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Diffstat (limited to 'arch/arm64/kernel/setup.c')
-rw-r--r--arch/arm64/kernel/setup.c108
1 files changed, 83 insertions, 25 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 2437196cc5d4..b80991166754 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -43,12 +43,14 @@
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/efi.h>
+#include <linux/personality.h>
#include <asm/fixmap.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/elf.h>
#include <asm/cputable.h>
+#include <asm/cpufeature.h>
#include <asm/cpu_ops.h>
#include <asm/sections.h>
#include <asm/setup.h>
@@ -72,13 +74,15 @@ EXPORT_SYMBOL_GPL(elf_hwcap);
COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
- COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
+ COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\
+ COMPAT_HWCAP_LPAE)
unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
unsigned int compat_elf_hwcap2 __read_mostly;
#endif
+DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
+
static const char *cpu_name;
-static const char *machine_name;
phys_addr_t __fdt_pointer __initdata;
/*
@@ -116,12 +120,16 @@ void __init early_print(const char *str, ...)
void __init smp_setup_processor_id(void)
{
+ u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
+ cpu_logical_map(0) = mpidr;
+
/*
* 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%lx\n", (unsigned long)mpidr);
}
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
@@ -311,7 +319,7 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
cpu_relax();
}
- machine_name = of_flat_dt_get_machine_name();
+ dump_stack_set_arch_desc("%s (DT)", of_flat_dt_get_machine_name());
}
/*
@@ -376,6 +384,7 @@ void __init setup_arch(char **cmdline_p)
*cmdline_p = boot_command_line;
+ early_fixmap_init();
early_ioremap_init();
parse_early_param();
@@ -398,7 +407,6 @@ void __init setup_arch(char **cmdline_p)
psci_init();
- cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
cpu_read_bootcpu_ops();
#ifdef CONFIG_SMP
smp_init_cpus();
@@ -447,14 +455,50 @@ 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"
+};
+
+static const char *compat_hwcap2_str[] = {
+ "aes",
+ "pmull",
+ "sha1",
+ "sha2",
+ "crc32",
+ NULL
+};
+#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
@@ -463,24 +507,38 @@ 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");
-
- seq_printf(m, "Hardware\t: %s\n", machine_name);
+ /*
+ * 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]);
+
+ for (j = 0; compat_hwcap2_str[j]; j++)
+ if (compat_elf_hwcap2 & (1 << j))
+ seq_printf(m, " %s", compat_hwcap2_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, "CPU implementer\t: 0x%02x\n",
+ MIDR_IMPLEMENTOR(midr));
+ seq_printf(m, "CPU architecture: 8\n");
+ seq_printf(m, "CPU variant\t: 0x%x\n", MIDR_VARIANT(midr));
+ seq_printf(m, "CPU part\t: 0x%03x\n", MIDR_PARTNUM(midr));
+ seq_printf(m, "CPU revision\t: %d\n\n", MIDR_REVISION(midr));
+ }
return 0;
}