diff options
Diffstat (limited to 'sys/arch/amd64/include/atomic.h')
| -rw-r--r-- | sys/arch/amd64/include/atomic.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/arch/amd64/include/atomic.h b/sys/arch/amd64/include/atomic.h index db184d78122..1df5a74ef2c 100644 --- a/sys/arch/amd64/include/atomic.h +++ b/sys/arch/amd64/include/atomic.h @@ -1,4 +1,4 @@ -/* $OpenBSD: atomic.h,v 1.5 2007/02/19 17:18:42 deraadt Exp $ */ +/* $OpenBSD: atomic.h,v 1.6 2007/05/25 16:22:11 art Exp $ */ /* $NetBSD: atomic.h,v 1.1 2003/04/26 18:39:37 fvdl Exp $ */ /* @@ -90,6 +90,16 @@ x86_atomic_clearbits_u32(volatile u_int32_t *ptr, u_int32_t bits) __asm __volatile(LOCK " andl %1,%0" : "=m" (*ptr) : "ir" (~bits)); } +static __inline u_long +x86_atomic_cas_ul(volatile u_long *ptr, u_long expect, u_long set) +{ + u_long res; + + __asm volatile(LOCK " cmpxchgq %2, %1" : "=a" (res), "=m" (*ptr) + : "r" (set), "a" (expect), "m" (*ptr) : "memory"); + + return (res); +} /* * XXX XXX XXX |