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: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NSuzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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