diff options
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 42 |
1 files changed, 37 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index c008bae718eb..d71140b76773 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -24,12 +24,32 @@ #define ARM64_WORKAROUND_CLEAN_CACHE 0 #define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1 #define ARM64_WORKAROUND_845719 2 +#define ARM64_HAS_SYSREG_GIC_CPUIF 3 +#define ARM64_HAS_PAN 4 -#define NCAPS 3 +#define ARM64_NCAPS 5 #ifndef __ASSEMBLY__ -extern DECLARE_BITMAP(cpu_hwcaps, NCAPS); +struct arm64_cpu_capabilities { + const char *desc; + u16 capability; + bool (*matches)(const struct arm64_cpu_capabilities *); + void (*enable)(void); + union { + struct { /* To be used for erratum handling only */ + u32 midr_model; + u32 midr_range_min, midr_range_max; + }; + + struct { /* Feature register checking */ + int field_pos; + int min_field_value; + }; + }; +}; + +extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); static inline bool cpu_have_feature(unsigned int num) { @@ -38,21 +58,33 @@ static inline bool cpu_have_feature(unsigned int num) static inline bool cpus_have_cap(unsigned int num) { - if (num >= NCAPS) + if (num >= ARM64_NCAPS) return false; return test_bit(num, cpu_hwcaps); } static inline void cpus_set_cap(unsigned int num) { - if (num >= NCAPS) + if (num >= ARM64_NCAPS) pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n", - num, NCAPS); + num, ARM64_NCAPS); else __set_bit(num, cpu_hwcaps); } +static inline int __attribute_const__ cpuid_feature_extract_field(u64 features, + int field) +{ + return (s64)(features << (64 - 4 - field)) >> (64 - 4); +} + + +void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps, + const char *info); void check_local_cpu_errata(void); +void check_local_cpu_features(void); +bool cpu_supports_mixed_endian_el0(void); +bool system_supports_mixed_endian_el0(void); #endif /* __ASSEMBLY__ */ |