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| author | Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-10-19 14:24:42 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-10-21 15:33:51 +0100 |
| commit | cdcf817b7e4b62b935d8797f7d07ea0b97760884 (patch) | |
| tree | 8e3ed4836f814c10fb8d8786d03f275424b8307d /arch/arm64/include/asm/cpufeature.h | |
| parent | 9cdf8ec4a86b9310111f741bbaf11df9120e0482 (diff) | |
| download | lwn-cdcf817b7e4b62b935d8797f7d07ea0b97760884.tar.gz lwn-cdcf817b7e4b62b935d8797f7d07ea0b97760884.zip | |
arm64: Move mixed endian support detection
Move the mixed endian support detection code to cpufeature.c
from cpuinfo.c. This also moves the update_cpu_features()
used by mixed endian detection code, which will get more
functionality.
Also moves the ID register field shifts to asm/sysreg.h,
where all the useful definitions will end up in later patches.
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index b7769f698a75..b5f313d42d79 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -10,6 +10,7 @@ #define __ASM_CPUFEATURE_H #include <asm/hwcap.h> +#include <asm/sysreg.h> /* * In the arm64 world (as in the ARM world), elf_hwcap is used both internally @@ -81,6 +82,12 @@ static inline int __attribute_const__ cpuid_feature_extract_field(u64 features, return (s64)(features << (64 - 4 - field)) >> (64 - 4); } +static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0) +{ + return cpuid_feature_extract_field(mmfr0, ID_AA64MMFR0_BIGENDEL_SHIFT) == 0x1 || + cpuid_feature_extract_field(mmfr0, ID_AA64MMFR0_BIGENDEL0_SHIFT) == 0x1; +} + void __init setup_cpu_features(void); void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps, |