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arm64: Handle width of a cpuid feature 

Introduce a helper to extract cpuid feature for any given
width.

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>
This commit is contained in:
Suzuki K. Poulose 2015-10-19 14:24:44 +01:00 committed by Catalin Marinas
parent 12d11817ea
commit ce98a677d8
1 changed files with 9 additions and 3 deletions
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12
arch/arm64/include/asm/cpufeature.h
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@ -76,10 +76,16 @@ static inline void cpus_set_cap(unsigned int num)
__set_bit(num, cpu_hwcaps); __set_bit(num, cpu_hwcaps);
} }
static inline int __attribute_const__ cpuid_feature_extract_field(u64 features, static inline int __attribute_const__
int field) 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) static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0)