diff options
Diffstat (limited to 'arch/arm64/kernel/setup.c')
-rw-r--r-- | arch/arm64/kernel/setup.c | 99 |
1 files changed, 73 insertions, 26 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index c4ec05d4baab..90c4c129f71a 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -42,6 +42,7 @@ #include <linux/of_fdt.h> #include <linux/of_platform.h> #include <linux/efi.h> +#include <linux/personality.h> #include <asm/fixmap.h> #include <asm/cputype.h> @@ -77,7 +78,6 @@ unsigned int compat_elf_hwcap2 __read_mostly; #endif static const char *cpu_name; -static const char *machine_name; phys_addr_t __fdt_pointer __initdata; /* @@ -197,6 +197,19 @@ static void __init smp_build_mpidr_hash(void) } #endif +struct cpuinfo_arm64 { + struct cpu cpu; + u32 reg_midr; +}; + +static DEFINE_PER_CPU(struct cpuinfo_arm64, cpu_data); + +void cpuinfo_store_cpu(void) +{ + struct cpuinfo_arm64 *info = this_cpu_ptr(&cpu_data); + info->reg_midr = read_cpuid_id(); +} + static void __init setup_processor(void) { struct cpu_info *cpu_info; @@ -217,6 +230,8 @@ static void __init setup_processor(void) sprintf(init_utsname()->machine, ELF_PLATFORM); elf_hwcap = 0; + cpuinfo_store_cpu(); + /* * ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks. * The blocks we test below represent incremental functionality @@ -293,8 +308,6 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys) while (true) cpu_relax(); } - - machine_name = of_flat_dt_get_machine_name(); } /* @@ -404,14 +417,12 @@ static int __init arm64_device_init(void) } arch_initcall_sync(arm64_device_init); -static DEFINE_PER_CPU(struct cpu, cpu_data); - static int __init topology_init(void) { int i; for_each_possible_cpu(i) { - struct cpu *cpu = &per_cpu(cpu_data, i); + struct cpu *cpu = &per_cpu(cpu_data.cpu, i); cpu->hotpluggable = 1; register_cpu(cpu, i); } @@ -432,14 +443,41 @@ static const char *hwcap_str[] = { NULL }; +#ifdef CONFIG_COMPAT +static const char *compat_hwcap_str[] = { + "swp", + "half", + "thumb", + "26bit", + "fastmult", + "fpa", + "vfp", + "edsp", + "java", + "iwmmxt", + "crunch", + "thumbee", + "neon", + "vfpv3", + "vfpv3d16", + "tls", + "vfpv4", + "idiva", + "idivt", + "vfpd32", + "lpae", + "evtstrm" +}; +#endif /* CONFIG_COMPAT */ + static int c_show(struct seq_file *m, void *v) { - int i; - - seq_printf(m, "Processor\t: %s rev %d (%s)\n", - cpu_name, read_cpuid_id() & 15, ELF_PLATFORM); + int i, j; for_each_online_cpu(i) { + struct cpuinfo_arm64 *cpuinfo = &per_cpu(cpu_data, i); + u32 midr = cpuinfo->reg_midr; + /* * glibc reads /proc/cpuinfo to determine the number of * online processors, looking for lines beginning with @@ -448,24 +486,33 @@ static int c_show(struct seq_file *m, void *v) #ifdef CONFIG_SMP seq_printf(m, "processor\t: %d\n", i); #endif - } - - /* dump out the processor features */ - seq_puts(m, "Features\t: "); - - for (i = 0; hwcap_str[i]; i++) - if (elf_hwcap & (1 << i)) - seq_printf(m, "%s ", hwcap_str[i]); - seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); - seq_printf(m, "CPU architecture: AArch64\n"); - seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15); - seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff); - seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); - - seq_puts(m, "\n"); + /* + * Dump out the common processor features in a single line. + * Userspace should read the hwcaps with getauxval(AT_HWCAP) + * rather than attempting to parse this, but there's a body of + * software which does already (at least for 32-bit). + */ + seq_puts(m, "Features\t:"); + if (personality(current->personality) == PER_LINUX32) { +#ifdef CONFIG_COMPAT + for (j = 0; compat_hwcap_str[j]; j++) + if (compat_elf_hwcap & (1 << j)) + seq_printf(m, " %s", compat_hwcap_str[j]); +#endif /* CONFIG_COMPAT */ + } else { + for (j = 0; hwcap_str[j]; j++) + if (elf_hwcap & (1 << j)) + seq_printf(m, " %s", hwcap_str[j]); + } + seq_puts(m, "\n"); - seq_printf(m, "Hardware\t: %s\n", machine_name); + seq_printf(m, "CPU implementer\t: 0x%02x\n", (midr >> 24)); + seq_printf(m, "CPU architecture: 8\n"); + seq_printf(m, "CPU variant\t: 0x%x\n", ((midr >> 20) & 0xf)); + seq_printf(m, "CPU part\t: 0x%03x\n", ((midr >> 4) & 0xfff)); + seq_printf(m, "CPU revision\t: %d\n\n", (midr & 0xf)); + } return 0; } |