1 files changed, 87 insertions, 0 deletions
diff --git a/arch/x86/boot/copy.S b/arch/x86/boot/copy.S
new file mode 100644
index 00000000..11f272c6
--- /dev/null
+++ b/arch/x86/boot/copy.S
@@ -0,0 +1,87 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+#include <linux/linkage.h>
+
+/*
+ * Memory copy routines
+ */
+
+	.code16gcc
+	.text
+
+GLOBAL(memcpy)
+	pushw	%si
+	pushw	%di
+	movw	%ax, %di
+	movw	%dx, %si
+	pushw	%cx
+	shrw	$2, %cx
+	rep; movsl
+	popw	%cx
+	andw	$3, %cx
+	rep; movsb
+	popw	%di
+	popw	%si
+	ret
+ENDPROC(memcpy)
+
+GLOBAL(memset)
+	pushw	%di
+	movw	%ax, %di
+	movzbl	%dl, %eax
+	imull	$0x01010101,%eax
+	pushw	%cx
+	shrw	$2, %cx
+	rep; stosl
+	popw	%cx
+	andw	$3, %cx
+	rep; stosb
+	popw	%di
+	ret
+ENDPROC(memset)
+
+GLOBAL(copy_from_fs)
+	pushw	%ds
+	pushw	%fs
+	popw	%ds
+	call	memcpy
+	popw	%ds
+	ret
+ENDPROC(copy_from_fs)
+
+GLOBAL(copy_to_fs)
+	pushw	%es
+	pushw	%fs
+	popw	%es
+	call	memcpy
+	popw	%es
+	ret
+ENDPROC(copy_to_fs)
+
+#if 0 /* Not currently used, but can be enabled as needed */
+GLOBAL(copy_from_gs)
+	pushw	%ds
+	pushw	%gs
+	popw	%ds
+	call	memcpy
+	popw	%ds
+	ret
+ENDPROC(copy_from_gs)
+
+GLOBAL(copy_to_gs)
+	pushw	%es
+	pushw	%gs
+	popw	%es
+	call	memcpy
+	popw	%es
+	ret
+ENDPROC(copy_to_gs)
+#endif