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arm64/hwcap: Document allocation of upper bits of AT_HWCAP

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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: Mark Brown <broonie@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Link: https://lore.kernel.org/r/20220707103632.12745-2-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2022-07-07 11:36:30 +01:00 committed by Will Deacon
parent 3a46b352a3
commit d3e4a9d308
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/include/uapi/asm/hwcap.h
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@ -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)