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--- src/mesa/drivers/dri/sis/sis_context.h.orig Tue Apr 11 13:41:11 2006
+++ src/mesa/drivers/dri/sis/sis_context.h Wed Dec 20 18:32:46 2006
@@ -401,8 +401,20 @@
#define MMIO_READ(reg) *(volatile GLint *)(smesa->IOBase + (reg))
#define MMIO_READf(reg) *(volatile GLfloat *)(smesa->IOBase + (reg))
-#if defined(__i386__) || defined(__amd64__)
+#if defined(__alpha__)
+#define MMIO_WMB() __asm __volatile("wmb" : : : "memory")
+#elif defined(__amd64__) || defined(__i386__)
#define MMIO_WMB() __asm __volatile("" : : : "memory")
+#elif defined(__ia64__)
+#define MMIO_WMB() __asm __volatile("mf" : : : "memory")
+#elif defined(__powerpc__)
+#define MMIO_WMB() __asm __volatile("eieio" : : : "memory")
+#elif defined(__sparc64__)
+/*
+ * #StoreStore probably would be sufficient for this driver at the
+ * time of this writing but we use #Sync for safety.
+ */
+#define MMIO_WMB() __asm __volatile("membar #Sync" : : : "memory")
#else
#error platform needs WMB
#endif
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