From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/x86/boot/copy.S | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 arch/x86/boot/copy.S (limited to 'arch/x86/boot/copy.S') 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 + +/* + * 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) -- cgit v1.2.3