Messages in this thread Patch in this message | | | From | "Suzuki K. Poulose" <> | Subject | [PATCH v3 08/24] arm64: Handle width of a cpuid feature | Date | Tue, 13 Oct 2015 18:22:16 +0100 |
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Introduce a helper to extract cpuid feature for any given width.
Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> --- arch/arm64/include/asm/cpufeature.h | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index b5f313d..85507fe 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -76,10 +76,16 @@ static inline void cpus_set_cap(unsigned int num) __set_bit(num, cpu_hwcaps); } -static inline int __attribute_const__ cpuid_feature_extract_field(u64 features, - int field) +static inline int __attribute_const__ +cpuid_feature_extract_field_width(u64 features, int field, int width) { - return (s64)(features << (64 - 4 - field)) >> (64 - 4); + return (s64)(features << (64 - width - field)) >> (64 - width); +} + +static inline int __attribute_const__ +cpuid_feature_extract_field(u64 features, int field) +{ + return cpuid_feature_extract_field_width(features, field, 4); } static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0) -- 1.7.9.5
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