diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2024-06-28 10:35:24 +0200 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2024-07-02 10:17:16 +0200 |
| commit | 5f95843d51e7e0eb0d6ccea074f906214ef06fbc (patch) | |
| tree | c102a22bc12d34d61bb383f7770af41d9457e18d | |
| parent | 02ee149198b4e4ad1a5b9e4c7806f924609b5fb3 (diff) | |
s390/hwcaps: Add documentation for HWCAP flags
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>
| -rw-r--r-- | arch/s390/include/asm/elf.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h index 70a30ae258b7..8f2c23cc52b6 100644 --- a/arch/s390/include/asm/elf.h +++ b/arch/s390/include/asm/elf.h @@ -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, |