summaryrefslogtreecommitdiffstats
path: root/arch/arm/kernel/setup.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/kernel/setup.c')
-rw-r--r--arch/arm/kernel/setup.c1350
1 files changed, 1350 insertions, 0 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
new file mode 100644
index 000000000..cb88c6e69
--- /dev/null
+++ b/arch/arm/kernel/setup.c
@@ -0,0 +1,1350 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/arch/arm/kernel/setup.c
+ *
+ * Copyright (C) 1995-2001 Russell King
+ */
+#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/seq_file.h>
+#include <linux/screen_info.h>
+#include <linux/of_platform.h>
+#include <linux/init.h>
+#include <linux/kexec.h>
+#include <linux/libfdt.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 <asm/kasan.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[4];
+ u32 abt[4];
+ u32 und[4];
+ u32 fiq[4];
+} ____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",
+ 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)
+{
+ phys_addr_t start, end, res_end;
+ struct resource *res;
+ u64 i;
+
+ 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_mem_range(i, &start, &end) {
+ unsigned long boot_alias_start;
+
+ /*
+ * In memblock, end points to the first byte after the
+ * range while in resourses, end points to the last byte in
+ * the range.
+ */
+ res_end = end - 1;
+
+ /*
+ * 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_alloc(sizeof(*res), SMP_CACHE_BYTES);
+ if (!res)
+ panic("%s: Failed to allocate %zu bytes\n",
+ __func__, sizeof(*res));
+ res->name = "System RAM (boot alias)";
+ res->start = boot_alias_start;
+ res->end = phys_to_idmap(res_end);
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ request_resource(&iomem_resource, res);
+ }
+
+ res = memblock_alloc(sizeof(*res), SMP_CACHE_BYTES);
+ if (!res)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ sizeof(*res));
+ res->name = "System RAM";
+ res->start = start;
+ res->end = res_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);
+ /* invalid value specified or crashkernel=0 */
+ if (ret || !crash_size)
+ 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_phys_alloc_range(crash_size, CRASH_ALIGN,
+ CRASH_ALIGN, crash_max);
+ if (!crash_base) {
+ pr_err("crashkernel reservation failed - No suitable area found.\n");
+ return;
+ }
+ } else {
+ unsigned long long crash_max = crash_base + crash_size;
+ unsigned long long start;
+
+ start = memblock_phys_alloc_range(crash_size, SECTION_SIZE,
+ crash_base, crash_max);
+ if (!start) {
+ pr_err("crashkernel reservation failed - memory is in use.\n");
+ 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
+}
+
+static void (*__arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
+
+static int arm_restart(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ __arm_pm_restart(action, data);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block arm_restart_nb = {
+ .notifier_call = arm_restart,
+ .priority = 128,
+};
+
+void __init setup_arch(char **cmdline_p)
+{
+ const struct machine_desc *mdesc = NULL;
+ void *atags_vaddr = NULL;
+
+ if (__atags_pointer)
+ atags_vaddr = FDT_VIRT_BASE(__atags_pointer);
+
+ setup_processor();
+ if (atags_vaddr) {
+ mdesc = setup_machine_fdt(atags_vaddr);
+ if (mdesc)
+ memblock_reserve(__atags_pointer,
+ fdt_totalsize(atags_vaddr));
+ }
+ if (!mdesc)
+ mdesc = setup_machine_tags(atags_vaddr, __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, atags_vaddr);
+ 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;
+
+ setup_initial_init_mm(_text, _etext, _edata, _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();
+ arm_efi_init();
+ /*
+ * Make sure the calculation for lowmem/highmem is set appropriately
+ * before reserving/allocating any memory
+ */
+ 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);
+ kasan_init();
+ request_standard_resources(mdesc);
+
+ if (mdesc->restart) {
+ __arm_pm_restart = mdesc->restart;
+ register_restart_handler(&arm_restart_nb);
+ }
+
+ 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;
+#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
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-27 07:45:19 +0000