+		printk(KERN_WARNING "cpu_init: PAL RSE info failed; assuming 96 physical "
+		       "stacked regs\n");
+		num_phys_stacked = 96;
+	}
+	/* size of physical stacked register partition plus 8 bytes: */
+	if (num_phys_stacked > max_num_phys_stacked) {
+		ia64_patch_phys_stack_reg(num_phys_stacked*8 + 8);
+		max_num_phys_stacked = num_phys_stacked;
+	}
+}
+
+void __init arch_cpu_finalize_init(void)
+{
+	ia64_patch_mckinley_e9((unsigned long) __start___mckinley_e9_bundles,
+			       (unsigned long) __end___mckinley_e9_bundles);
+}
+
+static int __init run_dmi_scan(void)
+{
+	dmi_setup();
+	return 0;
+}
+core_initcall(run_dmi_scan);
diff --git a/arch/ia64/kernel/sigframe.h b/arch/ia64/kernel/sigframe.h
new file mode 100644
index 000000000..58a36ce6c
--- /dev/null
+++ b/arch/ia64/kernel/sigframe.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+struct sigscratch {
+	unsigned long scratch_unat;	/* ar.unat for the general registers saved in pt */
+	unsigned long ar_pfs;		/* for syscalls, the user-level function-state  */
+	struct pt_regs pt;
+};
+
+struct sigframe {
+	/*
+	 * Place signal handler args where user-level unwinder can find them easily.
+	 * DO NOT MOVE THESE.  They are part of the IA-64 Linux ABI and there is
+	 * user-level code that depends on their presence!
+	 */
+	unsigned long arg0;		/* signum */
+	unsigned long arg1;		/* siginfo pointer */
+	unsigned long arg2;		/* sigcontext pointer */
+	/*
+	 * End of architected state.
+	 */
+
+	void __user *handler;		/* pointer to the plabel of the signal handler */
+	struct siginfo info;
+	struct sigcontext sc;
+};
+
+extern void ia64_do_signal (struct sigscratch *, long);
diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
new file mode 100644
index 000000000..51cf6a7ec
--- /dev/null
+++ b/arch/ia64/kernel/signal.c
@@ -0,0 +1,412 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Architecture-specific signal handling support.
+ *
+ * Copyright (C) 1999-2004 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Derived from i386 and Alpha versions.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/tty.h>
+#include <linux/binfmts.h>
+#include <linux/unistd.h>
+#include <linux/wait.h>
+
+#include <asm/intrinsics.h>
+#include <linux/uaccess.h>
+#include <asm/rse.h>
+#include <asm/sigcontext.h>
+
+#include "sigframe.h"
+
+#define DEBUG_SIG	0
+#define STACK_ALIGN	16		/* minimal alignment for stack pointer */
+
+#if _NSIG_WORDS > 1
+# define PUT_SIGSET(k,u)	__copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
+# define GET_SIGSET(k,u)	__copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
+#else
+# define PUT_SIGSET(k,u)	__put_user((k)->sig[0], &(u)->sig[0])
+# define GET_SIGSET(k,u)	__get_user((k)->sig[0], &(u)->sig[0])
+#endif
+
+static long
+restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
+{
+	unsigned long ip, flags, nat, um, cfm, rsc;
+	long err;
+
+	/* Always make any pending restarted system calls return -EINTR */
+	current->restart_block.fn = do_no_restart_syscall;
+
+	/* restore scratch that always needs gets updated during signal delivery: */
+	err  = __get_user(flags, &sc->sc_flags);
+	err |= __get_user(nat, &sc->sc_nat);
+	err |= __get_user(ip, &sc->sc_ip);			/* instruction pointer */
+	err |= __get_user(cfm, &sc->sc_cfm);
+	err |= __get_user(um, &sc->sc_um);			/* user mask */
+	err |= __get_user(rsc, &sc->sc_ar_rsc);
+	err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
+	err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
+	err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
+	err |= __get_user(scr->pt.pr, &sc->sc_pr);		/* predicates */
+	err |= __get_user(scr->pt.b0, &sc->sc_br[0]);		/* b0 (rp) */
+	err |= __get_user(scr->pt.b6, &sc->sc_br[6]);		/* b6 */
+	err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 8);	/* r1 */
+	err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8);	/* r8-r11 */
+	err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 2*8);	/* r12-r13 */
+	err |= __copy_from_user(&scr->pt.r15, &sc->sc_gr[15], 8);	/* r15 */
+
+	scr->pt.cr_ifs = cfm | (1UL << 63);
+	scr->pt.ar_rsc = rsc | (3 << 2); /* force PL3 */
+
+	/* establish new instruction pointer: */
+	scr->pt.cr_iip = ip & ~0x3UL;
+	ia64_psr(&scr->pt)->ri = ip & 0x3;
+	scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
+
+	scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
+
+	if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
+		/* Restore most scratch-state only when not in syscall. */
+		err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);		/* ar.ccv */
+		err |= __get_user(scr->pt.b7, &sc->sc_br[7]);			/* b7 */
+		err |= __get_user(scr->pt.r14, &sc->sc_gr[14]);			/* r14 */
+		err |= __copy_from_user(&scr->pt.ar_csd, &sc->sc_ar25, 2*8); /* ar.csd & ar.ssd */
+		err |= __copy_from_user(&scr->pt.r2, &sc->sc_gr[2], 2*8);	/* r2-r3 */
+		err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8);	/* r16-r31 */
+	}
+
+	if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
+		struct ia64_psr *psr = ia64_psr(&scr->pt);
+
+		err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
+		psr->mfh = 0;	/* drop signal handler's fph contents... */
+		preempt_disable();
+		if (psr->dfh)
+			ia64_drop_fpu(current);
+		else {
+			/* We already own the local fph, otherwise psr->dfh wouldn't be 0.  */
+			__ia64_load_fpu(current->thread.fph);
+			ia64_set_local_fpu_owner(current);
+		}
+		preempt_enable();
+	}
+	return err;
+}
+
+long
+ia64_rt_sigreturn (struct sigscratch *scr)
+{
+	extern char ia64_strace_leave_kernel, ia64_leave_kernel;
+	struct sigcontext __user *sc;
+	sigset_t set;
+	long retval;
+
+	sc = &((struct sigframe __user *) (scr->pt.r12 + 16))->sc;
+
+	/*
+	 * When we return to the previously executing context, r8 and r10 have already
+	 * been setup the way we want them.  Indeed, if the signal wasn't delivered while
+	 * in a system call, we must not touch r8 or r10 as otherwise user-level state
+	 * could be corrupted.
+	 */
+	retval = (long) &ia64_leave_kernel;
+	if (test_thread_flag(TIF_SYSCALL_TRACE)
+	    || test_thread_flag(TIF_SYSCALL_AUDIT))
+		/*
+		 * strace expects to be notified after sigreturn returns even though the
+		 * context to which we return may not be in the middle of a syscall.
+		 * Thus, the return-value that strace displays for sigreturn is
+		 * meaningless.
+		 */
+		retval = (long) &ia64_strace_leave_kernel;
+
+	if (!access_ok(sc, sizeof(*sc)))
+		goto give_sigsegv;
+
+	if (GET_SIGSET(&set, &sc->sc_mask))
+		goto give_sigsegv;
+
+	set_current_blocked(&set);
+
+	if (restore_sigcontext(sc, scr))
+		goto give_sigsegv;
+
+#if DEBUG_SIG
+	printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
+	       current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
+#endif
+	if (restore_altstack(&sc->sc_stack))
+		goto give_sigsegv;
+	return retval;
+
+  give_sigsegv:
+	force_sig(SIGSEGV);
+	return retval;
+}
+
+/*
+ * This does just the minimum required setup of sigcontext.
+ * Specifically, it only installs data that is either not knowable at
+ * the user-level or that gets modified before execution in the
+ * trampoline starts.  Everything else is done at the user-level.
+ */
+static long
+setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr)
+{
+	unsigned long flags = 0, ifs, cfm, nat;
+	long err = 0;
+
+	ifs = scr->pt.cr_ifs;
+
+	if (on_sig_stack((unsigned long) sc))
+		flags |= IA64_SC_FLAG_ONSTACK;
+	if ((ifs & (1UL << 63)) == 0)
+		/* if cr_ifs doesn't have the valid bit set, we got here through a syscall */
+		flags |= IA64_SC_FLAG_IN_SYSCALL;
+	cfm = ifs & ((1UL << 38) - 1);
+	ia64_flush_fph(current);
+	if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
+		flags |= IA64_SC_FLAG_FPH_VALID;
+		err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
+	}
+
+	nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
+
+	err |= __put_user(flags, &sc->sc_flags);
+	err |= __put_user(nat, &sc->sc_nat);
+	err |= PUT_SIGSET(mask, &sc->sc_mask);
+	err |= __put_user(cfm, &sc->sc_cfm);
+	err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
+	err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
+	err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat);		/* ar.unat */
+	err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);		/* ar.fpsr */
+	err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
+	err |= __put_user(scr->pt.pr, &sc->sc_pr);			/* predicates */
+	err |= __put_user(scr->pt.b0, &sc->sc_br[0]);			/* b0 (rp) */
+	err |= __put_user(scr->pt.b6, &sc->sc_br[6]);			/* b6 */
+	err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 8);		/* r1 */
+	err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8);		/* r8-r11 */
+	err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 2*8);	/* r12-r13 */
+	err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8);		/* r15 */
+	err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
+
+	if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
+		/* Copy scratch regs to sigcontext if the signal didn't interrupt a syscall. */
+		err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);		/* ar.ccv */
+		err |= __put_user(scr->pt.b7, &sc->sc_br[7]);			/* b7 */
+		err |= __put_user(scr->pt.r14, &sc->sc_gr[14]);			/* r14 */
+		err |= __copy_to_user(&sc->sc_ar25, &scr->pt.ar_csd, 2*8); /* ar.csd & ar.ssd */
+		err |= __copy_to_user(&sc->sc_gr[2], &scr->pt.r2, 2*8);		/* r2-r3 */
+		err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8);	/* r16-r31 */
+	}
+	return err;
+}
+
+/*
+ * Check whether the register-backing store is already on the signal stack.
+ */
+static inline int
+rbs_on_sig_stack (unsigned long bsp)
+{
+	return (bsp - current->sas_ss_sp < current->sas_ss_size);
+}
+
+static long
+setup_frame(struct ksignal *ksig, sigset_t *set, struct sigscratch *scr)
+{
+	extern char __kernel_sigtramp[];
+	unsigned long tramp_addr, new_rbs = 0, new_sp;
+	struct sigframe __user *frame;
+	long err;
+
+	new_sp = scr->pt.r12;
+	tramp_addr = (unsigned long) __kernel_sigtramp;
+	if (ksig->ka.sa.sa_flags & SA_ONSTACK) {
+		int onstack = sas_ss_flags(new_sp);
+
+		if (onstack == 0) {
+			new_sp = current->sas_ss_sp + current->sas_ss_size;
+			/*
+			 * We need to check for the register stack being on the
+			 * signal stack separately, because it's switched
+			 * separately (memory stack is switched in the kernel,
+			 * register stack is switched in the signal trampoline).
+			 */
+			if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
+				new_rbs = ALIGN(current->sas_ss_sp,
+						sizeof(long));
+		} else if (onstack == SS_ONSTACK) {
+			unsigned long check_sp;
+
+			/*
+			 * If we are on the alternate signal stack and would
+			 * overflow it, don't. Return an always-bogus address
+			 * instead so we will die with SIGSEGV.
+			 */
+			check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
+			if (!likely(on_sig_stack(check_sp))) {
+				force_sigsegv(ksig->sig);
+				return 1;
+			}
+		}
+	}
+	frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);
+
+	if (!access_ok(frame, sizeof(*frame))) {
+		force_sigsegv(ksig->sig);
+		return 1;
+	}
+
+	err  = __put_user(ksig->sig, &frame->arg0);
+	err |= __put_user(&frame->info, &frame->arg1);
+	err |= __put_user(&frame->sc, &frame->arg2);
+	err |= __put_user(new_rbs, &frame->sc.sc_rbs_base);
+	err |= __put_user(0, &frame->sc.sc_loadrs);	/* initialize to zero */
+	err |= __put_user(ksig->ka.sa.sa_handler, &frame->handler);
+
+	err |= copy_siginfo_to_user(&frame->info, &ksig->info);
+
+	err |= __save_altstack(&frame->sc.sc_stack, scr->pt.r12);
+	err |= setup_sigcontext(&frame->sc, set, scr);
+
+	if (unlikely(err)) {
+		force_sigsegv(ksig->sig);
+		return 1;
+	}
+
+	scr->pt.r12 = (unsigned long) frame - 16;	/* new stack pointer */
+	scr->pt.ar_fpsr = FPSR_DEFAULT;			/* reset fpsr for signal handler */
+	scr->pt.cr_iip = tramp_addr;
+	ia64_psr(&scr->pt)->ri = 0;			/* start executing in first slot */
+	ia64_psr(&scr->pt)->be = 0;			/* force little-endian byte-order */
+	/*
+	 * Force the interruption function mask to zero.  This has no effect when a
+	 * system-call got interrupted by a signal (since, in that case, scr->pt_cr_ifs is
+	 * ignored), but it has the desirable effect of making it possible to deliver a
+	 * signal with an incomplete register frame (which happens when a mandatory RSE
+	 * load faults).  Furthermore, it has no negative effect on the getting the user's
+	 * dirty partition preserved, because that's governed by scr->pt.loadrs.
+	 */
+	scr->pt.cr_ifs = (1UL << 63);
+
+	/*
+	 * Note: this affects only the NaT bits of the scratch regs (the ones saved in
+	 * pt_regs), which is exactly what we want.
+	 */
+	scr->scratch_unat = 0; /* ensure NaT bits of r12 is clear */
+
+#if DEBUG_SIG
+	printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n",
+	       current->comm, current->pid, ksig->sig, scr->pt.r12, frame->sc.sc_ip, frame->handler);
+#endif
+	return 0;
+}
+
+static long
+handle_signal (struct ksignal *ksig, struct sigscratch *scr)
+{
+	int ret = setup_frame(ksig, sigmask_to_save(), scr);
+
+	if (!ret)
+		signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
+
+	return ret;
+}
+
+/*
+ * Note that `init' is a special process: it doesn't get signals it doesn't want to
+ * handle.  Thus you cannot kill init even with a SIGKILL even by mistake.
+ */
+void
+ia64_do_signal (struct sigscratch *scr, long in_syscall)
+{
+	long restart = in_syscall;
+	long errno = scr->pt.r8;
+	struct ksignal ksig;
+
+	/*
+	 * This only loops in the rare cases of handle_signal() failing, in which case we
+	 * need to push through a forced SIGSEGV.
+	 */
+	while (1) {
+		if (!get_signal(&ksig))
+			break;
+
+		/*
+		 * get_signal() may have run a debugger (via notify_parent())
+		 * and the debugger may have modified the state (e.g., to arrange for an
+		 * inferior call), thus it's important to check for restarting _after_
+		 * get_signal().
+		 */
+		if ((long) scr->pt.r10 != -1)
+			/*
+			 * A system calls has to be restarted only if one of the error codes
+			 * ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned.  If r10
+			 * isn't -1 then r8 doesn't hold an error code and we don't need to
+			 * restart the syscall, so we can clear the "restart" flag here.
+			 */
+			restart = 0;
+
+		if (ksig.sig <= 0)
+			break;
+
+		if (unlikely(restart)) {
+			switch (errno) {
+			case ERESTART_RESTARTBLOCK:
+			case ERESTARTNOHAND:
+				scr->pt.r8 = EINTR;
+				/* note: scr->pt.r10 is already -1 */
+				break;
+			case ERESTARTSYS:
+				if ((ksig.ka.sa.sa_flags & SA_RESTART) == 0) {
+					scr->pt.r8 = EINTR;
+					/* note: scr->pt.r10 is already -1 */
+					break;
+				}
+				fallthrough;
+			case ERESTARTNOINTR:
+				ia64_decrement_ip(&scr->pt);
+				restart = 0; /* don't restart twice if handle_signal() fails... */
+			}
+		}
+
+		/*
+		 * Whee!  Actually deliver the signal.  If the delivery failed, we need to
+		 * continue to iterate in this loop so we can deliver the SIGSEGV...
+		 */
+		if (handle_signal(&ksig, scr))
+			return;
+	}
+
+	/* Did we come from a system call? */
+	if (restart) {
+		/* Restart the system call - no handlers present */
+		if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR
+		    || errno == ERESTART_RESTARTBLOCK)
+		{
+			/*
+			 * Note: the syscall number is in r15 which is saved in
+			 * pt_regs so all we need to do here is adjust ip so that
+			 * the "break" instruction gets re-executed.
+			 */
+			ia64_decrement_ip(&scr->pt);
+			if (errno == ERESTART_RESTARTBLOCK)
+				scr->pt.r15 = __NR_restart_syscall;
+		}
+	}
+
+	/* if there's no signal to deliver, we just put the saved sigmask
+	 * back */
+	restore_saved_sigmask();
+}
diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
new file mode 100644
index 000000000..e2cc59db8
--- /dev/null
+++ b/arch/ia64/kernel/smp.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SMP Support
+ *
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999, 2001, 2003 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Lots of stuff stolen from arch/alpha/kernel/smp.c
+ *
+ * 01/05/16 Rohit Seth <rohit.seth@intel.com>  IA64-SMP functions. Reorganized
+ * the existing code (on the lines of x86 port).
+ * 00/09/11 David Mosberger <davidm@hpl.hp.com> Do loops_per_jiffy
+ * calibration on each CPU.
+ * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> fixed logical processor id
+ * 00/03/31 Rohit Seth <rohit.seth@intel.com>	Fixes for Bootstrap Processor
+ * & cpu_online_map now gets done here (instead of setup.c)
+ * 99/10/05 davidm	Update to bring it in sync with new command-line processing
+ *  scheme.
+ * 10/13/00 Goutham Rao <goutham.rao@intel.com> Updated smp_call_function and
+ *		smp_call_function_single to resend IPI on timeouts
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/kernel_stat.h>
+#include <linux/mm.h>
+#include <linux/cache.h>
+#include <linux/delay.h>
+#include <linux/efi.h>
+#include <linux/bitops.h>
+#include <linux/kexec.h>
+
+#include <linux/atomic.h>
+#include <asm/current.h>
+#include <asm/delay.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/sal.h>
+#include <asm/tlbflush.h>
+#include <asm/unistd.h>
+#include <asm/mca.h>
+#include <asm/xtp.h>
+
+/*
+ * Note: alignment of 4 entries/cacheline was empirically determined
+ * to be a good tradeoff between hot cachelines & spreading the array
+ * across too many cacheline.
+ */
+static struct local_tlb_flush_counts {
+	unsigned int count;
+} __attribute__((__aligned__(32))) local_tlb_flush_counts[NR_CPUS];
+
+static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned short [NR_CPUS],
+				     shadow_flush_counts);
+
+#define IPI_CALL_FUNC		0
+#define IPI_CPU_STOP		1
+#define IPI_CALL_FUNC_SINGLE	2
+#define IPI_KDUMP_CPU_STOP	3
+
+/* This needs to be cacheline aligned because it is written to by *other* CPUs.  */
+static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned long, ipi_operation);
+
+extern void cpu_halt (void);
+
+static void
+stop_this_cpu(void)
+{
+	/*
+	 * Remove this CPU:
+	 */
+	set_cpu_online(smp_processor_id(), false);
+	max_xtp();
+	local_irq_disable();
+	cpu_halt();
+}
+
+void
+cpu_die(void)
+{
+	max_xtp();
+	local_irq_disable();
+	cpu_halt();
+	/* Should never be here */
+	BUG();
+	for (;;);
+}
+
+irqreturn_t
+handle_IPI (int irq, void *dev_id)
+{
+	int this_cpu = get_cpu();
+	unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation);
+	unsigned long ops;
+
+	mb();	/* Order interrupt and bit testing. */
+	while ((ops = xchg(pending_ipis, 0)) != 0) {
+		mb();	/* Order bit clearing and data access. */
+		do {
+			unsigned long which;
+
+			which = ffz(~ops);
+			ops &= ~(1 << which);
+
+			switch (which) {
+			case IPI_CPU_STOP:
+				stop_this_cpu();
+				break;
+			case IPI_CALL_FUNC:
+				generic_smp_call_function_interrupt();
+				break;
+			case IPI_CALL_FUNC_SINGLE:
+				generic_smp_call_function_single_interrupt();
+				break;
+#ifdef CONFIG_KEXEC
+			case IPI_KDUMP_CPU_STOP:
+				unw_init_running(kdump_cpu_freeze, NULL);
+				break;
+#endif
+			default:
+				printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n",
+						this_cpu, which);
+				break;
+			}
+		} while (ops);
+		mb();	/* Order data access and bit testing. */
+	}
+	put_cpu();
+	return IRQ_HANDLED;
+}
+
+
+
+/*
+ * Called with preemption disabled.
+ */
+static inline void
+send_IPI_single (int dest_cpu, int op)
+{
+	set_bit(op, &per_cpu(ipi_operation, dest_cpu));
+	ia64_send_ipi(dest_cpu, IA64_IPI_VECTOR, IA64_IPI_DM_INT, 0);
+}
+
+/*
+ * Called with preemption disabled.
+ */
+static inline void
+send_IPI_allbutself (int op)
+{
+	unsigned int i;
+
+	for_each_online_cpu(i) {
+		if (i != smp_processor_id())
+			send_IPI_single(i, op);
+	}
+}
+
+/*
+ * Called with preemption disabled.
+ */
+static inline void
+send_IPI_mask(const struct cpumask *mask, int op)
+{
+	unsigned int cpu;
+
+	for_each_cpu(cpu, mask) {
+			send_IPI_single(cpu, op);
+	}
+}
+
+/*
+ * Called with preemption disabled.
+ */
+static inline void
+send_IPI_all (int op)
+{
+	int i;
+
+	for_each_online_cpu(i) {
+		send_IPI_single(i, op);
+	}
+}
+
+/*
+ * Called with preemption disabled.
+ */
+static inline void
+send_IPI_self (int op)
+{
+	send_IPI_single(smp_processor_id(), op);
+}
+
+#ifdef CONFIG_KEXEC
+void
+kdump_smp_send_stop(void)
+{
+ 	send_IPI_allbutself(IPI_KDUMP_CPU_STOP);
+}
+
+void
+kdump_smp_send_init(void)
+{
+	unsigned int cpu, self_cpu;
+	self_cpu = smp_processor_id();
+	for_each_online_cpu(cpu) {
+		if (cpu != self_cpu) {
+			if(kdump_status[cpu] == 0)
+				ia64_send_ipi(cpu, 0, IA64_IPI_DM_INIT, 0);
+		}
+	}
+}
+#endif
+/*
+ * Called with preemption disabled.
+ */
+void
+smp_send_reschedule (int cpu)
+{
+	ia64_send_ipi(cpu, IA64_IPI_RESCHEDULE, IA64_IPI_DM_INT, 0);
+}
+EXPORT_SYMBOL_GPL(smp_send_reschedule);
+
+/*
+ * Called with preemption disabled.
+ */
+static void
+smp_send_local_flush_tlb (int cpu)
+{
+	ia64_send_ipi(cpu, IA64_IPI_LOCAL_TLB_FLUSH, IA64_IPI_DM_INT, 0);
+}
+
+void
+smp_local_flush_tlb(void)
+{
+	/*
+	 * Use atomic ops. Otherwise, the load/increment/store sequence from
+	 * a "++" operation can have the line stolen between the load & store.
+	 * The overhead of the atomic op in negligible in this case & offers
+	 * significant benefit for the brief periods where lots of cpus
+	 * are simultaneously flushing TLBs.
+	 */
+	ia64_fetchadd(1, &local_tlb_flush_counts[smp_processor_id()].count, acq);
+	local_flush_tlb_all();
+}
+
+#define FLUSH_DELAY	5 /* Usec backoff to eliminate excessive cacheline bouncing */
+
+void
+smp_flush_tlb_cpumask(cpumask_t xcpumask)
+{
+	unsigned short *counts = __ia64_per_cpu_var(shadow_flush_counts);
+	cpumask_t cpumask = xcpumask;
+	int mycpu, cpu, flush_mycpu = 0;
+
+	preempt_disable();
+	mycpu = smp_processor_id();
+
+	for_each_cpu(cpu, &cpumask)
+		counts[cpu] = local_tlb_flush_counts[cpu].count & 0xffff;
+
+	mb();
+	for_each_cpu(cpu, &cpumask) {
+		if (cpu == mycpu)
+			flush_mycpu = 1;
+		else
+			smp_send_local_flush_tlb(cpu);
+	}
+
+	if (flush_mycpu)
+		smp_local_flush_tlb();
+
+	for_each_cpu(cpu, &cpumask)
+		while(counts[cpu] == (local_tlb_flush_counts[cpu].count & 0xffff))
+			udelay(FLUSH_DELAY);
+
+	preempt_enable();
+}
+
+void
+smp_flush_tlb_all (void)
+{
+	on_each_cpu((void (*)(void *))local_flush_tlb_all, NULL, 1);
+}
+
+void
+smp_flush_tlb_mm (struct mm_struct *mm)
+{
+	cpumask_var_t cpus;
+	preempt_disable();
+	/* this happens for the common case of a single-threaded fork():  */
+	if (likely(mm == current->active_mm && atomic_read(&mm->mm_users) == 1))
+	{
+		local_finish_flush_tlb_mm(mm);
+		preempt_enable();
+		return;
+	}
+	if (!alloc_cpumask_var(&cpus, GFP_ATOMIC)) {
+		smp_call_function((void (*)(void *))local_finish_flush_tlb_mm,
+			mm, 1);
+	} else {
+		cpumask_copy(cpus, mm_cpumask(mm));
+		smp_call_function_many(cpus,
+			(void (*)(void *))local_finish_flush_tlb_mm, mm, 1);
+		free_cpumask_var(cpus);
+	}
+	local_irq_disable();
+	local_finish_flush_tlb_mm(mm);
+	local_irq_enable();
+	preempt_enable();
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+	send_IPI_single(cpu, IPI_CALL_FUNC_SINGLE);
+}
+
+void arch_send_call_function_ipi_mask(const struct cpumask *mask)
+{
+	send_IPI_mask(mask, IPI_CALL_FUNC);
+}
+
+/*
+ * this function calls the 'stop' function on all other CPUs in the system.
+ */
+void
+smp_send_stop (void)
+{
+	send_IPI_allbutself(IPI_CPU_STOP);
+}
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
new file mode 100644
index 000000000..d0e935cf2
--- /dev/null
+++ b/arch/ia64/kernel/smpboot.c
@@ -0,0 +1,839 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SMP boot-related support
+ *
+ * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2001, 2004-2005 Intel Corp
+ * 	Rohit Seth <rohit.seth@intel.com>
+ * 	Suresh Siddha <suresh.b.siddha@intel.com>
+ * 	Gordon Jin <gordon.jin@intel.com>
+ *	Ashok Raj  <ashok.raj@intel.com>
+ *
+ * 01/05/16 Rohit Seth <rohit.seth@intel.com>	Moved SMP booting functions from smp.c to here.
+ * 01/04/27 David Mosberger <davidm@hpl.hp.com>	Added ITC synching code.
+ * 02/07/31 David Mosberger <davidm@hpl.hp.com>	Switch over to hotplug-CPU boot-sequence.
+ *						smp_boot_cpus()/smp_commence() is replaced by
+ *						smp_prepare_cpus()/__cpu_up()/smp_cpus_done().
+ * 04/06/21 Ashok Raj		<ashok.raj@intel.com> Added CPU Hotplug Support
+ * 04/12/26 Jin Gordon <gordon.jin@intel.com>
+ * 04/12/26 Rohit Seth <rohit.seth@intel.com>
+ *						Add multi-threading and multi-core detection
+ * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com>
+ *						Setup cpu_sibling_map and cpu_core_map
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/memblock.h>
+#include <linux/cpu.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/mm.h>
+#include <linux/notifier.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/efi.h>
+#include <linux/percpu.h>
+#include <linux/bitops.h>
+
+#include <linux/atomic.h>
+#include <asm/cache.h>
+#include <asm/current.h>
+#include <asm/delay.h>
+#include <asm/efi.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mca.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/sal.h>
+#include <asm/tlbflush.h>
+#include <asm/unistd.h>
+
+#define SMP_DEBUG 0
+
+#if SMP_DEBUG
+#define Dprintk(x...)  printk(x)
+#else
+#define Dprintk(x...)
+#endif
+
+#ifdef CONFIG_HOTPLUG_CPU
+#ifdef CONFIG_PERMIT_BSP_REMOVE
+#define bsp_remove_ok	1
+#else
+#define bsp_remove_ok	0
+#endif
+
+/*
+ * Global array allocated for NR_CPUS at boot time
+ */
+struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS];
+
+/*
+ * start_ap in head.S uses this to store current booting cpu
+ * info.
+ */
+struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0];
+
+#define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]);
+
+#else
+#define set_brendez_area(x)
+#endif
+
+
+/*
+ * ITC synchronization related stuff:
+ */
+#define MASTER	(0)
+#define SLAVE	(SMP_CACHE_BYTES/8)
+
+#define NUM_ROUNDS	64	/* magic value */
+#define NUM_ITERS	5	/* likewise */
+
+static DEFINE_SPINLOCK(itc_sync_lock);
+static volatile unsigned long go[SLAVE + 1];
+
+#define DEBUG_ITC_SYNC	0
+
+extern void start_ap (void);
+extern unsigned long ia64_iobase;
+
+struct task_struct *task_for_booting_cpu;
+
+/*
+ * State for each CPU
+ */
+DEFINE_PER_CPU(int, cpu_state);
+
+cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
+EXPORT_SYMBOL(cpu_core_map);
+DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
+EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
+
+int smp_num_siblings = 1;
+
+/* which logical CPU number maps to which CPU (physical APIC ID) */
+volatile int ia64_cpu_to_sapicid[NR_CPUS];
+EXPORT_SYMBOL(ia64_cpu_to_sapicid);
+
+static cpumask_t cpu_callin_map;
+
+struct smp_boot_data smp_boot_data __initdata;
+
+unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */
+
+char __initdata no_int_routing;
+
+unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */
+
+#ifdef CONFIG_FORCE_CPEI_RETARGET
+#define CPEI_OVERRIDE_DEFAULT	(1)
+#else
+#define CPEI_OVERRIDE_DEFAULT	(0)
+#endif
+
+unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT;
+
+static int __init
+cmdl_force_cpei(char *str)
+{
+	int value=0;
+
+	get_option (&str, &value);
+	force_cpei_retarget = value;
+
+	return 1;
+}
+
+__setup("force_cpei=", cmdl_force_cpei);
+
+static int __init
+nointroute (char *str)
+{
+	no_int_routing = 1;
+	printk ("no_int_routing on\n");
+	return 1;
+}
+
+__setup("nointroute", nointroute);
+
+static void fix_b0_for_bsp(void)
+{
+#ifdef CONFIG_HOTPLUG_CPU
+	int cpuid;
+	static int fix_bsp_b0 = 1;
+
+	cpuid = smp_processor_id();
+
+	/*
+	 * Cache the b0 value on the first AP that comes up
+	 */
+	if (!(fix_bsp_b0 && cpuid))
+		return;
+
+	sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0];
+	printk ("Fixed BSP b0 value from CPU %d\n", cpuid);
+
+	fix_bsp_b0 = 0;
+#endif
+}
+
+void
+sync_master (void *arg)
+{
+	unsigned long flags, i;
+
+	go[MASTER] = 0;
+
+	local_irq_save(flags);
+	{
+		for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) {
+			while (!go[MASTER])
+				cpu_relax();
+			go[MASTER] = 0;
+			go[SLAVE] = ia64_get_itc();
+		}
+	}
+	local_irq_restore(flags);
+}
+
+/*
+ * Return the number of cycles by which our itc differs from the itc on the master
+ * (time-keeper) CPU.  A positive number indicates our itc is ahead of the master,
+ * negative that it is behind.
+ */
+static inline long
+get_delta (long *rt, long *master)
+{
+	unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0;
+	unsigned long tcenter, t0, t1, tm;
+	long i;
+
+	for (i = 0; i < NUM_ITERS; ++i) {
+		t0 = ia64_get_itc();
+		go[MASTER] = 1;
+		while (!(tm = go[SLAVE]))
+			cpu_relax();
+		go[SLAVE] = 0;
+		t1 = ia64_get_itc();
+
+		if (t1 - t0 < best_t1 - best_t0)
+			best_t0 = t0, best_t1 = t1, best_tm = tm;
+	}
+
+	*rt = best_t1 - best_t0;
+	*master = best_tm - best_t0;
+
+	/* average best_t0 and best_t1 without overflow: */
+	tcenter = (best_t0/2 + best_t1/2);
+	if (best_t0 % 2 + best_t1 % 2 == 2)
+		++tcenter;
+	return tcenter - best_tm;
+}
+
+/*
+ * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU
+ * (normally the time-keeper CPU).  We use a closed loop to eliminate the possibility of
+ * unaccounted-for errors (such as getting a machine check in the middle of a calibration
+ * step).  The basic idea is for the slave to ask the master what itc value it has and to
+ * read its own itc before and after the master responds.  Each iteration gives us three
+ * timestamps:
+ *
+ *	slave		master
+ *
+ *	t0 ---\
+ *             ---\
+ *		   --->
+ *			tm
+ *		   /---
+ *	       /---
+ *	t1 <---
+ *
+ *
+ * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0
+ * and t1.  If we achieve this, the clocks are synchronized provided the interconnect
+ * between the slave and the master is symmetric.  Even if the interconnect were
+ * asymmetric, we would still know that the synchronization error is smaller than the
+ * roundtrip latency (t0 - t1).
+ *
+ * When the interconnect is quiet and symmetric, this lets us synchronize the itc to
+ * within one or two cycles.  However, we can only *guarantee* that the synchronization is
+ * accurate to within a round-trip time, which is typically in the range of several
+ * hundred cycles (e.g., ~500 cycles).  In practice, this means that the itc's are usually
+ * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better
+ * than half a micro second or so.
+ */
+void
+ia64_sync_itc (unsigned int master)
+{
+	long i, delta, adj, adjust_latency = 0, done = 0;
+	unsigned long flags, rt, master_time_stamp, bound;
+#if DEBUG_ITC_SYNC
+	struct {
+		long rt;	/* roundtrip time */
+		long master;	/* master's timestamp */
+		long diff;	/* difference between midpoint and master's timestamp */
+		long lat;	/* estimate of itc adjustment latency */
+	} t[NUM_ROUNDS];
+#endif
+
+	/*
+	 * Make sure local timer ticks are disabled while we sync.  If
+	 * they were enabled, we'd have to worry about nasty issues
+	 * like setting the ITC ahead of (or a long time before) the
+	 * next scheduled tick.
+	 */
+	BUG_ON((ia64_get_itv() & (1 << 16)) == 0);
+
+	go[MASTER] = 1;
+
+	if (smp_call_function_single(master, sync_master, NULL, 0) < 0) {
+		printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master);
+		return;
+	}
+
+	while (go[MASTER])
+		cpu_relax();	/* wait for master to be ready */
+
+	spin_lock_irqsave(&itc_sync_lock, flags);
+	{
+		for (i = 0; i < NUM_ROUNDS; ++i) {
+			delta = get_delta(&rt, &master_time_stamp);
+			if (delta == 0) {
+				done = 1;	/* let's lock on to this... */
+				bound = rt;
+			}
+
+			if (!done) {
+				if (i > 0) {
+					adjust_latency += -delta;
+					adj = -delta + adjust_latency/4;
+				} else
+					adj = -delta;
+
+				ia64_set_itc(ia64_get_itc() + adj);
+			}
+#if DEBUG_ITC_SYNC
+			t[i].rt = rt;
+			t[i].master = master_time_stamp;
+			t[i].diff = delta;
+			t[i].lat = adjust_latency/4;
+#endif
+		}
+	}
+	spin_unlock_irqrestore(&itc_sync_lock, flags);
+
+#if DEBUG_ITC_SYNC
+	for (i = 0; i < NUM_ROUNDS; ++i)
+		printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n",
+		       t[i].rt, t[i].master, t[i].diff, t[i].lat);
+#endif
+
+	printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, "
+	       "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt);
+}
+
+/*
+ * Ideally sets up per-cpu profiling hooks.  Doesn't do much now...
+ */
+static inline void smp_setup_percpu_timer(void)
+{
+}
+
+static void
+smp_callin (void)
+{
+	int cpuid, phys_id, itc_master;
+	struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo;
+	extern void ia64_init_itm(void);
+	extern volatile int time_keeper_id;
+
+	cpuid = smp_processor_id();
+	phys_id = hard_smp_processor_id();
+	itc_master = time_keeper_id;
+
+	if (cpu_online(cpuid)) {
+		printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n",
+		       phys_id, cpuid);
+		BUG();
+	}
+
+	fix_b0_for_bsp();
+
+	/*
+	 * numa_node_id() works after this.
+	 */
+	set_numa_node(cpu_to_node_map[cpuid]);
+	set_numa_mem(local_memory_node(cpu_to_node_map[cpuid]));
+
+	spin_lock(&vector_lock);
+	/* Setup the per cpu irq handling data structures */
+	__setup_vector_irq(cpuid);
+	notify_cpu_starting(cpuid);
+	set_cpu_online(cpuid, true);
+	per_cpu(cpu_state, cpuid) = CPU_ONLINE;
+	spin_unlock(&vector_lock);
+
+	smp_setup_percpu_timer();
+
+	ia64_mca_cmc_vector_setup();	/* Setup vector on AP */
+
+	local_irq_enable();
+
+	if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) {
+		/*
+		 * Synchronize the ITC with the BP.  Need to do this after irqs are
+		 * enabled because ia64_sync_itc() calls smp_call_function_single(), which
+		 * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls
+		 * local_bh_enable(), which bugs out if irqs are not enabled...
+		 */
+		Dprintk("Going to syncup ITC with ITC Master.\n");
+		ia64_sync_itc(itc_master);
+	}
+
+	/*
+	 * Get our bogomips.
+	 */
+	ia64_init_itm();
+
+	/*
+	 * Delay calibration can be skipped if new processor is identical to the
+	 * previous processor.
+	 */
+	last_cpuinfo = cpu_data(cpuid - 1);
+	this_cpuinfo = local_cpu_data;
+	if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq ||
+	    last_cpuinfo->proc_freq != this_cpuinfo->proc_freq ||
+	    last_cpuinfo->features != this_cpuinfo->features ||
+	    last_cpuinfo->revision != this_cpuinfo->revision ||
+	    last_cpuinfo->family != this_cpuinfo->family ||
+	    last_cpuinfo->archrev != this_cpuinfo->archrev ||
+	    last_cpuinfo->model != this_cpuinfo->model)
+		calibrate_delay();
+	local_cpu_data->loops_per_jiffy = loops_per_jiffy;
+
+	/*
+	 * Allow the master to continue.
+	 */
+	cpumask_set_cpu(cpuid, &cpu_callin_map);
+	Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid);
+}
+
+
+/*
+ * Activate a secondary processor.  head.S calls this.
+ */
+int
+start_secondary (void *unused)
+{
+	/* Early console may use I/O ports */
+	ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase));
+#ifndef CONFIG_PRINTK_TIME
+	Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id());
+#endif
+	efi_map_pal_code();
+	cpu_init();
+	smp_callin();
+
+	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
+	return 0;
+}
+
+static int
+do_boot_cpu (int sapicid, int cpu, struct task_struct *idle)
+{
+	int timeout;
+
+	task_for_booting_cpu = idle;
+	Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid);
+
+	set_brendez_area(cpu);
+	ia64_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0);
+
+	/*
+	 * Wait 10s total for the AP to start
+	 */
+	Dprintk("Waiting on callin_map ...");
+	for (timeout = 0; timeout < 100000; timeout++) {
+		if (cpumask_test_cpu(cpu, &cpu_callin_map))
+			break;  /* It has booted */
+		barrier(); /* Make sure we re-read cpu_callin_map */
+		udelay(100);
+	}
+	Dprintk("\n");
+
+	if (!cpumask_test_cpu(cpu, &cpu_callin_map)) {
+		printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid);
+		ia64_cpu_to_sapicid[cpu] = -1;
+		set_cpu_online(cpu, false);  /* was set in smp_callin() */
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int __init
+decay (char *str)
+{
+	int ticks;
+	get_option (&str, &ticks);
+	return 1;
+}
+
+__setup("decay=", decay);
+
+/*
+ * Initialize the logical CPU number to SAPICID mapping
+ */
+void __init
+smp_build_cpu_map (void)
+{
+	int sapicid, cpu, i;
+	int boot_cpu_id = hard_smp_processor_id();
+
+	for (cpu = 0; cpu < NR_CPUS; cpu++) {
+		ia64_cpu_to_sapicid[cpu] = -1;
+	}
+
+	ia64_cpu_to_sapicid[0] = boot_cpu_id;
+	init_cpu_present(cpumask_of(0));
+	set_cpu_possible(0, true);
+	for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) {
+		sapicid = smp_boot_data.cpu_phys_id[i];
+		if (sapicid == boot_cpu_id)
+			continue;
+		set_cpu_present(cpu, true);
+		set_cpu_possible(cpu, true);
+		ia64_cpu_to_sapicid[cpu] = sapicid;
+		cpu++;
+	}
+}
+
+/*
+ * Cycle through the APs sending Wakeup IPIs to boot each.
+ */
+void __init
+smp_prepare_cpus (unsigned int max_cpus)
+{
+	int boot_cpu_id = hard_smp_processor_id();
+
+	/*
+	 * Initialize the per-CPU profiling counter/multiplier
+	 */
+
+	smp_setup_percpu_timer();
+
+	cpumask_set_cpu(0, &cpu_callin_map);
+
+	local_cpu_data->loops_per_jiffy = loops_per_jiffy;
+	ia64_cpu_to_sapicid[0] = boot_cpu_id;
+
+	printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id);
+
+	current_thread_info()->cpu = 0;
+
+	/*
+	 * If SMP should be disabled, then really disable it!
+	 */
+	if (!max_cpus) {
+		printk(KERN_INFO "SMP mode deactivated.\n");
+		init_cpu_online(cpumask_of(0));
+		init_cpu_present(cpumask_of(0));
+		init_cpu_possible(cpumask_of(0));
+		return;
+	}
+}
+
+void smp_prepare_boot_cpu(void)
+{
+	set_cpu_online(smp_processor_id(), true);
+	cpumask_set_cpu(smp_processor_id(), &cpu_callin_map);
+	set_numa_node(cpu_to_node_map[smp_processor_id()]);
+	per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static inline void
+clear_cpu_sibling_map(int cpu)
+{
+	int i;
+
+	for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu))
+		cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i));
+	for_each_cpu(i, &cpu_core_map[cpu])
+		cpumask_clear_cpu(cpu, &cpu_core_map[i]);
+
+	per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE;
+}
+
+static void
+remove_siblinginfo(int cpu)
+{
+	if (cpu_data(cpu)->threads_per_core == 1 &&
+	    cpu_data(cpu)->cores_per_socket == 1) {
+		cpumask_clear_cpu(cpu, &cpu_core_map[cpu]);
+		cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, cpu));
+		return;
+	}
+
+	/* remove it from all sibling map's */
+	clear_cpu_sibling_map(cpu);
+}
+
+extern void fixup_irqs(void);
+
+int migrate_platform_irqs(unsigned int cpu)
+{
+	int new_cpei_cpu;
+	struct irq_data *data = NULL;
+	const struct cpumask *mask;
+	int 		retval = 0;
+
+	/*
+	 * dont permit CPEI target to removed.
+	 */
+	if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) {
+		printk ("CPU (%d) is CPEI Target\n", cpu);
+		if (can_cpei_retarget()) {
+			/*
+			 * Now re-target the CPEI to a different processor
+			 */
+			new_cpei_cpu = cpumask_any(cpu_online_mask);
+			mask = cpumask_of(new_cpei_cpu);
+			set_cpei_target_cpu(new_cpei_cpu);
+			data = irq_get_irq_data(ia64_cpe_irq);
+			/*
+			 * Switch for now, immediately, we need to do fake intr
+			 * as other interrupts, but need to study CPEI behaviour with
+			 * polling before making changes.
+			 */
+			if (data && data->chip) {
+				data->chip->irq_disable(data);
+				data->chip->irq_set_affinity(data, mask, false);
+				data->chip->irq_enable(data);
+				printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu);
+			}
+		}
+		if (!data) {
+			printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu);
+			retval = -EBUSY;
+		}
+	}
+	return retval;
+}
+
+/* must be called with cpucontrol mutex held */
+int __cpu_disable(void)
+{
+	int cpu = smp_processor_id();
+
+	/*
+	 * dont permit boot processor for now
+	 */
+	if (cpu == 0 && !bsp_remove_ok) {
+		printk ("Your platform does not support removal of BSP\n");
+		return (-EBUSY);
+	}
+
+	set_cpu_online(cpu, false);
+
+	if (migrate_platform_irqs(cpu)) {
+		set_cpu_online(cpu, true);
+		return -EBUSY;
+	}
+
+	remove_siblinginfo(cpu);
+	fixup_irqs();
+	local_flush_tlb_all();
+	cpumask_clear_cpu(cpu, &cpu_callin_map);
+	return 0;
+}
+
+void __cpu_die(unsigned int cpu)
+{
+	unsigned int i;
+
+	for (i = 0; i < 100; i++) {
+		/* They ack this in play_dead by setting CPU_DEAD */
+		if (per_cpu(cpu_state, cpu) == CPU_DEAD)
+		{
+			printk ("CPU %d is now offline\n", cpu);
+			return;
+		}
+		msleep(100);
+	}
+ 	printk(KERN_ERR "CPU %u didn't die...\n", cpu);
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+void
+smp_cpus_done (unsigned int dummy)
+{
+	int cpu;
+	unsigned long bogosum = 0;
+
+	/*
+	 * Allow the user to impress friends.
+	 */
+
+	for_each_online_cpu(cpu) {
+		bogosum += cpu_data(cpu)->loops_per_jiffy;
+	}
+
+	printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
+	       (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100);
+}
+
+static inline void set_cpu_sibling_map(int cpu)
+{
+	int i;
+
+	for_each_online_cpu(i) {
+		if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) {
+			cpumask_set_cpu(i, &cpu_core_map[cpu]);
+			cpumask_set_cpu(cpu, &cpu_core_map[i]);
+			if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) {
+				cpumask_set_cpu(i,
+						&per_cpu(cpu_sibling_map, cpu));
+				cpumask_set_cpu(cpu,
+						&per_cpu(cpu_sibling_map, i));
+			}
+		}
+	}
+}
+
+int
+__cpu_up(unsigned int cpu, struct task_struct *tidle)
+{
+	int ret;
+	int sapicid;
+
+	sapicid = ia64_cpu_to_sapicid[cpu];
+	if (sapicid == -1)
+		return -EINVAL;
+
+	/*
+	 * Already booted cpu? not valid anymore since we dont
+	 * do idle loop tightspin anymore.
+	 */
+	if (cpumask_test_cpu(cpu, &cpu_callin_map))
+		return -EINVAL;
+
+	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
+	/* Processor goes to start_secondary(), sets online flag */
+	ret = do_boot_cpu(sapicid, cpu, tidle);
+	if (ret < 0)
+		return ret;
+
+	if (cpu_data(cpu)->threads_per_core == 1 &&
+	    cpu_data(cpu)->cores_per_socket == 1) {
+		cpumask_set_cpu(cpu, &per_cpu(cpu_sibling_map, cpu));
+		cpumask_set_cpu(cpu, &cpu_core_map[cpu]);
+		return 0;
+	}
+
+	set_cpu_sibling_map(cpu);
+
+	return 0;
+}
+
+/*
+ * Assume that CPUs have been discovered by some platform-dependent interface.  For
+ * SoftSDV/Lion, that would be ACPI.
+ *
+ * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP().
+ */
+void __init
+init_smp_config(void)
+{
+	struct fptr {
+		unsigned long fp;
+		unsigned long gp;
+	} *ap_startup;
+	long sal_ret;
+
+	/* Tell SAL where to drop the APs.  */
+	ap_startup = (struct fptr *) start_ap;
+	sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ,
+				       ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0);
+	if (sal_ret < 0)
+		printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n",
+		       ia64_sal_strerror(sal_ret));
+}
+
+/*
+ * identify_siblings(cpu) gets called from identify_cpu. This populates the 
+ * information related to logical execution units in per_cpu_data structure.
+ */
+void identify_siblings(struct cpuinfo_ia64 *c)
+{
+	long status;
+	u16 pltid;
+	pal_logical_to_physical_t info;
+
+	status = ia64_pal_logical_to_phys(-1, &info);
+	if (status != PAL_STATUS_SUCCESS) {
+		if (status != PAL_STATUS_UNIMPLEMENTED) {
+			printk(KERN_ERR
+				"ia64_pal_logical_to_phys failed with %ld\n",
+				status);
+			return;
+		}
+
+		info.overview_ppid = 0;
+		info.overview_cpp  = 1;
+		info.overview_tpc  = 1;
+	}
+
+	status = ia64_sal_physical_id_info(&pltid);
+	if (status != PAL_STATUS_SUCCESS) {
+		if (status != PAL_STATUS_UNIMPLEMENTED)
+			printk(KERN_ERR
+				"ia64_sal_pltid failed with %ld\n",
+				status);
+		return;
+	}
+
+	c->socket_id =  (pltid << 8) | info.overview_ppid;
+
+	if (info.overview_cpp == 1 && info.overview_tpc == 1)
+		return;
+
+	c->cores_per_socket = info.overview_cpp;
+	c->threads_per_core = info.overview_tpc;
+	c->num_log = info.overview_num_log;
+
+	c->core_id = info.log1_cid;
+	c->thread_id = info.log1_tid;
+}
+
+/*
+ * returns non zero, if multi-threading is enabled
+ * on at least one physical package. Due to hotplug cpu
+ * and (maxcpus=), all threads may not necessarily be enabled
+ * even though the processor supports multi-threading.
+ */
+int is_multithreading_enabled(void)
+{
+	int i, j;
+
+	for_each_present_cpu(i) {
+		for_each_present_cpu(j) {
+			if (j == i)
+				continue;
+			if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) {
+				if (cpu_data(j)->core_id == cpu_data(i)->core_id)
+					return 1;
+			}
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(is_multithreading_enabled);
diff --git a/arch/ia64/kernel/stacktrace.c b/arch/ia64/kernel/stacktrace.c
new file mode 100644
index 000000000..6e583a6bd
--- /dev/null
+++ b/arch/ia64/kernel/stacktrace.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/ia64/kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ */
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/module.h>
+
+static void
+ia64_do_save_stack(struct unw_frame_info *info, void *arg)
+{
+	struct stack_trace *trace = arg;
+	unsigned long ip;
+	int skip = trace->skip;
+
+	trace->nr_entries = 0;
+	do {
+		unw_get_ip(info, &ip);
+		if (ip == 0)
+			break;
+		if (skip == 0) {
+			trace->entries[trace->nr_entries++] = ip;
+			if (trace->nr_entries == trace->max_entries)
+				break;
+		} else
+			skip--;
+	} while (unw_unwind(info) >= 0);
+}
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ */
+void save_stack_trace(struct stack_trace *trace)
+{
+	unw_init_running(ia64_do_save_stack, trace);
+}
+EXPORT_SYMBOL(save_stack_trace);
diff --git a/arch/ia64/kernel/sys_ia64.c b/arch/ia64/kernel/sys_ia64.c
new file mode 100644
index 000000000..4f24910cf
--- /dev/null
+++ b/arch/ia64/kernel/sys_ia64.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This file contains various system calls that have different calling
+ * conventions on different platforms.
+ *
+ * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/sched.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/task_stack.h>
+#include <linux/shm.h>
+#include <linux/file.h>		/* doh, must come after sched.h... */
+#include <linux/smp.h>
+#include <linux/syscalls.h>
+#include <linux/highuid.h>
+#include <linux/hugetlb.h>
+
+#include <asm/shmparam.h>
+#include <linux/uaccess.h>
+
+unsigned long
+arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
+			unsigned long pgoff, unsigned long flags)
+{
+	long map_shared = (flags & MAP_SHARED);
+	unsigned long align_mask = 0;
+	struct mm_struct *mm = current->mm;
+	struct vm_unmapped_area_info info;
+
+	if (len > RGN_MAP_LIMIT)
+		return -ENOMEM;
+
+	/* handle fixed mapping: prevent overlap with huge pages */
+	if (flags & MAP_FIXED) {
+		if (is_hugepage_only_range(mm, addr, len))
+			return -EINVAL;
+		return addr;
+	}
+
+#ifdef CONFIG_HUGETLB_PAGE
+	if (REGION_NUMBER(addr) == RGN_HPAGE)
+		addr = 0;
+#endif
+	if (!addr)
+		addr = TASK_UNMAPPED_BASE;
+
+	if (map_shared && (TASK_SIZE > 0xfffffffful))
+		/*
+		 * For 64-bit tasks, align shared segments to 1MB to avoid potential
+		 * performance penalty due to virtual aliasing (see ASDM).  For 32-bit
+		 * tasks, we prefer to avoid exhausting the address space too quickly by
+		 * limiting alignment to a single page.
+		 */
+		align_mask = PAGE_MASK & (SHMLBA - 1);
+
+	info.flags = 0;
+	info.length = len;
+	info.low_limit = addr;
+	info.high_limit = TASK_SIZE;
+	info.align_mask = align_mask;
+	info.align_offset = 0;
+	return vm_unmapped_area(&info);
+}
+
+asmlinkage long
+ia64_getpriority (int which, int who)
+{
+	long prio;
+
+	prio = sys_getpriority(which, who);
+	if (prio >= 0) {
+		force_successful_syscall_return();
+		prio = 20 - prio;
+	}
+	return prio;
+}
+
+/* XXX obsolete, but leave it here until the old libc is gone... */
+asmlinkage unsigned long
+sys_getpagesize (void)
+{
+	return PAGE_SIZE;
+}
+
+asmlinkage unsigned long
+ia64_brk (unsigned long brk)
+{
+	unsigned long retval = sys_brk(brk);
+	force_successful_syscall_return();
+	return retval;
+}
+
+/*
+ * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
+ * and r9) as this is faster than doing a copy_to_user().
+ */
+asmlinkage long
+sys_ia64_pipe (void)
+{
+	struct pt_regs *regs = task_pt_regs(current);
+	int fd[2];
+	int retval;
+
+	retval = do_pipe_flags(fd, 0);
+	if (retval)
+		goto out;
+	retval = fd[0];
+	regs->r9 = fd[1];
+  out:
+	return retval;
+}
+
+int ia64_mmap_check(unsigned long addr, unsigned long len,
+		unsigned long flags)
+{
+	unsigned long roff;
+
+	/*
+	 * Don't permit mappings into unmapped space, the virtual page table
+	 * of a region, or across a region boundary.  Note: RGN_MAP_LIMIT is
+	 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
+	 */
+	roff = REGION_OFFSET(addr);
+	if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
+		return -EINVAL;
+	return 0;
+}
+
+/*
+ * mmap2() is like mmap() except that the offset is expressed in units
+ * of PAGE_SIZE (instead of bytes).  This allows to mmap2() (pieces
+ * of) files that are larger than the address space of the CPU.
+ */
+asmlinkage unsigned long
+sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
+{
+	addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
+	if (!IS_ERR((void *) addr))
+		force_successful_syscall_return();
+	return addr;
+}
+
+asmlinkage unsigned long
+sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
+{
+	if (offset_in_page(off) != 0)
+		return -EINVAL;
+
+	addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
+	if (!IS_ERR((void *) addr))
+		force_successful_syscall_return();
+	return addr;
+}
+
+asmlinkage unsigned long
+ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
+	     unsigned long new_addr)
+{
+	addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
+	if (!IS_ERR((void *) addr))
+		force_successful_syscall_return();
+	return addr;
+}
+
+asmlinkage long
+ia64_clock_getres(const clockid_t which_clock, struct __kernel_timespec __user *tp)
+{
+	struct timespec64 rtn_tp;
+	s64 tick_ns;
+
+	/*
+	 * ia64's clock_gettime() syscall is implemented as a vdso call
+	 * fsys_clock_gettime(). Currently it handles only
+	 * CLOCK_REALTIME and CLOCK_MONOTONIC. Both are based on
+	 * 'ar.itc' counter which gets incremented at a constant
+	 * frequency. It's usually 400MHz, ~2.5x times slower than CPU
+	 * clock frequency. Which is almost a 1ns hrtimer, but not quite.
+	 *
+	 * Let's special-case these timers to report correct precision
+	 * based on ITC frequency and not HZ frequency for supported
+	 * clocks.
+	 */
+	switch (which_clock) {
+	case CLOCK_REALTIME:
+	case CLOCK_MONOTONIC:
+		tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, local_cpu_data->itc_freq);
+		rtn_tp = ns_to_timespec64(tick_ns);
+		return put_timespec64(&rtn_tp, tp);
+	}
+
+	return sys_clock_getres(which_clock, tp);
+}
diff --git a/arch/ia64/kernel/syscalls/Makefile b/arch/ia64/kernel/syscalls/Makefile
new file mode 100644
index 000000000..d009f927a
--- /dev/null
+++ b/arch/ia64/kernel/syscalls/Makefile
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0
+kapi := arch/$(SRCARCH)/include/generated/asm
+uapi := arch/$(SRCARCH)/include/generated/uapi/asm
+
+$(shell mkdir -p $(uapi) $(kapi))
+
+syscall := $(src)/syscall.tbl
+syshdr := $(srctree)/scripts/syscallhdr.sh
+systbl := $(srctree)/scripts/syscalltbl.sh
+
+quiet_cmd_syshdr = SYSHDR  $@
+      cmd_syshdr = $(CONFIG_SHELL) $(syshdr) --emit-nr --offset __NR_Linux $< $@
+
+quiet_cmd_systbl = SYSTBL  $@
+      cmd_systbl = $(CONFIG_SHELL) $(systbl) $< $@
+
+$(uapi)/unistd_64.h: $(syscall) $(syshdr) FORCE
+	$(call if_changed,syshdr)
+
+$(kapi)/syscall_table.h: $(syscall) $(systbl) FORCE
+	$(call if_changed,systbl)
+
+uapisyshdr-y		+= unistd_64.h
+kapisyshdr-y		+= syscall_table.h
+
+uapisyshdr-y	:= $(addprefix $(uapi)/, $(uapisyshdr-y))
+kapisyshdr-y	:= $(addprefix $(kapi)/, $(kapisyshdr-y))
+targets		+= $(addprefix ../../../../, $(uapisyshdr-y) $(kapisyshdr-y))
+
+PHONY += all
+all: $(uapisyshdr-y) $(kapisyshdr-y)
+	@:
diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
new file mode 100644
index 000000000..72c929d99
--- /dev/null
+++ b/arch/ia64/kernel/syscalls/syscall.tbl
@@ -0,0 +1,373 @@
+# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
+#
+# Linux system call numbers and entry vectors for ia64
+#
+# The format is:
+# <number> <abi> <name> <entry point>
+#
+# Add 1024 to <number> will get the actual system call number
+#
+# The <abi> is always "common" for this file
+#
+0	common	ni_syscall			sys_ni_syscall
+1	common	exit				sys_exit
+2	common	read				sys_read
+3	common	write				sys_write
+4	common	open				sys_open
+5	common	close				sys_close
+6	common	creat				sys_creat
+7	common	link				sys_link
+8	common	unlink				sys_unlink
+9	common	execve				ia64_execve
+10	common	chdir				sys_chdir
+11	common	fchdir				sys_fchdir
+12	common	utimes				sys_utimes
+13	common	mknod				sys_mknod
+14	common	chmod				sys_chmod
+15	common	chown				sys_chown
+16	common	lseek				sys_lseek
+17	common	getpid				sys_getpid
+18	common	getppid				sys_getppid
+19	common	mount				sys_mount
+20	common	umount2				sys_umount
+21	common	setuid				sys_setuid
+22	common	getuid				sys_getuid
+23	common	geteuid				sys_geteuid
+24	common	ptrace				sys_ptrace
+25	common	access				sys_access
+26	common	sync				sys_sync
+27	common	fsync				sys_fsync
+28	common	fdatasync			sys_fdatasync
+29	common	kill				sys_kill
+30	common	rename				sys_rename
+31	common	mkdir				sys_mkdir
+32	common	rmdir				sys_rmdir
+33	common	dup				sys_dup
+34	common	pipe				sys_ia64_pipe
+35	common	times				sys_times
+36	common	brk				ia64_brk
+37	common	setgid				sys_setgid
+38	common	getgid				sys_getgid
+39	common	getegid				sys_getegid
+40	common	acct				sys_acct
+41	common	ioctl				sys_ioctl
+42	common	fcntl				sys_fcntl
+43	common	umask				sys_umask
+44	common	chroot				sys_chroot
+45	common	ustat				sys_ustat
+46	common	dup2				sys_dup2
+47	common	setreuid			sys_setreuid
+48	common	setregid			sys_setregid
+49	common	getresuid			sys_getresuid
+50	common	setresuid			sys_setresuid
+51	common	getresgid			sys_getresgid
+52	common	setresgid			sys_setresgid
+53	common	getgroups			sys_getgroups
+54	common	setgroups			sys_setgroups
+55	common	getpgid				sys_getpgid
+56	common	setpgid				sys_setpgid
+57	common	setsid				sys_setsid
+58	common	getsid				sys_getsid
+59	common	sethostname			sys_sethostname
+60	common	setrlimit			sys_setrlimit
+61	common	getrlimit			sys_getrlimit
+62	common	getrusage			sys_getrusage
+63	common	gettimeofday			sys_gettimeofday
+64	common	settimeofday			sys_settimeofday
+65	common	select				sys_select
+66	common	poll				sys_poll
+67	common	symlink				sys_symlink
+68	common	readlink			sys_readlink
+69	common	uselib				sys_uselib
+70	common	swapon				sys_swapon
+71	common	swapoff				sys_swapoff
+72	common	reboot				sys_reboot
+73	common	truncate			sys_truncate
+74	common	ftruncate			sys_ftruncate
+75	common	fchmod				sys_fchmod
+76	common	fchown				sys_fchown
+77	common	getpriority			ia64_getpriority
+78	common	setpriority			sys_setpriority
+79	common	statfs				sys_statfs
+80	common	fstatfs				sys_fstatfs
+81	common	gettid				sys_gettid
+82	common	semget				sys_semget
+83	common	semop				sys_semop
+84	common	semctl				sys_semctl
+85	common	msgget				sys_msgget
+86	common	msgsnd				sys_msgsnd
+87	common	msgrcv				sys_msgrcv
+88	common	msgctl				sys_msgctl
+89	common	shmget				sys_shmget
+90	common	shmat				sys_shmat
+91	common	shmdt				sys_shmdt
+92	common	shmctl				sys_shmctl
+93	common	syslog				sys_syslog
+94	common	setitimer			sys_setitimer
+95	common	getitimer			sys_getitimer
+# 1120 was old_stat
+# 1121 was old_lstat
+# 1122 was old_fstat
+99	common	vhangup				sys_vhangup
+100	common	lchown				sys_lchown
+101	common	remap_file_pages		sys_remap_file_pages
+102	common	wait4				sys_wait4
+103	common	sysinfo				sys_sysinfo
+104	common	clone				sys_clone
+105	common	setdomainname			sys_setdomainname
+106	common	uname				sys_newuname
+107	common	adjtimex			sys_adjtimex
+# 1132 was create_module
+109	common	init_module			sys_init_module
+110	common	delete_module			sys_delete_module
+# 1135 was get_kernel_syms
+# 1136 was query_module
+113	common	quotactl			sys_quotactl
+114	common	bdflush				sys_ni_syscall
+115	common	sysfs				sys_sysfs
+116	common	personality			sys_personality
+117	common	afs_syscall			sys_ni_syscall
+118	common	setfsuid			sys_setfsuid
+119	common	setfsgid			sys_setfsgid
+120	common	getdents			sys_getdents
+121	common	flock				sys_flock
+122	common	readv				sys_readv
+123	common	writev				sys_writev
+124	common	pread64				sys_pread64
+125	common	pwrite64			sys_pwrite64
+126	common	_sysctl				sys_ni_syscall
+127	common	mmap				sys_mmap
+128	common	munmap				sys_munmap
+129	common	mlock				sys_mlock
+130	common	mlockall			sys_mlockall
+131	common	mprotect			sys_mprotect
+132	common	mremap				ia64_mremap
+133	common	msync				sys_msync
+134	common	munlock				sys_munlock
+135	common	munlockall			sys_munlockall
+136	common	sched_getparam			sys_sched_getparam
+137	common	sched_setparam			sys_sched_setparam
+138	common	sched_getscheduler		sys_sched_getscheduler
+139	common	sched_setscheduler		sys_sched_setscheduler
+140	common	sched_yield			sys_sched_yield
+141	common	sched_get_priority_max		sys_sched_get_priority_max
+142	common	sched_get_priority_min		sys_sched_get_priority_min
+143	common	sched_rr_get_interval		sys_sched_rr_get_interval
+144	common	nanosleep			sys_nanosleep
+145	common	nfsservctl			sys_ni_syscall
+146	common	prctl				sys_prctl
+147	common	old_getpagesize			sys_getpagesize
+148	common	mmap2				sys_mmap2
+149	common	pciconfig_read			sys_pciconfig_read
+150	common	pciconfig_write			sys_pciconfig_write
+151	common	perfmonctl			sys_ni_syscall
+152	common	sigaltstack			sys_sigaltstack
+153	common	rt_sigaction			sys_rt_sigaction
+154	common	rt_sigpending			sys_rt_sigpending
+155	common	rt_sigprocmask			sys_rt_sigprocmask
+156	common	rt_sigqueueinfo			sys_rt_sigqueueinfo
+157	common	rt_sigreturn			sys_rt_sigreturn
+158	common	rt_sigsuspend			sys_rt_sigsuspend
+159	common	rt_sigtimedwait			sys_rt_sigtimedwait
+160	common	getcwd				sys_getcwd
+161	common	capget				sys_capget
+162	common	capset				sys_capset
+163	common	sendfile			sys_sendfile64
+164	common	getpmsg				sys_ni_syscall
+165	common	putpmsg				sys_ni_syscall
+166	common	socket				sys_socket
+167	common	bind				sys_bind
+168	common	connect				sys_connect
+169	common	listen				sys_listen
+170	common	accept				sys_accept
+171	common	getsockname			sys_getsockname
+172	common	getpeername			sys_getpeername
+173	common	socketpair			sys_socketpair
+174	common	send				sys_send
+175	common	sendto				sys_sendto
+176	common	recv				sys_recv
+177	common	recvfrom			sys_recvfrom
+178	common	shutdown			sys_shutdown
+179	common	setsockopt			sys_setsockopt
+180	common	getsockopt			sys_getsockopt
+181	common	sendmsg				sys_sendmsg
+182	common	recvmsg				sys_recvmsg
+183	common	pivot_root			sys_pivot_root
+184	common	mincore				sys_mincore
+185	common	madvise				sys_madvise
+186	common	stat				sys_newstat
+187	common	lstat				sys_newlstat
+188	common	fstat				sys_newfstat
+189	common	clone2				sys_clone2
+190	common	getdents64			sys_getdents64
+191	common	getunwind			sys_getunwind
+192	common	readahead			sys_readahead
+193	common	setxattr			sys_setxattr
+194	common	lsetxattr			sys_lsetxattr
+195	common	fsetxattr			sys_fsetxattr
+196	common	getxattr			sys_getxattr
+197	common	lgetxattr			sys_lgetxattr
+198	common	fgetxattr			sys_fgetxattr
+199	common	listxattr			sys_listxattr
+200	common	llistxattr			sys_llistxattr
+201	common	flistxattr			sys_flistxattr
+202	common	removexattr			sys_removexattr
+203	common	lremovexattr			sys_lremovexattr
+204	common	fremovexattr			sys_fremovexattr
+205	common	tkill				sys_tkill
+206	common	futex				sys_futex
+207	common	sched_setaffinity		sys_sched_setaffinity
+208	common	sched_getaffinity		sys_sched_getaffinity
+209	common	set_tid_address			sys_set_tid_address
+210	common	fadvise64			sys_fadvise64_64
+211	common	tgkill				sys_tgkill
+212	common	exit_group			sys_exit_group
+213	common	lookup_dcookie			sys_lookup_dcookie
+214	common	io_setup			sys_io_setup
+215	common	io_destroy			sys_io_destroy
+216	common	io_getevents			sys_io_getevents
+217	common	io_submit			sys_io_submit
+218	common	io_cancel			sys_io_cancel
+219	common	epoll_create			sys_epoll_create
+220	common	epoll_ctl			sys_epoll_ctl
+221	common	epoll_wait			sys_epoll_wait
+222	common	restart_syscall			sys_restart_syscall
+223	common	semtimedop			sys_semtimedop
+224	common	timer_create			sys_timer_create
+225	common	timer_settime			sys_timer_settime
+226	common	timer_gettime			sys_timer_gettime
+227	common	timer_getoverrun		sys_timer_getoverrun
+228	common	timer_delete			sys_timer_delete
+229	common	clock_settime			sys_clock_settime
+230	common	clock_gettime			sys_clock_gettime
+231	common	clock_getres			ia64_clock_getres
+232	common	clock_nanosleep			sys_clock_nanosleep
+233	common	fstatfs64			sys_fstatfs64
+234	common	statfs64			sys_statfs64
+235	common	mbind				sys_mbind
+236	common	get_mempolicy			sys_get_mempolicy
+237	common	set_mempolicy			sys_set_mempolicy
+238	common	mq_open				sys_mq_open
+239	common	mq_unlink			sys_mq_unlink
+240	common	mq_timedsend			sys_mq_timedsend
+241	common	mq_timedreceive			sys_mq_timedreceive
+242	common	mq_notify			sys_mq_notify
+243	common	mq_getsetattr			sys_mq_getsetattr
+244	common	kexec_load			sys_kexec_load
+245	common	vserver				sys_ni_syscall
+246	common	waitid				sys_waitid
+247	common	add_key				sys_add_key
+248	common	request_key			sys_request_key
+249	common	keyctl				sys_keyctl
+250	common	ioprio_set			sys_ioprio_set
+251	common	ioprio_get			sys_ioprio_get
+252	common	move_pages			sys_move_pages
+253	common	inotify_init			sys_inotify_init
+254	common	inotify_add_watch		sys_inotify_add_watch
+255	common	inotify_rm_watch		sys_inotify_rm_watch
+256	common	migrate_pages			sys_migrate_pages
+257	common	openat				sys_openat
+258	common	mkdirat				sys_mkdirat
+259	common	mknodat				sys_mknodat
+260	common	fchownat			sys_fchownat
+261	common	futimesat			sys_futimesat
+262	common	newfstatat			sys_newfstatat
+263	common	unlinkat			sys_unlinkat
+264	common	renameat			sys_renameat
+265	common	linkat				sys_linkat
+266	common	symlinkat			sys_symlinkat
+267	common	readlinkat			sys_readlinkat
+268	common	fchmodat			sys_fchmodat
+269	common	faccessat			sys_faccessat
+270	common	pselect6			sys_pselect6
+271	common	ppoll				sys_ppoll
+272	common	unshare				sys_unshare
+273	common	splice				sys_splice
+274	common	set_robust_list			sys_set_robust_list
+275	common	get_robust_list			sys_get_robust_list
+276	common	sync_file_range			sys_sync_file_range
+277	common	tee				sys_tee
+278	common	vmsplice			sys_vmsplice
+279	common	fallocate			sys_fallocate
+280	common	getcpu				sys_getcpu
+281	common	epoll_pwait			sys_epoll_pwait
+282	common	utimensat			sys_utimensat
+283	common	signalfd			sys_signalfd
+284	common	timerfd				sys_ni_syscall
+285	common	eventfd				sys_eventfd
+286	common	timerfd_create			sys_timerfd_create
+287	common	timerfd_settime			sys_timerfd_settime
+288	common	timerfd_gettime			sys_timerfd_gettime
+289	common	signalfd4			sys_signalfd4
+290	common	eventfd2			sys_eventfd2
+291	common	epoll_create1			sys_epoll_create1
+292	common	dup3				sys_dup3
+293	common	pipe2				sys_pipe2
+294	common	inotify_init1			sys_inotify_init1
+295	common	preadv				sys_preadv
+296	common	pwritev				sys_pwritev
+297	common	rt_tgsigqueueinfo		sys_rt_tgsigqueueinfo
+298	common	recvmmsg			sys_recvmmsg
+299	common	fanotify_init			sys_fanotify_init
+300	common	fanotify_mark			sys_fanotify_mark
+301	common	prlimit64			sys_prlimit64
+302	common	name_to_handle_at		sys_name_to_handle_at
+303	common	open_by_handle_at		sys_open_by_handle_at
+304	common	clock_adjtime			sys_clock_adjtime
+305	common	syncfs				sys_syncfs
+306	common	setns				sys_setns
+307	common	sendmmsg			sys_sendmmsg
+308	common	process_vm_readv		sys_process_vm_readv
+309	common	process_vm_writev		sys_process_vm_writev
+310	common	accept4				sys_accept4
+311	common	finit_module			sys_finit_module
+312	common	sched_setattr			sys_sched_setattr
+313	common	sched_getattr			sys_sched_getattr
+314	common	renameat2			sys_renameat2
+315	common	getrandom			sys_getrandom
+316	common	memfd_create			sys_memfd_create
+317	common	bpf				sys_bpf
+318	common	execveat			sys_execveat
+319	common	userfaultfd			sys_userfaultfd
+320	common	membarrier			sys_membarrier
+321	common	kcmp				sys_kcmp
+322	common	mlock2				sys_mlock2
+323	common	copy_file_range			sys_copy_file_range
+324	common	preadv2				sys_preadv2
+325	common	pwritev2			sys_pwritev2
+326	common	statx				sys_statx
+327	common	io_pgetevents			sys_io_pgetevents
+328	common	perf_event_open			sys_perf_event_open
+329	common	seccomp				sys_seccomp
+330	common	pkey_mprotect			sys_pkey_mprotect
+331	common	pkey_alloc			sys_pkey_alloc
+332	common	pkey_free			sys_pkey_free
+333	common	rseq				sys_rseq
+# 334 through 423 are reserved to sync up with other architectures
+424	common	pidfd_send_signal		sys_pidfd_send_signal
+425	common	io_uring_setup			sys_io_uring_setup
+426	common	io_uring_enter			sys_io_uring_enter
+427	common	io_uring_register		sys_io_uring_register
+428	common	open_tree			sys_open_tree
+429	common	move_mount			sys_move_mount
+430	common	fsopen				sys_fsopen
+431	common	fsconfig			sys_fsconfig
+432	common	fsmount				sys_fsmount
+433	common	fspick				sys_fspick
+434	common	pidfd_open			sys_pidfd_open
+# 435 reserved for clone3
+436	common	close_range			sys_close_range
+437	common	openat2				sys_openat2
+438	common	pidfd_getfd			sys_pidfd_getfd
+439	common	faccessat2			sys_faccessat2
+440	common	process_madvise			sys_process_madvise
+441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_fd			sys_quotactl_fd
+444	common	landlock_create_ruleset		sys_landlock_create_ruleset
+445	common	landlock_add_rule		sys_landlock_add_rule
+446	common	landlock_restrict_self		sys_landlock_restrict_self
+# 447 reserved for memfd_secret
+448	common	process_mrelease		sys_process_mrelease
+449	common  futex_waitv                     sys_futex_waitv
+450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
new file mode 100644
index 000000000..fa9c0ab8c
--- /dev/null
+++ b/arch/ia64/kernel/time.c
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/arch/ia64/kernel/time.c
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ *	David Mosberger <davidm@hpl.hp.com>
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ * Copyright (C) 1999-2000 VA Linux Systems
+ * Copyright (C) 1999-2000 Walt Drummond <drummond@valinux.com>
+ */
+
+#include <linux/cpu.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/profile.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/nmi.h>
+#include <linux/interrupt.h>
+#include <linux/efi.h>
+#include <linux/timex.h>
+#include <linux/timekeeper_internal.h>
+#include <linux/platform_device.h>
+#include <linux/sched/cputime.h>
+
+#include <asm/delay.h>
+#include <asm/efi.h>
+#include <asm/hw_irq.h>
+#include <asm/ptrace.h>
+#include <asm/sal.h>
+#include <asm/sections.h>
+
+#include "fsyscall_gtod_data.h"
+#include "irq.h"
+
+static u64 itc_get_cycles(struct clocksource *cs);
+
+struct fsyscall_gtod_data_t fsyscall_gtod_data;
+
+struct itc_jitter_data_t itc_jitter_data;
+
+volatile int time_keeper_id = 0; /* smp_processor_id() of time-keeper */
+
+#ifdef CONFIG_IA64_DEBUG_IRQ
+
+unsigned long last_cli_ip;
+EXPORT_SYMBOL(last_cli_ip);
+
+#endif
+
+static struct clocksource clocksource_itc = {
+	.name           = "itc",
+	.rating         = 350,
+	.read           = itc_get_cycles,
+	.mask           = CLOCKSOURCE_MASK(64),
+	.flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+static struct clocksource *itc_clocksource;
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+
+#include <linux/kernel_stat.h>
+
+extern u64 cycle_to_nsec(u64 cyc);
+
+void vtime_flush(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+	u64 delta;
+
+	if (ti->utime)
+		account_user_time(tsk, cycle_to_nsec(ti->utime));
+
+	if (ti->gtime)
+		account_guest_time(tsk, cycle_to_nsec(ti->gtime));
+
+	if (ti->idle_time)
+		account_idle_time(cycle_to_nsec(ti->idle_time));
+
+	if (ti->stime) {
+		delta = cycle_to_nsec(ti->stime);
+		account_system_index_time(tsk, delta, CPUTIME_SYSTEM);
+	}
+
+	if (ti->hardirq_time) {
+		delta = cycle_to_nsec(ti->hardirq_time);
+		account_system_index_time(tsk, delta, CPUTIME_IRQ);
+	}
+
+	if (ti->softirq_time) {
+		delta = cycle_to_nsec(ti->softirq_time);
+		account_system_index_time(tsk, delta, CPUTIME_SOFTIRQ);
+	}
+
+	ti->utime = 0;
+	ti->gtime = 0;
+	ti->idle_time = 0;
+	ti->stime = 0;
+	ti->hardirq_time = 0;
+	ti->softirq_time = 0;
+}
+
+/*
+ * Called from the context switch with interrupts disabled, to charge all
+ * accumulated times to the current process, and to prepare accounting on
+ * the next process.
+ */
+void arch_vtime_task_switch(struct task_struct *prev)
+{
+	struct thread_info *pi = task_thread_info(prev);
+	struct thread_info *ni = task_thread_info(current);
+
+	ni->ac_stamp = pi->ac_stamp;
+	ni->ac_stime = ni->ac_utime = 0;
+}
+
+/*
+ * Account time for a transition between system, hard irq or soft irq state.
+ * Note that this function is called with interrupts enabled.
+ */
+static __u64 vtime_delta(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+	__u64 now, delta_stime;
+
+	WARN_ON_ONCE(!irqs_disabled());
+
+	now = ia64_get_itc();
+	delta_stime = now - ti->ac_stamp;
+	ti->ac_stamp = now;
+
+	return delta_stime;
+}
+
+void vtime_account_kernel(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+	__u64 stime = vtime_delta(tsk);
+
+	if (tsk->flags & PF_VCPU)
+		ti->gtime += stime;
+	else
+		ti->stime += stime;
+}
+EXPORT_SYMBOL_GPL(vtime_account_kernel);
+
+void vtime_account_idle(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+
+	ti->idle_time += vtime_delta(tsk);
+}
+
+void vtime_account_softirq(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+
+	ti->softirq_time += vtime_delta(tsk);
+}
+
+void vtime_account_hardirq(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+
+	ti->hardirq_time += vtime_delta(tsk);
+}
+
+#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
+
+static irqreturn_t
+timer_interrupt (int irq, void *dev_id)
+{
+	unsigned long new_itm;
+
+	if (cpu_is_offline(smp_processor_id())) {
+		return IRQ_HANDLED;
+	}
+
+	new_itm = local_cpu_data->itm_next;
+
+	if (!time_after(ia64_get_itc(), new_itm))
+		printk(KERN_ERR "Oops: timer tick before it's due (itc=%lx,itm=%lx)\n",
+		       ia64_get_itc(), new_itm);
+
+	while (1) {
+		new_itm += local_cpu_data->itm_delta;
+
+		legacy_timer_tick(smp_processor_id() == time_keeper_id);
+
+		local_cpu_data->itm_next = new_itm;
+
+		if (time_after(new_itm, ia64_get_itc()))
+			break;
+
+		/*
+		 * Allow IPIs to interrupt the timer loop.
+		 */
+		local_irq_enable();
+		local_irq_disable();
+	}
+
+	do {
+		/*
+		 * If we're too close to the next clock tick for
+		 * comfort, we increase the safety margin by
+		 * intentionally dropping the next tick(s).  We do NOT
+		 * update itm.next because that would force us to call
+		 * xtime_update() which in turn would let our clock run
+		 * too fast (with the potentially devastating effect
+		 * of losing monotony of time).
+		 */
+		while (!time_after(new_itm, ia64_get_itc() + local_cpu_data->itm_delta/2))
+			new_itm += local_cpu_data->itm_delta;
+		ia64_set_itm(new_itm);
+		/* double check, in case we got hit by a (slow) PMI: */
+	} while (time_after_eq(ia64_get_itc(), new_itm));
+	return IRQ_HANDLED;
+}
+
+/*
+ * Encapsulate access to the itm structure for SMP.
+ */
+void
+ia64_cpu_local_tick (void)
+{
+	int cpu = smp_processor_id();
+	unsigned long shift = 0, delta;
+
+	/* arrange for the cycle counter to generate a timer interrupt: */
+	ia64_set_itv(IA64_TIMER_VECTOR);
+
+	delta = local_cpu_data->itm_delta;
+	/*
+	 * Stagger the timer tick for each CPU so they don't occur all at (almost) the
+	 * same time:
+	 */
+	if (cpu) {
+		unsigned long hi = 1UL << ia64_fls(cpu);
+		shift = (2*(cpu - hi) + 1) * delta/hi/2;
+	}
+	local_cpu_data->itm_next = ia64_get_itc() + delta + shift;
+	ia64_set_itm(local_cpu_data->itm_next);
+}
+
+static int nojitter;
+
+static int __init nojitter_setup(char *str)
+{
+	nojitter = 1;
+	printk("Jitter checking for ITC timers disabled\n");
+	return 1;
+}
+
+__setup("nojitter", nojitter_setup);
+
+
+void ia64_init_itm(void)
+{
+	unsigned long platform_base_freq, itc_freq;
+	struct pal_freq_ratio itc_ratio, proc_ratio;
+	long status, platform_base_drift, itc_drift;
+
+	/*
+	 * According to SAL v2.6, we need to use a SAL call to determine the platform base
+	 * frequency and then a PAL call to determine the frequency ratio between the ITC
+	 * and the base frequency.
+	 */
+	status = ia64_sal_freq_base(SAL_FREQ_BASE_PLATFORM,
+				    &platform_base_freq, &platform_base_drift);
+	if (status != 0) {
+		printk(KERN_ERR "SAL_FREQ_BASE_PLATFORM failed: %s\n", ia64_sal_strerror(status));
+	} else {
+		status = ia64_pal_freq_ratios(&proc_ratio, NULL, &itc_ratio);
+		if (status != 0)
+			printk(KERN_ERR "PAL_FREQ_RATIOS failed with status=%ld\n", status);
+	}
+	if (status != 0) {
+		/* invent "random" values */
+		printk(KERN_ERR
+		       "SAL/PAL failed to obtain frequency info---inventing reasonable values\n");
+		platform_base_freq = 100000000;
+		platform_base_drift = -1;	/* no drift info */
+		itc_ratio.num = 3;
+		itc_ratio.den = 1;
+	}
+	if (platform_base_freq < 40000000) {
+		printk(KERN_ERR "Platform base frequency %lu bogus---resetting to 75MHz!\n",
+		       platform_base_freq);
+		platform_base_freq = 75000000;
+		platform_base_drift = -1;
+	}
+	if (!proc_ratio.den)
+		proc_ratio.den = 1;	/* avoid division by zero */
+	if (!itc_ratio.den)
+		itc_ratio.den = 1;	/* avoid division by zero */
+
+	itc_freq = (platform_base_freq*itc_ratio.num)/itc_ratio.den;
+
+	local_cpu_data->itm_delta = (itc_freq + HZ/2) / HZ;
+	printk(KERN_DEBUG "CPU %d: base freq=%lu.%03luMHz, ITC ratio=%u/%u, "
+	       "ITC freq=%lu.%03luMHz", smp_processor_id(),
+	       platform_base_freq / 1000000, (platform_base_freq / 1000) % 1000,
+	       itc_ratio.num, itc_ratio.den, itc_freq / 1000000, (itc_freq / 1000) % 1000);
+
+	if (platform_base_drift != -1) {
+		itc_drift = platform_base_drift*itc_ratio.num/itc_ratio.den;
+		printk("+/-%ldppm\n", itc_drift);
+	} else {
+		itc_drift = -1;
+		printk("\n");
+	}
+
+	local_cpu_data->proc_freq = (platform_base_freq*proc_ratio.num)/proc_ratio.den;
+	local_cpu_data->itc_freq = itc_freq;
+	local_cpu_data->cyc_per_usec = (itc_freq + USEC_PER_SEC/2) / USEC_PER_SEC;
+	local_cpu_data->nsec_per_cyc = ((NSEC_PER_SEC<<IA64_NSEC_PER_CYC_SHIFT)
+					+ itc_freq/2)/itc_freq;
+
+	if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) {
+#ifdef CONFIG_SMP
+		/* On IA64 in an SMP configuration ITCs are never accurately synchronized.
+		 * Jitter compensation requires a cmpxchg which may limit
+		 * the scalability of the syscalls for retrieving time.
+		 * The ITC synchronization is usually successful to within a few
+		 * ITC ticks but this is not a sure thing. If you need to improve
+		 * timer performance in SMP situations then boot the kernel with the
+		 * "nojitter" option. However, doing so may result in time fluctuating (maybe
+		 * even going backward) if the ITC offsets between the individual CPUs
+		 * are too large.
+		 */
+		if (!nojitter)
+			itc_jitter_data.itc_jitter = 1;
+#endif
+	} else
+		/*
+		 * ITC is drifty and we have not synchronized the ITCs in smpboot.c.
+		 * ITC values may fluctuate significantly between processors.
+		 * Clock should not be used for hrtimers. Mark itc as only
+		 * useful for boot and testing.
+		 *
+		 * Note that jitter compensation is off! There is no point of
+		 * synchronizing ITCs since they may be large differentials
+		 * that change over time.
+		 *
+		 * The only way to fix this would be to repeatedly sync the
+		 * ITCs. Until that time we have to avoid ITC.
+		 */
+		clocksource_itc.rating = 50;
+
+	/* avoid softlock up message when cpu is unplug and plugged again. */
+	touch_softlockup_watchdog();
+
+	/* Setup the CPU local timer tick */
+	ia64_cpu_local_tick();
+
+	if (!itc_clocksource) {
+		clocksource_register_hz(&clocksource_itc,
+						local_cpu_data->itc_freq);
+		itc_clocksource = &clocksource_itc;
+	}
+}
+
+static u64 itc_get_cycles(struct clocksource *cs)
+{
+	unsigned long lcycle, now, ret;
+
+	if (!itc_jitter_data.itc_jitter)
+		return get_cycles();
+
+	lcycle = itc_jitter_data.itc_lastcycle;
+	now = get_cycles();
+	if (lcycle && time_after(lcycle, now))
+		return lcycle;
+
+	/*
+	 * Keep track of the last timer value returned.
+	 * In an SMP environment, you could lose out in contention of
+	 * cmpxchg. If so, your cmpxchg returns new value which the
+	 * winner of contention updated to. Use the new value instead.
+	 */
+	ret = cmpxchg(&itc_jitter_data.itc_lastcycle, lcycle, now);
+	if (unlikely(ret != lcycle))
+		return ret;
+
+	return now;
+}
+
+void read_persistent_clock64(struct timespec64 *ts)
+{
+	efi_gettimeofday(ts);
+}
+
+void __init
+time_init (void)
+{
+	register_percpu_irq(IA64_TIMER_VECTOR, timer_interrupt, IRQF_IRQPOLL,
+			    "timer");
+	ia64_init_itm();
+}
+
+/*
+ * Generic udelay assumes that if preemption is allowed and the thread
+ * migrates to another CPU, that the ITC values are synchronized across
+ * all CPUs.
+ */
+static void
+ia64_itc_udelay (unsigned long usecs)
+{
+	unsigned long start = ia64_get_itc();
+	unsigned long end = start + usecs*local_cpu_data->cyc_per_usec;
+
+	while (time_before(ia64_get_itc(), end))
+		cpu_relax();
+}
+
+void (*ia64_udelay)(unsigned long usecs) = &ia64_itc_udelay;
+
+void
+udelay (unsigned long usecs)
+{
+	(*ia64_udelay)(usecs);
+}
+EXPORT_SYMBOL(udelay);
+
+/* IA64 doesn't cache the timezone */
+void update_vsyscall_tz(void)
+{
+}
+
+void update_vsyscall(struct timekeeper *tk)
+{
+	write_seqcount_begin(&fsyscall_gtod_data.seq);
+
+	/* copy vsyscall data */
+	fsyscall_gtod_data.clk_mask = tk->tkr_mono.mask;
+	fsyscall_gtod_data.clk_mult = tk->tkr_mono.mult;
+	fsyscall_gtod_data.clk_shift = tk->tkr_mono.shift;
+	fsyscall_gtod_data.clk_fsys_mmio = tk->tkr_mono.clock->archdata.fsys_mmio;
+	fsyscall_gtod_data.clk_cycle_last = tk->tkr_mono.cycle_last;
+
+	fsyscall_gtod_data.wall_time.sec = tk->xtime_sec;
+	fsyscall_gtod_data.wall_time.snsec = tk->tkr_mono.xtime_nsec;
+
+	fsyscall_gtod_data.monotonic_time.sec = tk->xtime_sec
+					      + tk->wall_to_monotonic.tv_sec;
+	fsyscall_gtod_data.monotonic_time.snsec = tk->tkr_mono.xtime_nsec
+						+ ((u64)tk->wall_to_monotonic.tv_nsec
+							<< tk->tkr_mono.shift);
+
+	/* normalize */
+	while (fsyscall_gtod_data.monotonic_time.snsec >=
+					(((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
+		fsyscall_gtod_data.monotonic_time.snsec -=
+					((u64)NSEC_PER_SEC) << tk->tkr_mono.shift;
+		fsyscall_gtod_data.monotonic_time.sec++;
+	}
+
+	write_seqcount_end(&fsyscall_gtod_data.seq);
+}
+
diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
new file mode 100644
index 000000000..94a848b06
--- /dev/null
+++ b/arch/ia64/kernel/topology.c
@@ -0,0 +1,410 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * This file contains NUMA specific variables and functions which are used on
+ * NUMA machines with contiguous memory.
+ * 		2002/08/07 Erich Focht <efocht@ess.nec.de>
+ * Populate cpu entries in sysfs for non-numa systems as well
+ *  	Intel Corporation - Ashok Raj
+ * 02/27/2006 Zhang, Yanmin
+ *	Populate cpu cache entries in sysfs for cpu cache info
+ */
+
+#include <linux/cpu.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/node.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/memblock.h>
+#include <linux/nodemask.h>
+#include <linux/notifier.h>
+#include <linux/export.h>
+#include <asm/mmzone.h>
+#include <asm/numa.h>
+#include <asm/cpu.h>
+
+static struct ia64_cpu *sysfs_cpus;
+
+void arch_fix_phys_package_id(int num, u32 slot)
+{
+#ifdef CONFIG_SMP
+	if (cpu_data(num)->socket_id == -1)
+		cpu_data(num)->socket_id = slot;
+#endif
+}
+EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
+
+
+#ifdef CONFIG_HOTPLUG_CPU
+int __ref arch_register_cpu(int num)
+{
+	/*
+	 * If CPEI can be re-targeted or if this is not
+	 * CPEI target, then it is hotpluggable
+	 */
+	if (can_cpei_retarget() || !is_cpu_cpei_target(num))
+		sysfs_cpus[num].cpu.hotpluggable = 1;
+	map_cpu_to_node(num, node_cpuid[num].nid);
+	return register_cpu(&sysfs_cpus[num].cpu, num);
+}
+EXPORT_SYMBOL(arch_register_cpu);
+
+void __ref arch_unregister_cpu(int num)
+{
+	unregister_cpu(&sysfs_cpus[num].cpu);
+	unmap_cpu_from_node(num, cpu_to_node(num));
+}
+EXPORT_SYMBOL(arch_unregister_cpu);
+#else
+static int __init arch_register_cpu(int num)
+{
+	return register_cpu(&sysfs_cpus[num].cpu, num);
+}
+#endif /*CONFIG_HOTPLUG_CPU*/
+
+
+static int __init topology_init(void)
+{
+	int i, err = 0;
+
+	sysfs_cpus = kcalloc(NR_CPUS, sizeof(struct ia64_cpu), GFP_KERNEL);
+	if (!sysfs_cpus)
+		panic("kzalloc in topology_init failed - NR_CPUS too big?");
+
+	for_each_present_cpu(i) {
+		if((err = arch_register_cpu(i)))
+			goto out;
+	}
+out:
+	return err;
+}
+
+subsys_initcall(topology_init);
+
+
+/*
+ * Export cpu cache information through sysfs
+ */
+
+/*
+ *  A bunch of string array to get pretty printing
+ */
+static const char *cache_types[] = {
+	"",			/* not used */
+	"Instruction",
+	"Data",
+	"Unified"	/* unified */
+};
+
+static const char *cache_mattrib[]={
+	"WriteThrough",
+	"WriteBack",
+	"",		/* reserved */
+	""		/* reserved */
+};
+
+struct cache_info {
+	pal_cache_config_info_t	cci;
+	cpumask_t shared_cpu_map;
+	int level;
+	int type;
+	struct kobject kobj;
+};
+
+struct cpu_cache_info {
+	struct cache_info *cache_leaves;
+	int	num_cache_leaves;
+	struct kobject kobj;
+};
+
+static struct cpu_cache_info	all_cpu_cache_info[NR_CPUS];
+#define LEAF_KOBJECT_PTR(x,y)    (&all_cpu_cache_info[x].cache_leaves[y])
+
+#ifdef CONFIG_SMP
+static void cache_shared_cpu_map_setup(unsigned int cpu,
+		struct cache_info * this_leaf)
+{
+	pal_cache_shared_info_t	csi;
+	int num_shared, i = 0;
+	unsigned int j;
+
+	if (cpu_data(cpu)->threads_per_core <= 1 &&
+		cpu_data(cpu)->cores_per_socket <= 1) {
+		cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
+		return;
+	}
+
+	if (ia64_pal_cache_shared_info(this_leaf->level,
+					this_leaf->type,
+					0,
+					&csi) != PAL_STATUS_SUCCESS)
+		return;
+
+	num_shared = (int) csi.num_shared;
+	do {
+		for_each_possible_cpu(j)
+			if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
+				&& cpu_data(j)->core_id == csi.log1_cid
+				&& cpu_data(j)->thread_id == csi.log1_tid)
+				cpumask_set_cpu(j, &this_leaf->shared_cpu_map);
+
+		i++;
+	} while (i < num_shared &&
+		ia64_pal_cache_shared_info(this_leaf->level,
+				this_leaf->type,
+				i,
+				&csi) == PAL_STATUS_SUCCESS);
+}
+#else
+static void cache_shared_cpu_map_setup(unsigned int cpu,
+		struct cache_info * this_leaf)
+{
+	cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
+	return;
+}
+#endif
+
+static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
+					char *buf)
+{
+	return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
+}
+
+static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
+					char *buf)
+{
+	return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
+}
+
+static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
+{
+	return sprintf(buf,
+			"%s\n",
+			cache_mattrib[this_leaf->cci.pcci_cache_attr]);
+}
+
+static ssize_t show_size(struct cache_info *this_leaf, char *buf)
+{
+	return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
+}
+
+static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
+{
+	unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
+	number_of_sets /= this_leaf->cci.pcci_assoc;
+	number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
+
+	return sprintf(buf, "%u\n", number_of_sets);
+}
+
+static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
+{
+	cpumask_t shared_cpu_map;
+
+	cpumask_and(&shared_cpu_map,
+				&this_leaf->shared_cpu_map, cpu_online_mask);
+	return scnprintf(buf, PAGE_SIZE, "%*pb\n",
+			 cpumask_pr_args(&shared_cpu_map));
+}
+
+static ssize_t show_type(struct cache_info *this_leaf, char *buf)
+{
+	int type = this_leaf->type + this_leaf->cci.pcci_unified;
+	return sprintf(buf, "%s\n", cache_types[type]);
+}
+
+static ssize_t show_level(struct cache_info *this_leaf, char *buf)
+{
+	return sprintf(buf, "%u\n", this_leaf->level);
+}
+
+struct cache_attr {
+	struct attribute attr;
+	ssize_t (*show)(struct cache_info *, char *);
+	ssize_t (*store)(struct cache_info *, const char *, size_t count);
+};
+
+#ifdef define_one_ro
+	#undef define_one_ro
+#endif
+#define define_one_ro(_name) \
+	static struct cache_attr _name = \
+__ATTR(_name, 0444, show_##_name, NULL)
+
+define_one_ro(level);
+define_one_ro(type);
+define_one_ro(coherency_line_size);
+define_one_ro(ways_of_associativity);
+define_one_ro(size);
+define_one_ro(number_of_sets);
+define_one_ro(shared_cpu_map);
+define_one_ro(attributes);
+
+static struct attribute * cache_default_attrs[] = {
+	&type.attr,
+	&level.attr,
+	&coherency_line_size.attr,
+	&ways_of_associativity.attr,
+	&attributes.attr,
+	&size.attr,
+	&number_of_sets.attr,
+	&shared_cpu_map.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(cache_default);
+
+#define to_object(k) container_of(k, struct cache_info, kobj)
+#define to_attr(a) container_of(a, struct cache_attr, attr)
+
+static ssize_t ia64_cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
+{
+	struct cache_attr *fattr = to_attr(attr);
+	struct cache_info *this_leaf = to_object(kobj);
+	ssize_t ret;
+
+	ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
+	return ret;
+}
+
+static const struct sysfs_ops cache_sysfs_ops = {
+	.show   = ia64_cache_show
+};
+
+static struct kobj_type cache_ktype = {
+	.sysfs_ops	= &cache_sysfs_ops,
+	.default_groups	= cache_default_groups,
+};
+
+static struct kobj_type cache_ktype_percpu_entry = {
+	.sysfs_ops	= &cache_sysfs_ops,
+};
+
+static void cpu_cache_sysfs_exit(unsigned int cpu)
+{
+	kfree(all_cpu_cache_info[cpu].cache_leaves);
+	all_cpu_cache_info[cpu].cache_leaves = NULL;
+	all_cpu_cache_info[cpu].num_cache_leaves = 0;
+	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
+	return;
+}
+
+static int cpu_cache_sysfs_init(unsigned int cpu)
+{
+	unsigned long i, levels, unique_caches;
+	pal_cache_config_info_t cci;
+	int j;
+	long status;
+	struct cache_info *this_cache;
+	int num_cache_leaves = 0;
+
+	if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
+		printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
+		return -1;
+	}
+
+	this_cache=kcalloc(unique_caches, sizeof(struct cache_info),
+			   GFP_KERNEL);
+	if (this_cache == NULL)
+		return -ENOMEM;
+
+	for (i=0; i < levels; i++) {
+		for (j=2; j >0 ; j--) {
+			if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
+					PAL_STATUS_SUCCESS)
+				continue;
+
+			this_cache[num_cache_leaves].cci = cci;
+			this_cache[num_cache_leaves].level = i + 1;
+			this_cache[num_cache_leaves].type = j;
+
+			cache_shared_cpu_map_setup(cpu,
+					&this_cache[num_cache_leaves]);
+			num_cache_leaves ++;
+		}
+	}
+
+	all_cpu_cache_info[cpu].cache_leaves = this_cache;
+	all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
+
+	memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
+
+	return 0;
+}
+
+/* Add cache interface for CPU device */
+static int cache_add_dev(unsigned int cpu)
+{
+	struct device *sys_dev = get_cpu_device(cpu);
+	unsigned long i, j;
+	struct cache_info *this_object;
+	int retval = 0;
+
+	if (all_cpu_cache_info[cpu].kobj.parent)
+		return 0;
+
+
+	retval = cpu_cache_sysfs_init(cpu);
+	if (unlikely(retval < 0))
+		return retval;
+
+	retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj,
+				      &cache_ktype_percpu_entry, &sys_dev->kobj,
+				      "%s", "cache");
+	if (unlikely(retval < 0)) {
+		cpu_cache_sysfs_exit(cpu);
+		return retval;
+	}
+
+	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
+		this_object = LEAF_KOBJECT_PTR(cpu,i);
+		retval = kobject_init_and_add(&(this_object->kobj),
+					      &cache_ktype,
+					      &all_cpu_cache_info[cpu].kobj,
+					      "index%1lu", i);
+		if (unlikely(retval)) {
+			for (j = 0; j < i; j++) {
+				kobject_put(&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
+			}
+			kobject_put(&all_cpu_cache_info[cpu].kobj);
+			cpu_cache_sysfs_exit(cpu);
+			return retval;
+		}
+		kobject_uevent(&(this_object->kobj), KOBJ_ADD);
+	}
+	kobject_uevent(&all_cpu_cache_info[cpu].kobj, KOBJ_ADD);
+	return retval;
+}
+
+/* Remove cache interface for CPU device */
+static int cache_remove_dev(unsigned int cpu)
+{
+	unsigned long i;
+
+	for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
+		kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
+
+	if (all_cpu_cache_info[cpu].kobj.parent) {
+		kobject_put(&all_cpu_cache_info[cpu].kobj);
+		memset(&all_cpu_cache_info[cpu].kobj,
+			0,
+			sizeof(struct kobject));
+	}
+
+	cpu_cache_sysfs_exit(cpu);
+
+	return 0;
+}
+
+static int __init cache_sysfs_init(void)
+{
+	int ret;
+
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/topology:online",
+				cache_add_dev, cache_remove_dev);
+	WARN_ON(ret < 0);
+	return 0;
+}
+device_initcall(cache_sysfs_init);
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
new file mode 100644
index 000000000..53735b1d1
--- /dev/null
+++ b/arch/ia64/kernel/traps.c
@@ -0,0 +1,612 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Architecture-specific trap handling.
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * 05/12/00 grao <goutham.rao@intel.com> : added isr in siginfo for SIGFPE
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/debug.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>		/* For unblank_screen() */
+#include <linux/export.h>
+#include <linux/extable.h>
+#include <linux/hardirq.h>
+#include <linux/kprobes.h>
+#include <linux/delay.h>		/* for ssleep() */
+#include <linux/kdebug.h>
+#include <linux/uaccess.h>
+
+#include <asm/fpswa.h>
+#include <asm/intrinsics.h>
+#include <asm/processor.h>
+#include <asm/exception.h>
+#include <asm/setup.h>
+
+fpswa_interface_t *fpswa_interface;
+EXPORT_SYMBOL(fpswa_interface);
+
+void __init
+trap_init (void)
+{
+	if (ia64_boot_param->fpswa)
+		/* FPSWA fixup: make the interface pointer a kernel virtual address: */
+		fpswa_interface = __va(ia64_boot_param->fpswa);
+}
+
+int
+die (const char *str, struct pt_regs *regs, long err)
+{
+	static struct {
+		spinlock_t lock;
+		u32 lock_owner;
+		int lock_owner_depth;
+	} die = {
+		.lock =	__SPIN_LOCK_UNLOCKED(die.lock),
+		.lock_owner = -1,
+		.lock_owner_depth = 0
+	};
+	static int die_counter;
+	int cpu = get_cpu();
+
+	if (die.lock_owner != cpu) {
+		console_verbose();
+		spin_lock_irq(&die.lock);
+		die.lock_owner = cpu;
+		die.lock_owner_depth = 0;
+		bust_spinlocks(1);
+	}
+	put_cpu();
+
+	if (++die.lock_owner_depth < 3) {
+		printk("%s[%d]: %s %ld [%d]\n",
+		current->comm, task_pid_nr(current), str, err, ++die_counter);
+		if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV)
+	            != NOTIFY_STOP)
+			show_regs(regs);
+		else
+			regs = NULL;
+  	} else
+		printk(KERN_ERR "Recursive die() failure, output suppressed\n");
+
+	bust_spinlocks(0);
+	die.lock_owner = -1;
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+	spin_unlock_irq(&die.lock);
+
+	if (!regs)
+		return 1;
+
+	if (panic_on_oops)
+		panic("Fatal exception");
+
+	make_task_dead(SIGSEGV);
+	return 0;
+}
+
+int
+die_if_kernel (char *str, struct pt_regs *regs, long err)
+{
+	if (!user_mode(regs))
+		return die(str, regs, err);
+	return 0;
+}
+
+void
+__kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
+{
+	int sig, code;
+
+	switch (break_num) {
+	      case 0: /* unknown error (used by GCC for __builtin_abort()) */
+		if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
+			       	== NOTIFY_STOP)
+			return;
+		if (die_if_kernel("bugcheck!", regs, break_num))
+			return;
+		sig = SIGILL; code = ILL_ILLOPC;
+		break;
+
+	      case 1: /* integer divide by zero */
+		sig = SIGFPE; code = FPE_INTDIV;
+		break;
+
+	      case 2: /* integer overflow */
+		sig = SIGFPE; code = FPE_INTOVF;
+		break;
+
+	      case 3: /* range check/bounds check */
+		sig = SIGFPE; code = FPE_FLTSUB;
+		break;
+
+	      case 4: /* null pointer dereference */
+		sig = SIGSEGV; code = SEGV_MAPERR;
+		break;
+
+	      case 5: /* misaligned data */
+		sig = SIGSEGV; code = BUS_ADRALN;
+		break;
+
+	      case 6: /* decimal overflow */
+		sig = SIGFPE; code = __FPE_DECOVF;
+		break;
+
+	      case 7: /* decimal divide by zero */
+		sig = SIGFPE; code = __FPE_DECDIV;
+		break;
+
+	      case 8: /* packed decimal error */
+		sig = SIGFPE; code = __FPE_DECERR;
+		break;
+
+	      case 9: /* invalid ASCII digit */
+		sig = SIGFPE; code = __FPE_INVASC;
+		break;
+
+	      case 10: /* invalid decimal digit */
+		sig = SIGFPE; code = __FPE_INVDEC;
+		break;
+
+	      case 11: /* paragraph stack overflow */
+		sig = SIGSEGV; code = __SEGV_PSTKOVF;
+		break;
+
+	      case 0x3f000 ... 0x3ffff:	/* bundle-update in progress */
+		sig = SIGILL; code = __ILL_BNDMOD;
+		break;
+
+	      default:
+		if ((break_num < 0x40000 || break_num > 0x100000)
+		    && die_if_kernel("Bad break", regs, break_num))
+			return;
+
+		if (break_num < 0x80000) {
+			sig = SIGILL; code = __ILL_BREAK;
+		} else {
+			if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
+					== NOTIFY_STOP)
+				return;
+			sig = SIGTRAP; code = TRAP_BRKPT;
+		}
+	}
+	force_sig_fault(sig, code,
+			(void __user *) (regs->cr_iip + ia64_psr(regs)->ri),
+			break_num, 0 /* clear __ISR_VALID */, 0);
+}
+
+/*
+ * disabled_fph_fault() is called when a user-level process attempts to access f32..f127
+ * and it doesn't own the fp-high register partition.  When this happens, we save the
+ * current fph partition in the task_struct of the fpu-owner (if necessary) and then load
+ * the fp-high partition of the current task (if necessary).  Note that the kernel has
+ * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
+ * care of clearing psr.dfh.
+ */
+static inline void
+disabled_fph_fault (struct pt_regs *regs)
+{
+	struct ia64_psr *psr = ia64_psr(regs);
+
+	/* first, grant user-level access to fph partition: */
+	psr->dfh = 0;
+
+	/*
+	 * Make sure that no other task gets in on this processor
+	 * while we're claiming the FPU
+	 */
+	preempt_disable();
+#ifndef CONFIG_SMP
+	{
+		struct task_struct *fpu_owner
+			= (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
+
+		if (ia64_is_local_fpu_owner(current)) {
+			preempt_enable_no_resched();
+			return;
+		}
+
+		if (fpu_owner)
+			ia64_flush_fph(fpu_owner);
+	}
+#endif /* !CONFIG_SMP */
+	ia64_set_local_fpu_owner(current);
+	if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
+		__ia64_load_fpu(current->thread.fph);
+		psr->mfh = 0;
+	} else {
+		__ia64_init_fpu();
+		/*
+		 * Set mfh because the state in thread.fph does not match the state in
+		 * the fph partition.
+		 */
+		psr->mfh = 1;
+	}
+	preempt_enable_no_resched();
+}
+
+static inline int
+fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
+	    struct pt_regs *regs)
+{
+	fp_state_t fp_state;
+	fpswa_ret_t ret;
+
+	if (!fpswa_interface)
+		return -1;
+
+	memset(&fp_state, 0, sizeof(fp_state_t));
+
+	/*
+	 * compute fp_state.  only FP registers f6 - f11 are used by the
+	 * kernel, so set those bits in the mask and set the low volatile
+	 * pointer to point to these registers.
+	 */
+	fp_state.bitmask_low64 = 0xfc0;  /* bit6..bit11 */
+
+	fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) &regs->f6;
+	/*
+	 * unsigned long (*EFI_FPSWA) (
+	 *      unsigned long    trap_type,
+	 *	void             *Bundle,
+	 *	unsigned long    *pipsr,
+	 *	unsigned long    *pfsr,
+	 *	unsigned long    *pisr,
+	 *	unsigned long    *ppreds,
+	 *	unsigned long    *pifs,
+	 *	void             *fp_state);
+	 */
+	ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
+					(unsigned long *) ipsr, (unsigned long *) fpsr,
+					(unsigned long *) isr, (unsigned long *) pr,
+					(unsigned long *) ifs, &fp_state);
+
+	return ret.status;
+}
+
+struct fpu_swa_msg {
+	unsigned long count;
+	unsigned long time;
+};
+static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
+DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
+static struct fpu_swa_msg last __cacheline_aligned;
+
+
+/*
+ * Handle floating-point assist faults and traps.
+ */
+static int
+handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
+{
+	long exception, bundle[2];
+	unsigned long fault_ip;
+
+	fault_ip = regs->cr_iip;
+	if (!fp_fault && (ia64_psr(regs)->ri == 0))
+		fault_ip -= 16;
+	if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
+		return -1;
+
+	if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT))  {
+		unsigned long count, current_jiffies = jiffies;
+		struct fpu_swa_msg *cp = this_cpu_ptr(&cpulast);
+
+		if (unlikely(current_jiffies > cp->time))
+			cp->count = 0;
+		if (unlikely(cp->count < 5)) {
+			cp->count++;
+			cp->time = current_jiffies + 5 * HZ;
+
+			/* minimize races by grabbing a copy of count BEFORE checking last.time. */
+			count = last.count;
+			barrier();
+
+			/*
+			 * Lower 4 bits are used as a count. Upper bits are a sequence
+			 * number that is updated when count is reset. The cmpxchg will
+			 * fail is seqno has changed. This minimizes multiple cpus
+			 * resetting the count.
+			 */
+			if (current_jiffies > last.time)
+				(void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
+
+			/* used fetchadd to atomically update the count */
+			if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
+				last.time = current_jiffies + 5 * HZ;
+				printk(KERN_WARNING
+		       			"%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
+		       			current->comm, task_pid_nr(current), regs->cr_iip + ia64_psr(regs)->ri, isr);
+			}
+		}
+	}
+
+	exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
+			       &regs->cr_ifs, regs);
+	if (fp_fault) {
+		if (exception == 0) {
+			/* emulation was successful */
+			ia64_increment_ip(regs);
+		} else if (exception == -1) {
+			printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
+			return -1;
+		} else {
+			/* is next instruction a trap? */
+			int si_code;
+
+			if (exception & 2) {
+				ia64_increment_ip(regs);
+			}
+			si_code = FPE_FLTUNK;	/* default code */
+			if (isr & 0x11) {
+				si_code = FPE_FLTINV;
+			} else if (isr & 0x22) {
+				/* denormal operand gets the same si_code as underflow 
+				* see arch/i386/kernel/traps.c:math_error()  */
+				si_code = FPE_FLTUND;
+			} else if (isr & 0x44) {
+				si_code = FPE_FLTDIV;
+			}
+			force_sig_fault(SIGFPE, si_code,
+					(void __user *) (regs->cr_iip + ia64_psr(regs)->ri),
+					0, __ISR_VALID, isr);
+		}
+	} else {
+		if (exception == -1) {
+			printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
+			return -1;
+		} else if (exception != 0) {
+			/* raise exception */
+			int si_code;
+
+			si_code = FPE_FLTUNK;	/* default code */
+			if (isr & 0x880) {
+				si_code = FPE_FLTOVF;
+			} else if (isr & 0x1100) {
+				si_code = FPE_FLTUND;
+			} else if (isr & 0x2200) {
+				si_code = FPE_FLTRES;
+			}
+			force_sig_fault(SIGFPE, si_code,
+					(void __user *) (regs->cr_iip + ia64_psr(regs)->ri),
+					0, __ISR_VALID, isr);
+		}
+	}
+	return 0;
+}
+
+struct illegal_op_return {
+	unsigned long fkt, arg1, arg2, arg3;
+};
+
+struct illegal_op_return
+ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
+		       long arg4, long arg5, long arg6, long arg7,
+		       struct pt_regs regs)
+{
+	struct illegal_op_return rv;
+	char buf[128];
+
+#ifdef CONFIG_IA64_BRL_EMU
+	{
+		extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
+
+		rv = ia64_emulate_brl(&regs, ec);
+		if (rv.fkt != (unsigned long) -1)
+			return rv;
+	}
+#endif
+
+	sprintf(buf, "IA-64 Illegal operation fault");
+	rv.fkt = 0;
+	if (die_if_kernel(buf, &regs, 0))
+		return rv;
+
+	force_sig_fault(SIGILL, ILL_ILLOPC,
+			(void __user *) (regs.cr_iip + ia64_psr(&regs)->ri),
+			0, 0, 0);
+	return rv;
+}
+
+void __kprobes
+ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
+	    unsigned long iim, unsigned long itir, long arg5, long arg6,
+	    long arg7, struct pt_regs regs)
+{
+	unsigned long code, error = isr, iip;
+	char buf[128];
+	int result, sig, si_code;
+	static const char *reason[] = {
+		"IA-64 Illegal Operation fault",
+		"IA-64 Privileged Operation fault",
+		"IA-64 Privileged Register fault",
+		"IA-64 Reserved Register/Field fault",
+		"Disabled Instruction Set Transition fault",
+		"Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
+		"Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
+		"Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
+	};
+
+	if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
+		/*
+		 * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
+		 * the lfetch.
+		 */
+		ia64_psr(&regs)->ed = 1;
+		return;
+	}
+
+	iip = regs.cr_iip + ia64_psr(&regs)->ri;
+
+	switch (vector) {
+	      case 24: /* General Exception */
+		code = (isr >> 4) & 0xf;
+		sprintf(buf, "General Exception: %s%s", reason[code],
+			(code == 3) ? ((isr & (1UL << 37))
+				       ? " (RSE access)" : " (data access)") : "");
+		if (code == 8) {
+# ifdef CONFIG_IA64_PRINT_HAZARDS
+			printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
+			       current->comm, task_pid_nr(current),
+			       regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
+# endif
+			return;
+		}
+		break;
+
+	      case 25: /* Disabled FP-Register */
+		if (isr & 2) {
+			disabled_fph_fault(&regs);
+			return;
+		}
+		sprintf(buf, "Disabled FPL fault---not supposed to happen!");
+		break;
+
+	      case 26: /* NaT Consumption */
+		if (user_mode(&regs)) {
+			void __user *addr;
+
+			if (((isr >> 4) & 0xf) == 2) {
+				/* NaT page consumption */
+				sig = SIGSEGV;
+				code = SEGV_ACCERR;
+				addr = (void __user *) ifa;
+			} else {
+				/* register NaT consumption */
+				sig = SIGILL;
+				code = ILL_ILLOPN;
+				addr = (void __user *) (regs.cr_iip
+							+ ia64_psr(&regs)->ri);
+			}
+			force_sig_fault(sig, code, addr,
+					vector, __ISR_VALID, isr);
+			return;
+		} else if (ia64_done_with_exception(&regs))
+			return;
+		sprintf(buf, "NaT consumption");
+		break;
+
+	      case 31: /* Unsupported Data Reference */
+		if (user_mode(&regs)) {
+			force_sig_fault(SIGILL, ILL_ILLOPN, (void __user *) iip,
+					vector, __ISR_VALID, isr);
+			return;
+		}
+		sprintf(buf, "Unsupported data reference");
+		break;
+
+	      case 29: /* Debug */
+	      case 35: /* Taken Branch Trap */
+	      case 36: /* Single Step Trap */
+		if (fsys_mode(current, &regs)) {
+			extern char __kernel_syscall_via_break[];
+			/*
+			 * Got a trap in fsys-mode: Taken Branch Trap
+			 * and Single Step trap need special handling;
+			 * Debug trap is ignored (we disable it here
+			 * and re-enable it in the lower-privilege trap).
+			 */
+			if (unlikely(vector == 29)) {
+				set_thread_flag(TIF_DB_DISABLED);
+				ia64_psr(&regs)->db = 0;
+				ia64_psr(&regs)->lp = 1;
+				return;
+			}
+			/* re-do the system call via break 0x100000: */
+			regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
+			ia64_psr(&regs)->ri = 0;
+			ia64_psr(&regs)->cpl = 3;
+			return;
+		}
+		switch (vector) {
+		      default:
+		      case 29:
+			si_code = TRAP_HWBKPT;
+#ifdef CONFIG_ITANIUM
+			/*
+			 * Erratum 10 (IFA may contain incorrect address) now has
+			 * "NoFix" status.  There are no plans for fixing this.
+			 */
+			if (ia64_psr(&regs)->is == 0)
+			  ifa = regs.cr_iip;
+#endif
+			break;
+		      case 35: si_code = TRAP_BRANCH; ifa = 0; break;
+		      case 36: si_code = TRAP_TRACE; ifa = 0; break;
+		}
+		if (notify_die(DIE_FAULT, "ia64_fault", &regs, vector, si_code, SIGTRAP)
+			       	== NOTIFY_STOP)
+			return;
+		force_sig_fault(SIGTRAP, si_code, (void __user *) ifa,
+				0, __ISR_VALID, isr);
+		return;
+
+	      case 32: /* fp fault */
+	      case 33: /* fp trap */
+		result = handle_fpu_swa((vector == 32) ? 1 : 0, &regs, isr);
+		if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
+			force_sig_fault(SIGFPE, FPE_FLTINV, (void __user *) iip,
+					0, __ISR_VALID, isr);
+		}
+		return;
+
+	      case 34:
+		if (isr & 0x2) {
+			/* Lower-Privilege Transfer Trap */
+
+			/* If we disabled debug traps during an fsyscall,
+			 * re-enable them here.
+			 */
+			if (test_thread_flag(TIF_DB_DISABLED)) {
+				clear_thread_flag(TIF_DB_DISABLED);
+				ia64_psr(&regs)->db = 1;
+			}
+
+			/*
+			 * Just clear PSR.lp and then return immediately:
+			 * all the interesting work (e.g., signal delivery)
+			 * is done in the kernel exit path.
+			 */
+			ia64_psr(&regs)->lp = 0;
+			return;
+		} else {
+			/* Unimplemented Instr. Address Trap */
+			if (user_mode(&regs)) {
+				force_sig_fault(SIGILL, ILL_BADIADDR,
+						(void __user *) iip,
+						0, 0, 0);
+				return;
+			}
+			sprintf(buf, "Unimplemented Instruction Address fault");
+		}
+		break;
+
+	      case 45:
+		printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
+		printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
+		       iip, ifa, isr);
+		force_sig(SIGSEGV);
+		return;
+
+	      case 46:
+		printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
+		printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
+		       iip, ifa, isr, iim);
+		force_sig(SIGSEGV);
+		return;
+
+	      case 47:
+		sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
+		break;
+
+	      default:
+		sprintf(buf, "Fault %lu", vector);
+		break;
+	}
+	if (!die_if_kernel(buf, &regs, error))
+		force_sig(SIGILL);
+}
diff --git a/arch/ia64/kernel/unaligned.c b/arch/ia64/kernel/unaligned.c
new file mode 100644
index 000000000..0acb5a0cd
--- /dev/null
+++ b/arch/ia64/kernel/unaligned.c
@@ -0,0 +1,1560 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Architecture-specific unaligned trap handling.
+ *
+ * Copyright (C) 1999-2002, 2004 Hewlett-Packard Co
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * 2002/12/09   Fix rotating register handling (off-by-1 error, missing fr-rotation).  Fix
+ *		get_rse_reg() to not leak kernel bits to user-level (reading an out-of-frame
+ *		stacked register returns an undefined value; it does NOT trigger a
+ *		"rsvd register fault").
+ * 2001/10/11	Fix unaligned access to rotating registers in s/w pipelined loops.
+ * 2001/08/13	Correct size of extended floats (float_fsz) from 16 to 10 bytes.
+ * 2001/01/17	Add support emulation of unaligned kernel accesses.
+ */
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/tty.h>
+#include <linux/extable.h>
+#include <linux/ratelimit.h>
+#include <linux/uaccess.h>
+
+#include <asm/intrinsics.h>
+#include <asm/processor.h>
+#include <asm/rse.h>
+#include <asm/exception.h>
+#include <asm/unaligned.h>
+
+extern int die_if_kernel(char *str, struct pt_regs *regs, long err);
+
+#undef DEBUG_UNALIGNED_TRAP
+
+#ifdef DEBUG_UNALIGNED_TRAP
+# define DPRINT(a...)	do { printk("%s %u: ", __func__, __LINE__); printk (a); } while (0)
+# define DDUMP(str,vp,len)	dump(str, vp, len)
+
+static void
+dump (const char *str, void *vp, size_t len)
+{
+	unsigned char *cp = vp;
+	int i;
+
+	printk("%s", str);
+	for (i = 0; i < len; ++i)
+		printk (" %02x", *cp++);
+	printk("\n");
+}
+#else
+# define DPRINT(a...)
+# define DDUMP(str,vp,len)
+#endif
+
+#define IA64_FIRST_STACKED_GR	32
+#define IA64_FIRST_ROTATING_FR	32
+#define SIGN_EXT9		0xffffffffffffff00ul
+
+/*
+ *  sysctl settable hook which tells the kernel whether to honor the
+ *  IA64_THREAD_UAC_NOPRINT prctl.  Because this is user settable, we want
+ *  to allow the super user to enable/disable this for security reasons
+ *  (i.e. don't allow attacker to fill up logs with unaligned accesses).
+ */
+int no_unaligned_warning;
+int unaligned_dump_stack;
+
+/*
+ * For M-unit:
+ *
+ *  opcode |   m  |   x6    |
+ * --------|------|---------|
+ * [40-37] | [36] | [35:30] |
+ * --------|------|---------|
+ *     4   |   1  |    6    | = 11 bits
+ * --------------------------
+ * However bits [31:30] are not directly useful to distinguish between
+ * load/store so we can use [35:32] instead, which gives the following
+ * mask ([40:32]) using 9 bits. The 'e' comes from the fact that we defer
+ * checking the m-bit until later in the load/store emulation.
+ */
+#define IA64_OPCODE_MASK	0x1ef
+#define IA64_OPCODE_SHIFT	32
+
+/*
+ * Table C-28 Integer Load/Store
+ *
+ * We ignore [35:32]= 0x6, 0x7, 0xE, 0xF
+ *
+ * ld8.fill, st8.fill  MUST be aligned because the RNATs are based on
+ * the address (bits [8:3]), so we must failed.
+ */
+#define LD_OP            0x080
+#define LDS_OP           0x081
+#define LDA_OP           0x082
+#define LDSA_OP          0x083
+#define LDBIAS_OP        0x084
+#define LDACQ_OP         0x085
+/* 0x086, 0x087 are not relevant */
+#define LDCCLR_OP        0x088
+#define LDCNC_OP         0x089
+#define LDCCLRACQ_OP     0x08a
+#define ST_OP            0x08c
+#define STREL_OP         0x08d
+/* 0x08e,0x8f are not relevant */
+
+/*
+ * Table C-29 Integer Load +Reg
+ *
+ * we use the ld->m (bit [36:36]) field to determine whether or not we have
+ * a load/store of this form.
+ */
+
+/*
+ * Table C-30 Integer Load/Store +Imm
+ *
+ * We ignore [35:32]= 0x6, 0x7, 0xE, 0xF
+ *
+ * ld8.fill, st8.fill  must be aligned because the Nat register are based on
+ * the address, so we must fail and the program must be fixed.
+ */
+#define LD_IMM_OP            0x0a0
+#define LDS_IMM_OP           0x0a1
+#define LDA_IMM_OP           0x0a2
+#define LDSA_IMM_OP          0x0a3
+#define LDBIAS_IMM_OP        0x0a4
+#define LDACQ_IMM_OP         0x0a5
+/* 0x0a6, 0xa7 are not relevant */
+#define LDCCLR_IMM_OP        0x0a8
+#define LDCNC_IMM_OP         0x0a9
+#define LDCCLRACQ_IMM_OP     0x0aa
+#define ST_IMM_OP            0x0ac
+#define STREL_IMM_OP         0x0ad
+/* 0x0ae,0xaf are not relevant */
+
+/*
+ * Table C-32 Floating-point Load/Store
+ */
+#define LDF_OP           0x0c0
+#define LDFS_OP          0x0c1
+#define LDFA_OP          0x0c2
+#define LDFSA_OP         0x0c3
+/* 0x0c6 is irrelevant */
+#define LDFCCLR_OP       0x0c8
+#define LDFCNC_OP        0x0c9
+/* 0x0cb is irrelevant  */
+#define STF_OP           0x0cc
+
+/*
+ * Table C-33 Floating-point Load +Reg
+ *
+ * we use the ld->m (bit [36:36]) field to determine whether or not we have
+ * a load/store of this form.
+ */
+
+/*
+ * Table C-34 Floating-point Load/Store +Imm
+ */
+#define LDF_IMM_OP       0x0e0
+#define LDFS_IMM_OP      0x0e1
+#define LDFA_IMM_OP      0x0e2
+#define LDFSA_IMM_OP     0x0e3
+/* 0x0e6 is irrelevant */
+#define LDFCCLR_IMM_OP   0x0e8
+#define LDFCNC_IMM_OP    0x0e9
+#define STF_IMM_OP       0x0ec
+
+typedef struct {
+	unsigned long	 qp:6;	/* [0:5]   */
+	unsigned long    r1:7;	/* [6:12]  */
+	unsigned long   imm:7;	/* [13:19] */
+	unsigned long    r3:7;	/* [20:26] */
+	unsigned long     x:1;  /* [27:27] */
+	unsigned long  hint:2;	/* [28:29] */
+	unsigned long x6_sz:2;	/* [30:31] */
+	unsigned long x6_op:4;	/* [32:35], x6 = x6_sz|x6_op */
+	unsigned long     m:1;	/* [36:36] */
+	unsigned long    op:4;	/* [37:40] */
+	unsigned long   pad:23; /* [41:63] */
+} load_store_t;
+
+
+typedef enum {
+	UPD_IMMEDIATE,	/* ldXZ r1=[r3],imm(9) */
+	UPD_REG		/* ldXZ r1=[r3],r2     */
+} update_t;
+
+/*
+ * We use tables to keep track of the offsets of registers in the saved state.
+ * This way we save having big switch/case statements.
+ *
+ * We use bit 0 to indicate switch_stack or pt_regs.
+ * The offset is simply shifted by 1 bit.
+ * A 2-byte value should be enough to hold any kind of offset
+ *
+ * In case the calling convention changes (and thus pt_regs/switch_stack)
+ * simply use RSW instead of RPT or vice-versa.
+ */
+
+#define RPO(x)	((size_t) &((struct pt_regs *)0)->x)
+#define RSO(x)	((size_t) &((struct switch_stack *)0)->x)
+
+#define RPT(x)		(RPO(x) << 1)
+#define RSW(x)		(1| RSO(x)<<1)
+
+#define GR_OFFS(x)	(gr_info[x]>>1)
+#define GR_IN_SW(x)	(gr_info[x] & 0x1)
+
+#define FR_OFFS(x)	(fr_info[x]>>1)
+#define FR_IN_SW(x)	(fr_info[x] & 0x1)
+
+static u16 gr_info[32]={
+	0,			/* r0 is read-only : WE SHOULD NEVER GET THIS */
+
+	RPT(r1), RPT(r2), RPT(r3),
+
+	RSW(r4), RSW(r5), RSW(r6), RSW(r7),
+
+	RPT(r8), RPT(r9), RPT(r10), RPT(r11),
+	RPT(r12), RPT(r13), RPT(r14), RPT(r15),
+
+	RPT(r16), RPT(r17), RPT(r18), RPT(r19),
+	RPT(r20), RPT(r21), RPT(r22), RPT(r23),
+	RPT(r24), RPT(r25), RPT(r26), RPT(r27),
+	RPT(r28), RPT(r29), RPT(r30), RPT(r31)
+};
+
+static u16 fr_info[32]={
+	0,			/* constant : WE SHOULD NEVER GET THIS */
+	0,			/* constant : WE SHOULD NEVER GET THIS */
+
+	RSW(f2), RSW(f3), RSW(f4), RSW(f5),
+
+	RPT(f6), RPT(f7), RPT(f8), RPT(f9),
+	RPT(f10), RPT(f11),
+
+	RSW(f12), RSW(f13), RSW(f14),
+	RSW(f15), RSW(f16), RSW(f17), RSW(f18), RSW(f19),
+	RSW(f20), RSW(f21), RSW(f22), RSW(f23), RSW(f24),
+	RSW(f25), RSW(f26), RSW(f27), RSW(f28), RSW(f29),
+	RSW(f30), RSW(f31)
+};
+
+/* Invalidate ALAT entry for integer register REGNO.  */
+static void
+invala_gr (int regno)
+{
+#	define F(reg)	case reg: ia64_invala_gr(reg); break
+
+	switch (regno) {
+		F(  0); F(  1); F(  2); F(  3); F(  4); F(  5); F(  6); F(  7);
+		F(  8); F(  9); F( 10); F( 11); F( 12); F( 13); F( 14); F( 15);
+		F( 16); F( 17); F( 18); F( 19); F( 20); F( 21); F( 22); F( 23);
+		F( 24); F( 25); F( 26); F( 27); F( 28); F( 29); F( 30); F( 31);
+		F( 32); F( 33); F( 34); F( 35); F( 36); F( 37); F( 38); F( 39);
+		F( 40); F( 41); F( 42); F( 43); F( 44); F( 45); F( 46); F( 47);
+		F( 48); F( 49); F( 50); F( 51); F( 52); F( 53); F( 54); F( 55);
+		F( 56); F( 57); F( 58); F( 59); F( 60); F( 61); F( 62); F( 63);
+		F( 64); F( 65); F( 66); F( 67); F( 68); F( 69); F( 70); F( 71);
+		F( 72); F( 73); F( 74); F( 75); F( 76); F( 77); F( 78); F( 79);
+		F( 80); F( 81); F( 82); F( 83); F( 84); F( 85); F( 86); F( 87);
+		F( 88); F( 89); F( 90); F( 91); F( 92); F( 93); F( 94); F( 95);
+		F( 96); F( 97); F( 98); F( 99); F(100); F(101); F(102); F(103);
+		F(104); F(105); F(106); F(107); F(108); F(109); F(110); F(111);
+		F(112); F(113); F(114); F(115); F(116); F(117); F(118); F(119);
+		F(120); F(121); F(122); F(123); F(124); F(125); F(126); F(127);
+	}
+#	undef F
+}
+
+/* Invalidate ALAT entry for floating-point register REGNO.  */
+static void
+invala_fr (int regno)
+{
+#	define F(reg)	case reg: ia64_invala_fr(reg); break
+
+	switch (regno) {
+		F(  0); F(  1); F(  2); F(  3); F(  4); F(  5); F(  6); F(  7);
+		F(  8); F(  9); F( 10); F( 11); F( 12); F( 13); F( 14); F( 15);
+		F( 16); F( 17); F( 18); F( 19); F( 20); F( 21); F( 22); F( 23);
+		F( 24); F( 25); F( 26); F( 27); F( 28); F( 29); F( 30); F( 31);
+		F( 32); F( 33); F( 34); F( 35); F( 36); F( 37); F( 38); F( 39);
+		F( 40); F( 41); F( 42); F( 43); F( 44); F( 45); F( 46); F( 47);
+		F( 48); F( 49); F( 50); F( 51); F( 52); F( 53); F( 54); F( 55);
+		F( 56); F( 57); F( 58); F( 59); F( 60); F( 61); F( 62); F( 63);
+		F( 64); F( 65); F( 66); F( 67); F( 68); F( 69); F( 70); F( 71);
+		F( 72); F( 73); F( 74); F( 75); F( 76); F( 77); F( 78); F( 79);
+		F( 80); F( 81); F( 82); F( 83); F( 84); F( 85); F( 86); F( 87);
+		F( 88); F( 89); F( 90); F( 91); F( 92); F( 93); F( 94); F( 95);
+		F( 96); F( 97); F( 98); F( 99); F(100); F(101); F(102); F(103);
+		F(104); F(105); F(106); F(107); F(108); F(109); F(110); F(111);
+		F(112); F(113); F(114); F(115); F(116); F(117); F(118); F(119);
+		F(120); F(121); F(122); F(123); F(124); F(125); F(126); F(127);
+	}
+#	undef F
+}
+
+static inline unsigned long
+rotate_reg (unsigned long sor, unsigned long rrb, unsigned long reg)
+{
+	reg += rrb;
+	if (reg >= sor)
+		reg -= sor;
+	return reg;
+}
+
+static void
+set_rse_reg (struct pt_regs *regs, unsigned long r1, unsigned long val, int nat)
+{
+	struct switch_stack *sw = (struct switch_stack *) regs - 1;
+	unsigned long *bsp, *bspstore, *addr, *rnat_addr, *ubs_end;
+	unsigned long *kbs = (void *) current + IA64_RBS_OFFSET;
+	unsigned long rnats, nat_mask;
+	unsigned long on_kbs;
+	long sof = (regs->cr_ifs) & 0x7f;
+	long sor = 8 * ((regs->cr_ifs >> 14) & 0xf);
+	long rrb_gr = (regs->cr_ifs >> 18) & 0x7f;
+	long ridx = r1 - 32;
+
+	if (ridx >= sof) {
+		/* this should never happen, as the "rsvd register fault" has higher priority */
+		DPRINT("ignoring write to r%lu; only %lu registers are allocated!\n", r1, sof);
+		return;
+	}
+
+	if (ridx < sor)
+		ridx = rotate_reg(sor, rrb_gr, ridx);
+
+	DPRINT("r%lu, sw.bspstore=%lx pt.bspstore=%lx sof=%ld sol=%ld ridx=%ld\n",
+	       r1, sw->ar_bspstore, regs->ar_bspstore, sof, (regs->cr_ifs >> 7) & 0x7f, ridx);
+
+	on_kbs = ia64_rse_num_regs(kbs, (unsigned long *) sw->ar_bspstore);
+	addr = ia64_rse_skip_regs((unsigned long *) sw->ar_bspstore, -sof + ridx);
+	if (addr >= kbs) {
+		/* the register is on the kernel backing store: easy... */
+		rnat_addr = ia64_rse_rnat_addr(addr);
+		if ((unsigned long) rnat_addr >= sw->ar_bspstore)
+			rnat_addr = &sw->ar_rnat;
+		nat_mask = 1UL << ia64_rse_slot_num(addr);
+
+		*addr = val;
+		if (nat)
+			*rnat_addr |=  nat_mask;
+		else
+			*rnat_addr &= ~nat_mask;
+		return;
+	}
+
+	if (!user_stack(current, regs)) {
+		DPRINT("ignoring kernel write to r%lu; register isn't on the kernel RBS!", r1);
+		return;
+	}
+
+	bspstore = (unsigned long *)regs->ar_bspstore;
+	ubs_end = ia64_rse_skip_regs(bspstore, on_kbs);
+	bsp     = ia64_rse_skip_regs(ubs_end, -sof);
+	addr    = ia64_rse_skip_regs(bsp, ridx);
+
+	DPRINT("ubs_end=%p bsp=%p addr=%p\n", (void *) ubs_end, (void *) bsp, (void *) addr);
+
+	ia64_poke(current, sw, (unsigned long) ubs_end, (unsigned long) addr, val);
+
+	rnat_addr = ia64_rse_rnat_addr(addr);
+
+	ia64_peek(current, sw, (unsigned long) ubs_end, (unsigned long) rnat_addr, &rnats);
+	DPRINT("rnat @%p = 0x%lx nat=%d old nat=%ld\n",
+	       (void *) rnat_addr, rnats, nat, (rnats >> ia64_rse_slot_num(addr)) & 1);
+
+	nat_mask = 1UL << ia64_rse_slot_num(addr);
+	if (nat)
+		rnats |=  nat_mask;
+	else
+		rnats &= ~nat_mask;
+	ia64_poke(current, sw, (unsigned long) ubs_end, (unsigned long) rnat_addr, rnats);
+
+	DPRINT("rnat changed to @%p = 0x%lx\n", (void *) rnat_addr, rnats);
+}
+
+
+static void
+get_rse_reg (struct pt_regs *regs, unsigned long r1, unsigned long *val, int *nat)
+{
+	struct switch_stack *sw = (struct switch_stack *) regs - 1;
+	unsigned long *bsp, *addr, *rnat_addr, *ubs_end, *bspstore;
+	unsigned long *kbs = (void *) current + IA64_RBS_OFFSET;
+	unsigned long rnats, nat_mask;
+	unsigned long on_kbs;
+	long sof = (regs->cr_ifs) & 0x7f;
+	long sor = 8 * ((regs->cr_ifs >> 14) & 0xf);
+	long rrb_gr = (regs->cr_ifs >> 18) & 0x7f;
+	long ridx = r1 - 32;
+
+	if (ridx >= sof) {
+		/* read of out-of-frame register returns an undefined value; 0 in our case.  */
+		DPRINT("ignoring read from r%lu; only %lu registers are allocated!\n", r1, sof);
+		goto fail;
+	}
+
+	if (ridx < sor)
+		ridx = rotate_reg(sor, rrb_gr, ridx);
+
+	DPRINT("r%lu, sw.bspstore=%lx pt.bspstore=%lx sof=%ld sol=%ld ridx=%ld\n",
+	       r1, sw->ar_bspstore, regs->ar_bspstore, sof, (regs->cr_ifs >> 7) & 0x7f, ridx);
+
+	on_kbs = ia64_rse_num_regs(kbs, (unsigned long *) sw->ar_bspstore);
+	addr = ia64_rse_skip_regs((unsigned long *) sw->ar_bspstore, -sof + ridx);
+	if (addr >= kbs) {
+		/* the register is on the kernel backing store: easy... */
+		*val = *addr;
+		if (nat) {
+			rnat_addr = ia64_rse_rnat_addr(addr);
+			if ((unsigned long) rnat_addr >= sw->ar_bspstore)
+				rnat_addr = &sw->ar_rnat;
+			nat_mask = 1UL << ia64_rse_slot_num(addr);
+			*nat = (*rnat_addr & nat_mask) != 0;
+		}
+		return;
+	}
+
+	if (!user_stack(current, regs)) {
+		DPRINT("ignoring kernel read of r%lu; register isn't on the RBS!", r1);
+		goto fail;
+	}
+
+	bspstore = (unsigned long *)regs->ar_bspstore;
+	ubs_end = ia64_rse_skip_regs(bspstore, on_kbs);
+	bsp     = ia64_rse_skip_regs(ubs_end, -sof);
+	addr    = ia64_rse_skip_regs(bsp, ridx);
+
+	DPRINT("ubs_end=%p bsp=%p addr=%p\n", (void *) ubs_end, (void *) bsp, (void *) addr);
+
+	ia64_peek(current, sw, (unsigned long) ubs_end, (unsigned long) addr, val);
+
+	if (nat) {
+		rnat_addr = ia64_rse_rnat_addr(addr);
+		nat_mask = 1UL << ia64_rse_slot_num(addr);
+
+		DPRINT("rnat @%p = 0x%lx\n", (void *) rnat_addr, rnats);
+
+		ia64_peek(current, sw, (unsigned long) ubs_end, (unsigned long) rnat_addr, &rnats);
+		*nat = (rnats & nat_mask) != 0;
+	}
+	return;
+
+  fail:
+	*val = 0;
+	if (nat)
+		*nat = 0;
+	return;
+}
+
+
+static void
+setreg (unsigned long regnum, unsigned long val, int nat, struct pt_regs *regs)
+{
+	struct switch_stack *sw = (struct switch_stack *) regs - 1;
+	unsigned long addr;
+	unsigned long bitmask;
+	unsigned long *unat;
+
+	/*
+	 * First takes care of stacked registers
+	 */
+	if (regnum >= IA64_FIRST_STACKED_GR) {
+		set_rse_reg(regs, regnum, val, nat);
+		return;
+	}
+
+	/*
+	 * Using r0 as a target raises a General Exception fault which has higher priority
+	 * than the Unaligned Reference fault.
+	 */
+
+	/*
+	 * Now look at registers in [0-31] range and init correct UNAT
+	 */
+	if (GR_IN_SW(regnum)) {
+		addr = (unsigned long)sw;
+		unat = &sw->ar_unat;
+	} else {
+		addr = (unsigned long)regs;
+		unat = &sw->caller_unat;
+	}
+	DPRINT("tmp_base=%lx switch_stack=%s offset=%d\n",
+	       addr, unat==&sw->ar_unat ? "yes":"no", GR_OFFS(regnum));
+	/*
+	 * add offset from base of struct
+	 * and do it !
+	 */
+	addr += GR_OFFS(regnum);
+
+	*(unsigned long *)addr = val;
+
+	/*
+	 * We need to clear the corresponding UNAT bit to fully emulate the load
+	 * UNAT bit_pos = GR[r3]{8:3} form EAS-2.4
+	 */
+	bitmask   = 1UL << (addr >> 3 & 0x3f);
+	DPRINT("*0x%lx=0x%lx NaT=%d prev_unat @%p=%lx\n", addr, val, nat, (void *) unat, *unat);
+	if (nat) {
+		*unat |= bitmask;
+	} else {
+		*unat &= ~bitmask;
+	}
+	DPRINT("*0x%lx=0x%lx NaT=%d new unat: %p=%lx\n", addr, val, nat, (void *) unat,*unat);
+}
+
+/*
+ * Return the (rotated) index for floating point register REGNUM (REGNUM must be in the
+ * range from 32-127, result is in the range from 0-95.
+ */
+static inline unsigned long
+fph_index (struct pt_regs *regs, long regnum)
+{
+	unsigned long rrb_fr = (regs->cr_ifs >> 25) & 0x7f;
+	return rotate_reg(96, rrb_fr, (regnum - IA64_FIRST_ROTATING_FR));
+}
+
+static void
+setfpreg (unsigned long regnum, struct ia64_fpreg *fpval, struct pt_regs *regs)
+{
+	struct switch_stack *sw = (struct switch_stack *)regs - 1;
+	unsigned long addr;
+
+	/*
+	 * From EAS-2.5: FPDisableFault has higher priority than Unaligned
+	 * Fault. Thus, when we get here, we know the partition is enabled.
+	 * To update f32-f127, there are three choices:
+	 *
+	 *	(1) save f32-f127 to thread.fph and update the values there
+	 *	(2) use a gigantic switch statement to directly access the registers
+	 *	(3) generate code on the fly to update the desired register
+	 *
+	 * For now, we are using approach (1).
+	 */
+	if (regnum >= IA64_FIRST_ROTATING_FR) {
+		ia64_sync_fph(current);
+		current->thread.fph[fph_index(regs, regnum)] = *fpval;
+	} else {
+		/*
+		 * pt_regs or switch_stack ?
+		 */
+		if (FR_IN_SW(regnum)) {
+			addr = (unsigned long)sw;
+		} else {
+			addr = (unsigned long)regs;
+		}
+
+		DPRINT("tmp_base=%lx offset=%d\n", addr, FR_OFFS(regnum));
+
+		addr += FR_OFFS(regnum);
+		*(struct ia64_fpreg *)addr = *fpval;
+
+		/*
+		 * mark the low partition as being used now
+		 *
+		 * It is highly unlikely that this bit is not already set, but
+		 * let's do it for safety.
+		 */
+		regs->cr_ipsr |= IA64_PSR_MFL;
+	}
+}
+
+/*
+ * Those 2 inline functions generate the spilled versions of the constant floating point
+ * registers which can be used with stfX
+ */
+static inline void
+float_spill_f0 (struct ia64_fpreg *final)
+{
+	ia64_stf_spill(final, 0);
+}
+
+static inline void
+float_spill_f1 (struct ia64_fpreg *final)
+{
+	ia64_stf_spill(final, 1);
+}
+
+static void
+getfpreg (unsigned long regnum, struct ia64_fpreg *fpval, struct pt_regs *regs)
+{
+	struct switch_stack *sw = (struct switch_stack *) regs - 1;
+	unsigned long addr;
+
+	/*
+	 * From EAS-2.5: FPDisableFault has higher priority than
+	 * Unaligned Fault. Thus, when we get here, we know the partition is
+	 * enabled.
+	 *
+	 * When regnum > 31, the register is still live and we need to force a save
+	 * to current->thread.fph to get access to it.  See discussion in setfpreg()
+	 * for reasons and other ways of doing this.
+	 */
+	if (regnum >= IA64_FIRST_ROTATING_FR) {
+		ia64_flush_fph(current);
+		*fpval = current->thread.fph[fph_index(regs, regnum)];
+	} else {
+		/*
+		 * f0 = 0.0, f1= 1.0. Those registers are constant and are thus
+		 * not saved, we must generate their spilled form on the fly
+		 */
+		switch(regnum) {
+		case 0:
+			float_spill_f0(fpval);
+			break;
+		case 1:
+			float_spill_f1(fpval);
+			break;
+		default:
+			/*
+			 * pt_regs or switch_stack ?
+			 */
+			addr =  FR_IN_SW(regnum) ? (unsigned long)sw
+						 : (unsigned long)regs;
+
+			DPRINT("is_sw=%d tmp_base=%lx offset=0x%x\n",
+			       FR_IN_SW(regnum), addr, FR_OFFS(regnum));
+
+			addr  += FR_OFFS(regnum);
+			*fpval = *(struct ia64_fpreg *)addr;
+		}
+	}
+}
+
+
+static void
+getreg (unsigned long regnum, unsigned long *val, int *nat, struct pt_regs *regs)
+{
+	struct switch_stack *sw = (struct switch_stack *) regs - 1;
+	unsigned long addr, *unat;
+
+	if (regnum >= IA64_FIRST_STACKED_GR) {
+		get_rse_reg(regs, regnum, val, nat);
+		return;
+	}
+
+	/*
+	 * take care of r0 (read-only always evaluate to 0)
+	 */
+	if (regnum == 0) {
+		*val = 0;
+		if (nat)
+			*nat = 0;
+		return;
+	}
+
+	/*
+	 * Now look at registers in [0-31] range and init correct UNAT
+	 */
+	if (GR_IN_SW(regnum)) {
+		addr = (unsigned long)sw;
+		unat = &sw->ar_unat;
+	} else {
+		addr = (unsigned long)regs;
+		unat = &sw->caller_unat;
+	}
+
+	DPRINT("addr_base=%lx offset=0x%x\n", addr,  GR_OFFS(regnum));
+
+	addr += GR_OFFS(regnum);
+
+	*val  = *(unsigned long *)addr;
+
+	/*
+	 * do it only when requested
+	 */
+	if (nat)
+		*nat  = (*unat >> (addr >> 3 & 0x3f)) & 0x1UL;
+}
+
+static void
+emulate_load_updates (update_t type, load_store_t ld, struct pt_regs *regs, unsigned long ifa)
+{
+	/*
+	 * IMPORTANT:
+	 * Given the way we handle unaligned speculative loads, we should
+	 * not get to this point in the code but we keep this sanity check,
+	 * just in case.
+	 */
+	if (ld.x6_op == 1 || ld.x6_op == 3) {
+		printk(KERN_ERR "%s: register update on speculative load, error\n", __func__);
+		if (die_if_kernel("unaligned reference on speculative load with register update\n",
+				  regs, 30))
+			return;
+	}
+
+
+	/*
+	 * at this point, we know that the base register to update is valid i.e.,
+	 * it's not r0
+	 */
+	if (type == UPD_IMMEDIATE) {
+		unsigned long imm;
+
+		/*
+		 * Load +Imm: ldXZ r1=[r3],imm(9)
+		 *
+		 *
+		 * form imm9: [13:19] contain the first 7 bits
+		 */
+		imm = ld.x << 7 | ld.imm;
+
+		/*
+		 * sign extend (1+8bits) if m set
+		 */
+		if (ld.m) imm |= SIGN_EXT9;
+
+		/*
+		 * ifa == r3 and we know that the NaT bit on r3 was clear so
+		 * we can directly use ifa.
+		 */
+		ifa += imm;
+
+		setreg(ld.r3, ifa, 0, regs);
+
+		DPRINT("ld.x=%d ld.m=%d imm=%ld r3=0x%lx\n", ld.x, ld.m, imm, ifa);
+
+	} else if (ld.m) {
+		unsigned long r2;
+		int nat_r2;
+
+		/*
+		 * Load +Reg Opcode: ldXZ r1=[r3],r2
+		 *
+		 * Note: that we update r3 even in the case of ldfX.a
+		 * (where the load does not happen)
+		 *
+		 * The way the load algorithm works, we know that r3 does not
+		 * have its NaT bit set (would have gotten NaT consumption
+		 * before getting the unaligned fault). So we can use ifa
+		 * which equals r3 at this point.
+		 *
+		 * IMPORTANT:
+		 * The above statement holds ONLY because we know that we
+		 * never reach this code when trying to do a ldX.s.
+		 * If we ever make it to here on an ldfX.s then
+		 */
+		getreg(ld.imm, &r2, &nat_r2, regs);
+
+		ifa += r2;
+
+		/*
+		 * propagate Nat r2 -> r3
+		 */
+		setreg(ld.r3, ifa, nat_r2, regs);
+
+		DPRINT("imm=%d r2=%ld r3=0x%lx nat_r2=%d\n",ld.imm, r2, ifa, nat_r2);
+	}
+}
+
+static int emulate_store(unsigned long ifa, void *val, int len, bool kernel_mode)
+{
+	if (kernel_mode)
+		return copy_to_kernel_nofault((void *)ifa, val, len);
+
+	return copy_to_user((void __user *)ifa, val, len);
+}
+
+static int emulate_load(void *val, unsigned long ifa, int len, bool kernel_mode)
+{
+	if (kernel_mode)
+	       return copy_from_kernel_nofault(val, (void *)ifa, len);
+
+	return copy_from_user(val, (void __user *)ifa, len);
+}
+
+static int
+emulate_load_int (unsigned long ifa, load_store_t ld, struct pt_regs *regs,
+		  bool kernel_mode)
+{
+	unsigned int len = 1 << ld.x6_sz;
+	unsigned long val = 0;
+
+	/*
+	 * r0, as target, doesn't need to be checked because Illegal Instruction
+	 * faults have higher priority than unaligned faults.
+	 *
+	 * r0 cannot be found as the base as it would never generate an
+	 * unaligned reference.
+	 */
+
+	/*
+	 * ldX.a we will emulate load and also invalidate the ALAT entry.
+	 * See comment below for explanation on how we handle ldX.a
+	 */
+
+	if (len != 2 && len != 4 && len != 8) {
+		DPRINT("unknown size: x6=%d\n", ld.x6_sz);
+		return -1;
+	}
+	/* this assumes little-endian byte-order: */
+	if (emulate_load(&val, ifa, len, kernel_mode))
+		return -1;
+	setreg(ld.r1, val, 0, regs);
+
+	/*
+	 * check for updates on any kind of loads
+	 */
+	if (ld.op == 0x5 || ld.m)
+		emulate_load_updates(ld.op == 0x5 ? UPD_IMMEDIATE: UPD_REG, ld, regs, ifa);
+
+	/*
+	 * handling of various loads (based on EAS2.4):
+	 *
+	 * ldX.acq (ordered load):
+	 *	- acquire semantics would have been used, so force fence instead.
+	 *
+	 * ldX.c.clr (check load and clear):
+	 *	- if we get to this handler, it's because the entry was not in the ALAT.
+	 *	  Therefore the operation reverts to a normal load
+	 *
+	 * ldX.c.nc (check load no clear):
+	 *	- same as previous one
+	 *
+	 * ldX.c.clr.acq (ordered check load and clear):
+	 *	- same as above for c.clr part. The load needs to have acquire semantics. So
+	 *	  we use the fence semantics which is stronger and thus ensures correctness.
+	 *
+	 * ldX.a (advanced load):
+	 *	- suppose ldX.a r1=[r3]. If we get to the unaligned trap it's because the
+	 *	  address doesn't match requested size alignment. This means that we would
+	 *	  possibly need more than one load to get the result.
+	 *
+	 *	  The load part can be handled just like a normal load, however the difficult
+	 *	  part is to get the right thing into the ALAT. The critical piece of information
+	 *	  in the base address of the load & size. To do that, a ld.a must be executed,
+	 *	  clearly any address can be pushed into the table by using ld1.a r1=[r3]. Now
+	 *	  if we use the same target register, we will be okay for the check.a instruction.
+	 *	  If we look at the store, basically a stX [r3]=r1 checks the ALAT  for any entry
+	 *	  which would overlap within [r3,r3+X] (the size of the load was store in the
+	 *	  ALAT). If such an entry is found the entry is invalidated. But this is not good
+	 *	  enough, take the following example:
+	 *		r3=3
+	 *		ld4.a r1=[r3]
+	 *
+	 *	  Could be emulated by doing:
+	 *		ld1.a r1=[r3],1
+	 *		store to temporary;
+	 *		ld1.a r1=[r3],1
+	 *		store & shift to temporary;
+	 *		ld1.a r1=[r3],1
+	 *		store & shift to temporary;
+	 *		ld1.a r1=[r3]
+	 *		store & shift to temporary;
+	 *		r1=temporary
+	 *
+	 *	  So in this case, you would get the right value is r1 but the wrong info in
+	 *	  the ALAT.  Notice that you could do it in reverse to finish with address 3
+	 *	  but you would still get the size wrong.  To get the size right, one needs to
+	 *	  execute exactly the same kind of load. You could do it from a aligned
+	 *	  temporary location, but you would get the address wrong.
+	 *
+	 *	  So no matter what, it is not possible to emulate an advanced load
+	 *	  correctly. But is that really critical ?
+	 *
+	 *	  We will always convert ld.a into a normal load with ALAT invalidated.  This
+	 *	  will enable compiler to do optimization where certain code path after ld.a
+	 *	  is not required to have ld.c/chk.a, e.g., code path with no intervening stores.
+	 *
+	 *	  If there is a store after the advanced load, one must either do a ld.c.* or
+	 *	  chk.a.* to reuse the value stored in the ALAT. Both can "fail" (meaning no
+	 *	  entry found in ALAT), and that's perfectly ok because:
+	 *
+	 *		- ld.c.*, if the entry is not present a  normal load is executed
+	 *		- chk.a.*, if the entry is not present, execution jumps to recovery code
+	 *
+	 *	  In either case, the load can be potentially retried in another form.
+	 *
+	 *	  ALAT must be invalidated for the register (so that chk.a or ld.c don't pick
+	 *	  up a stale entry later). The register base update MUST also be performed.
+	 */
+
+	/*
+	 * when the load has the .acq completer then
+	 * use ordering fence.
+	 */
+	if (ld.x6_op == 0x5 || ld.x6_op == 0xa)
+		mb();
+
+	/*
+	 * invalidate ALAT entry in case of advanced load
+	 */
+	if (ld.x6_op == 0x2)
+		invala_gr(ld.r1);
+
+	return 0;
+}
+
+static int
+emulate_store_int (unsigned long ifa, load_store_t ld, struct pt_regs *regs,
+		   bool kernel_mode)
+{
+	unsigned long r2;
+	unsigned int len = 1 << ld.x6_sz;
+
+	/*
+	 * if we get to this handler, Nat bits on both r3 and r2 have already
+	 * been checked. so we don't need to do it
+	 *
+	 * extract the value to be stored
+	 */
+	getreg(ld.imm, &r2, NULL, regs);
+
+	/*
+	 * we rely on the macros in unaligned.h for now i.e.,
+	 * we let the compiler figure out how to read memory gracefully.
+	 *
+	 * We need this switch/case because the way the inline function
+	 * works. The code is optimized by the compiler and looks like
+	 * a single switch/case.
+	 */
+	DPRINT("st%d [%lx]=%lx\n", len, ifa, r2);
+
+	if (len != 2 && len != 4 && len != 8) {
+		DPRINT("unknown size: x6=%d\n", ld.x6_sz);
+		return -1;
+	}
+
+	/* this assumes little-endian byte-order: */
+	if (emulate_store(ifa, &r2, len, kernel_mode))
+		return -1;
+
+	/*
+	 * stX [r3]=r2,imm(9)
+	 *
+	 * NOTE:
+	 * ld.r3 can never be r0, because r0 would not generate an
+	 * unaligned access.
+	 */
+	if (ld.op == 0x5) {
+		unsigned long imm;
+
+		/*
+		 * form imm9: [12:6] contain first 7bits
+		 */
+		imm = ld.x << 7 | ld.r1;
+		/*
+		 * sign extend (8bits) if m set
+		 */
+		if (ld.m) imm |= SIGN_EXT9;
+		/*
+		 * ifa == r3 (NaT is necessarily cleared)
+		 */
+		ifa += imm;
+
+		DPRINT("imm=%lx r3=%lx\n", imm, ifa);
+
+		setreg(ld.r3, ifa, 0, regs);
+	}
+	/*
+	 * we don't have alat_invalidate_multiple() so we need
+	 * to do the complete flush :-<<
+	 */
+	ia64_invala();
+
+	/*
+	 * stX.rel: use fence instead of release
+	 */
+	if (ld.x6_op == 0xd)
+		mb();
+
+	return 0;
+}
+
+/*
+ * floating point operations sizes in bytes
+ */
+static const unsigned char float_fsz[4]={
+	10, /* extended precision (e) */
+	8,  /* integer (8)            */
+	4,  /* single precision (s)   */
+	8   /* double precision (d)   */
+};
+
+static inline void
+mem2float_extended (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldfe(6, init);
+	ia64_stop();
+	ia64_stf_spill(final, 6);
+}
+
+static inline void
+mem2float_integer (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldf8(6, init);
+	ia64_stop();
+	ia64_stf_spill(final, 6);
+}
+
+static inline void
+mem2float_single (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldfs(6, init);
+	ia64_stop();
+	ia64_stf_spill(final, 6);
+}
+
+static inline void
+mem2float_double (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldfd(6, init);
+	ia64_stop();
+	ia64_stf_spill(final, 6);
+}
+
+static inline void
+float2mem_extended (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldf_fill(6, init);
+	ia64_stop();
+	ia64_stfe(final, 6);
+}
+
+static inline void
+float2mem_integer (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldf_fill(6, init);
+	ia64_stop();
+	ia64_stf8(final, 6);
+}
+
+static inline void
+float2mem_single (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldf_fill(6, init);
+	ia64_stop();
+	ia64_stfs(final, 6);
+}
+
+static inline void
+float2mem_double (struct ia64_fpreg *init, struct ia64_fpreg *final)
+{
+	ia64_ldf_fill(6, init);
+	ia64_stop();
+	ia64_stfd(final, 6);
+}
+
+static int
+emulate_load_floatpair (unsigned long ifa, load_store_t ld, struct pt_regs *regs, bool kernel_mode)
+{
+	struct ia64_fpreg fpr_init[2];
+	struct ia64_fpreg fpr_final[2];
+	unsigned long len = float_fsz[ld.x6_sz];
+
+	/*
+	 * fr0 & fr1 don't need to be checked because Illegal Instruction faults have
+	 * higher priority than unaligned faults.
+	 *
+	 * r0 cannot be found as the base as it would never generate an unaligned
+	 * reference.
+	 */
+
+	/*
+	 * make sure we get clean buffers
+	 */
+	memset(&fpr_init, 0, sizeof(fpr_init));
+	memset(&fpr_final, 0, sizeof(fpr_final));
+
+	/*
+	 * ldfpX.a: we don't try to emulate anything but we must
+	 * invalidate the ALAT entry and execute updates, if any.
+	 */
+	if (ld.x6_op != 0x2) {
+		/*
+		 * This assumes little-endian byte-order.  Note that there is no "ldfpe"
+		 * instruction:
+		 */
+		if (emulate_load(&fpr_init[0], ifa, len, kernel_mode)
+		    || emulate_load(&fpr_init[1], (ifa + len), len, kernel_mode))
+			return -1;
+
+		DPRINT("ld.r1=%d ld.imm=%d x6_sz=%d\n", ld.r1, ld.imm, ld.x6_sz);
+		DDUMP("frp_init =", &fpr_init, 2*len);
+		/*
+		 * XXX fixme
+		 * Could optimize inlines by using ldfpX & 2 spills
+		 */
+		switch( ld.x6_sz ) {
+			case 0:
+				mem2float_extended(&fpr_init[0], &fpr_final[0]);
+				mem2float_extended(&fpr_init[1], &fpr_final[1]);
+				break;
+			case 1:
+				mem2float_integer(&fpr_init[0], &fpr_final[0]);
+				mem2float_integer(&fpr_init[1], &fpr_final[1]);
+				break;
+			case 2:
+				mem2float_single(&fpr_init[0], &fpr_final[0]);
+				mem2float_single(&fpr_init[1], &fpr_final[1]);
+				break;
+			case 3:
+				mem2float_double(&fpr_init[0], &fpr_final[0]);
+				mem2float_double(&fpr_init[1], &fpr_final[1]);
+				break;
+		}
+		DDUMP("fpr_final =", &fpr_final, 2*len);
+		/*
+		 * XXX fixme
+		 *
+		 * A possible optimization would be to drop fpr_final and directly
+		 * use the storage from the saved context i.e., the actual final
+		 * destination (pt_regs, switch_stack or thread structure).
+		 */
+		setfpreg(ld.r1, &fpr_final[0], regs);
+		setfpreg(ld.imm, &fpr_final[1], regs);
+	}
+
+	/*
+	 * Check for updates: only immediate updates are available for this
+	 * instruction.
+	 */
+	if (ld.m) {
+		/*
+		 * the immediate is implicit given the ldsz of the operation:
+		 * single: 8 (2x4) and for  all others it's 16 (2x8)
+		 */
+		ifa += len<<1;
+
+		/*
+		 * IMPORTANT:
+		 * the fact that we force the NaT of r3 to zero is ONLY valid
+		 * as long as we don't come here with a ldfpX.s.
+		 * For this reason we keep this sanity check
+		 */
+		if (ld.x6_op == 1 || ld.x6_op == 3)
+			printk(KERN_ERR "%s: register update on speculative load pair, error\n",
+			       __func__);
+
+		setreg(ld.r3, ifa, 0, regs);
+	}
+
+	/*
+	 * Invalidate ALAT entries, if any, for both registers.
+	 */
+	if (ld.x6_op == 0x2) {
+		invala_fr(ld.r1);
+		invala_fr(ld.imm);
+	}
+	return 0;
+}
+
+
+static int
+emulate_load_float (unsigned long ifa, load_store_t ld, struct pt_regs *regs,
+	            bool kernel_mode)
+{
+	struct ia64_fpreg fpr_init;
+	struct ia64_fpreg fpr_final;
+	unsigned long len = float_fsz[ld.x6_sz];
+
+	/*
+	 * fr0 & fr1 don't need to be checked because Illegal Instruction
+	 * faults have higher priority than unaligned faults.
+	 *
+	 * r0 cannot be found as the base as it would never generate an
+	 * unaligned reference.
+	 */
+
+	/*
+	 * make sure we get clean buffers
+	 */
+	memset(&fpr_init,0, sizeof(fpr_init));
+	memset(&fpr_final,0, sizeof(fpr_final));
+
+	/*
+	 * ldfX.a we don't try to emulate anything but we must
+	 * invalidate the ALAT entry.
+	 * See comments in ldX for descriptions on how the various loads are handled.
+	 */
+	if (ld.x6_op != 0x2) {
+		if (emulate_load(&fpr_init, ifa, len, kernel_mode))
+			return -1;
+
+		DPRINT("ld.r1=%d x6_sz=%d\n", ld.r1, ld.x6_sz);
+		DDUMP("fpr_init =", &fpr_init, len);
+		/*
+		 * we only do something for x6_op={0,8,9}
+		 */
+		switch( ld.x6_sz ) {
+			case 0:
+				mem2float_extended(&fpr_init, &fpr_final);
+				break;
+			case 1:
+				mem2float_integer(&fpr_init, &fpr_final);
+				break;
+			case 2:
+				mem2float_single(&fpr_init, &fpr_final);
+				break;
+			case 3:
+				mem2float_double(&fpr_init, &fpr_final);
+				break;
+		}
+		DDUMP("fpr_final =", &fpr_final, len);
+		/*
+		 * XXX fixme
+		 *
+		 * A possible optimization would be to drop fpr_final and directly
+		 * use the storage from the saved context i.e., the actual final
+		 * destination (pt_regs, switch_stack or thread structure).
+		 */
+		setfpreg(ld.r1, &fpr_final, regs);
+	}
+
+	/*
+	 * check for updates on any loads
+	 */
+	if (ld.op == 0x7 || ld.m)
+		emulate_load_updates(ld.op == 0x7 ? UPD_IMMEDIATE: UPD_REG, ld, regs, ifa);
+
+	/*
+	 * invalidate ALAT entry in case of advanced floating point loads
+	 */
+	if (ld.x6_op == 0x2)
+		invala_fr(ld.r1);
+
+	return 0;
+}
+
+
+static int
+emulate_store_float (unsigned long ifa, load_store_t ld, struct pt_regs *regs,
+		     bool kernel_mode)
+{
+	struct ia64_fpreg fpr_init;
+	struct ia64_fpreg fpr_final;
+	unsigned long len = float_fsz[ld.x6_sz];
+
+	/*
+	 * make sure we get clean buffers
+	 */
+	memset(&fpr_init,0, sizeof(fpr_init));
+	memset(&fpr_final,0, sizeof(fpr_final));
+
+	/*
+	 * if we get to this handler, Nat bits on both r3 and r2 have already
+	 * been checked. so we don't need to do it
+	 *
+	 * extract the value to be stored
+	 */
+	getfpreg(ld.imm, &fpr_init, regs);
+	/*
+	 * during this step, we extract the spilled registers from the saved
+	 * context i.e., we refill. Then we store (no spill) to temporary
+	 * aligned location
+	 */
+	switch( ld.x6_sz ) {
+		case 0:
+			float2mem_extended(&fpr_init, &fpr_final);
+			break;
+		case 1:
+			float2mem_integer(&fpr_init, &fpr_final);
+			break;
+		case 2:
+			float2mem_single(&fpr_init, &fpr_final);
+			break;
+		case 3:
+			float2mem_double(&fpr_init, &fpr_final);
+			break;
+	}
+	DPRINT("ld.r1=%d x6_sz=%d\n", ld.r1, ld.x6_sz);
+	DDUMP("fpr_init =", &fpr_init, len);
+	DDUMP("fpr_final =", &fpr_final, len);
+
+	if (emulate_store(ifa, &fpr_final, len, kernel_mode))
+		return -1;
+
+	/*
+	 * stfX [r3]=r2,imm(9)
+	 *
+	 * NOTE:
+	 * ld.r3 can never be r0, because r0 would not generate an
+	 * unaligned access.
+	 */
+	if (ld.op == 0x7) {
+		unsigned long imm;
+
+		/*
+		 * form imm9: [12:6] contain first 7bits
+		 */
+		imm = ld.x << 7 | ld.r1;
+		/*
+		 * sign extend (8bits) if m set
+		 */
+		if (ld.m)
+			imm |= SIGN_EXT9;
+		/*
+		 * ifa == r3 (NaT is necessarily cleared)
+		 */
+		ifa += imm;
+
+		DPRINT("imm=%lx r3=%lx\n", imm, ifa);
+
+		setreg(ld.r3, ifa, 0, regs);
+	}
+	/*
+	 * we don't have alat_invalidate_multiple() so we need
+	 * to do the complete flush :-<<
+	 */
+	ia64_invala();
+
+	return 0;
+}
+
+/*
+ * Make sure we log the unaligned access, so that user/sysadmin can notice it and
+ * eventually fix the program.  However, we don't want to do that for every access so we
+ * pace it with jiffies.
+ */
+static DEFINE_RATELIMIT_STATE(logging_rate_limit, 5 * HZ, 5);
+
+void
+ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
+{
+	struct ia64_psr *ipsr = ia64_psr(regs);
+	unsigned long bundle[2];
+	unsigned long opcode;
+	const struct exception_table_entry *eh = NULL;
+	union {
+		unsigned long l;
+		load_store_t insn;
+	} u;
+	int ret = -1;
+	bool kernel_mode = false;
+
+	if (ia64_psr(regs)->be) {
+		/* we don't support big-endian accesses */
+		if (die_if_kernel("big-endian unaligned accesses are not supported", regs, 0))
+			return;
+		goto force_sigbus;
+	}
+
+	/*
+	 * Treat kernel accesses for which there is an exception handler entry the same as
+	 * user-level unaligned accesses.  Otherwise, a clever program could trick this
+	 * handler into reading an arbitrary kernel addresses...
+	 */
+	if (!user_mode(regs))
+		eh = search_exception_tables(regs->cr_iip + ia64_psr(regs)->ri);
+	if (user_mode(regs) || eh) {
+		if ((current->thread.flags & IA64_THREAD_UAC_SIGBUS) != 0)
+			goto force_sigbus;
+
+		if (!no_unaligned_warning &&
+		    !(current->thread.flags & IA64_THREAD_UAC_NOPRINT) &&
+		    __ratelimit(&logging_rate_limit))
+		{
+			char buf[200];	/* comm[] is at most 16 bytes... */
+			size_t len;
+
+			len = sprintf(buf, "%s(%d): unaligned access to 0x%016lx, "
+				      "ip=0x%016lx\n\r", current->comm,
+				      task_pid_nr(current),
+				      ifa, regs->cr_iip + ipsr->ri);
+			/*
+			 * Don't call tty_write_message() if we're in the kernel; we might
+			 * be holding locks...
+			 */
+			if (user_mode(regs)) {
+				struct tty_struct *tty = get_current_tty();
+				tty_write_message(tty, buf);
+				tty_kref_put(tty);
+			}
+			buf[len-1] = '\0';	/* drop '\r' */
+			/* watch for command names containing %s */
+			printk(KERN_WARNING "%s", buf);
+		} else {
+			if (no_unaligned_warning) {
+				printk_once(KERN_WARNING "%s(%d) encountered an "
+				       "unaligned exception which required\n"
+				       "kernel assistance, which degrades "
+				       "the performance of the application.\n"
+				       "Unaligned exception warnings have "
+				       "been disabled by the system "
+				       "administrator\n"
+				       "echo 0 > /proc/sys/kernel/ignore-"
+				       "unaligned-usertrap to re-enable\n",
+				       current->comm, task_pid_nr(current));
+			}
+		}
+	} else {
+		if (__ratelimit(&logging_rate_limit)) {
+			printk(KERN_WARNING "kernel unaligned access to 0x%016lx, ip=0x%016lx\n",
+			       ifa, regs->cr_iip + ipsr->ri);
+			if (unaligned_dump_stack)
+				dump_stack();
+		}
+		kernel_mode = true;
+	}
+
+	DPRINT("iip=%lx ifa=%lx isr=%lx (ei=%d, sp=%d)\n",
+	       regs->cr_iip, ifa, regs->cr_ipsr, ipsr->ri, ipsr->it);
+
+	if (emulate_load(bundle, regs->cr_iip, 16, kernel_mode))
+		goto failure;
+
+	/*
+	 * extract the instruction from the bundle given the slot number
+	 */
+	switch (ipsr->ri) {
+	      default:
+	      case 0: u.l = (bundle[0] >>  5); break;
+	      case 1: u.l = (bundle[0] >> 46) | (bundle[1] << 18); break;
+	      case 2: u.l = (bundle[1] >> 23); break;
+	}
+	opcode = (u.l >> IA64_OPCODE_SHIFT) & IA64_OPCODE_MASK;
+
+	DPRINT("opcode=%lx ld.qp=%d ld.r1=%d ld.imm=%d ld.r3=%d ld.x=%d ld.hint=%d "
+	       "ld.x6=0x%x ld.m=%d ld.op=%d\n", opcode, u.insn.qp, u.insn.r1, u.insn.imm,
+	       u.insn.r3, u.insn.x, u.insn.hint, u.insn.x6_sz, u.insn.m, u.insn.op);
+
+	/*
+	 * IMPORTANT:
+	 * Notice that the switch statement DOES not cover all possible instructions
+	 * that DO generate unaligned references. This is made on purpose because for some
+	 * instructions it DOES NOT make sense to try and emulate the access. Sometimes it
+	 * is WRONG to try and emulate. Here is a list of instruction we don't emulate i.e.,
+	 * the program will get a signal and die:
+	 *
+	 *	load/store:
+	 *		- ldX.spill
+	 *		- stX.spill
+	 *	Reason: RNATs are based on addresses
+	 *		- ld16
+	 *		- st16
+	 *	Reason: ld16 and st16 are supposed to occur in a single
+	 *		memory op
+	 *
+	 *	synchronization:
+	 *		- cmpxchg
+	 *		- fetchadd
+	 *		- xchg
+	 *	Reason: ATOMIC operations cannot be emulated properly using multiple
+	 *	        instructions.
+	 *
+	 *	speculative loads:
+	 *		- ldX.sZ
+	 *	Reason: side effects, code must be ready to deal with failure so simpler
+	 *		to let the load fail.
+	 * ---------------------------------------------------------------------------------
+	 * XXX fixme
+	 *
+	 * I would like to get rid of this switch case and do something
+	 * more elegant.
+	 */
+	switch (opcode) {
+	      case LDS_OP:
+	      case LDSA_OP:
+		if (u.insn.x)
+			/* oops, really a semaphore op (cmpxchg, etc) */
+			goto failure;
+		fallthrough;
+	      case LDS_IMM_OP:
+	      case LDSA_IMM_OP:
+	      case LDFS_OP:
+	      case LDFSA_OP:
+	      case LDFS_IMM_OP:
+		/*
+		 * The instruction will be retried with deferred exceptions turned on, and
+		 * we should get Nat bit installed
+		 *
+		 * IMPORTANT: When PSR_ED is set, the register & immediate update forms
+		 * are actually executed even though the operation failed. So we don't
+		 * need to take care of this.
+		 */
+		DPRINT("forcing PSR_ED\n");
+		regs->cr_ipsr |= IA64_PSR_ED;
+		goto done;
+
+	      case LD_OP:
+	      case LDA_OP:
+	      case LDBIAS_OP:
+	      case LDACQ_OP:
+	      case LDCCLR_OP:
+	      case LDCNC_OP:
+	      case LDCCLRACQ_OP:
+		if (u.insn.x)
+			/* oops, really a semaphore op (cmpxchg, etc) */
+			goto failure;
+		fallthrough;
+	      case LD_IMM_OP:
+	      case LDA_IMM_OP:
+	      case LDBIAS_IMM_OP:
+	      case LDACQ_IMM_OP:
+	      case LDCCLR_IMM_OP:
+	      case LDCNC_IMM_OP:
+	      case LDCCLRACQ_IMM_OP:
+		ret = emulate_load_int(ifa, u.insn, regs, kernel_mode);
+		break;
+
+	      case ST_OP:
+	      case STREL_OP:
+		if (u.insn.x)
+			/* oops, really a semaphore op (cmpxchg, etc) */
+			goto failure;
+		fallthrough;
+	      case ST_IMM_OP:
+	      case STREL_IMM_OP:
+		ret = emulate_store_int(ifa, u.insn, regs, kernel_mode);
+		break;
+
+	      case LDF_OP:
+	      case LDFA_OP:
+	      case LDFCCLR_OP:
+	      case LDFCNC_OP:
+		if (u.insn.x)
+			ret = emulate_load_floatpair(ifa, u.insn, regs, kernel_mode);
+		else
+			ret = emulate_load_float(ifa, u.insn, regs, kernel_mode);
+		break;
+
+	      case LDF_IMM_OP:
+	      case LDFA_IMM_OP:
+	      case LDFCCLR_IMM_OP:
+	      case LDFCNC_IMM_OP:
+		ret = emulate_load_float(ifa, u.insn, regs, kernel_mode);
+		break;
+
+	      case STF_OP:
+	      case STF_IMM_OP:
+		ret = emulate_store_float(ifa, u.insn, regs, kernel_mode);
+		break;
+
+	      default:
+		goto failure;
+	}
+	DPRINT("ret=%d\n", ret);
+	if (ret)
+		goto failure;
+
+	if (ipsr->ri == 2)
+		/*
+		 * given today's architecture this case is not likely to happen because a
+		 * memory access instruction (M) can never be in the last slot of a
+		 * bundle. But let's keep it for now.
+		 */
+		regs->cr_iip += 16;
+	ipsr->ri = (ipsr->ri + 1) & 0x3;
+
+	DPRINT("ipsr->ri=%d iip=%lx\n", ipsr->ri, regs->cr_iip);
+  done:
+	return;
+
+  failure:
+	/* something went wrong... */
+	if (!user_mode(regs)) {
+		if (eh) {
+			ia64_handle_exception(regs, eh);
+			goto done;
+		}
+		if (die_if_kernel("error during unaligned kernel access\n", regs, ret))
+			return;
+		/* NOT_REACHED */
+	}
+  force_sigbus:
+	force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) ifa,
+			0, 0, 0);
+	goto done;
+}
diff --git a/arch/ia64/kernel/uncached.c b/arch/ia64/kernel/uncached.c
new file mode 100644
index 000000000..a0fec82c5
--- /dev/null
+++ b/arch/ia64/kernel/uncached.c
@@ -0,0 +1,273 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2001-2008 Silicon Graphics, Inc.  All rights reserved.
+ *
+ * A simple uncached page allocator using the generic allocator. This
+ * allocator first utilizes the spare (spill) pages found in the EFI
+ * memmap and will then start converting cached pages to uncached ones
+ * at a granule at a time. Node awareness is implemented by having a
+ * pool of pages per node.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/efi.h>
+#include <linux/nmi.h>
+#include <linux/genalloc.h>
+#include <linux/gfp.h>
+#include <linux/pgtable.h>
+#include <asm/efi.h>
+#include <asm/page.h>
+#include <asm/pal.h>
+#include <linux/atomic.h>
+#include <asm/tlbflush.h>
+
+struct uncached_pool {
+	struct gen_pool *pool;
+	struct mutex add_chunk_mutex;	/* serialize adding a converted chunk */
+	int nchunks_added;		/* #of converted chunks added to pool */
+	atomic_t status;		/* smp called function's return status*/
+};
+
+#define MAX_CONVERTED_CHUNKS_PER_NODE	2
+
+struct uncached_pool uncached_pools[MAX_NUMNODES];
+
+
+static void uncached_ipi_visibility(void *data)
+{
+	int status;
+	struct uncached_pool *uc_pool = (struct uncached_pool *)data;
+
+	status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL);
+	if ((status != PAL_VISIBILITY_OK) &&
+	    (status != PAL_VISIBILITY_OK_REMOTE_NEEDED))
+		atomic_inc(&uc_pool->status);
+}
+
+
+static void uncached_ipi_mc_drain(void *data)
+{
+	int status;
+	struct uncached_pool *uc_pool = (struct uncached_pool *)data;
+
+	status = ia64_pal_mc_drain();
+	if (status != PAL_STATUS_SUCCESS)
+		atomic_inc(&uc_pool->status);
+}
+
+
+/*
+ * Add a new chunk of uncached memory pages to the specified pool.
+ *
+ * @pool: pool to add new chunk of uncached memory to
+ * @nid: node id of node to allocate memory from, or -1
+ *
+ * This is accomplished by first allocating a granule of cached memory pages
+ * and then converting them to uncached memory pages.
+ */
+static int uncached_add_chunk(struct uncached_pool *uc_pool, int nid)
+{
+	struct page *page;
+	int status, i, nchunks_added = uc_pool->nchunks_added;
+	unsigned long c_addr, uc_addr;
+
+	if (mutex_lock_interruptible(&uc_pool->add_chunk_mutex) != 0)
+		return -1;	/* interrupted by a signal */
+
+	if (uc_pool->nchunks_added > nchunks_added) {
+		/* someone added a new chunk while we were waiting */
+		mutex_unlock(&uc_pool->add_chunk_mutex);
+		return 0;
+	}
+
+	if (uc_pool->nchunks_added >= MAX_CONVERTED_CHUNKS_PER_NODE) {
+		mutex_unlock(&uc_pool->add_chunk_mutex);
+		return -1;
+	}
+
+	/* attempt to allocate a granule's worth of cached memory pages */
+
+	page = __alloc_pages_node(nid,
+				GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
+				IA64_GRANULE_SHIFT-PAGE_SHIFT);
+	if (!page) {
+		mutex_unlock(&uc_pool->add_chunk_mutex);
+		return -1;
+	}
+
+	/* convert the memory pages from cached to uncached */
+
+	c_addr = (unsigned long)page_address(page);
+	uc_addr = c_addr - PAGE_OFFSET + __IA64_UNCACHED_OFFSET;
+
+	/*
+	 * There's a small race here where it's possible for someone to
+	 * access the page through /dev/mem halfway through the conversion
+	 * to uncached - not sure it's really worth bothering about
+	 */
+	for (i = 0; i < (IA64_GRANULE_SIZE / PAGE_SIZE); i++)
+		SetPageUncached(&page[i]);
+
+	flush_tlb_kernel_range(uc_addr, uc_addr + IA64_GRANULE_SIZE);
+
+	status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL);
+	if (status == PAL_VISIBILITY_OK_REMOTE_NEEDED) {
+		atomic_set(&uc_pool->status, 0);
+		smp_call_function(uncached_ipi_visibility, uc_pool, 1);
+		if (atomic_read(&uc_pool->status))
+			goto failed;
+	} else if (status != PAL_VISIBILITY_OK)
+		goto failed;
+
+	preempt_disable();
+
+	flush_icache_range(uc_addr, uc_addr + IA64_GRANULE_SIZE);
+
+	/* flush the just introduced uncached translation from the TLB */
+	local_flush_tlb_all();
+
+	preempt_enable();
+
+	status = ia64_pal_mc_drain();
+	if (status != PAL_STATUS_SUCCESS)
+		goto failed;
+	atomic_set(&uc_pool->status, 0);
+	smp_call_function(uncached_ipi_mc_drain, uc_pool, 1);
+	if (atomic_read(&uc_pool->status))
+		goto failed;
+
+	/*
+	 * The chunk of memory pages has been converted to uncached so now we
+	 * can add it to the pool.
+	 */
+	status = gen_pool_add(uc_pool->pool, uc_addr, IA64_GRANULE_SIZE, nid);
+	if (status)
+		goto failed;
+
+	uc_pool->nchunks_added++;
+	mutex_unlock(&uc_pool->add_chunk_mutex);
+	return 0;
+
+	/* failed to convert or add the chunk so give it back to the kernel */
+failed:
+	for (i = 0; i < (IA64_GRANULE_SIZE / PAGE_SIZE); i++)
+		ClearPageUncached(&page[i]);
+
+	free_pages(c_addr, IA64_GRANULE_SHIFT-PAGE_SHIFT);
+	mutex_unlock(&uc_pool->add_chunk_mutex);
+	return -1;
+}
+
+
+/*
+ * uncached_alloc_page
+ *
+ * @starting_nid: node id of node to start with, or -1
+ * @n_pages: number of contiguous pages to allocate
+ *
+ * Allocate the specified number of contiguous uncached pages on the
+ * requested node. If not enough contiguous uncached pages are available
+ * on the requested node, roundrobin starting with the next higher node.
+ */
+unsigned long uncached_alloc_page(int starting_nid, int n_pages)
+{
+	unsigned long uc_addr;
+	struct uncached_pool *uc_pool;
+	int nid;
+
+	if (unlikely(starting_nid >= MAX_NUMNODES))
+		return 0;
+
+	if (starting_nid < 0)
+		starting_nid = numa_node_id();
+	nid = starting_nid;
+
+	do {
+		if (!node_state(nid, N_HIGH_MEMORY))
+			continue;
+		uc_pool = &uncached_pools[nid];
+		if (uc_pool->pool == NULL)
+			continue;
+		do {
+			uc_addr = gen_pool_alloc(uc_pool->pool,
+						 n_pages * PAGE_SIZE);
+			if (uc_addr != 0)
+				return uc_addr;
+		} while (uncached_add_chunk(uc_pool, nid) == 0);
+
+	} while ((nid = (nid + 1) % MAX_NUMNODES) != starting_nid);
+
+	return 0;
+}
+EXPORT_SYMBOL(uncached_alloc_page);
+
+
+/*
+ * uncached_free_page
+ *
+ * @uc_addr: uncached address of first page to free
+ * @n_pages: number of contiguous pages to free
+ *
+ * Free the specified number of uncached pages.
+ */
+void uncached_free_page(unsigned long uc_addr, int n_pages)
+{
+	int nid = paddr_to_nid(uc_addr - __IA64_UNCACHED_OFFSET);
+	struct gen_pool *pool = uncached_pools[nid].pool;
+
+	if (unlikely(pool == NULL))
+		return;
+
+	if ((uc_addr & (0XFUL << 60)) != __IA64_UNCACHED_OFFSET)
+		panic("uncached_free_page invalid address %lx\n", uc_addr);
+
+	gen_pool_free(pool, uc_addr, n_pages * PAGE_SIZE);
+}
+EXPORT_SYMBOL(uncached_free_page);
+
+
+/*
+ * uncached_build_memmap,
+ *
+ * @uc_start: uncached starting address of a chunk of uncached memory
+ * @uc_end: uncached ending address of a chunk of uncached memory
+ * @arg: ignored, (NULL argument passed in on call to efi_memmap_walk_uc())
+ *
+ * Called at boot time to build a map of pages that can be used for
+ * memory special operations.
+ */
+static int __init uncached_build_memmap(u64 uc_start, u64 uc_end, void *arg)
+{
+	int nid = paddr_to_nid(uc_start - __IA64_UNCACHED_OFFSET);
+	struct gen_pool *pool = uncached_pools[nid].pool;
+	size_t size = uc_end - uc_start;
+
+	touch_softlockup_watchdog();
+
+	if (pool != NULL) {
+		memset((char *)uc_start, 0, size);
+		(void) gen_pool_add(pool, uc_start, size, nid);
+	}
+	return 0;
+}
+
+
+static int __init uncached_init(void)
+{
+	int nid;
+
+	for_each_online_node(nid) {
+		uncached_pools[nid].pool = gen_pool_create(PAGE_SHIFT, nid);
+		mutex_init(&uncached_pools[nid].add_chunk_mutex);
+	}
+
+	efi_memmap_walk_uc(uncached_build_memmap, NULL);
+	return 0;
+}
+
+__initcall(uncached_init);
diff --git a/arch/ia64/kernel/unwind.c b/arch/ia64/kernel/unwind.c
new file mode 100644
index 000000000..6bd64c35e
--- /dev/null
+++ b/arch/ia64/kernel/unwind.c
@@ -0,0 +1,2320 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 1999-2004 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2003 Fenghua Yu <fenghua.yu@intel.com>
+ * 	- Change pt_regs_off() to make it less dependent on pt_regs structure.
+ */
+/*
+ * This file implements call frame unwind support for the Linux
+ * kernel.  Parsing and processing the unwind information is
+ * time-consuming, so this implementation translates the unwind
+ * descriptors into unwind scripts.  These scripts are very simple
+ * (basically a sequence of assignments) and efficient to execute.
+ * They are cached for later re-use.  Each script is specific for a
+ * given instruction pointer address and the set of predicate values
+ * that the script depends on (most unwind descriptors are
+ * unconditional and scripts often do not depend on predicates at
+ * all).  This code is based on the unwind conventions described in
+ * the "IA-64 Software Conventions and Runtime Architecture" manual.
+ *
+ * SMP conventions:
+ *	o updates to the global unwind data (in structure "unw") are serialized
+ *	  by the unw.lock spinlock
+ *	o each unwind script has its own read-write lock; a thread must acquire
+ *	  a read lock before executing a script and must acquire a write lock
+ *	  before modifying a script
+ *	o if both the unw.lock spinlock and a script's read-write lock must be
+ *	  acquired, then the read-write lock must be acquired first.
+ */
+#include <linux/module.h>
+#include <linux/memblock.h>
+#include <linux/elf.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include <asm/unwind.h>
+
+#include <asm/delay.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/ptrace_offsets.h>
+#include <asm/rse.h>
+#include <asm/sections.h>
+#include <linux/uaccess.h>
+
+#include "entry.h"
+#include "unwind_i.h"
+
+#define UNW_LOG_CACHE_SIZE	7	/* each unw_script is ~256 bytes in size */
+#define UNW_CACHE_SIZE		(1 << UNW_LOG_CACHE_SIZE)
+
+#define UNW_LOG_HASH_SIZE	(UNW_LOG_CACHE_SIZE + 1)
+#define UNW_HASH_SIZE		(1 << UNW_LOG_HASH_SIZE)
+
+#define UNW_STATS	0	/* WARNING: this disabled interrupts for long time-spans!! */
+
+#ifdef UNW_DEBUG
+  static unsigned int unw_debug_level = UNW_DEBUG;
+#  define UNW_DEBUG_ON(n)	unw_debug_level >= n
+   /* Do not code a printk level, not all debug lines end in newline */
+#  define UNW_DPRINT(n, ...)  if (UNW_DEBUG_ON(n)) printk(__VA_ARGS__)
+#  undef inline
+#  define inline
+#else /* !UNW_DEBUG */
+#  define UNW_DEBUG_ON(n)  0
+#  define UNW_DPRINT(n, ...)
+#endif /* UNW_DEBUG */
+
+#if UNW_STATS
+# define STAT(x...)	x
+#else
+# define STAT(x...)
+#endif
+
+#define alloc_reg_state()	kmalloc(sizeof(struct unw_reg_state), GFP_ATOMIC)
+#define free_reg_state(usr)	kfree(usr)
+#define alloc_labeled_state()	kmalloc(sizeof(struct unw_labeled_state), GFP_ATOMIC)
+#define free_labeled_state(usr)	kfree(usr)
+
+typedef unsigned long unw_word;
+typedef unsigned char unw_hash_index_t;
+
+static struct {
+	spinlock_t lock;			/* spinlock for unwind data */
+
+	/* list of unwind tables (one per load-module) */
+	struct unw_table *tables;
+
+	unsigned long r0;			/* constant 0 for r0 */
+
+	/* table of registers that prologues can save (and order in which they're saved): */
+	const unsigned char save_order[8];
+
+	/* maps a preserved register index (preg_index) to corresponding switch_stack offset: */
+	unsigned short sw_off[sizeof(struct unw_frame_info) / 8];
+
+	unsigned short lru_head;		/* index of lead-recently used script */
+	unsigned short lru_tail;		/* index of most-recently used script */
+
+	/* index into unw_frame_info for preserved register i */
+	unsigned short preg_index[UNW_NUM_REGS];
+
+	short pt_regs_offsets[32];
+
+	/* unwind table for the kernel: */
+	struct unw_table kernel_table;
+
+	/* unwind table describing the gate page (kernel code that is mapped into user space): */
+	size_t gate_table_size;
+	unsigned long *gate_table;
+
+	/* hash table that maps instruction pointer to script index: */
+	unsigned short hash[UNW_HASH_SIZE];
+
+	/* script cache: */
+	struct unw_script cache[UNW_CACHE_SIZE];
+
+# ifdef UNW_DEBUG
+	const char *preg_name[UNW_NUM_REGS];
+# endif
+# if UNW_STATS
+	struct {
+		struct {
+			int lookups;
+			int hinted_hits;
+			int normal_hits;
+			int collision_chain_traversals;
+		} cache;
+		struct {
+			unsigned long build_time;
+			unsigned long run_time;
+			unsigned long parse_time;
+			int builds;
+			int news;
+			int collisions;
+			int runs;
+		} script;
+		struct {
+			unsigned long init_time;
+			unsigned long unwind_time;
+			int inits;
+			int unwinds;
+		} api;
+	} stat;
+# endif
+} unw = {
+	.tables = &unw.kernel_table,
+	.lock = __SPIN_LOCK_UNLOCKED(unw.lock),
+	.save_order = {
+		UNW_REG_RP, UNW_REG_PFS, UNW_REG_PSP, UNW_REG_PR,
+		UNW_REG_UNAT, UNW_REG_LC, UNW_REG_FPSR, UNW_REG_PRI_UNAT_GR
+	},
+	.preg_index = {
+		offsetof(struct unw_frame_info, pri_unat_loc)/8,	/* PRI_UNAT_GR */
+		offsetof(struct unw_frame_info, pri_unat_loc)/8,	/* PRI_UNAT_MEM */
+		offsetof(struct unw_frame_info, bsp_loc)/8,
+		offsetof(struct unw_frame_info, bspstore_loc)/8,
+		offsetof(struct unw_frame_info, pfs_loc)/8,
+		offsetof(struct unw_frame_info, rnat_loc)/8,
+		offsetof(struct unw_frame_info, psp)/8,
+		offsetof(struct unw_frame_info, rp_loc)/8,
+		offsetof(struct unw_frame_info, r4)/8,
+		offsetof(struct unw_frame_info, r5)/8,
+		offsetof(struct unw_frame_info, r6)/8,
+		offsetof(struct unw_frame_info, r7)/8,
+		offsetof(struct unw_frame_info, unat_loc)/8,
+		offsetof(struct unw_frame_info, pr_loc)/8,
+		offsetof(struct unw_frame_info, lc_loc)/8,
+		offsetof(struct unw_frame_info, fpsr_loc)/8,
+		offsetof(struct unw_frame_info, b1_loc)/8,
+		offsetof(struct unw_frame_info, b2_loc)/8,
+		offsetof(struct unw_frame_info, b3_loc)/8,
+		offsetof(struct unw_frame_info, b4_loc)/8,
+		offsetof(struct unw_frame_info, b5_loc)/8,
+		offsetof(struct unw_frame_info, f2_loc)/8,
+		offsetof(struct unw_frame_info, f3_loc)/8,
+		offsetof(struct unw_frame_info, f4_loc)/8,
+		offsetof(struct unw_frame_info, f5_loc)/8,
+		offsetof(struct unw_frame_info, fr_loc[16 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[17 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[18 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[19 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[20 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[21 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[22 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[23 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[24 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[25 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[26 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[27 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[28 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[29 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[30 - 16])/8,
+		offsetof(struct unw_frame_info, fr_loc[31 - 16])/8,
+	},
+	.pt_regs_offsets = {
+		[0] = -1,
+		offsetof(struct pt_regs,  r1),
+		offsetof(struct pt_regs,  r2),
+		offsetof(struct pt_regs,  r3),
+		[4] = -1, [5] = -1, [6] = -1, [7] = -1,
+		offsetof(struct pt_regs,  r8),
+		offsetof(struct pt_regs,  r9),
+		offsetof(struct pt_regs, r10),
+		offsetof(struct pt_regs, r11),
+		offsetof(struct pt_regs, r12),
+		offsetof(struct pt_regs, r13),
+		offsetof(struct pt_regs, r14),
+		offsetof(struct pt_regs, r15),
+		offsetof(struct pt_regs, r16),
+		offsetof(struct pt_regs, r17),
+		offsetof(struct pt_regs, r18),
+		offsetof(struct pt_regs, r19),
+		offsetof(struct pt_regs, r20),
+		offsetof(struct pt_regs, r21),
+		offsetof(struct pt_regs, r22),
+		offsetof(struct pt_regs, r23),
+		offsetof(struct pt_regs, r24),
+		offsetof(struct pt_regs, r25),
+		offsetof(struct pt_regs, r26),
+		offsetof(struct pt_regs, r27),
+		offsetof(struct pt_regs, r28),
+		offsetof(struct pt_regs, r29),
+		offsetof(struct pt_regs, r30),
+		offsetof(struct pt_regs, r31),
+	},
+	.hash = { [0 ... UNW_HASH_SIZE - 1] = -1 },
+#ifdef UNW_DEBUG
+	.preg_name = {
+		"pri_unat_gr", "pri_unat_mem", "bsp", "bspstore", "ar.pfs", "ar.rnat", "psp", "rp",
+		"r4", "r5", "r6", "r7",
+		"ar.unat", "pr", "ar.lc", "ar.fpsr",
+		"b1", "b2", "b3", "b4", "b5",
+		"f2", "f3", "f4", "f5",
+		"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
+		"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31"
+	}
+#endif
+};
+
+static inline int
+read_only (void *addr)
+{
+	return (unsigned long) ((char *) addr - (char *) &unw.r0) < sizeof(unw.r0);
+}
+
+/*
+ * Returns offset of rREG in struct pt_regs.
+ */
+static inline unsigned long
+pt_regs_off (unsigned long reg)
+{
+	short off = -1;
+
+	if (reg < ARRAY_SIZE(unw.pt_regs_offsets))
+		off = unw.pt_regs_offsets[reg];
+
+	if (off < 0) {
+		UNW_DPRINT(0, "unwind.%s: bad scratch reg r%lu\n", __func__, reg);
+		off = 0;
+	}
+	return (unsigned long) off;
+}
+
+static inline struct pt_regs *
+get_scratch_regs (struct unw_frame_info *info)
+{
+	if (!info->pt) {
+		/* This should not happen with valid unwind info.  */
+		UNW_DPRINT(0, "unwind.%s: bad unwind info: resetting info->pt\n", __func__);
+		if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
+			info->pt = (unsigned long) ((struct pt_regs *) info->psp - 1);
+		else
+			info->pt = info->sp - 16;
+	}
+	UNW_DPRINT(3, "unwind.%s: sp 0x%lx pt 0x%lx\n", __func__, info->sp, info->pt);
+	return (struct pt_regs *) info->pt;
+}
+
+/* Unwind accessors.  */
+
+int
+unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
+{
+	unsigned long *addr, *nat_addr, nat_mask = 0, dummy_nat;
+	struct unw_ireg *ireg;
+	struct pt_regs *pt;
+
+	if ((unsigned) regnum - 1 >= 127) {
+		if (regnum == 0 && !write) {
+			*val = 0;	/* read r0 always returns 0 */
+			*nat = 0;
+			return 0;
+		}
+		UNW_DPRINT(0, "unwind.%s: trying to access non-existent r%u\n",
+			   __func__, regnum);
+		return -1;
+	}
+
+	if (regnum < 32) {
+		if (regnum >= 4 && regnum <= 7) {
+			/* access a preserved register */
+			ireg = &info->r4 + (regnum - 4);
+			addr = ireg->loc;
+			if (addr) {
+				nat_addr = addr + ireg->nat.off;
+				switch (ireg->nat.type) {
+				      case UNW_NAT_VAL:
+					/* simulate getf.sig/setf.sig */
+					if (write) {
+						if (*nat) {
+							/* write NaTVal and be done with it */
+							addr[0] = 0;
+							addr[1] = 0x1fffe;
+							return 0;
+						}
+						addr[1] = 0x1003e;
+					} else {
+						if (addr[0] == 0 && addr[1] == 0x1ffe) {
+							/* return NaT and be done with it */
+							*val = 0;
+							*nat = 1;
+							return 0;
+						}
+					}
+					fallthrough;
+				      case UNW_NAT_NONE:
+					dummy_nat = 0;
+					nat_addr = &dummy_nat;
+					break;
+
+				      case UNW_NAT_MEMSTK:
+					nat_mask = (1UL << ((long) addr & 0x1f8)/8);
+					break;
+
+				      case UNW_NAT_REGSTK:
+					nat_addr = ia64_rse_rnat_addr(addr);
+					if ((unsigned long) addr < info->regstk.limit
+					    || (unsigned long) addr >= info->regstk.top)
+					{
+						UNW_DPRINT(0, "unwind.%s: %p outside of regstk "
+							"[0x%lx-0x%lx)\n",
+							__func__, (void *) addr,
+							info->regstk.limit,
+							info->regstk.top);
+						return -1;
+					}
+					if ((unsigned long) nat_addr >= info->regstk.top)
+						nat_addr = &info->sw->ar_rnat;
+					nat_mask = (1UL << ia64_rse_slot_num(addr));
+					break;
+				}
+			} else {
+				addr = &info->sw->r4 + (regnum - 4);
+				nat_addr = &info->sw->ar_unat;
+				nat_mask = (1UL << ((long) addr & 0x1f8)/8);
+			}
+		} else {
+			/* access a scratch register */
+			pt = get_scratch_regs(info);
+			addr = (unsigned long *) ((unsigned long)pt + pt_regs_off(regnum));
+			if (info->pri_unat_loc)
+				nat_addr = info->pri_unat_loc;
+			else
+				nat_addr = &info->sw->caller_unat;
+			nat_mask = (1UL << ((long) addr & 0x1f8)/8);
+		}
+	} else {
+		/* access a stacked register */
+		addr = ia64_rse_skip_regs((unsigned long *) info->bsp, regnum - 32);
+		nat_addr = ia64_rse_rnat_addr(addr);
+		if ((unsigned long) addr < info->regstk.limit
+		    || (unsigned long) addr >= info->regstk.top)
+		{
+			UNW_DPRINT(0, "unwind.%s: ignoring attempt to access register outside "
+				   "of rbs\n",  __func__);
+			return -1;
+		}
+		if ((unsigned long) nat_addr >= info->regstk.top)
+			nat_addr = &info->sw->ar_rnat;
+		nat_mask = (1UL << ia64_rse_slot_num(addr));
+	}
+
+	if (write) {
+		if (read_only(addr)) {
+			UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
+				__func__);
+		} else {
+			*addr = *val;
+			if (*nat)
+				*nat_addr |= nat_mask;
+			else
+				*nat_addr &= ~nat_mask;
+		}
+	} else {
+		if ((*nat_addr & nat_mask) == 0) {
+			*val = *addr;
+			*nat = 0;
+		} else {
+			*val = 0;	/* if register is a NaT, *addr may contain kernel data! */
+			*nat = 1;
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL(unw_access_gr);
+
+int
+unw_access_br (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
+{
+	unsigned long *addr;
+	struct pt_regs *pt;
+
+	switch (regnum) {
+		/* scratch: */
+	      case 0: pt = get_scratch_regs(info); addr = &pt->b0; break;
+	      case 6: pt = get_scratch_regs(info); addr = &pt->b6; break;
+	      case 7: pt = get_scratch_regs(info); addr = &pt->b7; break;
+
+		/* preserved: */
+	      case 1: case 2: case 3: case 4: case 5:
+		addr = *(&info->b1_loc + (regnum - 1));
+		if (!addr)
+			addr = &info->sw->b1 + (regnum - 1);
+		break;
+
+	      default:
+		UNW_DPRINT(0, "unwind.%s: trying to access non-existent b%u\n",
+			   __func__, regnum);
+		return -1;
+	}
+	if (write)
+		if (read_only(addr)) {
+			UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
+				__func__);
+		} else
+			*addr = *val;
+	else
+		*val = *addr;
+	return 0;
+}
+EXPORT_SYMBOL(unw_access_br);
+
+int
+unw_access_fr (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
+{
+	struct ia64_fpreg *addr = NULL;
+	struct pt_regs *pt;
+
+	if ((unsigned) (regnum - 2) >= 126) {
+		UNW_DPRINT(0, "unwind.%s: trying to access non-existent f%u\n",
+			   __func__, regnum);
+		return -1;
+	}
+
+	if (regnum <= 5) {
+		addr = *(&info->f2_loc + (regnum - 2));
+		if (!addr)
+			addr = &info->sw->f2 + (regnum - 2);
+	} else if (regnum <= 15) {
+		if (regnum <= 11) {
+			pt = get_scratch_regs(info);
+			addr = &pt->f6  + (regnum - 6);
+		}
+		else
+			addr = &info->sw->f12 + (regnum - 12);
+	} else if (regnum <= 31) {
+		addr = info->fr_loc[regnum - 16];
+		if (!addr)
+			addr = &info->sw->f16 + (regnum - 16);
+	} else {
+		struct task_struct *t = info->task;
+
+		if (write)
+			ia64_sync_fph(t);
+		else
+			ia64_flush_fph(t);
+		addr = t->thread.fph + (regnum - 32);
+	}
+
+	if (write)
+		if (read_only(addr)) {
+			UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
+				__func__);
+		} else
+			*addr = *val;
+	else
+		*val = *addr;
+	return 0;
+}
+EXPORT_SYMBOL(unw_access_fr);
+
+int
+unw_access_ar (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
+{
+	unsigned long *addr;
+	struct pt_regs *pt;
+
+	switch (regnum) {
+	      case UNW_AR_BSP:
+		addr = info->bsp_loc;
+		if (!addr)
+			addr = &info->sw->ar_bspstore;
+		break;
+
+	      case UNW_AR_BSPSTORE:
+		addr = info->bspstore_loc;
+		if (!addr)
+			addr = &info->sw->ar_bspstore;
+		break;
+
+	      case UNW_AR_PFS:
+		addr = info->pfs_loc;
+		if (!addr)
+			addr = &info->sw->ar_pfs;
+		break;
+
+	      case UNW_AR_RNAT:
+		addr = info->rnat_loc;
+		if (!addr)
+			addr = &info->sw->ar_rnat;
+		break;
+
+	      case UNW_AR_UNAT:
+		addr = info->unat_loc;
+		if (!addr)
+			addr = &info->sw->caller_unat;
+		break;
+
+	      case UNW_AR_LC:
+		addr = info->lc_loc;
+		if (!addr)
+			addr = &info->sw->ar_lc;
+		break;
+
+	      case UNW_AR_EC:
+		if (!info->cfm_loc)
+			return -1;
+		if (write)
+			*info->cfm_loc =
+				(*info->cfm_loc & ~(0x3fUL << 52)) | ((*val & 0x3f) << 52);
+		else
+			*val = (*info->cfm_loc >> 52) & 0x3f;
+		return 0;
+
+	      case UNW_AR_FPSR:
+		addr = info->fpsr_loc;
+		if (!addr)
+			addr = &info->sw->ar_fpsr;
+		break;
+
+	      case UNW_AR_RSC:
+		pt = get_scratch_regs(info);
+		addr = &pt->ar_rsc;
+		break;
+
+	      case UNW_AR_CCV:
+		pt = get_scratch_regs(info);
+		addr = &pt->ar_ccv;
+		break;
+
+	      case UNW_AR_CSD:
+		pt = get_scratch_regs(info);
+		addr = &pt->ar_csd;
+		break;
+
+	      case UNW_AR_SSD:
+		pt = get_scratch_regs(info);
+		addr = &pt->ar_ssd;
+		break;
+
+	      default:
+		UNW_DPRINT(0, "unwind.%s: trying to access non-existent ar%u\n",
+			   __func__, regnum);
+		return -1;
+	}
+
+	if (write) {
+		if (read_only(addr)) {
+			UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
+				__func__);
+		} else
+			*addr = *val;
+	} else
+		*val = *addr;
+	return 0;
+}
+EXPORT_SYMBOL(unw_access_ar);
+
+int
+unw_access_pr (struct unw_frame_info *info, unsigned long *val, int write)
+{
+	unsigned long *addr;
+
+	addr = info->pr_loc;
+	if (!addr)
+		addr = &info->sw->pr;
+
+	if (write) {
+		if (read_only(addr)) {
+			UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
+				__func__);
+		} else
+			*addr = *val;
+	} else
+		*val = *addr;
+	return 0;
+}
+EXPORT_SYMBOL(unw_access_pr);
+
+
+/* Routines to manipulate the state stack.  */
+
+static inline void
+push (struct unw_state_record *sr)
+{
+	struct unw_reg_state *rs;
+
+	rs = alloc_reg_state();
+	if (!rs) {
+		printk(KERN_ERR "unwind: cannot stack reg state!\n");
+		return;
+	}
+	memcpy(rs, &sr->curr, sizeof(*rs));
+	sr->curr.next = rs;
+}
+
+static void
+pop (struct unw_state_record *sr)
+{
+	struct unw_reg_state *rs = sr->curr.next;
+
+	if (!rs) {
+		printk(KERN_ERR "unwind: stack underflow!\n");
+		return;
+	}
+	memcpy(&sr->curr, rs, sizeof(*rs));
+	free_reg_state(rs);
+}
+
+/* Make a copy of the state stack.  Non-recursive to avoid stack overflows.  */
+static struct unw_reg_state *
+dup_state_stack (struct unw_reg_state *rs)
+{
+	struct unw_reg_state *copy, *prev = NULL, *first = NULL;
+
+	while (rs) {
+		copy = alloc_reg_state();
+		if (!copy) {
+			printk(KERN_ERR "unwind.dup_state_stack: out of memory\n");
+			return NULL;
+		}
+		memcpy(copy, rs, sizeof(*copy));
+		if (first)
+			prev->next = copy;
+		else
+			first = copy;
+		rs = rs->next;
+		prev = copy;
+	}
+	return first;
+}
+
+/* Free all stacked register states (but not RS itself).  */
+static void
+free_state_stack (struct unw_reg_state *rs)
+{
+	struct unw_reg_state *p, *next;
+
+	for (p = rs->next; p != NULL; p = next) {
+		next = p->next;
+		free_reg_state(p);
+	}
+	rs->next = NULL;
+}
+
+/* Unwind decoder routines */
+
+static enum unw_register_index __attribute_const__
+decode_abreg (unsigned char abreg, int memory)
+{
+	switch (abreg) {
+	      case 0x04 ... 0x07: return UNW_REG_R4 + (abreg - 0x04);
+	      case 0x22 ... 0x25: return UNW_REG_F2 + (abreg - 0x22);
+	      case 0x30 ... 0x3f: return UNW_REG_F16 + (abreg - 0x30);
+	      case 0x41 ... 0x45: return UNW_REG_B1 + (abreg - 0x41);
+	      case 0x60: return UNW_REG_PR;
+	      case 0x61: return UNW_REG_PSP;
+	      case 0x62: return memory ? UNW_REG_PRI_UNAT_MEM : UNW_REG_PRI_UNAT_GR;
+	      case 0x63: return UNW_REG_RP;
+	      case 0x64: return UNW_REG_BSP;
+	      case 0x65: return UNW_REG_BSPSTORE;
+	      case 0x66: return UNW_REG_RNAT;
+	      case 0x67: return UNW_REG_UNAT;
+	      case 0x68: return UNW_REG_FPSR;
+	      case 0x69: return UNW_REG_PFS;
+	      case 0x6a: return UNW_REG_LC;
+	      default:
+		break;
+	}
+	UNW_DPRINT(0, "unwind.%s: bad abreg=0x%x\n", __func__, abreg);
+	return UNW_REG_LC;
+}
+
+static void
+set_reg (struct unw_reg_info *reg, enum unw_where where, int when, unsigned long val)
+{
+	reg->val = val;
+	reg->where = where;
+	if (reg->when == UNW_WHEN_NEVER)
+		reg->when = when;
+}
+
+static void
+alloc_spill_area (unsigned long *offp, unsigned long regsize,
+		  struct unw_reg_info *lo, struct unw_reg_info *hi)
+{
+	struct unw_reg_info *reg;
+
+	for (reg = hi; reg >= lo; --reg) {
+		if (reg->where == UNW_WHERE_SPILL_HOME) {
+			reg->where = UNW_WHERE_PSPREL;
+			*offp -= regsize;
+			reg->val = *offp;
+		}
+	}
+}
+
+static inline void
+spill_next_when (struct unw_reg_info **regp, struct unw_reg_info *lim, unw_word t)
+{
+	struct unw_reg_info *reg;
+
+	for (reg = *regp; reg <= lim; ++reg) {
+		if (reg->where == UNW_WHERE_SPILL_HOME) {
+			reg->when = t;
+			*regp = reg + 1;
+			return;
+		}
+	}
+	UNW_DPRINT(0, "unwind.%s: excess spill!\n",  __func__);
+}
+
+static inline void
+finish_prologue (struct unw_state_record *sr)
+{
+	struct unw_reg_info *reg;
+	unsigned long off;
+	int i;
+
+	/*
+	 * First, resolve implicit register save locations (see Section "11.4.2.3 Rules
+	 * for Using Unwind Descriptors", rule 3):
+	 */
+	for (i = 0; i < (int) ARRAY_SIZE(unw.save_order); ++i) {
+		reg = sr->curr.reg + unw.save_order[i];
+		if (reg->where == UNW_WHERE_GR_SAVE) {
+			reg->where = UNW_WHERE_GR;
+			reg->val = sr->gr_save_loc++;
+		}
+	}
+
+	/*
+	 * Next, compute when the fp, general, and branch registers get
+	 * saved.  This must come before alloc_spill_area() because
+	 * we need to know which registers are spilled to their home
+	 * locations.
+	 */
+	if (sr->imask) {
+		unsigned char kind, mask = 0, *cp = sr->imask;
+		int t;
+		static const unsigned char limit[3] = {
+			UNW_REG_F31, UNW_REG_R7, UNW_REG_B5
+		};
+		struct unw_reg_info *(regs[3]);
+
+		regs[0] = sr->curr.reg + UNW_REG_F2;
+		regs[1] = sr->curr.reg + UNW_REG_R4;
+		regs[2] = sr->curr.reg + UNW_REG_B1;
+
+		for (t = 0; t < sr->region_len; ++t) {
+			if ((t & 3) == 0)
+				mask = *cp++;
+			kind = (mask >> 2*(3-(t & 3))) & 3;
+			if (kind > 0)
+				spill_next_when(&regs[kind - 1], sr->curr.reg + limit[kind - 1],
+						sr->region_start + t);
+		}
+	}
+	/*
+	 * Next, lay out the memory stack spill area:
+	 */
+	if (sr->any_spills) {
+		off = sr->spill_offset;
+		alloc_spill_area(&off, 16, sr->curr.reg + UNW_REG_F2, sr->curr.reg + UNW_REG_F31);
+		alloc_spill_area(&off,  8, sr->curr.reg + UNW_REG_B1, sr->curr.reg + UNW_REG_B5);
+		alloc_spill_area(&off,  8, sr->curr.reg + UNW_REG_R4, sr->curr.reg + UNW_REG_R7);
+	}
+}
+
+/*
+ * Region header descriptors.
+ */
+
+static void
+desc_prologue (int body, unw_word rlen, unsigned char mask, unsigned char grsave,
+	       struct unw_state_record *sr)
+{
+	int i, region_start;
+
+	if (!(sr->in_body || sr->first_region))
+		finish_prologue(sr);
+	sr->first_region = 0;
+
+	/* check if we're done: */
+	if (sr->when_target < sr->region_start + sr->region_len) {
+		sr->done = 1;
+		return;
+	}
+
+	region_start = sr->region_start + sr->region_len;
+
+	for (i = 0; i < sr->epilogue_count; ++i)
+		pop(sr);
+	sr->epilogue_count = 0;
+	sr->epilogue_start = UNW_WHEN_NEVER;
+
+	sr->region_start = region_start;
+	sr->region_len = rlen;
+	sr->in_body = body;
+
+	if (!body) {
+		push(sr);
+
+		for (i = 0; i < 4; ++i) {
+			if (mask & 0x8)
+				set_reg(sr->curr.reg + unw.save_order[i], UNW_WHERE_GR,
+					sr->region_start + sr->region_len - 1, grsave++);
+			mask <<= 1;
+		}
+		sr->gr_save_loc = grsave;
+		sr->any_spills = 0;
+		sr->imask = NULL;
+		sr->spill_offset = 0x10;	/* default to psp+16 */
+	}
+}
+
+/*
+ * Prologue descriptors.
+ */
+
+static inline void
+desc_abi (unsigned char abi, unsigned char context, struct unw_state_record *sr)
+{
+	if (abi == 3 && context == 'i') {
+		sr->flags |= UNW_FLAG_INTERRUPT_FRAME;
+		UNW_DPRINT(3, "unwind.%s: interrupt frame\n",  __func__);
+	}
+	else
+		UNW_DPRINT(0, "unwind%s: ignoring unwabi(abi=0x%x,context=0x%x)\n",
+				__func__, abi, context);
+}
+
+static inline void
+desc_br_gr (unsigned char brmask, unsigned char gr, struct unw_state_record *sr)
+{
+	int i;
+
+	for (i = 0; i < 5; ++i) {
+		if (brmask & 1)
+			set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_GR,
+				sr->region_start + sr->region_len - 1, gr++);
+		brmask >>= 1;
+	}
+}
+
+static inline void
+desc_br_mem (unsigned char brmask, struct unw_state_record *sr)
+{
+	int i;
+
+	for (i = 0; i < 5; ++i) {
+		if (brmask & 1) {
+			set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_SPILL_HOME,
+				sr->region_start + sr->region_len - 1, 0);
+			sr->any_spills = 1;
+		}
+		brmask >>= 1;
+	}
+}
+
+static inline void
+desc_frgr_mem (unsigned char grmask, unw_word frmask, struct unw_state_record *sr)
+{
+	int i;
+
+	for (i = 0; i < 4; ++i) {
+		if ((grmask & 1) != 0) {
+			set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
+				sr->region_start + sr->region_len - 1, 0);
+			sr->any_spills = 1;
+		}
+		grmask >>= 1;
+	}
+	for (i = 0; i < 20; ++i) {
+		if ((frmask & 1) != 0) {
+			int base = (i < 4) ? UNW_REG_F2 : UNW_REG_F16 - 4;
+			set_reg(sr->curr.reg + base + i, UNW_WHERE_SPILL_HOME,
+				sr->region_start + sr->region_len - 1, 0);
+			sr->any_spills = 1;
+		}
+		frmask >>= 1;
+	}
+}
+
+static inline void
+desc_fr_mem (unsigned char frmask, struct unw_state_record *sr)
+{
+	int i;
+
+	for (i = 0; i < 4; ++i) {
+		if ((frmask & 1) != 0) {
+			set_reg(sr->curr.reg + UNW_REG_F2 + i, UNW_WHERE_SPILL_HOME,
+				sr->region_start + sr->region_len - 1, 0);
+			sr->any_spills = 1;
+		}
+		frmask >>= 1;
+	}
+}
+
+static inline void
+desc_gr_gr (unsigned char grmask, unsigned char gr, struct unw_state_record *sr)
+{
+	int i;
+
+	for (i = 0; i < 4; ++i) {
+		if ((grmask & 1) != 0)
+			set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_GR,
+				sr->region_start + sr->region_len - 1, gr++);
+		grmask >>= 1;
+	}
+}
+
+static inline void
+desc_gr_mem (unsigned char grmask, struct unw_state_record *sr)
+{
+	int i;
+
+	for (i = 0; i < 4; ++i) {
+		if ((grmask & 1) != 0) {
+			set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
+				sr->region_start + sr->region_len - 1, 0);
+			sr->any_spills = 1;
+		}
+		grmask >>= 1;
+	}
+}
+
+static inline void
+desc_mem_stack_f (unw_word t, unw_word size, struct unw_state_record *sr)
+{
+	set_reg(sr->curr.reg + UNW_REG_PSP, UNW_WHERE_NONE,
+		sr->region_start + min_t(int, t, sr->region_len - 1), 16*size);
+}
+
+static inline void
+desc_mem_stack_v (unw_word t, struct unw_state_record *sr)
+{
+	sr->curr.reg[UNW_REG_PSP].when = sr->region_start + min_t(int, t, sr->region_len - 1);
+}
+
+static inline void
+desc_reg_gr (unsigned char reg, unsigned char dst, struct unw_state_record *sr)
+{
+	set_reg(sr->curr.reg + reg, UNW_WHERE_GR, sr->region_start + sr->region_len - 1, dst);
+}
+
+static inline void
+desc_reg_psprel (unsigned char reg, unw_word pspoff, struct unw_state_record *sr)
+{
+	set_reg(sr->curr.reg + reg, UNW_WHERE_PSPREL, sr->region_start + sr->region_len - 1,
+		0x10 - 4*pspoff);
+}
+
+static inline void
+desc_reg_sprel (unsigned char reg, unw_word spoff, struct unw_state_record *sr)
+{
+	set_reg(sr->curr.reg + reg, UNW_WHERE_SPREL, sr->region_start + sr->region_len - 1,
+		4*spoff);
+}
+
+static inline void
+desc_rp_br (unsigned char dst, struct unw_state_record *sr)
+{
+	sr->return_link_reg = dst;
+}
+
+static inline void
+desc_reg_when (unsigned char regnum, unw_word t, struct unw_state_record *sr)
+{
+	struct unw_reg_info *reg = sr->curr.reg + regnum;
+
+	if (reg->where == UNW_WHERE_NONE)
+		reg->where = UNW_WHERE_GR_SAVE;
+	reg->when = sr->region_start + min_t(int, t, sr->region_len - 1);
+}
+
+static inline void
+desc_spill_base (unw_word pspoff, struct unw_state_record *sr)
+{
+	sr->spill_offset = 0x10 - 4*pspoff;
+}
+
+static inline unsigned char *
+desc_spill_mask (unsigned char *imaskp, struct unw_state_record *sr)
+{
+	sr->imask = imaskp;
+	return imaskp + (2*sr->region_len + 7)/8;
+}
+
+/*
+ * Body descriptors.
+ */
+static inline void
+desc_epilogue (unw_word t, unw_word ecount, struct unw_state_record *sr)
+{
+	sr->epilogue_start = sr->region_start + sr->region_len - 1 - t;
+	sr->epilogue_count = ecount + 1;
+}
+
+static inline void
+desc_copy_state (unw_word label, struct unw_state_record *sr)
+{
+	struct unw_labeled_state *ls;
+
+	for (ls = sr->labeled_states; ls; ls = ls->next) {
+		if (ls->label == label) {
+			free_state_stack(&sr->curr);
+			memcpy(&sr->curr, &ls->saved_state, sizeof(sr->curr));
+			sr->curr.next = dup_state_stack(ls->saved_state.next);
+			return;
+		}
+	}
+	printk(KERN_ERR "unwind: failed to find state labeled 0x%lx\n", label);
+}
+
+static inline void
+desc_label_state (unw_word label, struct unw_state_record *sr)
+{
+	struct unw_labeled_state *ls;
+
+	ls = alloc_labeled_state();
+	if (!ls) {
+		printk(KERN_ERR "unwind.desc_label_state(): out of memory\n");
+		return;
+	}
+	ls->label = label;
+	memcpy(&ls->saved_state, &sr->curr, sizeof(ls->saved_state));
+	ls->saved_state.next = dup_state_stack(sr->curr.next);
+
+	/* insert into list of labeled states: */
+	ls->next = sr->labeled_states;
+	sr->labeled_states = ls;
+}
+
+/*
+ * General descriptors.
+ */
+
+static inline int
+desc_is_active (unsigned char qp, unw_word t, struct unw_state_record *sr)
+{
+	if (sr->when_target <= sr->region_start + min_t(int, t, sr->region_len - 1))
+		return 0;
+	if (qp > 0) {
+		if ((sr->pr_val & (1UL << qp)) == 0)
+			return 0;
+		sr->pr_mask |= (1UL << qp);
+	}
+	return 1;
+}
+
+static inline void
+desc_restore_p (unsigned char qp, unw_word t, unsigned char abreg, struct unw_state_record *sr)
+{
+	struct unw_reg_info *r;
+
+	if (!desc_is_active(qp, t, sr))
+		return;
+
+	r = sr->curr.reg + decode_abreg(abreg, 0);
+	r->where = UNW_WHERE_NONE;
+	r->when = UNW_WHEN_NEVER;
+	r->val = 0;
+}
+
+static inline void
+desc_spill_reg_p (unsigned char qp, unw_word t, unsigned char abreg, unsigned char x,
+		     unsigned char ytreg, struct unw_state_record *sr)
+{
+	enum unw_where where = UNW_WHERE_GR;
+	struct unw_reg_info *r;
+
+	if (!desc_is_active(qp, t, sr))
+		return;
+
+	if (x)
+		where = UNW_WHERE_BR;
+	else if (ytreg & 0x80)
+		where = UNW_WHERE_FR;
+
+	r = sr->curr.reg + decode_abreg(abreg, 0);
+	r->where = where;
+	r->when = sr->region_start + min_t(int, t, sr->region_len - 1);
+	r->val = (ytreg & 0x7f);
+}
+
+static inline void
+desc_spill_psprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word pspoff,
+		     struct unw_state_record *sr)
+{
+	struct unw_reg_info *r;
+
+	if (!desc_is_active(qp, t, sr))
+		return;
+
+	r = sr->curr.reg + decode_abreg(abreg, 1);
+	r->where = UNW_WHERE_PSPREL;
+	r->when = sr->region_start + min_t(int, t, sr->region_len - 1);
+	r->val = 0x10 - 4*pspoff;
+}
+
+static inline void
+desc_spill_sprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word spoff,
+		       struct unw_state_record *sr)
+{
+	struct unw_reg_info *r;
+
+	if (!desc_is_active(qp, t, sr))
+		return;
+
+	r = sr->curr.reg + decode_abreg(abreg, 1);
+	r->where = UNW_WHERE_SPREL;
+	r->when = sr->region_start + min_t(int, t, sr->region_len - 1);
+	r->val = 4*spoff;
+}
+
+#define UNW_DEC_BAD_CODE(code)			printk(KERN_ERR "unwind: unknown code 0x%02x\n", \
+						       code);
+
+/*
+ * region headers:
+ */
+#define UNW_DEC_PROLOGUE_GR(fmt,r,m,gr,arg)	desc_prologue(0,r,m,gr,arg)
+#define UNW_DEC_PROLOGUE(fmt,b,r,arg)		desc_prologue(b,r,0,32,arg)
+/*
+ * prologue descriptors:
+ */
+#define UNW_DEC_ABI(fmt,a,c,arg)		desc_abi(a,c,arg)
+#define UNW_DEC_BR_GR(fmt,b,g,arg)		desc_br_gr(b,g,arg)
+#define UNW_DEC_BR_MEM(fmt,b,arg)		desc_br_mem(b,arg)
+#define UNW_DEC_FRGR_MEM(fmt,g,f,arg)		desc_frgr_mem(g,f,arg)
+#define UNW_DEC_FR_MEM(fmt,f,arg)		desc_fr_mem(f,arg)
+#define UNW_DEC_GR_GR(fmt,m,g,arg)		desc_gr_gr(m,g,arg)
+#define UNW_DEC_GR_MEM(fmt,m,arg)		desc_gr_mem(m,arg)
+#define UNW_DEC_MEM_STACK_F(fmt,t,s,arg)	desc_mem_stack_f(t,s,arg)
+#define UNW_DEC_MEM_STACK_V(fmt,t,arg)		desc_mem_stack_v(t,arg)
+#define UNW_DEC_REG_GR(fmt,r,d,arg)		desc_reg_gr(r,d,arg)
+#define UNW_DEC_REG_PSPREL(fmt,r,o,arg)		desc_reg_psprel(r,o,arg)
+#define UNW_DEC_REG_SPREL(fmt,r,o,arg)		desc_reg_sprel(r,o,arg)
+#define UNW_DEC_REG_WHEN(fmt,r,t,arg)		desc_reg_when(r,t,arg)
+#define UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg)	desc_reg_when(UNW_REG_PRI_UNAT_GR,t,arg)
+#define UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg)	desc_reg_when(UNW_REG_PRI_UNAT_MEM,t,arg)
+#define UNW_DEC_PRIUNAT_GR(fmt,r,arg)		desc_reg_gr(UNW_REG_PRI_UNAT_GR,r,arg)
+#define UNW_DEC_PRIUNAT_PSPREL(fmt,o,arg)	desc_reg_psprel(UNW_REG_PRI_UNAT_MEM,o,arg)
+#define UNW_DEC_PRIUNAT_SPREL(fmt,o,arg)	desc_reg_sprel(UNW_REG_PRI_UNAT_MEM,o,arg)
+#define UNW_DEC_RP_BR(fmt,d,arg)		desc_rp_br(d,arg)
+#define UNW_DEC_SPILL_BASE(fmt,o,arg)		desc_spill_base(o,arg)
+#define UNW_DEC_SPILL_MASK(fmt,m,arg)		(m = desc_spill_mask(m,arg))
+/*
+ * body descriptors:
+ */
+#define UNW_DEC_EPILOGUE(fmt,t,c,arg)		desc_epilogue(t,c,arg)
+#define UNW_DEC_COPY_STATE(fmt,l,arg)		desc_copy_state(l,arg)
+#define UNW_DEC_LABEL_STATE(fmt,l,arg)		desc_label_state(l,arg)
+/*
+ * general unwind descriptors:
+ */
+#define UNW_DEC_SPILL_REG_P(f,p,t,a,x,y,arg)	desc_spill_reg_p(p,t,a,x,y,arg)
+#define UNW_DEC_SPILL_REG(f,t,a,x,y,arg)	desc_spill_reg_p(0,t,a,x,y,arg)
+#define UNW_DEC_SPILL_PSPREL_P(f,p,t,a,o,arg)	desc_spill_psprel_p(p,t,a,o,arg)
+#define UNW_DEC_SPILL_PSPREL(f,t,a,o,arg)	desc_spill_psprel_p(0,t,a,o,arg)
+#define UNW_DEC_SPILL_SPREL_P(f,p,t,a,o,arg)	desc_spill_sprel_p(p,t,a,o,arg)
+#define UNW_DEC_SPILL_SPREL(f,t,a,o,arg)	desc_spill_sprel_p(0,t,a,o,arg)
+#define UNW_DEC_RESTORE_P(f,p,t,a,arg)		desc_restore_p(p,t,a,arg)
+#define UNW_DEC_RESTORE(f,t,a,arg)		desc_restore_p(0,t,a,arg)
+
+#include "unwind_decoder.c"
+
+
+/* Unwind scripts. */
+
+static inline unw_hash_index_t
+hash (unsigned long ip)
+{
+	/* magic number = ((sqrt(5)-1)/2)*2^64 */
+	static const unsigned long hashmagic = 0x9e3779b97f4a7c16UL;
+
+	return (ip >> 4) * hashmagic >> (64 - UNW_LOG_HASH_SIZE);
+}
+
+static inline long
+cache_match (struct unw_script *script, unsigned long ip, unsigned long pr)
+{
+	read_lock(&script->lock);
+	if (ip == script->ip && ((pr ^ script->pr_val) & script->pr_mask) == 0)
+		/* keep the read lock... */
+		return 1;
+	read_unlock(&script->lock);
+	return 0;
+}
+
+static inline struct unw_script *
+script_lookup (struct unw_frame_info *info)
+{
+	struct unw_script *script = unw.cache + info->hint;
+	unsigned short index;
+	unsigned long ip, pr;
+
+	if (UNW_DEBUG_ON(0))
+		return NULL;	/* Always regenerate scripts in debug mode */
+
+	STAT(++unw.stat.cache.lookups);
+
+	ip = info->ip;
+	pr = info->pr;
+
+	if (cache_match(script, ip, pr)) {
+		STAT(++unw.stat.cache.hinted_hits);
+		return script;
+	}
+
+	index = unw.hash[hash(ip)];
+	if (index >= UNW_CACHE_SIZE)
+		return NULL;
+
+	script = unw.cache + index;
+	while (1) {
+		if (cache_match(script, ip, pr)) {
+			/* update hint; no locking required as single-word writes are atomic */
+			STAT(++unw.stat.cache.normal_hits);
+			unw.cache[info->prev_script].hint = script - unw.cache;
+			return script;
+		}
+		if (script->coll_chain >= UNW_HASH_SIZE)
+			return NULL;
+		script = unw.cache + script->coll_chain;
+		STAT(++unw.stat.cache.collision_chain_traversals);
+	}
+}
+
+/*
+ * On returning, a write lock for the SCRIPT is still being held.
+ */
+static inline struct unw_script *
+script_new (unsigned long ip)
+{
+	struct unw_script *script, *prev, *tmp;
+	unw_hash_index_t index;
+	unsigned short head;
+
+	STAT(++unw.stat.script.news);
+
+	/*
+	 * Can't (easily) use cmpxchg() here because of ABA problem
+	 * that is intrinsic in cmpxchg()...
+	 */
+	head = unw.lru_head;
+	script = unw.cache + head;
+	unw.lru_head = script->lru_chain;
+
+	/*
+	 * We'd deadlock here if we interrupted a thread that is holding a read lock on
+	 * script->lock.  Thus, if the write_trylock() fails, we simply bail out.  The
+	 * alternative would be to disable interrupts whenever we hold a read-lock, but
+	 * that seems silly.
+	 */
+	if (!write_trylock(&script->lock))
+		return NULL;
+
+	/* re-insert script at the tail of the LRU chain: */
+	unw.cache[unw.lru_tail].lru_chain = head;
+	unw.lru_tail = head;
+
+	/* remove the old script from the hash table (if it's there): */
+	if (script->ip) {
+		index = hash(script->ip);
+		tmp = unw.cache + unw.hash[index];
+		prev = NULL;
+		while (1) {
+			if (tmp == script) {
+				if (prev)
+					prev->coll_chain = tmp->coll_chain;
+				else
+					unw.hash[index] = tmp->coll_chain;
+				break;
+			} else
+				prev = tmp;
+			if (tmp->coll_chain >= UNW_CACHE_SIZE)
+			/* old script wasn't in the hash-table */
+				break;
+			tmp = unw.cache + tmp->coll_chain;
+		}
+	}
+
+	/* enter new script in the hash table */
+	index = hash(ip);
+	script->coll_chain = unw.hash[index];
+	unw.hash[index] = script - unw.cache;
+
+	script->ip = ip;	/* set new IP while we're holding the locks */
+
+	STAT(if (script->coll_chain < UNW_CACHE_SIZE) ++unw.stat.script.collisions);
+
+	script->flags = 0;
+	script->hint = 0;
+	script->count = 0;
+	return script;
+}
+
+static void
+script_finalize (struct unw_script *script, struct unw_state_record *sr)
+{
+	script->pr_mask = sr->pr_mask;
+	script->pr_val = sr->pr_val;
+	/*
+	 * We could down-grade our write-lock on script->lock here but
+	 * the rwlock API doesn't offer atomic lock downgrading, so
+	 * we'll just keep the write-lock and release it later when
+	 * we're done using the script.
+	 */
+}
+
+static inline void
+script_emit (struct unw_script *script, struct unw_insn insn)
+{
+	if (script->count >= UNW_MAX_SCRIPT_LEN) {
+		UNW_DPRINT(0, "unwind.%s: script exceeds maximum size of %u instructions!\n",
+			__func__, UNW_MAX_SCRIPT_LEN);
+		return;
+	}
+	script->insn[script->count++] = insn;
+}
+
+static inline void
+emit_nat_info (struct unw_state_record *sr, int i, struct unw_script *script)
+{
+	struct unw_reg_info *r = sr->curr.reg + i;
+	enum unw_insn_opcode opc;
+	struct unw_insn insn;
+	unsigned long val = 0;
+
+	switch (r->where) {
+	      case UNW_WHERE_GR:
+		if (r->val >= 32) {
+			/* register got spilled to a stacked register */
+			opc = UNW_INSN_SETNAT_TYPE;
+			val = UNW_NAT_REGSTK;
+		} else
+			/* register got spilled to a scratch register */
+			opc = UNW_INSN_SETNAT_MEMSTK;
+		break;
+
+	      case UNW_WHERE_FR:
+		opc = UNW_INSN_SETNAT_TYPE;
+		val = UNW_NAT_VAL;
+		break;
+
+	      case UNW_WHERE_BR:
+		opc = UNW_INSN_SETNAT_TYPE;
+		val = UNW_NAT_NONE;
+		break;
+
+	      case UNW_WHERE_PSPREL:
+	      case UNW_WHERE_SPREL:
+		opc = UNW_INSN_SETNAT_MEMSTK;
+		break;
+
+	      default:
+		UNW_DPRINT(0, "unwind.%s: don't know how to emit nat info for where = %u\n",
+			   __func__, r->where);
+		return;
+	}
+	insn.opc = opc;
+	insn.dst = unw.preg_index[i];
+	insn.val = val;
+	script_emit(script, insn);
+}
+
+static void
+compile_reg (struct unw_state_record *sr, int i, struct unw_script *script)
+{
+	struct unw_reg_info *r = sr->curr.reg + i;
+	enum unw_insn_opcode opc;
+	unsigned long val, rval;
+	struct unw_insn insn;
+	long need_nat_info;
+
+	if (r->where == UNW_WHERE_NONE || r->when >= sr->when_target)
+		return;
+
+	opc = UNW_INSN_MOVE;
+	val = rval = r->val;
+	need_nat_info = (i >= UNW_REG_R4 && i <= UNW_REG_R7);
+
+	switch (r->where) {
+	      case UNW_WHERE_GR:
+		if (rval >= 32) {
+			opc = UNW_INSN_MOVE_STACKED;
+			val = rval - 32;
+		} else if (rval >= 4 && rval <= 7) {
+			if (need_nat_info) {
+				opc = UNW_INSN_MOVE2;
+				need_nat_info = 0;
+			}
+			val = unw.preg_index[UNW_REG_R4 + (rval - 4)];
+		} else if (rval == 0) {
+			opc = UNW_INSN_MOVE_CONST;
+			val = 0;
+		} else {
+			/* register got spilled to a scratch register */
+			opc = UNW_INSN_MOVE_SCRATCH;
+			val = pt_regs_off(rval);
+		}
+		break;
+
+	      case UNW_WHERE_FR:
+		if (rval <= 5)
+			val = unw.preg_index[UNW_REG_F2  + (rval -  2)];
+		else if (rval >= 16 && rval <= 31)
+			val = unw.preg_index[UNW_REG_F16 + (rval - 16)];
+		else {
+			opc = UNW_INSN_MOVE_SCRATCH;
+			if (rval <= 11)
+				val = offsetof(struct pt_regs, f6) + 16*(rval - 6);
+			else
+				UNW_DPRINT(0, "unwind.%s: kernel may not touch f%lu\n",
+					   __func__, rval);
+		}
+		break;
+
+	      case UNW_WHERE_BR:
+		if (rval >= 1 && rval <= 5)
+			val = unw.preg_index[UNW_REG_B1 + (rval - 1)];
+		else {
+			opc = UNW_INSN_MOVE_SCRATCH;
+			if (rval == 0)
+				val = offsetof(struct pt_regs, b0);
+			else if (rval == 6)
+				val = offsetof(struct pt_regs, b6);
+			else
+				val = offsetof(struct pt_regs, b7);
+		}
+		break;
+
+	      case UNW_WHERE_SPREL:
+		opc = UNW_INSN_ADD_SP;
+		break;
+
+	      case UNW_WHERE_PSPREL:
+		opc = UNW_INSN_ADD_PSP;
+		break;
+
+	      default:
+		UNW_DPRINT(0, "unwind%s: register %u has unexpected `where' value of %u\n",
+			   __func__, i, r->where);
+		break;
+	}
+	insn.opc = opc;
+	insn.dst = unw.preg_index[i];
+	insn.val = val;
+	script_emit(script, insn);
+	if (need_nat_info)
+		emit_nat_info(sr, i, script);
+
+	if (i == UNW_REG_PSP) {
+		/*
+		 * info->psp must contain the _value_ of the previous
+		 * sp, not it's save location.  We get this by
+		 * dereferencing the value we just stored in
+		 * info->psp:
+		 */
+		insn.opc = UNW_INSN_LOAD;
+		insn.dst = insn.val = unw.preg_index[UNW_REG_PSP];
+		script_emit(script, insn);
+	}
+}
+
+static inline const struct unw_table_entry *
+lookup (struct unw_table *table, unsigned long rel_ip)
+{
+	const struct unw_table_entry *e = NULL;
+	unsigned long lo, hi, mid;
+
+	/* do a binary search for right entry: */
+	for (lo = 0, hi = table->length; lo < hi; ) {
+		mid = (lo + hi) / 2;
+		e = &table->array[mid];
+		if (rel_ip < e->start_offset)
+			hi = mid;
+		else if (rel_ip >= e->end_offset)
+			lo = mid + 1;
+		else
+			break;
+	}
+	if (rel_ip < e->start_offset || rel_ip >= e->end_offset)
+		return NULL;
+	return e;
+}
+
+/*
+ * Build an unwind script that unwinds from state OLD_STATE to the
+ * entrypoint of the function that called OLD_STATE.
+ */
+static inline struct unw_script *
+build_script (struct unw_frame_info *info)
+{
+	const struct unw_table_entry *e = NULL;
+	struct unw_script *script = NULL;
+	struct unw_labeled_state *ls, *next;
+	unsigned long ip = info->ip;
+	struct unw_state_record sr;
+	struct unw_table *table, *prev;
+	struct unw_reg_info *r;
+	struct unw_insn insn;
+	u8 *dp, *desc_end;
+	u64 hdr;
+	int i;
+	STAT(unsigned long start, parse_start;)
+
+	STAT(++unw.stat.script.builds; start = ia64_get_itc());
+
+	/* build state record */
+	memset(&sr, 0, sizeof(sr));
+	for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r)
+		r->when = UNW_WHEN_NEVER;
+	sr.pr_val = info->pr;
+
+	UNW_DPRINT(3, "unwind.%s: ip 0x%lx\n", __func__, ip);
+	script = script_new(ip);
+	if (!script) {
+		UNW_DPRINT(0, "unwind.%s: failed to create unwind script\n",  __func__);
+		STAT(unw.stat.script.build_time += ia64_get_itc() - start);
+		return NULL;
+	}
+	unw.cache[info->prev_script].hint = script - unw.cache;
+
+	/* search the kernels and the modules' unwind tables for IP: */
+
+	STAT(parse_start = ia64_get_itc());
+
+	prev = NULL;
+	for (table = unw.tables; table; table = table->next) {
+		if (ip >= table->start && ip < table->end) {
+			/*
+			 * Leave the kernel unwind table at the very front,
+			 * lest moving it breaks some assumption elsewhere.
+			 * Otherwise, move the matching table to the second
+			 * position in the list so that traversals can benefit
+			 * from commonality in backtrace paths.
+			 */
+			if (prev && prev != unw.tables) {
+				/* unw is safe - we're already spinlocked */
+				prev->next = table->next;
+				table->next = unw.tables->next;
+				unw.tables->next = table;
+			}
+			e = lookup(table, ip - table->segment_base);
+			break;
+		}
+		prev = table;
+	}
+	if (!e) {
+		/* no info, return default unwinder (leaf proc, no mem stack, no saved regs)  */
+		UNW_DPRINT(1, "unwind.%s: no unwind info for ip=0x%lx (prev ip=0x%lx)\n",
+			__func__, ip, unw.cache[info->prev_script].ip);
+		sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
+		sr.curr.reg[UNW_REG_RP].when = -1;
+		sr.curr.reg[UNW_REG_RP].val = 0;
+		compile_reg(&sr, UNW_REG_RP, script);
+		script_finalize(script, &sr);
+		STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start);
+		STAT(unw.stat.script.build_time += ia64_get_itc() - start);
+		return script;
+	}
+
+	sr.when_target = (3*((ip & ~0xfUL) - (table->segment_base + e->start_offset))/16
+			  + (ip & 0xfUL));
+	hdr = *(u64 *) (table->segment_base + e->info_offset);
+	dp =   (u8 *)  (table->segment_base + e->info_offset + 8);
+	desc_end = dp + 8*UNW_LENGTH(hdr);
+
+	while (!sr.done && dp < desc_end)
+		dp = unw_decode(dp, sr.in_body, &sr);
+
+	if (sr.when_target > sr.epilogue_start) {
+		/*
+		 * sp has been restored and all values on the memory stack below
+		 * psp also have been restored.
+		 */
+		sr.curr.reg[UNW_REG_PSP].val = 0;
+		sr.curr.reg[UNW_REG_PSP].where = UNW_WHERE_NONE;
+		sr.curr.reg[UNW_REG_PSP].when = UNW_WHEN_NEVER;
+		for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r)
+			if ((r->where == UNW_WHERE_PSPREL && r->val <= 0x10)
+			    || r->where == UNW_WHERE_SPREL)
+			{
+				r->val = 0;
+				r->where = UNW_WHERE_NONE;
+				r->when = UNW_WHEN_NEVER;
+			}
+	}
+
+	script->flags = sr.flags;
+
+	/*
+	 * If RP did't get saved, generate entry for the return link
+	 * register.
+	 */
+	if (sr.curr.reg[UNW_REG_RP].when >= sr.when_target) {
+		sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
+		sr.curr.reg[UNW_REG_RP].when = -1;
+		sr.curr.reg[UNW_REG_RP].val = sr.return_link_reg;
+		UNW_DPRINT(1, "unwind.%s: using default for rp at ip=0x%lx where=%d val=0x%lx\n",
+			   __func__, ip, sr.curr.reg[UNW_REG_RP].where,
+			   sr.curr.reg[UNW_REG_RP].val);
+	}
+
+#ifdef UNW_DEBUG
+	UNW_DPRINT(1, "unwind.%s: state record for func 0x%lx, t=%u:\n",
+		__func__, table->segment_base + e->start_offset, sr.when_target);
+	for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) {
+		if (r->where != UNW_WHERE_NONE || r->when != UNW_WHEN_NEVER) {
+			UNW_DPRINT(1, "  %s <- ", unw.preg_name[r - sr.curr.reg]);
+			switch (r->where) {
+			      case UNW_WHERE_GR:     UNW_DPRINT(1, "r%lu", r->val); break;
+			      case UNW_WHERE_FR:     UNW_DPRINT(1, "f%lu", r->val); break;
+			      case UNW_WHERE_BR:     UNW_DPRINT(1, "b%lu", r->val); break;
+			      case UNW_WHERE_SPREL:  UNW_DPRINT(1, "[sp+0x%lx]", r->val); break;
+			      case UNW_WHERE_PSPREL: UNW_DPRINT(1, "[psp+0x%lx]", r->val); break;
+			      case UNW_WHERE_NONE:
+				UNW_DPRINT(1, "%s+0x%lx", unw.preg_name[r - sr.curr.reg], r->val);
+				break;
+
+			      default:
+				UNW_DPRINT(1, "BADWHERE(%d)", r->where);
+				break;
+			}
+			UNW_DPRINT(1, "\t\t%d\n", r->when);
+		}
+	}
+#endif
+
+	STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start);
+
+	/* translate state record into unwinder instructions: */
+
+	/*
+	 * First, set psp if we're dealing with a fixed-size frame;
+	 * subsequent instructions may depend on this value.
+	 */
+	if (sr.when_target > sr.curr.reg[UNW_REG_PSP].when
+	    && (sr.curr.reg[UNW_REG_PSP].where == UNW_WHERE_NONE)
+	    && sr.curr.reg[UNW_REG_PSP].val != 0) {
+		/* new psp is sp plus frame size */
+		insn.opc = UNW_INSN_ADD;
+		insn.dst = offsetof(struct unw_frame_info, psp)/8;
+		insn.val = sr.curr.reg[UNW_REG_PSP].val;	/* frame size */
+		script_emit(script, insn);
+	}
+
+	/* determine where the primary UNaT is: */
+	if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_GR].when)
+		i = UNW_REG_PRI_UNAT_MEM;
+	else if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when)
+		i = UNW_REG_PRI_UNAT_GR;
+	else if (sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when > sr.curr.reg[UNW_REG_PRI_UNAT_GR].when)
+		i = UNW_REG_PRI_UNAT_MEM;
+	else
+		i = UNW_REG_PRI_UNAT_GR;
+
+	compile_reg(&sr, i, script);
+
+	for (i = UNW_REG_BSP; i < UNW_NUM_REGS; ++i)
+		compile_reg(&sr, i, script);
+
+	/* free labeled register states & stack: */
+
+	STAT(parse_start = ia64_get_itc());
+	for (ls = sr.labeled_states; ls; ls = next) {
+		next = ls->next;
+		free_state_stack(&ls->saved_state);
+		free_labeled_state(ls);
+	}
+	free_state_stack(&sr.curr);
+	STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start);
+
+	script_finalize(script, &sr);
+	STAT(unw.stat.script.build_time += ia64_get_itc() - start);
+	return script;
+}
+
+/*
+ * Apply the unwinding actions represented by OPS and update SR to
+ * reflect the state that existed upon entry to the function that this
+ * unwinder represents.
+ */
+static inline void
+run_script (struct unw_script *script, struct unw_frame_info *state)
+{
+	struct unw_insn *ip, *limit, next_insn;
+	unsigned long opc, dst, val, off;
+	unsigned long *s = (unsigned long *) state;
+	STAT(unsigned long start;)
+
+	STAT(++unw.stat.script.runs; start = ia64_get_itc());
+	state->flags = script->flags;
+	ip = script->insn;
+	limit = script->insn + script->count;
+	next_insn = *ip;
+
+	while (ip++ < limit) {
+		opc = next_insn.opc;
+		dst = next_insn.dst;
+		val = next_insn.val;
+		next_insn = *ip;
+
+	  redo:
+		switch (opc) {
+		      case UNW_INSN_ADD:
+			s[dst] += val;
+			break;
+
+		      case UNW_INSN_MOVE2:
+			if (!s[val])
+				goto lazy_init;
+			s[dst+1] = s[val+1];
+			s[dst] = s[val];
+			break;
+
+		      case UNW_INSN_MOVE:
+			if (!s[val])
+				goto lazy_init;
+			s[dst] = s[val];
+			break;
+
+		      case UNW_INSN_MOVE_SCRATCH:
+			if (state->pt) {
+				s[dst] = (unsigned long) get_scratch_regs(state) + val;
+			} else {
+				s[dst] = 0;
+				UNW_DPRINT(0, "unwind.%s: no state->pt, dst=%ld, val=%ld\n",
+					   __func__, dst, val);
+			}
+			break;
+
+		      case UNW_INSN_MOVE_CONST:
+			if (val == 0)
+				s[dst] = (unsigned long) &unw.r0;
+			else {
+				s[dst] = 0;
+				UNW_DPRINT(0, "unwind.%s: UNW_INSN_MOVE_CONST bad val=%ld\n",
+					   __func__, val);
+			}
+			break;
+
+
+		      case UNW_INSN_MOVE_STACKED:
+			s[dst] = (unsigned long) ia64_rse_skip_regs((unsigned long *)state->bsp,
+								    val);
+			break;
+
+		      case UNW_INSN_ADD_PSP:
+			s[dst] = state->psp + val;
+			break;
+
+		      case UNW_INSN_ADD_SP:
+			s[dst] = state->sp + val;
+			break;
+
+		      case UNW_INSN_SETNAT_MEMSTK:
+			if (!state->pri_unat_loc)
+				state->pri_unat_loc = &state->sw->caller_unat;
+			/* register off. is a multiple of 8, so the least 3 bits (type) are 0 */
+			s[dst+1] = ((unsigned long) state->pri_unat_loc - s[dst]) | UNW_NAT_MEMSTK;
+			break;
+
+		      case UNW_INSN_SETNAT_TYPE:
+			s[dst+1] = val;
+			break;
+
+		      case UNW_INSN_LOAD:
+#ifdef UNW_DEBUG
+			if ((s[val] & (local_cpu_data->unimpl_va_mask | 0x7)) != 0
+			    || s[val] < TASK_SIZE)
+			{
+				UNW_DPRINT(0, "unwind.%s: rejecting bad psp=0x%lx\n",
+					   __func__, s[val]);
+				break;
+			}
+#endif
+			s[dst] = *(unsigned long *) s[val];
+			break;
+		}
+	}
+	STAT(unw.stat.script.run_time += ia64_get_itc() - start);
+	return;
+
+  lazy_init:
+	off = unw.sw_off[val];
+	s[val] = (unsigned long) state->sw + off;
+	if (off >= offsetof(struct switch_stack, r4) && off <= offsetof(struct switch_stack, r7))
+		/*
+		 * We're initializing a general register: init NaT info, too.  Note that
+		 * the offset is a multiple of 8 which gives us the 3 bits needed for
+		 * the type field.
+		 */
+		s[val+1] = (offsetof(struct switch_stack, ar_unat) - off) | UNW_NAT_MEMSTK;
+	goto redo;
+}
+
+static int
+find_save_locs (struct unw_frame_info *info)
+{
+	int have_write_lock = 0;
+	struct unw_script *scr;
+	unsigned long flags = 0;
+
+	if ((info->ip & (local_cpu_data->unimpl_va_mask | 0xf)) || info->ip < TASK_SIZE) {
+		/* don't let obviously bad addresses pollute the cache */
+		/* FIXME: should really be level 0 but it occurs too often. KAO */
+		UNW_DPRINT(1, "unwind.%s: rejecting bad ip=0x%lx\n", __func__, info->ip);
+		info->rp_loc = NULL;
+		return -1;
+	}
+
+	scr = script_lookup(info);
+	if (!scr) {
+		spin_lock_irqsave(&unw.lock, flags);
+		scr = build_script(info);
+		if (!scr) {
+			spin_unlock_irqrestore(&unw.lock, flags);
+			UNW_DPRINT(0,
+				   "unwind.%s: failed to locate/build unwind script for ip %lx\n",
+				   __func__, info->ip);
+			return -1;
+		}
+		have_write_lock = 1;
+	}
+	info->hint = scr->hint;
+	info->prev_script = scr - unw.cache;
+
+	run_script(scr, info);
+
+	if (have_write_lock) {
+		write_unlock(&scr->lock);
+		spin_unlock_irqrestore(&unw.lock, flags);
+	} else
+		read_unlock(&scr->lock);
+	return 0;
+}
+
+static int
+unw_valid(const struct unw_frame_info *info, unsigned long* p)
+{
+	unsigned long loc = (unsigned long)p;
+	return (loc >= info->regstk.limit && loc < info->regstk.top) ||
+	       (loc >= info->memstk.top && loc < info->memstk.limit);
+}
+
+int
+unw_unwind (struct unw_frame_info *info)
+{
+	unsigned long prev_ip, prev_sp, prev_bsp;
+	unsigned long ip, pr, num_regs;
+	STAT(unsigned long start, flags;)
+	int retval;
+
+	STAT(local_irq_save(flags); ++unw.stat.api.unwinds; start = ia64_get_itc());
+
+	prev_ip = info->ip;
+	prev_sp = info->sp;
+	prev_bsp = info->bsp;
+
+	/* validate the return IP pointer */
+	if (!unw_valid(info, info->rp_loc)) {
+		/* FIXME: should really be level 0 but it occurs too often. KAO */
+		UNW_DPRINT(1, "unwind.%s: failed to locate return link (ip=0x%lx)!\n",
+			   __func__, info->ip);
+		STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
+		return -1;
+	}
+	/* restore the ip */
+	ip = info->ip = *info->rp_loc;
+	if (ip < GATE_ADDR) {
+		UNW_DPRINT(2, "unwind.%s: reached user-space (ip=0x%lx)\n", __func__, ip);
+		STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
+		return -1;
+	}
+
+	/* validate the previous stack frame pointer */
+	if (!unw_valid(info, info->pfs_loc)) {
+		UNW_DPRINT(0, "unwind.%s: failed to locate ar.pfs!\n", __func__);
+		STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
+		return -1;
+	}
+	/* restore the cfm: */
+	info->cfm_loc = info->pfs_loc;
+
+	/* restore the bsp: */
+	pr = info->pr;
+	num_regs = 0;
+	if ((info->flags & UNW_FLAG_INTERRUPT_FRAME)) {
+		info->pt = info->sp + 16;
+		if ((pr & (1UL << PRED_NON_SYSCALL)) != 0)
+			num_regs = *info->cfm_loc & 0x7f;		/* size of frame */
+		info->pfs_loc =
+			(unsigned long *) (info->pt + offsetof(struct pt_regs, ar_pfs));
+		UNW_DPRINT(3, "unwind.%s: interrupt_frame pt 0x%lx\n", __func__, info->pt);
+	} else
+		num_regs = (*info->cfm_loc >> 7) & 0x7f;	/* size of locals */
+	info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->bsp, -num_regs);
+	if (info->bsp < info->regstk.limit || info->bsp > info->regstk.top) {
+		UNW_DPRINT(0, "unwind.%s: bsp (0x%lx) out of range [0x%lx-0x%lx]\n",
+			__func__, info->bsp, info->regstk.limit, info->regstk.top);
+		STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
+		return -1;
+	}
+
+	/* restore the sp: */
+	info->sp = info->psp;
+	if (info->sp < info->memstk.top || info->sp > info->memstk.limit) {
+		UNW_DPRINT(0, "unwind.%s: sp (0x%lx) out of range [0x%lx-0x%lx]\n",
+			__func__, info->sp, info->memstk.top, info->memstk.limit);
+		STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
+		return -1;
+	}
+
+	if (info->ip == prev_ip && info->sp == prev_sp && info->bsp == prev_bsp) {
+		UNW_DPRINT(0, "unwind.%s: ip, sp, bsp unchanged; stopping here (ip=0x%lx)\n",
+			   __func__, ip);
+		STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
+		return -1;
+	}
+
+	/* as we unwind, the saved ar.unat becomes the primary unat: */
+	info->pri_unat_loc = info->unat_loc;
+
+	/* finally, restore the predicates: */
+	unw_get_pr(info, &info->pr);
+
+	retval = find_save_locs(info);
+	STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
+	return retval;
+}
+EXPORT_SYMBOL(unw_unwind);
+
+int
+unw_unwind_to_user (struct unw_frame_info *info)
+{
+	unsigned long ip, sp, pr = info->pr;
+
+	do {
+		unw_get_sp(info, &sp);
+		if ((long)((unsigned long)info->task + IA64_STK_OFFSET - sp)
+		    < IA64_PT_REGS_SIZE) {
+			UNW_DPRINT(0, "unwind.%s: ran off the top of the kernel stack\n",
+				   __func__);
+			break;
+		}
+		if (unw_is_intr_frame(info) &&
+		    (pr & (1UL << PRED_USER_STACK)))
+			return 0;
+		if (unw_get_pr (info, &pr) < 0) {
+			unw_get_rp(info, &ip);
+			UNW_DPRINT(0, "unwind.%s: failed to read "
+				   "predicate register (ip=0x%lx)\n",
+				__func__, ip);
+			return -1;
+		}
+	} while (unw_unwind(info) >= 0);
+	unw_get_ip(info, &ip);
+	UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n",
+		   __func__, ip);
+	return -1;
+}
+EXPORT_SYMBOL(unw_unwind_to_user);
+
+static void
+init_frame_info (struct unw_frame_info *info, struct task_struct *t,
+		 struct switch_stack *sw, unsigned long stktop)
+{
+	unsigned long rbslimit, rbstop, stklimit;
+	STAT(unsigned long start, flags;)
+
+	STAT(local_irq_save(flags); ++unw.stat.api.inits; start = ia64_get_itc());
+
+	/*
+	 * Subtle stuff here: we _could_ unwind through the switch_stack frame but we
+	 * don't want to do that because it would be slow as each preserved register would
+	 * have to be processed.  Instead, what we do here is zero out the frame info and
+	 * start the unwind process at the function that created the switch_stack frame.
+	 * When a preserved value in switch_stack needs to be accessed, run_script() will
+	 * initialize the appropriate pointer on demand.
+	 */
+	memset(info, 0, sizeof(*info));
+
+	rbslimit = (unsigned long) t + IA64_RBS_OFFSET;
+	stklimit = (unsigned long) t + IA64_STK_OFFSET;
+
+	rbstop   = sw->ar_bspstore;
+	if (rbstop > stklimit || rbstop < rbslimit)
+		rbstop = rbslimit;
+
+	if (stktop <= rbstop)
+		stktop = rbstop;
+	if (stktop > stklimit)
+		stktop = stklimit;
+
+	info->regstk.limit = rbslimit;
+	info->regstk.top   = rbstop;
+	info->memstk.limit = stklimit;
+	info->memstk.top   = stktop;
+	info->task = t;
+	info->sw  = sw;
+	info->sp = info->psp = stktop;
+	info->pr = sw->pr;
+	UNW_DPRINT(3, "unwind.%s:\n"
+		   "  task   0x%lx\n"
+		   "  rbs = [0x%lx-0x%lx)\n"
+		   "  stk = [0x%lx-0x%lx)\n"
+		   "  pr     0x%lx\n"
+		   "  sw     0x%lx\n"
+		   "  sp     0x%lx\n",
+		   __func__, (unsigned long) t, rbslimit, rbstop, stktop, stklimit,
+		   info->pr, (unsigned long) info->sw, info->sp);
+	STAT(unw.stat.api.init_time += ia64_get_itc() - start; local_irq_restore(flags));
+}
+
+void
+unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t, struct switch_stack *sw)
+{
+	unsigned long sol;
+
+	init_frame_info(info, t, sw, (unsigned long) (sw + 1) - 16);
+	info->cfm_loc = &sw->ar_pfs;
+	sol = (*info->cfm_loc >> 7) & 0x7f;
+	info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->regstk.top, -sol);
+	info->ip = sw->b0;
+	UNW_DPRINT(3, "unwind.%s:\n"
+		   "  bsp    0x%lx\n"
+		   "  sol    0x%lx\n"
+		   "  ip     0x%lx\n",
+		   __func__, info->bsp, sol, info->ip);
+	find_save_locs(info);
+}
+
+EXPORT_SYMBOL(unw_init_frame_info);
+
+void
+unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t)
+{
+	struct switch_stack *sw = (struct switch_stack *) (t->thread.ksp + 16);
+
+	UNW_DPRINT(1, "unwind.%s\n", __func__);
+	unw_init_frame_info(info, t, sw);
+}
+EXPORT_SYMBOL(unw_init_from_blocked_task);
+
+static void
+init_unwind_table (struct unw_table *table, const char *name, unsigned long segment_base,
+		   unsigned long gp, const void *table_start, const void *table_end)
+{
+	const struct unw_table_entry *start = table_start, *end = table_end;
+
+	table->name = name;
+	table->segment_base = segment_base;
+	table->gp = gp;
+	table->start = segment_base + start[0].start_offset;
+	table->end = segment_base + end[-1].end_offset;
+	table->array = start;
+	table->length = end - start;
+}
+
+void *
+unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,
+		      const void *table_start, const void *table_end)
+{
+	const struct unw_table_entry *start = table_start, *end = table_end;
+	struct unw_table *table;
+	unsigned long flags;
+
+	if (end - start <= 0) {
+		UNW_DPRINT(0, "unwind.%s: ignoring attempt to insert empty unwind table\n",
+			   __func__);
+		return NULL;
+	}
+
+	table = kmalloc(sizeof(*table), GFP_USER);
+	if (!table)
+		return NULL;
+
+	init_unwind_table(table, name, segment_base, gp, table_start, table_end);
+
+	spin_lock_irqsave(&unw.lock, flags);
+	{
+		/* keep kernel unwind table at the front (it's searched most commonly): */
+		table->next = unw.tables->next;
+		unw.tables->next = table;
+	}
+	spin_unlock_irqrestore(&unw.lock, flags);
+
+	return table;
+}
+
+void
+unw_remove_unwind_table (void *handle)
+{
+	struct unw_table *table, *prev;
+	struct unw_script *tmp;
+	unsigned long flags;
+	long index;
+
+	if (!handle) {
+		UNW_DPRINT(0, "unwind.%s: ignoring attempt to remove non-existent unwind table\n",
+			   __func__);
+		return;
+	}
+
+	table = handle;
+	if (table == &unw.kernel_table) {
+		UNW_DPRINT(0, "unwind.%s: sorry, freeing the kernel's unwind table is a "
+			   "no-can-do!\n", __func__);
+		return;
+	}
+
+	spin_lock_irqsave(&unw.lock, flags);
+	{
+		/* first, delete the table: */
+
+		for (prev = (struct unw_table *) &unw.tables; prev; prev = prev->next)
+			if (prev->next == table)
+				break;
+		if (!prev) {
+			UNW_DPRINT(0, "unwind.%s: failed to find unwind table %p\n",
+				   __func__, (void *) table);
+			spin_unlock_irqrestore(&unw.lock, flags);
+			return;
+		}
+		prev->next = table->next;
+	}
+	spin_unlock_irqrestore(&unw.lock, flags);
+
+	/* next, remove hash table entries for this table */
+
+	for (index = 0; index < UNW_HASH_SIZE; ++index) {
+		tmp = unw.cache + unw.hash[index];
+		if (unw.hash[index] >= UNW_CACHE_SIZE
+		    || tmp->ip < table->start || tmp->ip >= table->end)
+			continue;
+
+		write_lock(&tmp->lock);
+		{
+			if (tmp->ip >= table->start && tmp->ip < table->end) {
+				unw.hash[index] = tmp->coll_chain;
+				tmp->ip = 0;
+			}
+		}
+		write_unlock(&tmp->lock);
+	}
+
+	kfree(table);
+}
+
+static int __init
+create_gate_table (void)
+{
+	const struct unw_table_entry *entry, *start, *end;
+	unsigned long *lp, segbase = GATE_ADDR;
+	size_t info_size, size;
+	char *info;
+	Elf64_Phdr *punw = NULL, *phdr = (Elf64_Phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
+	int i;
+
+	for (i = 0; i < GATE_EHDR->e_phnum; ++i, ++phdr)
+		if (phdr->p_type == PT_IA_64_UNWIND) {
+			punw = phdr;
+			break;
+		}
+
+	if (!punw) {
+		printk("%s: failed to find gate DSO's unwind table!\n", __func__);
+		return 0;
+	}
+
+	start = (const struct unw_table_entry *) punw->p_vaddr;
+	end = (struct unw_table_entry *) ((char *) start + punw->p_memsz);
+	size  = 0;
+
+	unw_add_unwind_table("linux-gate.so", segbase, 0, start, end);
+
+	for (entry = start; entry < end; ++entry)
+		size += 3*8 + 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset));
+	size += 8;	/* reserve space for "end of table" marker */
+
+	unw.gate_table = kmalloc(size, GFP_KERNEL);
+	if (!unw.gate_table) {
+		unw.gate_table_size = 0;
+		printk(KERN_ERR "%s: unable to create unwind data for gate page!\n", __func__);
+		return 0;
+	}
+	unw.gate_table_size = size;
+
+	lp = unw.gate_table;
+	info = (char *) unw.gate_table + size;
+
+	for (entry = start; entry < end; ++entry, lp += 3) {
+		info_size = 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset));
+		info -= info_size;
+		memcpy(info, (char *) segbase + entry->info_offset, info_size);
+
+		lp[0] = segbase + entry->start_offset;		/* start */
+		lp[1] = segbase + entry->end_offset;		/* end */
+		lp[2] = info - (char *) unw.gate_table;		/* info */
+	}
+	*lp = 0;	/* end-of-table marker */
+	return 0;
+}
+
+__initcall(create_gate_table);
+
+void __init
+unw_init (void)
+{
+	extern char __gp[];
+	extern void unw_hash_index_t_is_too_narrow (void);
+	long i, off;
+
+	if (8*sizeof(unw_hash_index_t) < UNW_LOG_HASH_SIZE)
+		unw_hash_index_t_is_too_narrow();
+
+	unw.sw_off[unw.preg_index[UNW_REG_PRI_UNAT_GR]] = SW(CALLER_UNAT);
+	unw.sw_off[unw.preg_index[UNW_REG_BSPSTORE]] = SW(AR_BSPSTORE);
+	unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_PFS);
+	unw.sw_off[unw.preg_index[UNW_REG_RP]] = SW(B0);
+	unw.sw_off[unw.preg_index[UNW_REG_UNAT]] = SW(CALLER_UNAT);
+	unw.sw_off[unw.preg_index[UNW_REG_PR]] = SW(PR);
+	unw.sw_off[unw.preg_index[UNW_REG_LC]] = SW(AR_LC);
+	unw.sw_off[unw.preg_index[UNW_REG_FPSR]] = SW(AR_FPSR);
+	for (i = UNW_REG_R4, off = SW(R4); i <= UNW_REG_R7; ++i, off += 8)
+		unw.sw_off[unw.preg_index[i]] = off;
+	for (i = UNW_REG_B1, off = SW(B1); i <= UNW_REG_B5; ++i, off += 8)
+		unw.sw_off[unw.preg_index[i]] = off;
+	for (i = UNW_REG_F2, off = SW(F2); i <= UNW_REG_F5; ++i, off += 16)
+		unw.sw_off[unw.preg_index[i]] = off;
+	for (i = UNW_REG_F16, off = SW(F16); i <= UNW_REG_F31; ++i, off += 16)
+		unw.sw_off[unw.preg_index[i]] = off;
+
+	for (i = 0; i < UNW_CACHE_SIZE; ++i) {
+		if (i > 0)
+			unw.cache[i].lru_chain = (i - 1);
+		unw.cache[i].coll_chain = -1;
+		rwlock_init(&unw.cache[i].lock);
+	}
+	unw.lru_head = UNW_CACHE_SIZE - 1;
+	unw.lru_tail = 0;
+
+	init_unwind_table(&unw.kernel_table, "kernel", KERNEL_START, (unsigned long) __gp,
+			  __start_unwind, __end_unwind);
+}
+
+/*
+ * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED
+ *
+ *	This system call has been deprecated.  The new and improved way to get
+ *	at the kernel's unwind info is via the gate DSO.  The address of the
+ *	ELF header for this DSO is passed to user-level via AT_SYSINFO_EHDR.
+ *
+ * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED
+ *
+ * This system call copies the unwind data into the buffer pointed to by BUF and returns
+ * the size of the unwind data.  If BUF_SIZE is smaller than the size of the unwind data
+ * or if BUF is NULL, nothing is copied, but the system call still returns the size of the
+ * unwind data.
+ *
+ * The first portion of the unwind data contains an unwind table and rest contains the
+ * associated unwind info (in no particular order).  The unwind table consists of a table
+ * of entries of the form:
+ *
+ *	u64 start;	(64-bit address of start of function)
+ *	u64 end;	(64-bit address of start of function)
+ *	u64 info;	(BUF-relative offset to unwind info)
+ *
+ * The end of the unwind table is indicated by an entry with a START address of zero.
+ *
+ * Please see the IA-64 Software Conventions and Runtime Architecture manual for details
+ * on the format of the unwind info.
+ *
+ * ERRORS
+ *	EFAULT	BUF points outside your accessible address space.
+ */
+asmlinkage long
+sys_getunwind (void __user *buf, size_t buf_size)
+{
+	if (buf && buf_size >= unw.gate_table_size)
+		if (copy_to_user(buf, unw.gate_table, unw.gate_table_size) != 0)
+			return -EFAULT;
+	return unw.gate_table_size;
+}
diff --git a/arch/ia64/kernel/unwind_decoder.c b/arch/ia64/kernel/unwind_decoder.c
new file mode 100644
index 000000000..83f54f792
--- /dev/null
+++ b/arch/ia64/kernel/unwind_decoder.c
@@ -0,0 +1,460 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2000 Hewlett-Packard Co
+ * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Generic IA-64 unwind info decoder.
+ *
+ * This file is used both by the Linux kernel and objdump.  Please keep
+ * the two copies of this file in sync.
+ *
+ * You need to customize the decoder by defining the following
+ * macros/constants before including this file:
+ *
+ *  Types:
+ *	unw_word	Unsigned integer type with at least 64 bits 
+ *
+ *  Register names:
+ *	UNW_REG_BSP
+ *	UNW_REG_BSPSTORE
+ *	UNW_REG_FPSR
+ *	UNW_REG_LC
+ *	UNW_REG_PFS
+ *	UNW_REG_PR
+ *	UNW_REG_RNAT
+ *	UNW_REG_PSP
+ *	UNW_REG_RP
+ *	UNW_REG_UNAT
+ *
+ *  Decoder action macros:
+ *	UNW_DEC_BAD_CODE(code)
+ *	UNW_DEC_ABI(fmt,abi,context,arg)
+ *	UNW_DEC_BR_GR(fmt,brmask,gr,arg)
+ *	UNW_DEC_BR_MEM(fmt,brmask,arg)
+ *	UNW_DEC_COPY_STATE(fmt,label,arg)
+ *	UNW_DEC_EPILOGUE(fmt,t,ecount,arg)
+ *	UNW_DEC_FRGR_MEM(fmt,grmask,frmask,arg)
+ *	UNW_DEC_FR_MEM(fmt,frmask,arg)
+ *	UNW_DEC_GR_GR(fmt,grmask,gr,arg)
+ *	UNW_DEC_GR_MEM(fmt,grmask,arg)
+ *	UNW_DEC_LABEL_STATE(fmt,label,arg)
+ *	UNW_DEC_MEM_STACK_F(fmt,t,size,arg)
+ *	UNW_DEC_MEM_STACK_V(fmt,t,arg)
+ *	UNW_DEC_PRIUNAT_GR(fmt,r,arg)
+ *	UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg)
+ *	UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg)
+ *	UNW_DEC_PRIUNAT_WHEN_PSPREL(fmt,pspoff,arg)
+ *	UNW_DEC_PRIUNAT_WHEN_SPREL(fmt,spoff,arg)
+ *	UNW_DEC_PROLOGUE(fmt,body,rlen,arg)
+ *	UNW_DEC_PROLOGUE_GR(fmt,rlen,mask,grsave,arg)
+ *	UNW_DEC_REG_PSPREL(fmt,reg,pspoff,arg)
+ *	UNW_DEC_REG_REG(fmt,src,dst,arg)
+ *	UNW_DEC_REG_SPREL(fmt,reg,spoff,arg)
+ *	UNW_DEC_REG_WHEN(fmt,reg,t,arg)
+ *	UNW_DEC_RESTORE(fmt,t,abreg,arg)
+ *	UNW_DEC_RESTORE_P(fmt,qp,t,abreg,arg)
+ *	UNW_DEC_SPILL_BASE(fmt,pspoff,arg)
+ *	UNW_DEC_SPILL_MASK(fmt,imaskp,arg)
+ *	UNW_DEC_SPILL_PSPREL(fmt,t,abreg,pspoff,arg)
+ *	UNW_DEC_SPILL_PSPREL_P(fmt,qp,t,abreg,pspoff,arg)
+ *	UNW_DEC_SPILL_REG(fmt,t,abreg,x,ytreg,arg)
+ *	UNW_DEC_SPILL_REG_P(fmt,qp,t,abreg,x,ytreg,arg)
+ *	UNW_DEC_SPILL_SPREL(fmt,t,abreg,spoff,arg)
+ *	UNW_DEC_SPILL_SPREL_P(fmt,qp,t,abreg,pspoff,arg)
+ */
+
+static unw_word
+unw_decode_uleb128 (unsigned char **dpp)
+{
+  unsigned shift = 0;
+  unw_word byte, result = 0;
+  unsigned char *bp = *dpp;
+
+  while (1)
+    {
+      byte = *bp++;
+      result |= (byte & 0x7f) << shift;
+      if ((byte & 0x80) == 0)
+	break;
+      shift += 7;
+    }
+  *dpp = bp;
+  return result;
+}
+
+static unsigned char *
+unw_decode_x1 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unsigned char byte1, abreg;
+  unw_word t, off;
+
+  byte1 = *dp++;
+  t = unw_decode_uleb128 (&dp);
+  off = unw_decode_uleb128 (&dp);
+  abreg = (byte1 & 0x7f);
+  if (byte1 & 0x80)
+	  UNW_DEC_SPILL_SPREL(X1, t, abreg, off, arg);
+  else
+	  UNW_DEC_SPILL_PSPREL(X1, t, abreg, off, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_x2 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unsigned char byte1, byte2, abreg, x, ytreg;
+  unw_word t;
+
+  byte1 = *dp++; byte2 = *dp++;
+  t = unw_decode_uleb128 (&dp);
+  abreg = (byte1 & 0x7f);
+  ytreg = byte2;
+  x = (byte1 >> 7) & 1;
+  if ((byte1 & 0x80) == 0 && ytreg == 0)
+    UNW_DEC_RESTORE(X2, t, abreg, arg);
+  else
+    UNW_DEC_SPILL_REG(X2, t, abreg, x, ytreg, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_x3 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unsigned char byte1, byte2, abreg, qp;
+  unw_word t, off;
+
+  byte1 = *dp++; byte2 = *dp++;
+  t = unw_decode_uleb128 (&dp);
+  off = unw_decode_uleb128 (&dp);
+
+  qp = (byte1 & 0x3f);
+  abreg = (byte2 & 0x7f);
+
+  if (byte1 & 0x80)
+    UNW_DEC_SPILL_SPREL_P(X3, qp, t, abreg, off, arg);
+  else
+    UNW_DEC_SPILL_PSPREL_P(X3, qp, t, abreg, off, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_x4 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unsigned char byte1, byte2, byte3, qp, abreg, x, ytreg;
+  unw_word t;
+
+  byte1 = *dp++; byte2 = *dp++; byte3 = *dp++;
+  t = unw_decode_uleb128 (&dp);
+
+  qp = (byte1 & 0x3f);
+  abreg = (byte2 & 0x7f);
+  x = (byte2 >> 7) & 1;
+  ytreg = byte3;
+
+  if ((byte2 & 0x80) == 0 && byte3 == 0)
+    UNW_DEC_RESTORE_P(X4, qp, t, abreg, arg);
+  else
+    UNW_DEC_SPILL_REG_P(X4, qp, t, abreg, x, ytreg, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_r1 (unsigned char *dp, unsigned char code, void *arg)
+{
+  int body = (code & 0x20) != 0;
+  unw_word rlen;
+
+  rlen = (code & 0x1f);
+  UNW_DEC_PROLOGUE(R1, body, rlen, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_r2 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unsigned char byte1, mask, grsave;
+  unw_word rlen;
+
+  byte1 = *dp++;
+
+  mask = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
+  grsave = (byte1 & 0x7f);
+  rlen = unw_decode_uleb128 (&dp);
+  UNW_DEC_PROLOGUE_GR(R2, rlen, mask, grsave, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_r3 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unw_word rlen;
+
+  rlen = unw_decode_uleb128 (&dp);
+  UNW_DEC_PROLOGUE(R3, ((code & 0x3) == 1), rlen, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_p1 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unsigned char brmask = (code & 0x1f);
+
+  UNW_DEC_BR_MEM(P1, brmask, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_p2_p5 (unsigned char *dp, unsigned char code, void *arg)
+{
+  if ((code & 0x10) == 0)
+    {
+      unsigned char byte1 = *dp++;
+
+      UNW_DEC_BR_GR(P2, ((code & 0xf) << 1) | ((byte1 >> 7) & 1),
+		    (byte1 & 0x7f), arg);
+    }
+  else if ((code & 0x08) == 0)
+    {
+      unsigned char byte1 = *dp++, r, dst;
+
+      r = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
+      dst = (byte1 & 0x7f);
+      switch (r)
+	{
+	case 0: UNW_DEC_REG_GR(P3, UNW_REG_PSP, dst, arg); break;
+	case 1: UNW_DEC_REG_GR(P3, UNW_REG_RP, dst, arg); break;
+	case 2: UNW_DEC_REG_GR(P3, UNW_REG_PFS, dst, arg); break;
+	case 3: UNW_DEC_REG_GR(P3, UNW_REG_PR, dst, arg); break;
+	case 4: UNW_DEC_REG_GR(P3, UNW_REG_UNAT, dst, arg); break;
+	case 5: UNW_DEC_REG_GR(P3, UNW_REG_LC, dst, arg); break;
+	case 6: UNW_DEC_RP_BR(P3, dst, arg); break;
+	case 7: UNW_DEC_REG_GR(P3, UNW_REG_RNAT, dst, arg); break;
+	case 8: UNW_DEC_REG_GR(P3, UNW_REG_BSP, dst, arg); break;
+	case 9: UNW_DEC_REG_GR(P3, UNW_REG_BSPSTORE, dst, arg); break;
+	case 10: UNW_DEC_REG_GR(P3, UNW_REG_FPSR, dst, arg); break;
+	case 11: UNW_DEC_PRIUNAT_GR(P3, dst, arg); break;
+	default: UNW_DEC_BAD_CODE(r); break;
+	}
+    }
+  else if ((code & 0x7) == 0)
+    UNW_DEC_SPILL_MASK(P4, dp, arg);
+  else if ((code & 0x7) == 1)
+    {
+      unw_word grmask, frmask, byte1, byte2, byte3;
+
+      byte1 = *dp++; byte2 = *dp++; byte3 = *dp++;
+      grmask = ((byte1 >> 4) & 0xf);
+      frmask = ((byte1 & 0xf) << 16) | (byte2 << 8) | byte3;
+      UNW_DEC_FRGR_MEM(P5, grmask, frmask, arg);
+    }
+  else
+    UNW_DEC_BAD_CODE(code);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_p6 (unsigned char *dp, unsigned char code, void *arg)
+{
+  int gregs = (code & 0x10) != 0;
+  unsigned char mask = (code & 0x0f);
+
+  if (gregs)
+    UNW_DEC_GR_MEM(P6, mask, arg);
+  else
+    UNW_DEC_FR_MEM(P6, mask, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_p7_p10 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unsigned char r, byte1, byte2;
+  unw_word t, size;
+
+  if ((code & 0x10) == 0)
+    {
+      r = (code & 0xf);
+      t = unw_decode_uleb128 (&dp);
+      switch (r)
+	{
+	case 0:
+	  size = unw_decode_uleb128 (&dp);
+	  UNW_DEC_MEM_STACK_F(P7, t, size, arg);
+	  break;
+
+	case 1: UNW_DEC_MEM_STACK_V(P7, t, arg); break;
+	case 2: UNW_DEC_SPILL_BASE(P7, t, arg); break;
+	case 3: UNW_DEC_REG_SPREL(P7, UNW_REG_PSP, t, arg); break;
+	case 4: UNW_DEC_REG_WHEN(P7, UNW_REG_RP, t, arg); break;
+	case 5: UNW_DEC_REG_PSPREL(P7, UNW_REG_RP, t, arg); break;
+	case 6: UNW_DEC_REG_WHEN(P7, UNW_REG_PFS, t, arg); break;
+	case 7: UNW_DEC_REG_PSPREL(P7, UNW_REG_PFS, t, arg); break;
+	case 8: UNW_DEC_REG_WHEN(P7, UNW_REG_PR, t, arg); break;
+	case 9: UNW_DEC_REG_PSPREL(P7, UNW_REG_PR, t, arg); break;
+	case 10: UNW_DEC_REG_WHEN(P7, UNW_REG_LC, t, arg); break;
+	case 11: UNW_DEC_REG_PSPREL(P7, UNW_REG_LC, t, arg); break;
+	case 12: UNW_DEC_REG_WHEN(P7, UNW_REG_UNAT, t, arg); break;
+	case 13: UNW_DEC_REG_PSPREL(P7, UNW_REG_UNAT, t, arg); break;
+	case 14: UNW_DEC_REG_WHEN(P7, UNW_REG_FPSR, t, arg); break;
+	case 15: UNW_DEC_REG_PSPREL(P7, UNW_REG_FPSR, t, arg); break;
+	default: UNW_DEC_BAD_CODE(r); break;
+	}
+    }
+  else
+    {
+      switch (code & 0xf)
+	{
+	case 0x0: /* p8 */
+	  {
+	    r = *dp++;
+	    t = unw_decode_uleb128 (&dp);
+	    switch (r)
+	      {
+	      case  1: UNW_DEC_REG_SPREL(P8, UNW_REG_RP, t, arg); break;
+	      case  2: UNW_DEC_REG_SPREL(P8, UNW_REG_PFS, t, arg); break;
+	      case  3: UNW_DEC_REG_SPREL(P8, UNW_REG_PR, t, arg); break;
+	      case  4: UNW_DEC_REG_SPREL(P8, UNW_REG_LC, t, arg); break;
+	      case  5: UNW_DEC_REG_SPREL(P8, UNW_REG_UNAT, t, arg); break;
+	      case  6: UNW_DEC_REG_SPREL(P8, UNW_REG_FPSR, t, arg); break;
+	      case  7: UNW_DEC_REG_WHEN(P8, UNW_REG_BSP, t, arg); break;
+	      case  8: UNW_DEC_REG_PSPREL(P8, UNW_REG_BSP, t, arg); break;
+	      case  9: UNW_DEC_REG_SPREL(P8, UNW_REG_BSP, t, arg); break;
+	      case 10: UNW_DEC_REG_WHEN(P8, UNW_REG_BSPSTORE, t, arg); break;
+	      case 11: UNW_DEC_REG_PSPREL(P8, UNW_REG_BSPSTORE, t, arg); break;
+	      case 12: UNW_DEC_REG_SPREL(P8, UNW_REG_BSPSTORE, t, arg); break;
+	      case 13: UNW_DEC_REG_WHEN(P8, UNW_REG_RNAT, t, arg); break;
+	      case 14: UNW_DEC_REG_PSPREL(P8, UNW_REG_RNAT, t, arg); break;
+	      case 15: UNW_DEC_REG_SPREL(P8, UNW_REG_RNAT, t, arg); break;
+	      case 16: UNW_DEC_PRIUNAT_WHEN_GR(P8, t, arg); break;
+	      case 17: UNW_DEC_PRIUNAT_PSPREL(P8, t, arg); break;
+	      case 18: UNW_DEC_PRIUNAT_SPREL(P8, t, arg); break;
+	      case 19: UNW_DEC_PRIUNAT_WHEN_MEM(P8, t, arg); break;
+	      default: UNW_DEC_BAD_CODE(r); break;
+	    }
+	  }
+	  break;
+
+	case 0x1:
+	  byte1 = *dp++; byte2 = *dp++;
+	  UNW_DEC_GR_GR(P9, (byte1 & 0xf), (byte2 & 0x7f), arg);
+	  break;
+
+	case 0xf: /* p10 */
+	  byte1 = *dp++; byte2 = *dp++;
+	  UNW_DEC_ABI(P10, byte1, byte2, arg);
+	  break;
+
+	case 0x9:
+	  return unw_decode_x1 (dp, code, arg);
+
+	case 0xa:
+	  return unw_decode_x2 (dp, code, arg);
+
+	case 0xb:
+	  return unw_decode_x3 (dp, code, arg);
+
+	case 0xc:
+	  return unw_decode_x4 (dp, code, arg);
+
+	default:
+	  UNW_DEC_BAD_CODE(code);
+	  break;
+	}
+    }
+  return dp;
+}
+
+static unsigned char *
+unw_decode_b1 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unw_word label = (code & 0x1f);
+
+  if ((code & 0x20) != 0)
+    UNW_DEC_COPY_STATE(B1, label, arg);
+  else
+    UNW_DEC_LABEL_STATE(B1, label, arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_b2 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unw_word t;
+
+  t = unw_decode_uleb128 (&dp);
+  UNW_DEC_EPILOGUE(B2, t, (code & 0x1f), arg);
+  return dp;
+}
+
+static unsigned char *
+unw_decode_b3_x4 (unsigned char *dp, unsigned char code, void *arg)
+{
+  unw_word t, ecount, label;
+
+  if ((code & 0x10) == 0)
+    {
+      t = unw_decode_uleb128 (&dp);
+      ecount = unw_decode_uleb128 (&dp);
+      UNW_DEC_EPILOGUE(B3, t, ecount, arg);
+    }
+  else if ((code & 0x07) == 0)
+    {
+      label = unw_decode_uleb128 (&dp);
+      if ((code & 0x08) != 0)
+	UNW_DEC_COPY_STATE(B4, label, arg);
+      else
+	UNW_DEC_LABEL_STATE(B4, label, arg);
+    }
+  else
+    switch (code & 0x7)
+      {
+      case 1: return unw_decode_x1 (dp, code, arg);
+      case 2: return unw_decode_x2 (dp, code, arg);
+      case 3: return unw_decode_x3 (dp, code, arg);
+      case 4: return unw_decode_x4 (dp, code, arg);
+      default: UNW_DEC_BAD_CODE(code); break;
+      }
+  return dp;
+}
+
+typedef unsigned char *(*unw_decoder) (unsigned char *, unsigned char, void *);
+
+static unw_decoder unw_decode_table[2][8] =
+{
+  /* prologue table: */
+  {
+    unw_decode_r1,	/* 0 */
+    unw_decode_r1,
+    unw_decode_r2,
+    unw_decode_r3,
+    unw_decode_p1,	/* 4 */
+    unw_decode_p2_p5,
+    unw_decode_p6,
+    unw_decode_p7_p10
+  },
+  {
+    unw_decode_r1,	/* 0 */
+    unw_decode_r1,
+    unw_decode_r2,
+    unw_decode_r3,
+    unw_decode_b1,	/* 4 */
+    unw_decode_b1,
+    unw_decode_b2,
+    unw_decode_b3_x4
+  }
+};
+
+/*
+ * Decode one descriptor and return address of next descriptor.
+ */
+static inline unsigned char *
+unw_decode (unsigned char *dp, int inside_body, void *arg)
+{
+  unw_decoder decoder;
+  unsigned char code;
+
+  code = *dp++;
+  decoder = unw_decode_table[inside_body][code >> 5];
+  dp = (*decoder) (dp, code, arg);
+  return dp;
+}
diff --git a/arch/ia64/kernel/unwind_i.h b/arch/ia64/kernel/unwind_i.h
new file mode 100644
index 000000000..1dd57ba44
--- /dev/null
+++ b/arch/ia64/kernel/unwind_i.h
@@ -0,0 +1,165 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Kernel unwind support.
+ */
+
+#define UNW_VER(x)		((x) >> 48)
+#define UNW_FLAG_MASK		0x0000ffff00000000
+#define UNW_FLAG_OSMASK		0x0000f00000000000
+#define UNW_FLAG_EHANDLER(x)	((x) & 0x0000000100000000L)
+#define UNW_FLAG_UHANDLER(x)	((x) & 0x0000000200000000L)
+#define UNW_LENGTH(x)		((x) & 0x00000000ffffffffL)
+
+enum unw_register_index {
+	/* primary unat: */
+	UNW_REG_PRI_UNAT_GR,
+	UNW_REG_PRI_UNAT_MEM,
+
+	/* register stack */
+	UNW_REG_BSP,					/* register stack pointer */
+	UNW_REG_BSPSTORE,
+	UNW_REG_PFS,					/* previous function state */
+	UNW_REG_RNAT,
+	/* memory stack */
+	UNW_REG_PSP,					/* previous memory stack pointer */
+	/* return pointer: */
+	UNW_REG_RP,
+
+	/* preserved registers: */
+	UNW_REG_R4, UNW_REG_R5, UNW_REG_R6, UNW_REG_R7,
+	UNW_REG_UNAT, UNW_REG_PR, UNW_REG_LC, UNW_REG_FPSR,
+	UNW_REG_B1, UNW_REG_B2, UNW_REG_B3, UNW_REG_B4, UNW_REG_B5,
+	UNW_REG_F2, UNW_REG_F3, UNW_REG_F4, UNW_REG_F5,
+	UNW_REG_F16, UNW_REG_F17, UNW_REG_F18, UNW_REG_F19,
+	UNW_REG_F20, UNW_REG_F21, UNW_REG_F22, UNW_REG_F23,
+	UNW_REG_F24, UNW_REG_F25, UNW_REG_F26, UNW_REG_F27,
+	UNW_REG_F28, UNW_REG_F29, UNW_REG_F30, UNW_REG_F31,
+	UNW_NUM_REGS
+};
+
+struct unw_info_block {
+	u64 header;
+	u64 desc[];		/* unwind descriptors */
+	/* personality routine and language-specific data follow behind descriptors */
+};
+
+struct unw_table {
+	struct unw_table *next;		/* must be first member! */
+	const char *name;
+	unsigned long gp;		/* global pointer for this load-module */
+	unsigned long segment_base;	/* base for offsets in the unwind table entries */
+	unsigned long start;
+	unsigned long end;
+	const struct unw_table_entry *array;
+	unsigned long length;
+};
+
+enum unw_where {
+	UNW_WHERE_NONE,			/* register isn't saved at all */
+	UNW_WHERE_GR,			/* register is saved in a general register */
+	UNW_WHERE_FR,			/* register is saved in a floating-point register */
+	UNW_WHERE_BR,			/* register is saved in a branch register */
+	UNW_WHERE_SPREL,		/* register is saved on memstack (sp-relative) */
+	UNW_WHERE_PSPREL,		/* register is saved on memstack (psp-relative) */
+	/*
+	 * At the end of each prologue these locations get resolved to
+	 * UNW_WHERE_PSPREL and UNW_WHERE_GR, respectively:
+	 */
+	UNW_WHERE_SPILL_HOME,		/* register is saved in its spill home */
+	UNW_WHERE_GR_SAVE		/* register is saved in next general register */
+};
+
+#define UNW_WHEN_NEVER	0x7fffffff
+
+struct unw_reg_info {
+	unsigned long val;		/* save location: register number or offset */
+	enum unw_where where;		/* where the register gets saved */
+	int when;			/* when the register gets saved */
+};
+
+struct unw_reg_state {
+	struct unw_reg_state *next;		/* next (outer) element on state stack */
+	struct unw_reg_info reg[UNW_NUM_REGS];	/* register save locations */
+};
+
+struct unw_labeled_state {
+	struct unw_labeled_state *next;		/* next labeled state (or NULL) */
+	unsigned long label;			/* label for this state */
+	struct unw_reg_state saved_state;
+};
+
+struct unw_state_record {
+	unsigned int first_region : 1;	/* is this the first region? */
+	unsigned int done : 1;		/* are we done scanning descriptors? */
+	unsigned int any_spills : 1;	/* got any register spills? */
+	unsigned int in_body : 1;	/* are we inside a body (as opposed to a prologue)? */
+	unsigned long flags;		/* see UNW_FLAG_* in unwind.h */
+
+	u8 *imask;			/* imask of spill_mask record or NULL */
+	unsigned long pr_val;		/* predicate values */
+	unsigned long pr_mask;		/* predicate mask */
+	long spill_offset;		/* psp-relative offset for spill base */
+	int region_start;
+	int region_len;
+	int epilogue_start;
+	int epilogue_count;
+	int when_target;
+
+	u8 gr_save_loc;			/* next general register to use for saving a register */
+	u8 return_link_reg;		/* branch register in which the return link is passed */
+
+	struct unw_labeled_state *labeled_states;	/* list of all labeled states */
+	struct unw_reg_state curr;	/* current state */
+};
+
+enum unw_nat_type {
+	UNW_NAT_NONE,		/* NaT not represented */
+	UNW_NAT_VAL,		/* NaT represented by NaT value (fp reg) */
+	UNW_NAT_MEMSTK,		/* NaT value is in unat word at offset OFF  */
+	UNW_NAT_REGSTK		/* NaT is in rnat */
+};
+
+enum unw_insn_opcode {
+	UNW_INSN_ADD,			/* s[dst] += val */
+	UNW_INSN_ADD_PSP,		/* s[dst] = (s.psp + val) */
+	UNW_INSN_ADD_SP,		/* s[dst] = (s.sp + val) */
+	UNW_INSN_MOVE,			/* s[dst] = s[val] */
+	UNW_INSN_MOVE2,			/* s[dst] = s[val]; s[dst+1] = s[val+1] */
+	UNW_INSN_MOVE_STACKED,		/* s[dst] = ia64_rse_skip(*s.bsp, val) */
+	UNW_INSN_SETNAT_MEMSTK,		/* s[dst+1].nat.type = MEMSTK;
+					   s[dst+1].nat.off = *s.pri_unat - s[dst] */
+	UNW_INSN_SETNAT_TYPE,		/* s[dst+1].nat.type = val */
+	UNW_INSN_LOAD,			/* s[dst] = *s[val] */
+	UNW_INSN_MOVE_SCRATCH,		/* s[dst] = scratch reg "val" */
+	UNW_INSN_MOVE_CONST,            /* s[dst] = constant reg "val" */
+};
+
+struct unw_insn {
+	unsigned int opc	:  4;
+	unsigned int dst	:  9;
+	signed int val		: 19;
+};
+
+/*
+ * Preserved general static registers (r4-r7) give rise to two script
+ * instructions; everything else yields at most one instruction; at
+ * the end of the script, the psp gets popped, accounting for one more
+ * instruction.
+ */
+#define UNW_MAX_SCRIPT_LEN	(UNW_NUM_REGS + 5)
+
+struct unw_script {
+	unsigned long ip;		/* ip this script is for */
+	unsigned long pr_mask;		/* mask of predicates script depends on */
+	unsigned long pr_val;		/* predicate values this script is for */
+	rwlock_t lock;
+	unsigned int flags;		/* see UNW_FLAG_* in unwind.h */
+	unsigned short lru_chain;	/* used for least-recently-used chain */
+	unsigned short coll_chain;	/* used for hash collisions */
+	unsigned short hint;		/* hint for next script to try (or -1) */
+	unsigned short count;		/* number of instructions in script */
+	struct unw_insn insn[UNW_MAX_SCRIPT_LEN];
+};
diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S
new file mode 100644
index 000000000..9b265783b
--- /dev/null
+++ b/arch/ia64/kernel/vmlinux.lds.S
@@ -0,0 +1,225 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/pgtable.h>
+#include <asm/cache.h>
+#include <asm/ptrace.h>
+#include <asm/thread_info.h>
+
+#define EMITS_PT_NOTE
+#define RO_EXCEPTION_TABLE_ALIGN	16
+
+#include <asm-generic/vmlinux.lds.h>
+
+OUTPUT_FORMAT("elf64-ia64-little")
+OUTPUT_ARCH(ia64)
+ENTRY(phys_start)
+jiffies = jiffies_64;
+
+PHDRS {
+	text   PT_LOAD;
+	percpu PT_LOAD;
+	data   PT_LOAD;
+	note   PT_NOTE;
+	unwind 0x70000001; /* PT_IA_64_UNWIND, but ld doesn't match the name */
+}
+
+SECTIONS {
+	/*
+	 * unwind exit sections must be discarded before
+	 * the rest of the sections get included.
+	 */
+	/DISCARD/ : {
+		*(.IA_64.unwind.exit.text)
+		*(.IA_64.unwind_info.exit.text)
+		*(.comment)
+		*(.note)
+	}
+
+	v = PAGE_OFFSET; /* this symbol is here to make debugging easier... */
+	phys_start = _start - LOAD_OFFSET;
+
+	code : {
+	} :text
+	. = KERNEL_START;
+
+	_text = .;
+	_stext = .;
+
+	.text : AT(ADDR(.text) - LOAD_OFFSET) {
+		__start_ivt_text = .;
+		*(.text..ivt)
+		__end_ivt_text = .;
+		TEXT_TEXT
+		SCHED_TEXT
+		CPUIDLE_TEXT
+		LOCK_TEXT
+		KPROBES_TEXT
+		IRQENTRY_TEXT
+		SOFTIRQENTRY_TEXT
+		*(.gnu.linkonce.t*)
+	}
+
+	.text2 : AT(ADDR(.text2) - LOAD_OFFSET)	{
+		*(.text2)
+	}
+
+#ifdef CONFIG_SMP
+	.text..lock : AT(ADDR(.text..lock) - LOAD_OFFSET) {
+		*(.text..lock)
+	}
+#endif
+	_etext = .;
+
+	/*
+	 * Read-only data
+	 */
+
+	/* MCA table */
+	. = ALIGN(16);
+	__mca_table : AT(ADDR(__mca_table) - LOAD_OFFSET) {
+		__start___mca_table = .;
+		*(__mca_table)
+		__stop___mca_table = .;
+	}
+
+	.data..patch.phys_stack_reg : AT(ADDR(.data..patch.phys_stack_reg) - LOAD_OFFSET) {
+		__start___phys_stack_reg_patchlist = .;
+		*(.data..patch.phys_stack_reg)
+		__end___phys_stack_reg_patchlist = .;
+	}
+
+	/*
+	 * Global data
+	 */
+	_data = .;
+
+	/* Unwind info & table: */
+	. = ALIGN(8);
+	.IA_64.unwind_info : AT(ADDR(.IA_64.unwind_info) - LOAD_OFFSET) {
+		*(.IA_64.unwind_info*)
+	}
+	.IA_64.unwind : AT(ADDR(.IA_64.unwind) - LOAD_OFFSET) {
+		__start_unwind = .;
+		*(.IA_64.unwind*)
+		__end_unwind = .;
+	} :text :unwind
+	code_continues2 : {
+	} :text
+
+	RO_DATA(4096)
+
+	.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
+		__start_opd = .;
+		*(.opd)
+		__end_opd = .;
+	}
+
+	/*
+	 * Initialization code and data:
+	 */
+	. = ALIGN(PAGE_SIZE);
+	__init_begin = .;
+
+	INIT_TEXT_SECTION(PAGE_SIZE)
+	INIT_DATA_SECTION(16)
+
+	.data..patch.vtop : AT(ADDR(.data..patch.vtop) - LOAD_OFFSET) {
+		__start___vtop_patchlist = .;
+		*(.data..patch.vtop)
+		__end___vtop_patchlist = .;
+	}
+
+	.data..patch.rse : AT(ADDR(.data..patch.rse) - LOAD_OFFSET) {
+		__start___rse_patchlist = .;
+		*(.data..patch.rse)
+		__end___rse_patchlist = .;
+	}
+
+	.data..patch.mckinley_e9 : AT(ADDR(.data..patch.mckinley_e9) - LOAD_OFFSET) {
+		__start___mckinley_e9_bundles = .;
+		*(.data..patch.mckinley_e9)
+		__end___mckinley_e9_bundles = .;
+	}
+
+#ifdef	CONFIG_SMP
+	. = ALIGN(PERCPU_PAGE_SIZE);
+	__cpu0_per_cpu = .;
+	. = . + PERCPU_PAGE_SIZE;   /* cpu0 per-cpu space */
+#endif
+
+	. = ALIGN(PAGE_SIZE);
+	__init_end = .;
+
+	.data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
+		PAGE_ALIGNED_DATA(PAGE_SIZE)
+		. = ALIGN(PAGE_SIZE);
+		__start_gate_section = .;
+		*(.data..gate)
+		__stop_gate_section = .;
+	}
+	/*
+	 * make sure the gate page doesn't expose
+	 * kernel data
+	 */
+	. = ALIGN(PAGE_SIZE);
+
+	/* Per-cpu data: */
+	. = ALIGN(PERCPU_PAGE_SIZE);
+	PERCPU_VADDR(SMP_CACHE_BYTES, PERCPU_ADDR, :percpu)
+	__phys_per_cpu_start = __per_cpu_load;
+	/*
+	 * ensure percpu data fits
+	 * into percpu page size
+	 */
+	. = __phys_per_cpu_start + PERCPU_PAGE_SIZE;
+
+	data : {
+	} :data
+	.data : AT(ADDR(.data) - LOAD_OFFSET) {
+		_sdata  =  .;
+		INIT_TASK_DATA(PAGE_SIZE)
+		CACHELINE_ALIGNED_DATA(SMP_CACHE_BYTES)
+		READ_MOSTLY_DATA(SMP_CACHE_BYTES)
+		DATA_DATA
+		*(.data1)
+		*(.gnu.linkonce.d*)
+		CONSTRUCTORS
+	}
+
+	BUG_TABLE
+
+	. = ALIGN(16);	/* gp must be 16-byte aligned for exc. table */
+	.got : AT(ADDR(.got) - LOAD_OFFSET) {
+		*(.got.plt)
+		*(.got)
+	}
+	__gp = ADDR(.got) + 0x200000;
+
+	/*
+	 * We want the small data sections together,
+	 * so single-instruction offsets can access
+	 * them all, and initialized data all before
+	 * uninitialized, so we can shorten the
+	 * on-disk segment size.
+	 */
+	.sdata : AT(ADDR(.sdata) - LOAD_OFFSET) {
+		*(.sdata)
+		*(.sdata1)
+		*(.srdata)
+	}
+	_edata  =  .;
+
+	BSS_SECTION(0, 0, 0)
+
+	_end = .;
+
+	code : {
+	} :text
+
+	STABS_DEBUG
+	DWARF_DEBUG
+	ELF_DETAILS
+
+	/* Default discards */
+	DISCARDS
+}