Author: rnoland
Date: Fri Oct 30 16:59:58 2009
New Revision: 198692
URL: http://svn.freebsd.org/changeset/base/198692
Log:
Use system specified memory barriers rather than rolling our own.
Modified:
head/sys/dev/drm/drmP.h
Modified: head/sys/dev/drm/drmP.h
==============================================================================
--- head/sys/dev/drm/drmP.h Fri Oct 30 16:55:31 2009 (r198691)
+++ head/sys/dev/drm/drmP.h Fri Oct 30 16:59:58 2009 (r198692)
@@ -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) + \
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