https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 9f9499ae8e6415cefc4fe0a96ad0e27864353c89 authored by Linus Torvalds on 14 December 2015, 01:42:58 UTC
Linux 4.4-rc5
Linux 4.4-rc5
Tip revision: 9f9499a
copy.S
/* ----------------------------------------------------------------------- *
*
* 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