svn commit: r198794 - in stable/8/sys: . amd64/include/xen cddl/contrib/opensolaris contrib/dev/acpica contrib/pf dev/drm dev/xen/xenpci

[Robert Noland]

Author: rnoland
Date: Mon Nov  2 15:57:03 2009
New Revision: 198794
URL: http://svn.freebsd.org/changeset/base/198794

Log:
  MFC 198692
  
  Use system specified memory barriers rather than rolling our own.

Modified:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/drm/drmP.h
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/dev/drm/drmP.h
==============================================================================
--- stable/8/sys/dev/drm/drmP.h	Mon Nov  2 15:54:41 2009	(r198793)
+++ stable/8/sys/dev/drm/drmP.h	Mon Nov  2 15:57:03 2009	(r198794)
@@ -223,23 +223,9 @@ typedef u_int8_t u8;
  * DRM_WRITEMEMORYBARRIER() prevents reordering of writes.
  * DRM_MEMORYBARRIER() prevents reordering of reads and writes.
  */
-#if defined(__i386__)
-#define DRM_READMEMORYBARRIER()		__asm __volatile( \
-					"lock; addl $0,0(%%esp)" : : : "memory");
-#define DRM_WRITEMEMORYBARRIER()	__asm __volatile("" : : : "memory");
-#define DRM_MEMORYBARRIER()		__asm __volatile( \
-					"lock; addl $0,0(%%esp)" : : : "memory");
-#elif defined(__alpha__)
-#define DRM_READMEMORYBARRIER()		alpha_mb();
-#define DRM_WRITEMEMORYBARRIER()	alpha_wmb();
-#define DRM_MEMORYBARRIER()		alpha_mb();
-#elif defined(__amd64__)
-#define DRM_READMEMORYBARRIER()		__asm __volatile( \
-					"lock; addl $0,0(%%rsp)" : : : "memory");
-#define DRM_WRITEMEMORYBARRIER()	__asm __volatile("" : : : "memory");
-#define DRM_MEMORYBARRIER()		__asm __volatile( \
-					"lock; addl $0,0(%%rsp)" : : : "memory");
-#endif
+#define DRM_READMEMORYBARRIER()		rmb()
+#define DRM_WRITEMEMORYBARRIER()	wmb()
+#define DRM_MEMORYBARRIER()		mb()
 
 #define DRM_READ8(map, offset)						\
 	*(volatile u_int8_t *)(((vm_offset_t)(map)->handle) +		\