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| author | Joey Gouly <joey.gouly@arm.com> | 2021-12-10 16:54:32 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-12-13 18:53:00 +0000 |
| commit | 1175011a7d0030d49dc9c10bde36f08f26d0a8ee (patch) | |
| tree | d4ec5130ec2454c6e8137c1cb2bab1a04f26d01c /arch/arm64/include/asm/hwcap.h | |
| parent | 9e45365f1469ef2b934f9d035975dbc9ad352116 (diff) | |
| download | lwn-1175011a7d0030d49dc9c10bde36f08f26d0a8ee.tar.gz lwn-1175011a7d0030d49dc9c10bde36f08f26d0a8ee.zip | |
arm64: cpufeature: add HWCAP for FEAT_RPRES
Add a new HWCAP to detect the Increased precision of Reciprocal Estimate
and Reciprocal Square Root Estimate feature (FEAT_RPRES), introduced in Armv8.7.
Also expose this to userspace in the ID_AA64ISAR2_EL1 feature register.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211210165432.8106-4-joey.gouly@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/hwcap.h')
| -rw-r--r-- | arch/arm64/include/asm/hwcap.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index 2809df2fdd63..f68fbb207473 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -107,6 +107,7 @@ #define KERNEL_HWCAP_MTE __khwcap2_feature(MTE) #define KERNEL_HWCAP_ECV __khwcap2_feature(ECV) #define KERNEL_HWCAP_AFP __khwcap2_feature(AFP) +#define KERNEL_HWCAP_RPRES __khwcap2_feature(RPRES) /* * This yields a mask that user programs can use to figure out what |