Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm / 2f7955509710fd378a1ac96e19d29d5a0e3301fd / . / arch / x86 / boot / copy.S
blob: 11f272c6f5e9e0c2fcf11b030ee6d6df3cf2dd64 [file] [log] [blame]
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]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
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]11#include <linux/linkage.h>
12
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]13/*
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]14 * Memory copy routines
15 */
16
17 .code16gcc
18 .text
19
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]20GLOBAL(memcpy)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]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 ret
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]34ENDPROC(memcpy)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]35
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]36GLOBAL(memset)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]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 ret
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]49ENDPROC(memset)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]50
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]51GLOBAL(copy_from_fs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]52 pushw %ds
53 pushw %fs
54 popw %ds
55 call memcpy
56 popw %ds
57 ret
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]58ENDPROC(copy_from_fs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]59
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]60GLOBAL(copy_to_fs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]61 pushw %es
62 pushw %fs
63 popw %es
64 call memcpy
65 popw %es
66 ret
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]67ENDPROC(copy_to_fs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]68
69#if 0 /* Not currently used, but can be enabled as needed */
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]70GLOBAL(copy_from_gs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]71 pushw %ds
72 pushw %gs
73 popw %ds
74 call memcpy
75 popw %ds
76 ret
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]77ENDPROC(copy_from_gs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]78
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]79GLOBAL(copy_to_gs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]80 pushw %es
81 pushw %gs
82 popw %es
83 call memcpy
84 popw %es
85 ret
Cyrill Gorcunov2f795552009-02-14 00:50:20 +0300[diff] [blame^]86ENDPROC(copy_to_gs)
H. Peter Anvin5be86562007-07-11 12:18:41 -0700[diff] [blame]87#endif