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authorChris Metcalf <cmetcalf@tilera.com>2013-08-07 15:33:32 -0400
committerChris Metcalf <cmetcalf@tilera.com>2013-08-13 16:26:21 -0400
commit4a556f4f56da3110b27e265b79f0e7582115445c (patch)
treef5af0b865c867160855e4722b49d7e850dddf944 /arch/tile/include/uapi
parent0c1d1917c547c8e787fb58e20e2de577453c980c (diff)
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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')
-rw-r--r--arch/tile/include/uapi/asm/auxvec.h3
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 */