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arm64: Add helpers for detecting AArch32 support at EL0 

Adds a helper to extract the support for AArch32 at EL0

Tested-by: Yury Norov <ynorov@caviumnetworks.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Suzuki K Poulose 2016-04-18 10:28:34 +01:00 committed by Will Deacon
parent 752835019c
commit c80aba803a
2 changed files with 8 additions and 0 deletions
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7
arch/arm64/include/asm/cpufeature.h
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@ -170,6 +170,13 @@ static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0)
cpuid_feature_extract_unsigned_field(mmfr0, ID_AA64MMFR0_BIGENDEL0_SHIFT) == 0x1;
}
static inline bool id_aa64pfr0_32bit_el0(u64 pfr0)
{
u32 val = cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_EL0_SHIFT);
return val == ID_AA64PFR0_EL0_32BIT_64BIT;
}
void __init setup_cpu_features(void);
void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,

1
arch/arm64/include/asm/sysreg.h
View File

@ -115,6 +115,7 @@
#define ID_AA64PFR0_ASIMD_SUPPORTED 0x0
#define ID_AA64PFR0_EL1_64BIT_ONLY 0x1
#define ID_AA64PFR0_EL0_64BIT_ONLY 0x1
#define ID_AA64PFR0_EL0_32BIT_64BIT 0x2
/* id_aa64mmfr0 */
#define ID_AA64MMFR0_TGRAN4_SHIFT 28