$NetBSD: patch-ac,v 1.1 2008/08/17 22:40:26 dholland Exp $

--- fastlock.h.orig	2008-08-17 18:36:52.000000000 -0400
+++ fastlock.h	2008-08-17 18:36:55.000000000 -0400
@@ -77,6 +77,11 @@ inline static int tsl(fl_lock_t* lock)
 		" xchg %b1, %0" : "=q" (val), "=m" (*lock) : "0" (val) : "memory"
 	);
 #endif /*NOSMP*/
+#elif defined __CPU_amd64
+	val=1;
+	asm volatile( 
+		" xchg %b1, %0" : "=q" (val), "=m" (*lock) : "0" (val) : "memory"
+	);
 #elif defined __CPU_sparc64
 	asm volatile(
 			"ldstub [%1], %0 \n\t"
@@ -142,6 +147,13 @@ inline static void release_lock(fl_lock_
 		" movb $0, (%0)" : /*no output*/ : "r"(lock): "memory"
 		/*" xchg %b0, %1" : "=q" (val), "=m" (*lock) : "0" (val) : "memory"*/
 	); 
+#elif defined __CPU_amd64
+	char val;
+	val=0;
+	asm volatile(
+		" movb $0, (%0)" : /*no output*/ : "r"(lock): "memory"
+		/*" xchg %b0, %1" : "=q" (val), "=m" (*lock) : "0" (val) : "memory"*/
+	); 
 #elif defined __CPU_sparc64
 	asm volatile(
 #ifndef NOSMP