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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
| commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
| tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/x86/boot/copy.S | |
| parent | Initial commit. (diff) | |
| download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip | |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/boot/copy.S')
| -rw-r--r-- | arch/x86/boot/copy.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/x86/boot/copy.S b/arch/x86/boot/copy.S new file mode 100644 index 000000000..6afd05e81 --- /dev/null +++ b/arch/x86/boot/copy.S @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* ----------------------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * ----------------------------------------------------------------------- */ + +#include <linux/linkage.h> + +/* + * Memory copy routines + */ + + .code16 + .text + +SYM_FUNC_START_NOALIGN(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 +SYM_FUNC_END(memcpy) + +SYM_FUNC_START_NOALIGN(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 +SYM_FUNC_END(memset) + +SYM_FUNC_START_NOALIGN(copy_from_fs) + pushw %ds + pushw %fs + popw %ds + calll memcpy + popw %ds + retl +SYM_FUNC_END(copy_from_fs) + +SYM_FUNC_START_NOALIGN(copy_to_fs) + pushw %es + pushw %fs + popw %es + calll memcpy + popw %es + retl +SYM_FUNC_END(copy_to_fs) |