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s390/hwcaps: Add documentation for HWCAP flags

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Describe that some HWCAP bits are reserved to avoid that they will be
used by accident.

Suggested-by: Stefan Liebler <stli@linux.ibm.com>
Reviewed-by: Stefan Liebler <stli@linux.ibm.com>
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2024-06-28 10:35:24 +02:00 committed by Alexander Gordeev
parent 02ee149198
commit 5f95843d51
1 changed files with 8 additions and 0 deletions
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8
arch/s390/include/asm/elf.h
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@ -91,6 +91,14 @@
/* Keep this the last entry. */
#define R_390_NUM 61
/*
* HWCAP flags - for AT_HWCAP
*
* Bits 32-63 are reserved for use by libc.
* Bit 31 is reserved and will be used by libc to determine if a second
* argument is passed to IFUNC resolvers. This will be implemented when
* there is a need for AT_HWCAP2.
*/
enum {
HWCAP_NR_ESAN3 = 0,
HWCAP_NR_ZARCH = 1,