Commit d3e4a9d3 authored by Mark Brown's avatar Mark Brown Committed by Will Deacon
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arm64/hwcap: Document allocation of upper bits of AT_HWCAP 



The top two bits of AT_HWCAP are reserved for use by glibc and the rest of
the top 32 bits are being kept unallocated for potential use by glibc.
Document this in the header.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarSzabolcs Nagy <szabolcs.nagy@arm.com>
Link: https://lore.kernel.org/r/20220707103632.12745-2-broonie@kernel.org


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 3a46b352

arch/arm64/include/uapi/asm/hwcap.h

+3 −0
Original line number Diff line number Diff line
@@ -19,6 +19,9 @@ 


/*

 * HWCAP flags - for AT_HWCAP

 *

 * Bits 62 and 63 are reserved for use by libc.

 * Bits 32-61 are unallocated for potential use by libc.

 */

#define HWCAP_FP		(1 << 0)

#define HWCAP_ASIMD		(1 << 1)