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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/boot/copy.S
10818 views
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/* ----------------------------------------------------------------------- *

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 *

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 *   Copyright (C) 1991, 1992 Linus Torvalds

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 *   Copyright 2007 rPath, Inc. - All Rights Reserved

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 *

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 *   This file is part of the Linux kernel, and is made available under

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 *   the terms of the GNU General Public License version 2.

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 *

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 * ----------------------------------------------------------------------- */

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#include <linux/linkage.h>

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/*

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 * Memory copy routines

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 */

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	.code16gcc

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	.text

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GLOBAL(memcpy)

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	pushw	%si

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	pushw	%di

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	movw	%ax, %di

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	movw	%dx, %si

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	pushw	%cx

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	shrw	$2, %cx

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	rep; movsl

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	popw	%cx

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	andw	$3, %cx

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	rep; movsb

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	popw	%di

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	popw	%si

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	ret

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ENDPROC(memcpy)

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GLOBAL(memset)

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	pushw	%di

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	movw	%ax, %di

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	movzbl	%dl, %eax

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	imull	$0x01010101,%eax

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	pushw	%cx

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	shrw	$2, %cx

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	rep; stosl

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	popw	%cx

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	andw	$3, %cx

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	rep; stosb

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	popw	%di

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	ret

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ENDPROC(memset)

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GLOBAL(copy_from_fs)

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	pushw	%ds

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	pushw	%fs

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	popw	%ds

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	call	memcpy

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	popw	%ds

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	ret

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ENDPROC(copy_from_fs)

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GLOBAL(copy_to_fs)

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	pushw	%es

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	pushw	%fs

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	popw	%es

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	call	memcpy

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	popw	%es

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	ret

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ENDPROC(copy_to_fs)

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#if 0 /* Not currently used, but can be enabled as needed */

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GLOBAL(copy_from_gs)

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	pushw	%ds

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	pushw	%gs

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	popw	%ds

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	call	memcpy

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	popw	%ds

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	ret

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ENDPROC(copy_from_gs)

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GLOBAL(copy_to_gs)

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	pushw	%es

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	pushw	%gs

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	popw	%es

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	call	memcpy

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	popw	%es

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	ret

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ENDPROC(copy_to_gs)

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#endif

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