File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/x86/boot/copy.S b/arch/x86/boot/copy.S
new file mode 100644
index 0000000..1eb7d29
--- /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
+ */
+
+ .code16
+ .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
+ retl
+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
+ retl
+ENDPROC(memset)
+
+GLOBAL(copy_from_fs)
+ pushw %ds
+ pushw %fs
+ popw %ds
+ calll memcpy
+ popw %ds
+ retl
+ENDPROC(copy_from_fs)
+
+GLOBAL(copy_to_fs)
+ pushw %es
+ pushw %fs
+ popw %es
+ calll memcpy
+ popw %es
+ retl
+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
+ calll memcpy
+ popw %ds
+ retl
+ENDPROC(copy_from_gs)
+
+GLOBAL(copy_to_gs)
+ pushw %es
+ pushw %gs
+ popw %es
+ calll memcpy
+ popw %es
+ retl
+ENDPROC(copy_to_gs)
+#endif