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    Subject[PATCH 5/6] arm64: cpufeature: Track 32bit EL0 support
    Date
    Keep track of the support for 32bit EL0.

    Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
    ---
    arch/arm64/include/asm/cpufeature.h | 8 +++++++-
    arch/arm64/kernel/cpufeature.c | 11 +++++++++++
    2 files changed, 18 insertions(+), 1 deletion(-)

    diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
    index 98f83d7..46c6f4c 100644
    --- a/arch/arm64/include/asm/cpufeature.h
    +++ b/arch/arm64/include/asm/cpufeature.h
    @@ -30,8 +30,9 @@
    #define ARM64_HAS_LSE_ATOMICS 5
    #define ARM64_WORKAROUND_CAVIUM_23154 6
    #define ARM64_WORKAROUND_834220 7
    +#define ARM64_HAS_32BIT_EL0 8

    -#define ARM64_NCAPS 8
    +#define ARM64_NCAPS 9

    #ifndef __ASSEMBLY__

    @@ -187,6 +188,11 @@ 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 853e575..8deaa20 100644
    --- a/arch/arm64/kernel/cpufeature.c
    +++ b/arch/arm64/kernel/cpufeature.c
    @@ -675,6 +675,17 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
    .min_field_value = 2,
    },
    #endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
    +#ifdef CONFIG_COMPAT
    + {
    + .desc = "32 bit EL0",
    + .capability = ARM64_HAS_32BIT_EL0,
    + .matches = has_cpuid_feature,
    + .sys_reg = SYS_ID_AA64PFR0_EL1,
    + .field_pos = ID_AA64PFR0_EL0_SHIFT,
    + .sign = FTR_UNSIGNED,
    + .min_field_value = ID_AA64PFR0_EL0_32BIT_64BIT,
    + },
    +#endif
    {},
    };

    --
    1.7.9.5
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