--- /dev/null
+++ Libc/Libc-391/gen/cache.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/* cache control */
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <errno.h>
+#include <sys/types.h>
+
+static const unsigned int kCacheOptionsSyncForExecution = 0x1;
+extern void sys_icache_invalidate(void *, size_t);
+
+int
+sys_cache_control(unsigned int options, caddr_t start, size_t len)
+{
+     if (options == kCacheOptionsSyncForExecution) {
+	  sys_icache_invalidate(start, len);
+	  return 0;
+     }
+     return ENOTSUP;
+}