Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 1325 insertions, 0 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
new file mode 100644
index 000000000..95db057ed
--- /dev/null
+++ b/arch/arm/kernel/setup.c
@@ -0,0 +1,1325 @@
+/*
+ *  linux/arch/arm/kernel/setup.c
+ *
+ *  Copyright (C) 1995-2001 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/efi.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/utsname.h>
+#include <linux/initrd.h>
+#include <linux/console.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/screen_info.h>
+#include <linux/of_platform.h>
+#include <linux/init.h>
+#include <linux/kexec.h>
+#include <linux/of_fdt.h>
+#include <linux/cpu.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/proc_fs.h>
+#include <linux/memblock.h>
+#include <linux/bug.h>
+#include <linux/compiler.h>
+#include <linux/sort.h>
+#include <linux/psci.h>
+
+#include <asm/unified.h>
+#include <asm/cp15.h>
+#include <asm/cpu.h>
+#include <asm/cputype.h>
+#include <asm/efi.h>
+#include <asm/elf.h>
+#include <asm/early_ioremap.h>
+#include <asm/fixmap.h>
+#include <asm/procinfo.h>
+#include <asm/psci.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/smp_plat.h>
+#include <asm/mach-types.h>
+#include <asm/cacheflush.h>
+#include <asm/cachetype.h>
+#include <asm/tlbflush.h>
+#include <asm/xen/hypervisor.h>
+
+#include <asm/prom.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/time.h>
+#include <asm/system_info.h>
+#include <asm/system_misc.h>
+#include <asm/traps.h>
+#include <asm/unwind.h>
+#include <asm/memblock.h>
+#include <asm/virt.h>
+
+#include "atags.h"
+
+
+#if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
+char fpe_type[8];
+
+static int __init fpe_setup(char *line)
+{
+	memcpy(fpe_type, line, 8);
+	return 1;
+}
+
+__setup("fpe=", fpe_setup);
+#endif
+
+extern void init_default_cache_policy(unsigned long);
+extern void paging_init(const struct machine_desc *desc);
+extern void early_mm_init(const struct machine_desc *);
+extern void adjust_lowmem_bounds(void);
+extern enum reboot_mode reboot_mode;
+extern void setup_dma_zone(const struct machine_desc *desc);
+
+unsigned int processor_id;
+EXPORT_SYMBOL(processor_id);
+unsigned int __machine_arch_type __read_mostly;
+EXPORT_SYMBOL(__machine_arch_type);
+unsigned int cacheid __read_mostly;
+EXPORT_SYMBOL(cacheid);
+
+unsigned int __atags_pointer __initdata;
+
+unsigned int system_rev;
+EXPORT_SYMBOL(system_rev);
+
+const char *system_serial;
+EXPORT_SYMBOL(system_serial);
+
+unsigned int system_serial_low;
+EXPORT_SYMBOL(system_serial_low);
+
+unsigned int system_serial_high;
+EXPORT_SYMBOL(system_serial_high);
+
+unsigned int elf_hwcap __read_mostly;
+EXPORT_SYMBOL(elf_hwcap);
+
+unsigned int elf_hwcap2 __read_mostly;
+EXPORT_SYMBOL(elf_hwcap2);
+
+
+#ifdef MULTI_CPU
+struct processor processor __ro_after_init;
+#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
+struct processor *cpu_vtable[NR_CPUS] = {
+	[0] = &processor,
+};
+#endif
+#endif
+#ifdef MULTI_TLB
+struct cpu_tlb_fns cpu_tlb __ro_after_init;
+#endif
+#ifdef MULTI_USER
+struct cpu_user_fns cpu_user __ro_after_init;
+#endif
+#ifdef MULTI_CACHE
+struct cpu_cache_fns cpu_cache __ro_after_init;
+#endif
+#ifdef CONFIG_OUTER_CACHE
+struct outer_cache_fns outer_cache __ro_after_init;
+EXPORT_SYMBOL(outer_cache);
+#endif
+
+/*
+ * Cached cpu_architecture() result for use by assembler code.
+ * C code should use the cpu_architecture() function instead of accessing this
+ * variable directly.
+ */
+int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
+
+struct stack {
+	u32 irq[3];
+	u32 abt[3];
+	u32 und[3];
+	u32 fiq[3];
+} ____cacheline_aligned;
+
+#ifndef CONFIG_CPU_V7M
+static struct stack stacks[NR_CPUS];
+#endif
+
+char elf_platform[ELF_PLATFORM_SIZE];
+EXPORT_SYMBOL(elf_platform);
+
+static const char *cpu_name;
+static const char *machine_name;
+static char __initdata cmd_line[COMMAND_LINE_SIZE];
+const struct machine_desc *machine_desc __initdata;
+
+static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
+#define ENDIANNESS ((char)endian_test.l)
+
+DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
+
+/*
+ * Standard memory resources
+ */
+static struct resource mem_res[] = {
+	{
+		.name = "Video RAM",
+		.start = 0,
+		.end = 0,
+		.flags = IORESOURCE_MEM
+	},
+	{
+		.name = "Kernel code",
+		.start = 0,
+		.end = 0,
+		.flags = IORESOURCE_SYSTEM_RAM
+	},
+	{
+		.name = "Kernel data",
+		.start = 0,
+		.end = 0,
+		.flags = IORESOURCE_SYSTEM_RAM
+	}
+};
+
+#define video_ram   mem_res[0]
+#define kernel_code mem_res[1]
+#define kernel_data mem_res[2]
+
+static struct resource io_res[] = {
+	{
+		.name = "reserved",
+		.start = 0x3bc,
+		.end = 0x3be,
+		.flags = IORESOURCE_IO | IORESOURCE_BUSY
+	},
+	{
+		.name = "reserved",
+		.start = 0x378,
+		.end = 0x37f,
+		.flags = IORESOURCE_IO | IORESOURCE_BUSY
+	},
+	{
+		.name = "reserved",
+		.start = 0x278,
+		.end = 0x27f,
+		.flags = IORESOURCE_IO | IORESOURCE_BUSY
+	}
+};
+
+#define lp0 io_res[0]
+#define lp1 io_res[1]
+#define lp2 io_res[2]
+
+static const char *proc_arch[] = {
+	"undefined/unknown",
+	"3",
+	"4",
+	"4T",
+	"5",
+	"5T",
+	"5TE",
+	"5TEJ",
+	"6TEJ",
+	"7",
+	"7M",
+	"?(12)",
+	"?(13)",
+	"?(14)",
+	"?(15)",
+	"?(16)",
+	"?(17)",
+};
+
+#ifdef CONFIG_CPU_V7M
+static int __get_cpu_architecture(void)
+{
+	return CPU_ARCH_ARMv7M;
+}
+#else
+static int __get_cpu_architecture(void)
+{
+	int cpu_arch;
+
+	if ((read_cpuid_id() & 0x0008f000) == 0) {
+		cpu_arch = CPU_ARCH_UNKNOWN;
+	} else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
+		cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
+	} else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
+		cpu_arch = (read_cpuid_id() >> 16) & 7;
+		if (cpu_arch)
+			cpu_arch += CPU_ARCH_ARMv3;
+	} else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
+		/* Revised CPUID format. Read the Memory Model Feature
+		 * Register 0 and check for VMSAv7 or PMSAv7 */
+		unsigned int mmfr0 = read_cpuid_ext(CPUID_EXT_MMFR0);
+		if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
+		    (mmfr0 & 0x000000f0) >= 0x00000030)
+			cpu_arch = CPU_ARCH_ARMv7;
+		else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
+			 (mmfr0 & 0x000000f0) == 0x00000020)
+			cpu_arch = CPU_ARCH_ARMv6;
+		else
+			cpu_arch = CPU_ARCH_UNKNOWN;
+	} else
+		cpu_arch = CPU_ARCH_UNKNOWN;
+
+	return cpu_arch;
+}
+#endif
+
+int __pure cpu_architecture(void)
+{
+	BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
+
+	return __cpu_architecture;
+}
+
+static int cpu_has_aliasing_icache(unsigned int arch)
+{
+	int aliasing_icache;
+	unsigned int id_reg, num_sets, line_size;
+
+	/* PIPT caches never alias. */
+	if (icache_is_pipt())
+		return 0;
+
+	/* arch specifies the register format */
+	switch (arch) {
+	case CPU_ARCH_ARMv7:
+		set_csselr(CSSELR_ICACHE | CSSELR_L1);
+		isb();
+		id_reg = read_ccsidr();
+		line_size = 4 << ((id_reg & 0x7) + 2);
+		num_sets = ((id_reg >> 13) & 0x7fff) + 1;
+		aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
+		break;
+	case CPU_ARCH_ARMv6:
+		aliasing_icache = read_cpuid_cachetype() & (1 << 11);
+		break;
+	default:
+		/* I-cache aliases will be handled by D-cache aliasing code */
+		aliasing_icache = 0;
+	}
+
+	return aliasing_icache;
+}
+
+static void __init cacheid_init(void)
+{
+	unsigned int arch = cpu_architecture();
+
+	if (arch >= CPU_ARCH_ARMv6) {
+		unsigned int cachetype = read_cpuid_cachetype();
+
+		if ((arch == CPU_ARCH_ARMv7M) && !(cachetype & 0xf000f)) {
+			cacheid = 0;
+		} else if ((cachetype & (7 << 29)) == 4 << 29) {
+			/* ARMv7 register format */
+			arch = CPU_ARCH_ARMv7;
+			cacheid = CACHEID_VIPT_NONALIASING;
+			switch (cachetype & (3 << 14)) {
+			case (1 << 14):
+				cacheid |= CACHEID_ASID_TAGGED;
+				break;
+			case (3 << 14):
+				cacheid |= CACHEID_PIPT;
+				break;
+			}
+		} else {
+			arch = CPU_ARCH_ARMv6;
+			if (cachetype & (1 << 23))
+				cacheid = CACHEID_VIPT_ALIASING;
+			else
+				cacheid = CACHEID_VIPT_NONALIASING;
+		}
+		if (cpu_has_aliasing_icache(arch))
+			cacheid |= CACHEID_VIPT_I_ALIASING;
+	} else {
+		cacheid = CACHEID_VIVT;
+	}
+
+	pr_info("CPU: %s data cache, %s instruction cache\n",
+		cache_is_vivt() ? "VIVT" :
+		cache_is_vipt_aliasing() ? "VIPT aliasing" :
+		cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
+		cache_is_vivt() ? "VIVT" :
+		icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
+		icache_is_vipt_aliasing() ? "VIPT aliasing" :
+		icache_is_pipt() ? "PIPT" :
+		cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
+}
+
+/*
+ * These functions re-use the assembly code in head.S, which
+ * already provide the required functionality.
+ */
+extern struct proc_info_list *lookup_processor_type(unsigned int);
+
+void __init early_print(const char *str, ...)
+{
+	extern void printascii(const char *);
+	char buf[256];
+	va_list ap;
+
+	va_start(ap, str);
+	vsnprintf(buf, sizeof(buf), str, ap);
+	va_end(ap);
+
+#ifdef CONFIG_DEBUG_LL
+	printascii(buf);
+#endif
+	printk("%s", buf);
+}
+
+#ifdef CONFIG_ARM_PATCH_IDIV
+
+static inline u32 __attribute_const__ sdiv_instruction(void)
+{
+	if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
+		/* "sdiv r0, r0, r1" */
+		u32 insn = __opcode_thumb32_compose(0xfb90, 0xf0f1);
+		return __opcode_to_mem_thumb32(insn);
+	}
+
+	/* "sdiv r0, r0, r1" */
+	return __opcode_to_mem_arm(0xe710f110);
+}
+
+static inline u32 __attribute_const__ udiv_instruction(void)
+{
+	if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
+		/* "udiv r0, r0, r1" */
+		u32 insn = __opcode_thumb32_compose(0xfbb0, 0xf0f1);
+		return __opcode_to_mem_thumb32(insn);
+	}
+
+	/* "udiv r0, r0, r1" */
+	return __opcode_to_mem_arm(0xe730f110);
+}
+
+static inline u32 __attribute_const__ bx_lr_instruction(void)
+{
+	if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
+		/* "bx lr; nop" */
+		u32 insn = __opcode_thumb32_compose(0x4770, 0x46c0);
+		return __opcode_to_mem_thumb32(insn);
+	}
+
+	/* "bx lr" */
+	return __opcode_to_mem_arm(0xe12fff1e);
+}
+
+static void __init patch_aeabi_idiv(void)
+{
+	extern void __aeabi_uidiv(void);
+	extern void __aeabi_idiv(void);
+	uintptr_t fn_addr;
+	unsigned int mask;
+
+	mask = IS_ENABLED(CONFIG_THUMB2_KERNEL) ? HWCAP_IDIVT : HWCAP_IDIVA;
+	if (!(elf_hwcap & mask))
+		return;
+
+	pr_info("CPU: div instructions available: patching division code\n");
+
+	fn_addr = ((uintptr_t)&__aeabi_uidiv) & ~1;
+	asm ("" : "+g" (fn_addr));
+	((u32 *)fn_addr)[0] = udiv_instruction();
+	((u32 *)fn_addr)[1] = bx_lr_instruction();
+	flush_icache_range(fn_addr, fn_addr + 8);
+
+	fn_addr = ((uintptr_t)&__aeabi_idiv) & ~1;
+	asm ("" : "+g" (fn_addr));
+	((u32 *)fn_addr)[0] = sdiv_instruction();
+	((u32 *)fn_addr)[1] = bx_lr_instruction();
+	flush_icache_range(fn_addr, fn_addr + 8);
+}
+
+#else
+static inline void patch_aeabi_idiv(void) { }
+#endif
+
+static void __init cpuid_init_hwcaps(void)
+{
+	int block;
+	u32 isar5;
+
+	if (cpu_architecture() < CPU_ARCH_ARMv7)
+		return;
+
+	block = cpuid_feature_extract(CPUID_EXT_ISAR0, 24);
+	if (block >= 2)
+		elf_hwcap |= HWCAP_IDIVA;
+	if (block >= 1)
+		elf_hwcap |= HWCAP_IDIVT;
+
+	/* LPAE implies atomic ldrd/strd instructions */
+	block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
+	if (block >= 5)
+		elf_hwcap |= HWCAP_LPAE;
+
+	/* check for supported v8 Crypto instructions */
+	isar5 = read_cpuid_ext(CPUID_EXT_ISAR5);
+
+	block = cpuid_feature_extract_field(isar5, 4);
+	if (block >= 2)
+		elf_hwcap2 |= HWCAP2_PMULL;
+	if (block >= 1)
+		elf_hwcap2 |= HWCAP2_AES;
+
+	block = cpuid_feature_extract_field(isar5, 8);
+	if (block >= 1)
+		elf_hwcap2 |= HWCAP2_SHA1;
+
+	block = cpuid_feature_extract_field(isar5, 12);
+	if (block >= 1)
+		elf_hwcap2 |= HWCAP2_SHA2;
+
+	block = cpuid_feature_extract_field(isar5, 16);
+	if (block >= 1)
+		elf_hwcap2 |= HWCAP2_CRC32;
+}
+
+static void __init elf_hwcap_fixup(void)
+{
+	unsigned id = read_cpuid_id();
+
+	/*
+	 * HWCAP_TLS is available only on 1136 r1p0 and later,
+	 * see also kuser_get_tls_init.
+	 */
+	if (read_cpuid_part() == ARM_CPU_PART_ARM1136 &&
+	    ((id >> 20) & 3) == 0) {
+		elf_hwcap &= ~HWCAP_TLS;
+		return;
+	}
+
+	/* Verify if CPUID scheme is implemented */
+	if ((id & 0x000f0000) != 0x000f0000)
+		return;
+
+	/*
+	 * If the CPU supports LDREX/STREX and LDREXB/STREXB,
+	 * avoid advertising SWP; it may not be atomic with
+	 * multiprocessing cores.
+	 */
+	if (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) > 1 ||
+	    (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) == 1 &&
+	     cpuid_feature_extract(CPUID_EXT_ISAR4, 20) >= 3))
+		elf_hwcap &= ~HWCAP_SWP;
+}
+
+/*
+ * cpu_init - initialise one CPU.
+ *
+ * cpu_init sets up the per-CPU stacks.
+ */
+void notrace cpu_init(void)
+{
+#ifndef CONFIG_CPU_V7M
+	unsigned int cpu = smp_processor_id();
+	struct stack *stk = &stacks[cpu];
+
+	if (cpu >= NR_CPUS) {
+		pr_crit("CPU%u: bad primary CPU number\n", cpu);
+		BUG();
+	}
+
+	/*
+	 * This only works on resume and secondary cores. For booting on the
+	 * boot cpu, smp_prepare_boot_cpu is called after percpu area setup.
+	 */
+	set_my_cpu_offset(per_cpu_offset(cpu));
+
+	cpu_proc_init();
+
+	/*
+	 * Define the placement constraint for the inline asm directive below.
+	 * In Thumb-2, msr with an immediate value is not allowed.
+	 */
+#ifdef CONFIG_THUMB2_KERNEL
+#define PLC_l	"l"
+#define PLC_r	"r"
+#else
+#define PLC_l	"I"
+#define PLC_r	"I"
+#endif
+
+	/*
+	 * setup stacks for re-entrant exception handlers
+	 */
+	__asm__ (
+	"msr	cpsr_c, %1\n\t"
+	"add	r14, %0, %2\n\t"
+	"mov	sp, r14\n\t"
+	"msr	cpsr_c, %3\n\t"
+	"add	r14, %0, %4\n\t"
+	"mov	sp, r14\n\t"
+	"msr	cpsr_c, %5\n\t"
+	"add	r14, %0, %6\n\t"
+	"mov	sp, r14\n\t"
+	"msr	cpsr_c, %7\n\t"
+	"add	r14, %0, %8\n\t"
+	"mov	sp, r14\n\t"
+	"msr	cpsr_c, %9"
+	    :
+	    : "r" (stk),
+	      PLC_r (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
+	      "I" (offsetof(struct stack, irq[0])),
+	      PLC_r (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
+	      "I" (offsetof(struct stack, abt[0])),
+	      PLC_r (PSR_F_BIT | PSR_I_BIT | UND_MODE),
+	      "I" (offsetof(struct stack, und[0])),
+	      PLC_r (PSR_F_BIT | PSR_I_BIT | FIQ_MODE),
+	      "I" (offsetof(struct stack, fiq[0])),
+	      PLC_l (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
+	    : "r14");
+#endif
+}
+
+u32 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
+
+void __init smp_setup_processor_id(void)
+{
+	int i;
+	u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
+	u32 cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+
+	cpu_logical_map(0) = cpu;
+	for (i = 1; i < nr_cpu_ids; ++i)
+		cpu_logical_map(i) = i == cpu ? 0 : i;
+
+	/*
+	 * clear __my_cpu_offset on boot CPU to avoid hang caused by
+	 * using percpu variable early, for example, lockdep will
+	 * access percpu variable inside lock_release
+	 */
+	set_my_cpu_offset(0);
+
+	pr_info("Booting Linux on physical CPU 0x%x\n", mpidr);
+}
+
+struct mpidr_hash mpidr_hash;
+#ifdef CONFIG_SMP
+/**
+ * smp_build_mpidr_hash - Pre-compute shifts required at each affinity
+ *			  level in order to build a linear index from an
+ *			  MPIDR value. Resulting algorithm is a collision
+ *			  free hash carried out through shifting and ORing
+ */
+static void __init smp_build_mpidr_hash(void)
+{
+	u32 i, affinity;
+	u32 fs[3], bits[3], ls, mask = 0;
+	/*
+	 * Pre-scan the list of MPIDRS and filter out bits that do
+	 * not contribute to affinity levels, ie they never toggle.
+	 */
+	for_each_possible_cpu(i)
+		mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
+	pr_debug("mask of set bits 0x%x\n", mask);
+	/*
+	 * Find and stash the last and first bit set at all affinity levels to
+	 * check how many bits are required to represent them.
+	 */
+	for (i = 0; i < 3; i++) {
+		affinity = MPIDR_AFFINITY_LEVEL(mask, i);
+		/*
+		 * Find the MSB bit and LSB bits position
+		 * to determine how many bits are required
+		 * to express the affinity level.
+		 */
+		ls = fls(affinity);
+		fs[i] = affinity ? ffs(affinity) - 1 : 0;
+		bits[i] = ls - fs[i];
+	}
+	/*
+	 * An index can be created from the MPIDR by isolating the
+	 * significant bits at each affinity level and by shifting
+	 * them in order to compress the 24 bits values space to a
+	 * compressed set of values. This is equivalent to hashing
+	 * the MPIDR through shifting and ORing. It is a collision free
+	 * hash though not minimal since some levels might contain a number
+	 * of CPUs that is not an exact power of 2 and their bit
+	 * representation might contain holes, eg MPIDR[7:0] = {0x2, 0x80}.
+	 */
+	mpidr_hash.shift_aff[0] = fs[0];
+	mpidr_hash.shift_aff[1] = MPIDR_LEVEL_BITS + fs[1] - bits[0];
+	mpidr_hash.shift_aff[2] = 2*MPIDR_LEVEL_BITS + fs[2] -
+						(bits[1] + bits[0]);
+	mpidr_hash.mask = mask;
+	mpidr_hash.bits = bits[2] + bits[1] + bits[0];
+	pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] mask[0x%x] bits[%u]\n",
+				mpidr_hash.shift_aff[0],
+				mpidr_hash.shift_aff[1],
+				mpidr_hash.shift_aff[2],
+				mpidr_hash.mask,
+				mpidr_hash.bits);
+	/*
+	 * 4x is an arbitrary value used to warn on a hash table much bigger
+	 * than expected on most systems.
+	 */
+	if (mpidr_hash_size() > 4 * num_possible_cpus())
+		pr_warn("Large number of MPIDR hash buckets detected\n");
+	sync_cache_w(&mpidr_hash);
+}
+#endif
+
+/*
+ * locate processor in the list of supported processor types.  The linker
+ * builds this table for us from the entries in arch/arm/mm/proc-*.S
+ */
+struct proc_info_list *lookup_processor(u32 midr)
+{
+	struct proc_info_list *list = lookup_processor_type(midr);
+
+	if (!list) {
+		pr_err("CPU%u: configuration botched (ID %08x), CPU halted\n",
+		       smp_processor_id(), midr);
+		while (1)
+		/* can't use cpu_relax() here as it may require MMU setup */;
+	}
+
+	return list;
+}
+
+static void __init setup_processor(void)
+{
+	unsigned int midr = read_cpuid_id();
+	struct proc_info_list *list = lookup_processor(midr);
+
+	cpu_name = list->cpu_name;
+	__cpu_architecture = __get_cpu_architecture();
+
+	init_proc_vtable(list->proc);
+#ifdef MULTI_TLB
+	cpu_tlb = *list->tlb;
+#endif
+#ifdef MULTI_USER
+	cpu_user = *list->user;
+#endif
+#ifdef MULTI_CACHE
+	cpu_cache = *list->cache;
+#endif
+
+	pr_info("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
+		list->cpu_name, midr, midr & 15,
+		proc_arch[cpu_architecture()], get_cr());
+
+	snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
+		 list->arch_name, ENDIANNESS);
+	snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
+		 list->elf_name, ENDIANNESS);
+	elf_hwcap = list->elf_hwcap;
+
+	cpuid_init_hwcaps();
+	patch_aeabi_idiv();
+
+#ifndef CONFIG_ARM_THUMB
+	elf_hwcap &= ~(HWCAP_THUMB | HWCAP_IDIVT);
+#endif
+#ifdef CONFIG_MMU
+	init_default_cache_policy(list->__cpu_mm_mmu_flags);
+#endif
+	erratum_a15_798181_init();
+
+	elf_hwcap_fixup();
+
+	cacheid_init();
+	cpu_init();
+}
+
+void __init dump_machine_table(void)
+{
+	const struct machine_desc *p;
+
+	early_print("Available machine support:\n\nID (hex)\tNAME\n");
+	for_each_machine_desc(p)
+		early_print("%08x\t%s\n", p->nr, p->name);
+
+	early_print("\nPlease check your kernel config and/or bootloader.\n");
+
+	while (true)
+		/* can't use cpu_relax() here as it may require MMU setup */;
+}
+
+int __init arm_add_memory(u64 start, u64 size)
+{
+	u64 aligned_start;
+
+	/*
+	 * Ensure that start/size are aligned to a page boundary.
+	 * Size is rounded down, start is rounded up.
+	 */
+	aligned_start = PAGE_ALIGN(start);
+	if (aligned_start > start + size)
+		size = 0;
+	else
+		size -= aligned_start - start;
+
+#ifndef CONFIG_PHYS_ADDR_T_64BIT
+	if (aligned_start > ULONG_MAX) {
+		pr_crit("Ignoring memory at 0x%08llx outside 32-bit physical address space\n",
+			(long long)start);
+		return -EINVAL;
+	}
+
+	if (aligned_start + size > ULONG_MAX) {
+		pr_crit("Truncating memory at 0x%08llx to fit in 32-bit physical address space\n",
+			(long long)start);
+		/*
+		 * To ensure bank->start + bank->size is representable in
+		 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
+		 * This means we lose a page after masking.
+		 */
+		size = ULONG_MAX - aligned_start;
+	}
+#endif
+
+	if (aligned_start < PHYS_OFFSET) {
+		if (aligned_start + size <= PHYS_OFFSET) {
+			pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
+				aligned_start, aligned_start + size);
+			return -EINVAL;
+		}
+
+		pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
+			aligned_start, (u64)PHYS_OFFSET);
+
+		size -= PHYS_OFFSET - aligned_start;
+		aligned_start = PHYS_OFFSET;
+	}
+
+	start = aligned_start;
+	size = size & ~(phys_addr_t)(PAGE_SIZE - 1);
+
+	/*
+	 * Check whether this memory region has non-zero size or
+	 * invalid node number.
+	 */
+	if (size == 0)
+		return -EINVAL;
+
+	memblock_add(start, size);
+	return 0;
+}
+
+/*
+ * Pick out the memory size.  We look for mem=size@start,
+ * where start and size are "size[KkMm]"
+ */
+
+static int __init early_mem(char *p)
+{
+	static int usermem __initdata = 0;
+	u64 size;
+	u64 start;
+	char *endp;
+
+	/*
+	 * If the user specifies memory size, we
+	 * blow away any automatically generated
+	 * size.
+	 */
+	if (usermem == 0) {
+		usermem = 1;
+		memblock_remove(memblock_start_of_DRAM(),
+			memblock_end_of_DRAM() - memblock_start_of_DRAM());
+	}
+
+	start = PHYS_OFFSET;
+	size  = memparse(p, &endp);
+	if (*endp == '@')
+		start = memparse(endp + 1, NULL);
+
+	arm_add_memory(start, size);
+
+	return 0;
+}
+early_param("mem", early_mem);
+
+static void __init request_standard_resources(const struct machine_desc *mdesc)
+{
+	struct memblock_region *region;
+	struct resource *res;
+
+	kernel_code.start   = virt_to_phys(_text);
+	kernel_code.end     = virt_to_phys(__init_begin - 1);
+	kernel_data.start   = virt_to_phys(_sdata);
+	kernel_data.end     = virt_to_phys(_end - 1);
+
+	for_each_memblock(memory, region) {
+		phys_addr_t start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
+		phys_addr_t end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+		unsigned long boot_alias_start;
+
+		/*
+		 * Some systems have a special memory alias which is only
+		 * used for booting.  We need to advertise this region to
+		 * kexec-tools so they know where bootable RAM is located.
+		 */
+		boot_alias_start = phys_to_idmap(start);
+		if (arm_has_idmap_alias() && boot_alias_start != IDMAP_INVALID_ADDR) {
+			res = memblock_virt_alloc(sizeof(*res), 0);
+			res->name = "System RAM (boot alias)";
+			res->start = boot_alias_start;
+			res->end = phys_to_idmap(end);
+			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+			request_resource(&iomem_resource, res);
+		}
+
+		res = memblock_virt_alloc(sizeof(*res), 0);
+		res->name  = "System RAM";
+		res->start = start;
+		res->end = end;
+		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+		request_resource(&iomem_resource, res);
+
+		if (kernel_code.start >= res->start &&
+		    kernel_code.end <= res->end)
+			request_resource(res, &kernel_code);
+		if (kernel_data.start >= res->start &&
+		    kernel_data.end <= res->end)
+			request_resource(res, &kernel_data);
+	}
+
+	if (mdesc->video_start) {
+		video_ram.start = mdesc->video_start;
+		video_ram.end   = mdesc->video_end;
+		request_resource(&iomem_resource, &video_ram);
+	}
+
+	/*
+	 * Some machines don't have the possibility of ever
+	 * possessing lp0, lp1 or lp2
+	 */
+	if (mdesc->reserve_lp0)
+		request_resource(&ioport_resource, &lp0);
+	if (mdesc->reserve_lp1)
+		request_resource(&ioport_resource, &lp1);
+	if (mdesc->reserve_lp2)
+		request_resource(&ioport_resource, &lp2);
+}
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) || \
+    defined(CONFIG_EFI)
+struct screen_info screen_info = {
+ .orig_video_lines	= 30,
+ .orig_video_cols	= 80,
+ .orig_video_mode	= 0,
+ .orig_video_ega_bx	= 0,
+ .orig_video_isVGA	= 1,
+ .orig_video_points	= 8
+};
+#endif
+
+static int __init customize_machine(void)
+{
+	/*
+	 * customizes platform devices, or adds new ones
+	 * On DT based machines, we fall back to populating the
+	 * machine from the device tree, if no callback is provided,
+	 * otherwise we would always need an init_machine callback.
+	 */
+	if (machine_desc->init_machine)
+		machine_desc->init_machine();
+
+	return 0;
+}
+arch_initcall(customize_machine);
+
+static int __init init_machine_late(void)
+{
+	struct device_node *root;
+	int ret;
+
+	if (machine_desc->init_late)
+		machine_desc->init_late();
+
+	root = of_find_node_by_path("/");
+	if (root) {
+		ret = of_property_read_string(root, "serial-number",
+					      &system_serial);
+		if (ret)
+			system_serial = NULL;
+	}
+
+	if (!system_serial)
+		system_serial = kasprintf(GFP_KERNEL, "%08x%08x",
+					  system_serial_high,
+					  system_serial_low);
+
+	return 0;
+}
+late_initcall(init_machine_late);
+
+#ifdef CONFIG_KEXEC
+/*
+ * The crash region must be aligned to 128MB to avoid
+ * zImage relocating below the reserved region.
+ */
+#define CRASH_ALIGN	(128 << 20)
+
+static inline unsigned long long get_total_mem(void)
+{
+	unsigned long total;
+
+	total = max_low_pfn - min_low_pfn;
+	return total << PAGE_SHIFT;
+}
+
+/**
+ * reserve_crashkernel() - reserves memory are for crash kernel
+ *
+ * This function reserves memory area given in "crashkernel=" kernel command
+ * line parameter. The memory reserved is used by a dump capture kernel when
+ * primary kernel is crashing.
+ */
+static void __init reserve_crashkernel(void)
+{
+	unsigned long long crash_size, crash_base;
+	unsigned long long total_mem;
+	int ret;
+
+	total_mem = get_total_mem();
+	ret = parse_crashkernel(boot_command_line, total_mem,
+				&crash_size, &crash_base);
+	if (ret)
+		return;
+
+	if (crash_base <= 0) {
+		unsigned long long crash_max = idmap_to_phys((u32)~0);
+		unsigned long long lowmem_max = __pa(high_memory - 1) + 1;
+		if (crash_max > lowmem_max)
+			crash_max = lowmem_max;
+		crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max,
+						    crash_size, CRASH_ALIGN);
+		if (!crash_base) {
+			pr_err("crashkernel reservation failed - No suitable area found.\n");
+			return;
+		}
+	} else {
+		unsigned long long start;
+
+		start = memblock_find_in_range(crash_base,
+					       crash_base + crash_size,
+					       crash_size, SECTION_SIZE);
+		if (start != crash_base) {
+			pr_err("crashkernel reservation failed - memory is in use.\n");
+			return;
+		}
+	}
+
+	ret = memblock_reserve(crash_base, crash_size);
+	if (ret < 0) {
+		pr_warn("crashkernel reservation failed - memory is in use (0x%lx)\n",
+			(unsigned long)crash_base);
+		return;
+	}
+
+	pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
+		(unsigned long)(crash_size >> 20),
+		(unsigned long)(crash_base >> 20),
+		(unsigned long)(total_mem >> 20));
+
+	/* The crashk resource must always be located in normal mem */
+	crashk_res.start = crash_base;
+	crashk_res.end = crash_base + crash_size - 1;
+	insert_resource(&iomem_resource, &crashk_res);
+
+	if (arm_has_idmap_alias()) {
+		/*
+		 * If we have a special RAM alias for use at boot, we
+		 * need to advertise to kexec tools where the alias is.
+		 */
+		static struct resource crashk_boot_res = {
+			.name = "Crash kernel (boot alias)",
+			.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
+		};
+
+		crashk_boot_res.start = phys_to_idmap(crash_base);
+		crashk_boot_res.end = crashk_boot_res.start + crash_size - 1;
+		insert_resource(&iomem_resource, &crashk_boot_res);
+	}
+}
+#else
+static inline void reserve_crashkernel(void) {}
+#endif /* CONFIG_KEXEC */
+
+void __init hyp_mode_check(void)
+{
+#ifdef CONFIG_ARM_VIRT_EXT
+	sync_boot_mode();
+
+	if (is_hyp_mode_available()) {
+		pr_info("CPU: All CPU(s) started in HYP mode.\n");
+		pr_info("CPU: Virtualization extensions available.\n");
+	} else if (is_hyp_mode_mismatched()) {
+		pr_warn("CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x%x)\n",
+			__boot_cpu_mode & MODE_MASK);
+		pr_warn("CPU: This may indicate a broken bootloader or firmware.\n");
+	} else
+		pr_info("CPU: All CPU(s) started in SVC mode.\n");
+#endif
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+	const struct machine_desc *mdesc;
+
+	setup_processor();
+	mdesc = setup_machine_fdt(__atags_pointer);
+	if (!mdesc)
+		mdesc = setup_machine_tags(__atags_pointer, __machine_arch_type);
+	if (!mdesc) {
+		early_print("\nError: invalid dtb and unrecognized/unsupported machine ID\n");
+		early_print("  r1=0x%08x, r2=0x%08x\n", __machine_arch_type,
+			    __atags_pointer);
+		if (__atags_pointer)
+			early_print("  r2[]=%*ph\n", 16,
+				    phys_to_virt(__atags_pointer));
+		dump_machine_table();
+	}
+
+	machine_desc = mdesc;
+	machine_name = mdesc->name;
+	dump_stack_set_arch_desc("%s", mdesc->name);
+
+	if (mdesc->reboot_mode != REBOOT_HARD)
+		reboot_mode = mdesc->reboot_mode;
+
+	init_mm.start_code = (unsigned long) _text;
+	init_mm.end_code   = (unsigned long) _etext;
+	init_mm.end_data   = (unsigned long) _edata;
+	init_mm.brk	   = (unsigned long) _end;
+
+	/* populate cmd_line too for later use, preserving boot_command_line */
+	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
+	*cmdline_p = cmd_line;
+
+	early_fixmap_init();
+	early_ioremap_init();
+
+	parse_early_param();
+
+#ifdef CONFIG_MMU
+	early_mm_init(mdesc);
+#endif
+	setup_dma_zone(mdesc);
+	xen_early_init();
+	efi_init();
+	/*
+	 * Make sure the calculation for lowmem/highmem is set appropriately
+	 * before reserving/allocating any mmeory
+	 */
+	adjust_lowmem_bounds();
+	arm_memblock_init(mdesc);
+	/* Memory may have been removed so recalculate the bounds. */
+	adjust_lowmem_bounds();
+
+	early_ioremap_reset();
+
+	paging_init(mdesc);
+	request_standard_resources(mdesc);
+
+	if (mdesc->restart)
+		arm_pm_restart = mdesc->restart;
+
+	unflatten_device_tree();
+
+	arm_dt_init_cpu_maps();
+	psci_dt_init();
+#ifdef CONFIG_SMP
+	if (is_smp()) {
+		if (!mdesc->smp_init || !mdesc->smp_init()) {
+			if (psci_smp_available())
+				smp_set_ops(&psci_smp_ops);
+			else if (mdesc->smp)
+				smp_set_ops(mdesc->smp);
+		}
+		smp_init_cpus();
+		smp_build_mpidr_hash();
+	}
+#endif
+
+	if (!is_smp())
+		hyp_mode_check();
+
+	reserve_crashkernel();
+
+#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
+	handle_arch_irq = mdesc->handle_irq;
+#endif
+
+#ifdef CONFIG_VT
+#if defined(CONFIG_VGA_CONSOLE)
+	conswitchp = &vga_con;
+#elif defined(CONFIG_DUMMY_CONSOLE)
+	conswitchp = &dummy_con;
+#endif
+#endif
+
+	if (mdesc->init_early)
+		mdesc->init_early();
+}
+
+
+static int __init topology_init(void)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
+		cpuinfo->cpu.hotpluggable = platform_can_hotplug_cpu(cpu);
+		register_cpu(&cpuinfo->cpu, cpu);
+	}
+
+	return 0;
+}
+subsys_initcall(topology_init);
+
+#ifdef CONFIG_HAVE_PROC_CPU
+static int __init proc_cpu_init(void)
+{
+	struct proc_dir_entry *res;
+
+	res = proc_mkdir("cpu", NULL);
+	if (!res)
+		return -ENOMEM;
+	return 0;
+}
+fs_initcall(proc_cpu_init);
+#endif
+
+static const char *hwcap_str[] = {
+	"swp",
+	"half",
+	"thumb",
+	"26bit",
+	"fastmult",
+	"fpa",
+	"vfp",
+	"edsp",
+	"java",
+	"iwmmxt",
+	"crunch",
+	"thumbee",
+	"neon",
+	"vfpv3",
+	"vfpv3d16",
+	"tls",
+	"vfpv4",
+	"idiva",
+	"idivt",
+	"vfpd32",
+	"lpae",
+	"evtstrm",
+	NULL
+};
+
+static const char *hwcap2_str[] = {
+	"aes",
+	"pmull",
+	"sha1",
+	"sha2",
+	"crc32",
+	NULL
+};
+
+static int c_show(struct seq_file *m, void *v)
+{
+	int i, j;
+	u32 cpuid;
+
+	for_each_online_cpu(i) {
+		/*
+		 * glibc reads /proc/cpuinfo to determine the number of
+		 * online processors, looking for lines beginning with
+		 * "processor".  Give glibc what it expects.
+		 */
+		seq_printf(m, "processor\t: %d\n", i);
+		cpuid = is_smp() ? per_cpu(cpu_data, i).cpuid : read_cpuid_id();
+		seq_printf(m, "model name\t: %s rev %d (%s)\n",
+			   cpu_name, cpuid & 15, elf_platform);
+
+#if defined(CONFIG_SMP)
+		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
+			   per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
+			   (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
+#else
+		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
+			   loops_per_jiffy / (500000/HZ),
+			   (loops_per_jiffy / (5000/HZ)) % 100);
+#endif
+		/* dump out the processor features */
+		seq_puts(m, "Features\t: ");
+
+		for (j = 0; hwcap_str[j]; j++)
+			if (elf_hwcap & (1 << j))
+				seq_printf(m, "%s ", hwcap_str[j]);
+
+		for (j = 0; hwcap2_str[j]; j++)
+			if (elf_hwcap2 & (1 << j))
+				seq_printf(m, "%s ", hwcap2_str[j]);
+
+		seq_printf(m, "\nCPU implementer\t: 0x%02x\n", cpuid >> 24);
+		seq_printf(m, "CPU architecture: %s\n",
+			   proc_arch[cpu_architecture()]);
+
+		if ((cpuid & 0x0008f000) == 0x00000000) {
+			/* pre-ARM7 */
+			seq_printf(m, "CPU part\t: %07x\n", cpuid >> 4);
+		} else {
+			if ((cpuid & 0x0008f000) == 0x00007000) {
+				/* ARM7 */
+				seq_printf(m, "CPU variant\t: 0x%02x\n",
+					   (cpuid >> 16) & 127);
+			} else {
+				/* post-ARM7 */
+				seq_printf(m, "CPU variant\t: 0x%x\n",
+					   (cpuid >> 20) & 15);
+			}
+			seq_printf(m, "CPU part\t: 0x%03x\n",
+				   (cpuid >> 4) & 0xfff);
+		}
+		seq_printf(m, "CPU revision\t: %d\n\n", cpuid & 15);
+	}
+
+	seq_printf(m, "Hardware\t: %s\n", machine_name);
+	seq_printf(m, "Revision\t: %04x\n", system_rev);
+	seq_printf(m, "Serial\t\t: %s\n", system_serial);
+
+	return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+	return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	++*pos;
+	return NULL;
+}
+
+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	= c_show
+};