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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 13:16:45 +0400
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 13:16:45 +0400
commit96ae6ea0be1b902c28b3b463c27da42b41e2b63a (patch)
treefbc18761d4fa93d7b0f6dbf3496289fa32bd363a /arch/x86/boot/copy.S
parent0530bf37cebcf22a73652937c2340bc1ebd92000 (diff)
downloadlinux-96ae6ea0be1b902c28b3b463c27da42b41e2b63a.tar.xz
i386: move boot
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/boot/copy.S')
-rw-r--r--arch/x86/boot/copy.S101
1 files changed, 101 insertions, 0 deletions
diff --git a/arch/x86/boot/copy.S b/arch/x86/boot/copy.S
new file mode 100644
index 000000000000..ef127e56a3cf
--- /dev/null
+++ b/arch/x86/boot/copy.S
@@ -0,0 +1,101 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/copy.S
+ *
+ * Memory copy routines
+ */
+
+ .code16gcc
+ .text
+
+ .globl memcpy
+ .type memcpy, @function
+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
+ .size memcpy, .-memcpy
+
+ .globl memset
+ .type memset, @function
+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
+ .size memset, .-memset
+
+ .globl copy_from_fs
+ .type copy_from_fs, @function
+copy_from_fs:
+ pushw %ds
+ pushw %fs
+ popw %ds
+ call memcpy
+ popw %ds
+ ret
+ .size copy_from_fs, .-copy_from_fs
+
+ .globl copy_to_fs
+ .type copy_to_fs, @function
+copy_to_fs:
+ pushw %es
+ pushw %fs
+ popw %es
+ call memcpy
+ popw %es
+ ret
+ .size copy_to_fs, .-copy_to_fs
+
+#if 0 /* Not currently used, but can be enabled as needed */
+
+ .globl copy_from_gs
+ .type copy_from_gs, @function
+copy_from_gs:
+ pushw %ds
+ pushw %gs
+ popw %ds
+ call memcpy
+ popw %ds
+ ret
+ .size copy_from_gs, .-copy_from_gs
+ .globl copy_to_gs
+
+ .type copy_to_gs, @function
+copy_to_gs:
+ pushw %es
+ pushw %gs
+ popw %es
+ call memcpy
+ popw %es
+ ret
+ .size copy_to_gs, .-copy_to_gs
+
+#endif