boot-132.tar.gz

[apple/boot.git] / i386 / libsa / string.c

diff --git a/i386/libsa/string.c b/i386/libsa/string.c
index 4ed67cd4ca7fc23f64dbc450244678a3e37d6c70..a65a6e4397d6cf84bae1971768e704badf75ad19 100644 (file)
--- a/i386/libsa/string.c
+++ b/i386/libsa/string.c
@@ -1,12 +1,12 @@
 /*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
+ * Portions Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights
  * Reserved.  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 1.1 (the "License").  You may not use this file
+ * 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.apple.com/publicsource and read it before using
  * this file.
@@ -27,7 +27,7 @@
 
 void * memset(void * dst, int val, size_t len)
 {
-    asm( "rep; stosb"
+    asm volatile ( "rep; stosb"
        : "=c" (len), "=D" (dst)
        : "0" (len), "1" (dst), "a" (val)
        : "memory" );
@@ -35,9 +35,10 @@ void * memset(void * dst, int val, size_t len)
     return dst;
 }
 
+#if 0
 void * memcpy(void * dst, const void * src, size_t len)
 {
-    asm( "rep; movsb"
+    asm volatile ( "rep; movsb"
        : "=c" (len), "=D" (dst), "=S" (src)
        : "0" (len), "1" (dst), "2" (src)
        : "memory" );
@@ -55,6 +56,53 @@ void bzero(void * dst, size_t len)
     memset(dst, 0, len);
 }
 
+#else
+void * memcpy(void * dst, const void * src, size_t len)
+{
+    asm volatile ( "cld                  \n\t"
+         "movl %%ecx, %%edx    \n\t"
+         "shrl $2, %%ecx       \n\t"
+         "rep; movsl           \n\t"
+         "movl %%edx, %%ecx    \n\t"
+         "andl $3, %%ecx       \n\t"
+         "rep; movsb           \n\t"
+       : "=D" (dst)
+       : "c" (len), "D" (dst), "S" (src)
+       : "memory", "%edx" );
+
+    return dst;
+}
+
+void bcopy(const void * src, void * dst, size_t len)
+{
+    asm volatile ( "cld                  \n\t"
+         "movl %%ecx, %%edx    \n\t"
+         "shrl $2, %%ecx       \n\t"
+         "rep; movsl           \n\t"
+         "movl %%edx, %%ecx    \n\t"
+         "andl $3, %%ecx       \n\t"
+         "rep; movsb           \n\t"
+       :
+       : "c" (len), "D" (dst), "S" (src)
+       : "memory", "%edx" );
+}
+
+void bzero(void * dst, size_t len)
+{
+    asm volatile ( "xorl %%eax, %%eax    \n\t"
+         "cld                  \n\t"
+         "movl %%ecx, %%edx    \n\t"
+         "shrl $2, %%ecx       \n\t"
+         "rep; stosl           \n\t"
+         "movl %%edx, %%ecx    \n\t"
+         "andl $3, %%ecx       \n\t"
+         "rep; stosb           \n\t"
+       : 
+       : "c" (len), "D" (dst)
+       : "memory", "%eax" );
+}
+#endif
+
 /* #if DONT_USE_GCC_BUILT_IN_STRLEN */
 
 #define tolower(c)     ((int)((c) & ~0x20))