1/* ----------------------------------------------------------------------- *
 2 *
 3 *   Copyright (C) 1991, 1992 Linus Torvalds
 4 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 5 *
 6 *   This file is part of the Linux kernel, and is made available under
 7 *   the terms of the GNU General Public License version 2.
 8 *
 9 * ----------------------------------------------------------------------- */
10
11#include <linux/linkage.h>
12
13/*
14 * Memory copy routines
15 */
16
17	.code16
18	.text
19
20GLOBAL(memcpy)
21	pushw	%si
22	pushw	%di
23	movw	%ax, %di
24	movw	%dx, %si
25	pushw	%cx
26	shrw	$2, %cx
27	rep; movsl
28	popw	%cx
29	andw	$3, %cx
30	rep; movsb
31	popw	%di
32	popw	%si
33	retl
34ENDPROC(memcpy)
35
36GLOBAL(memset)
37	pushw	%di
38	movw	%ax, %di
39	movzbl	%dl, %eax
40	imull	$0x01010101,%eax
41	pushw	%cx
42	shrw	$2, %cx
43	rep; stosl
44	popw	%cx
45	andw	$3, %cx
46	rep; stosb
47	popw	%di
48	retl
49ENDPROC(memset)
50
51GLOBAL(copy_from_fs)
52	pushw	%ds
53	pushw	%fs
54	popw	%ds
55	calll	memcpy
56	popw	%ds
57	retl
58ENDPROC(copy_from_fs)
59
60GLOBAL(copy_to_fs)
61	pushw	%es
62	pushw	%fs
63	popw	%es
64	calll	memcpy
65	popw	%es
66	retl
67ENDPROC(copy_to_fs)
68
69#if 0 /* Not currently used, but can be enabled as needed */
70GLOBAL(copy_from_gs)
71	pushw	%ds
72	pushw	%gs
73	popw	%ds
74	calll	memcpy
75	popw	%ds
76	retl
77ENDPROC(copy_from_gs)
78
79GLOBAL(copy_to_gs)
80	pushw	%es
81	pushw	%gs
82	popw	%es
83	calll	memcpy
84	popw	%es
85	retl
86ENDPROC(copy_to_gs)
87#endif

 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
18SYM_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
32SYM_FUNC_END(memcpy)
33
34SYM_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
47SYM_FUNC_END(memset)
48
49SYM_FUNC_START_NOALIGN(copy_from_fs)
50	pushw	%ds
51	pushw	%fs
52	popw	%ds
53	calll	memcpy
54	popw	%ds
55	retl
56SYM_FUNC_END(copy_from_fs)
57
58SYM_FUNC_START_NOALIGN(copy_to_fs)
59	pushw	%es
60	pushw	%fs
61	popw	%es
62	calll	memcpy
63	popw	%es
64	retl
65SYM_FUNC_END(copy_to_fs)