Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / x86 / boot / copy.S

diff --git a/kernel/arch/x86/boot/copy.S b/kernel/arch/x86/boot/copy.S
new file mode 100644 (file)
index 0000000..1eb7d29
--- /dev/null
+++ b/kernel/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