Messages in this thread Patch in this message | | | From | Suzuki K Poulose <> | Subject | [PATCH v2 3/8] arm64: Add helpers for detecting AArch32 support at EL0 | Date | Thu, 25 Feb 2016 09:52:43 +0000 |
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Adds a helper to extract the support for AArch32 at EL0
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- arch/arm64/include/asm/cpufeature.h | 7 +++++++ arch/arm64/include/asm/sysreg.h | 1 + 2 files changed, 8 insertions(+)
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 5444a77..98f83d7 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -165,6 +165,13 @@ 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, diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 4aeebec..76d2f3e 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -111,6 +111,7 @@ #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 -- 1.7.9.5
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