Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/boot/copy.S
26439 views
1
/* SPDX-License-Identifier: GPL-2.0-only */

2
/* ----------------------------------------------------------------------- *

3
 *

4
 *   Copyright (C) 1991, 1992 Linus Torvalds

5
 *   Copyright 2007 rPath, Inc. - All Rights Reserved

6
 *

7
 * ----------------------------------------------------------------------- */

8


9
#include <linux/linkage.h>

10


11
/*

12
 * Memory copy routines

13
 */

14


15
	.code16

16
	.text

17


18
SYM_FUNC_START_NOALIGN(memcpy)

19
	pushw	%si

20
	pushw	%di

21
	movw	%ax, %di

22
	movw	%dx, %si

23
	pushw	%cx

24
	shrw	$2, %cx

25
	rep movsl

26
	popw	%cx

27
	andw	$3, %cx

28
	rep movsb

29
	popw	%di

30
	popw	%si

31
	retl

32
SYM_FUNC_END(memcpy)

33


34
SYM_FUNC_START_NOALIGN(memset)

35
	pushw	%di

36
	movw	%ax, %di

37
	movzbl	%dl, %eax

38
	imull	$0x01010101,%eax

39
	pushw	%cx

40
	shrw	$2, %cx

41
	rep stosl

42
	popw	%cx

43
	andw	$3, %cx

44
	rep stosb

45
	popw	%di

46
	retl

47
SYM_FUNC_END(memset)

48


49
SYM_FUNC_START_NOALIGN(copy_from_fs)

50
	pushw	%ds

51
	pushw	%fs

52
	popw	%ds

53
	calll	memcpy

54
	popw	%ds

55
	retl

56
SYM_FUNC_END(copy_from_fs)

57


58
SYM_FUNC_START_NOALIGN(copy_to_fs)

59
	pushw	%es

60
	pushw	%fs

61
	popw	%es

62
	calll	memcpy

63
	popw	%es

64
	retl

65
SYM_FUNC_END(copy_to_fs)

66


67