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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2017-01-09 17:28:32 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-01-12 12:31:31 +0000 |
| commit | 4aa8a472c33f4024381ade56bef008a9c566366a (patch) | |
| tree | 43c692da58bb5b4f1a9bfee127f7969b6e068008 /arch/arm64/kernel | |
| parent | 77c97b4ee21290f5f083173d957843b615abbff2 (diff) | |
| download | linux-4aa8a472c33f4024381ade56bef008a9c566366a.tar.gz linux-4aa8a472c33f4024381ade56bef008a9c566366a.tar.xz | |
arm64: Documentation - Expose CPU feature registers
Documentation for the infrastructure to expose CPU feature
register by emulating MRS.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Dave Martin <dave.martin@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 8abe6ea90793..d249f4391078 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -82,6 +82,10 @@ static bool __maybe_unused cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused); +/* + * NOTE: Any changes to the visibility of features should be kept in + * sync with the documentation of the CPU feature register ABI. + */ static const struct arm64_ftr_bits ftr_id_aa64isar0[] = { ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64ISAR0_RDM_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_ATOMICS_SHIFT, 4, 0), |