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| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-07 23:33:32 +0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-14 00:26:21 +0400 |
| commit | 4a556f4f56da3110b27e265b79f0e7582115445c (patch) | |
| tree | f5af0b865c867160855e4722b49d7e850dddf944 /arch/tile/include/uapi/asm | |
| parent | 0c1d1917c547c8e787fb58e20e2de577453c980c (diff) | |
| download | linux-4a556f4f56da3110b27e265b79f0e7582115445c.tar.xz | |
tile: implement gettimeofday() via vDSO
This change creates the framework for vDSO calls, makes the existing
rt_sigreturn() mechanism use it, and adds a fast gettimeofday().
Now that we need to expose the vDSO address to userspace, we add
AT_SYSINFO_EHDR to the set of aux entries provided to userspace.
(You can disable any extra vDSO support by booting with vdso=0,
but the rt_sigreturn vDSO page will still be provided.)
Note that glibc has supported the tile vDSO since release 2.17.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/include/uapi/asm')
| -rw-r--r-- | arch/tile/include/uapi/asm/auxvec.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/tile/include/uapi/asm/auxvec.h b/arch/tile/include/uapi/asm/auxvec.h index 1d393edb0641..c93e92709f14 100644 --- a/arch/tile/include/uapi/asm/auxvec.h +++ b/arch/tile/include/uapi/asm/auxvec.h @@ -15,6 +15,7 @@ #ifndef _ASM_TILE_AUXVEC_H #define _ASM_TILE_AUXVEC_H -/* No extensions to auxvec */ +/* The vDSO location. */ +#define AT_SYSINFO_EHDR 33 #endif /* _ASM_TILE_AUXVEC_H */ |