Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 911 insertions, 0 deletions

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
new file mode 100644
index 000000000..e2af6b172
--- /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 when IA64 starts to support suspend...
+ */
+int acpi_suspend_lowlevel(void) { return 0; }