Messages in this thread Patch in this message | | | From | Suzuki K Poulose <> | Subject | [PATCH v3 5/7] arm64: cpufeature: Track 32bit EL0 support | Date | Thu, 31 Mar 2016 18:27:33 +0100 |
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Add cpu_hwcap bit for keeping track of the support for 32bit EL0.
Tested-by: Yury Norov <ynorov@caviumnetworks.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- arch/arm64/include/asm/cpufeature.h | 8 +++++++- arch/arm64/kernel/cpufeature.c | 9 +++++++++ 2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 7f64285..ca8fb4b 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -35,8 +35,9 @@ #define ARM64_ALT_PAN_NOT_UAO 10 #define ARM64_HAS_VIRT_HOST_EXTN 11 #define ARM64_WORKAROUND_CAVIUM_27456 12 +#define ARM64_HAS_32BIT_EL0 13 -#define ARM64_NCAPS 13 +#define ARM64_NCAPS 14 #ifndef __ASSEMBLY__ @@ -192,6 +193,11 @@ static inline bool cpu_supports_mixed_endian_el0(void) return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1)); } +static inline bool system_supports_32bit_el0(void) +{ + return cpus_have_cap(ARM64_HAS_32BIT_EL0); +} + static inline bool system_supports_mixed_endian_el0(void) { return id_aa64mmfr0_mixed_endian_el0(read_system_reg(SYS_ID_AA64MMFR0_EL1)); diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index cfc0cfd..739314b 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -733,6 +733,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .capability = ARM64_HAS_VIRT_HOST_EXTN, .matches = runs_at_el2, }, + { + .desc = "32bit EL0 Support", + .capability = ARM64_HAS_32BIT_EL0, + .matches = has_cpuid_feature, + .sys_reg = SYS_ID_AA64PFR0_EL1, + .sign = FTR_UNSIGNED, + .field_pos = ID_AA64PFR0_EL0_SHIFT, + .min_field_value = ID_AA64PFR0_EL0_32BIT_64BIT, + }, {}, }; -- 1.7.9.5
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