From: Suzuki K Poulose Date: Mon, 18 Apr 2016 09:28:34 +0000 (+0100) Subject: arm64: Add helpers for detecting AArch32 support at EL0 X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=c80aba803a9aa131f997f62a71ab453e456d08a8;p=openwrt%2Fstaging%2Fblogic.git arm64: Add helpers for detecting AArch32 support at EL0 Adds a helper to extract the support for AArch32 at EL0 Tested-by: Yury Norov Signed-off-by: Suzuki K Poulose Signed-off-by: Will Deacon --- diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index b9b649422fca..7f64285e4ef7 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -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, diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 19182ef18f8f..d39d4343318a 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -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