diff options
| author | Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-11-18 17:08:57 (GMT) |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-11-26 18:07:59 (GMT) |
| commit | 4f0a606bce5ecd3a8210e896c33f41d1bf7f752f (patch) | |
| tree | 030f49a7be4723c84a0551500455d05b109e8ecd /arch/arm64/include | |
| parent | d21182718400f51f0729ae8268d94bd820ec8b71 (diff) | |
| download | linux-4f0a606bce5ecd3a8210e896c33f41d1bf7f752f.tar.xz | |
arm64: cpufeature: Track unsigned fields
Some of the feature bits have unsigned values and need
to be treated accordingly to avoid errors. Adds the property
to the feature bits and use the appropriate field extract helpers.
Reported-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 7a16102..29c3f5d 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -46,8 +46,12 @@ enum ftr_type { #define FTR_STRICT true /* SANITY check strict matching required */ #define FTR_NONSTRICT false /* SANITY check ignored */ +#define FTR_SIGNED true /* Value should be treated as signed */ +#define FTR_UNSIGNED false /* Value should be treated as unsigned */ + struct arm64_ftr_bits { - bool strict; /* CPU Sanity check: strict matching required ? */ + bool sign; /* Value is signed ? */ + bool strict; /* CPU Sanity check: strict matching required ? */ enum ftr_type type; u8 shift; u8 width; @@ -142,7 +146,9 @@ static inline u64 arm64_ftr_mask(struct arm64_ftr_bits *ftrp) static inline s64 arm64_ftr_value(struct arm64_ftr_bits *ftrp, u64 val) { - return cpuid_feature_extract_field_width(val, ftrp->shift, ftrp->width); + return ftrp->sign ? + cpuid_feature_extract_field_width(val, ftrp->shift, ftrp->width) : + cpuid_feature_extract_unsigned_field_width(val, ftrp->shift, ftrp->width); } static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0) |