The prefix for CLFLUSHOPT is 0x66. It was right on amd64.

Sponsored by:	The FreeBSD Foundation

diff --git a/sys/i386/include/cpufunc.h b/sys/i386/include/cpufunc.h
index ca7207d856632f7eb2110f1d5014d62711ff4e1c..f43319476d3fdf90d2b12700a4eef43fb73a3696 100644 (file)
--- a/sys/i386/include/cpufunc.h
+++ b/sys/i386/include/cpufunc.h
@@ -89,7 +89,7 @@ static __inline void
 clflushopt(u_long addr)
 {
 
-       __asm __volatile(".byte 66;clflush %0" : : "m" (*(char *)addr));
+       __asm __volatile(".byte 0x66;clflush %0" : : "m" (*(char *)addr));
 }
 
 static __inline void