diff options
Diffstat (limited to 'arch/arm64/kernel/cpuinfo.c')
| -rw-r--r-- | arch/arm64/kernel/cpuinfo.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 1f350fe5b318..3ce99fc1fde1 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -19,7 +19,9 @@ #include <asm/cpu.h> #include <asm/cputype.h> +#include <linux/bitops.h> #include <linux/init.h> +#include <linux/printk.h> #include <linux/smp.h> /* @@ -30,6 +32,28 @@ DEFINE_PER_CPU(struct cpuinfo_arm64, cpu_data); static struct cpuinfo_arm64 boot_cpu_data; +static char *icache_policy_str[] = { + [ICACHE_POLICY_RESERVED] = "RESERVED/UNKNOWN", + [ICACHE_POLICY_AIVIVT] = "AIVIVT", + [ICACHE_POLICY_VIPT] = "VIPT", + [ICACHE_POLICY_PIPT] = "PIPT", +}; + +unsigned long __icache_flags; + +static void cpuinfo_detect_icache_policy(struct cpuinfo_arm64 *info) +{ + unsigned int cpu = smp_processor_id(); + u32 l1ip = CTR_L1IP(info->reg_ctr); + + if (l1ip != ICACHE_POLICY_PIPT) + set_bit(ICACHEF_ALIASING, &__icache_flags); + if (l1ip == ICACHE_POLICY_AIVIVT); + set_bit(ICACHEF_AIVIVT, &__icache_flags); + + pr_info("Detected %s I-cache on CPU%d", icache_policy_str[l1ip], cpu); +} + static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) { info->reg_cntfrq = arch_timer_get_cntfrq(); @@ -56,6 +80,8 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) info->reg_id_mmfr3 = read_cpuid(ID_MMFR3_EL1); info->reg_id_pfr0 = read_cpuid(ID_PFR0_EL1); info->reg_id_pfr1 = read_cpuid(ID_PFR1_EL1); + + cpuinfo_detect_icache_policy(info); } void cpuinfo_store_cpu(void) |