diff options
author | Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-10-19 14:24:42 +0100 |
---|---|---|
committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-10-21 15:33:51 +0100 |
commit | cdcf817b7e4b62b935d8797f7d07ea0b97760884 (patch) | |
tree | 8e3ed4836f814c10fb8d8786d03f275424b8307d /arch/arm64/kernel/cpufeature.c | |
parent | 9cdf8ec4a86b9310111f741bbaf11df9120e0482 (diff) |
arm64: Move mixed endian support detection
Move the mixed endian support detection code to cpufeature.c
from cpuinfo.c. This also moves the update_cpu_features()
used by mixed endian detection code, which will get more
functionality.
Also moves the ID register field shifts to asm/sysreg.h,
where all the useful definitions will end up in later patches.
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/cpufeature.c')
-rw-r--r-- | arch/arm64/kernel/cpufeature.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index e49be15c7ff9..1ae8b24f334a 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -22,7 +22,9 @@ #include <asm/cpu.h> #include <asm/cpufeature.h> #include <asm/processor.h> +#include <asm/sysreg.h> +static bool mixed_endian_el0 = true; unsigned long elf_hwcap __read_mostly; EXPORT_SYMBOL_GPL(elf_hwcap); @@ -41,6 +43,26 @@ unsigned int compat_elf_hwcap2 __read_mostly; DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); +bool cpu_supports_mixed_endian_el0(void) +{ + return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1)); +} + +bool system_supports_mixed_endian_el0(void) +{ + return mixed_endian_el0; +} + +static void update_mixed_endian_el0_support(struct cpuinfo_arm64 *info) +{ + mixed_endian_el0 &= id_aa64mmfr0_mixed_endian_el0(info->reg_id_aa64mmfr0); +} + +void update_cpu_features(struct cpuinfo_arm64 *info) +{ + update_mixed_endian_el0_support(info); +} + static bool feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) { |