diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/i386/include/atomic.h | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/sys/i386/include/atomic.h b/sys/i386/include/atomic.h index f6bcf0c..e800d0e 100644 --- a/sys/i386/include/atomic.h +++ b/sys/i386/include/atomic.h @@ -32,20 +32,9 @@ #error this file needs sys/cdefs.h as a prerequisite #endif - -#if defined(I686_CPU) -#define mb() __asm__ __volatile__ ("mfence;": : :"memory") -#define wmb() __asm__ __volatile__ ("sfence;": : :"memory") -#define rmb() __asm__ __volatile__ ("lfence;": : :"memory") -#else -/* - * do we need a serializing instruction? - */ -#define mb() -#define wmb() -#define rmb() -#endif - +#define mb() __asm __volatile("lock;addl $0,(%esp)") +#define wmb() __asm __volatile("lock;addl $0,(%esp)") +#define rmb() __asm __volatile("lock;addl $0,(%esp)") /* * Various simple operations on memory, each of which is atomic in the |
