diff options
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index af50064dea51..6e715c6d4994 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -52,6 +52,7 @@ unsigned int compat_elf_hwcap2 __read_mostly; DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); EXPORT_SYMBOL(cpu_hwcaps); +static struct arm64_cpu_capabilities const __ro_after_init *cpu_hwcaps_ptrs[ARM64_NCAPS]; /* * Flag to indicate if we have computed the system wide @@ -518,6 +519,29 @@ static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new) } extern const struct arm64_cpu_capabilities arm64_errata[]; +static const struct arm64_cpu_capabilities arm64_features[]; + +static void __init +init_cpu_hwcaps_indirect_list_from_array(const struct arm64_cpu_capabilities *caps) +{ + for (; caps->matches; caps++) { + if (WARN(caps->capability >= ARM64_NCAPS, + "Invalid capability %d\n", caps->capability)) + continue; + if (WARN(cpu_hwcaps_ptrs[caps->capability], + "Duplicate entry for capability %d\n", + caps->capability)) + continue; + cpu_hwcaps_ptrs[caps->capability] = caps; + } +} + +static void __init init_cpu_hwcaps_indirect_list(void) +{ + init_cpu_hwcaps_indirect_list_from_array(arm64_features); + init_cpu_hwcaps_indirect_list_from_array(arm64_errata); +} + static void __init setup_boot_cpu_capabilities(void); void __init init_cpu_features(struct cpuinfo_arm64 *info) @@ -564,6 +588,12 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info) } /* + * Initialize the indirect array of CPU hwcaps capabilities pointers + * before we handle the boot CPU below. + */ + init_cpu_hwcaps_indirect_list(); + + /* * Detect and enable early CPU capabilities based on the boot CPU, * after we have initialised the CPU feature infrastructure. */ @@ -1750,8 +1780,6 @@ static void __init mark_const_caps_ready(void) static_branch_enable(&arm64_const_caps_ready); } -extern const struct arm64_cpu_capabilities arm64_errata[]; - bool this_cpu_has_cap(unsigned int cap) { return (__this_cpu_has_cap(arm64_features, cap) || |