aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/lib/io-writesw-armv3.S
blob: cb94b9b4940569f6c81f5fa316223388ff00939b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
/*
 *  linux/arch/arm/lib/io-writesw-armv3.S
 *
 *  Copyright (C) 1995-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/linkage.h>
#include <asm/assembler.h>

.Loutsw_bad_alignment:
		adr	r0, .Loutsw_bad_align_msg
		mov	r2, lr
		b	panic
.Loutsw_bad_align_msg:
		.asciz	"outsw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
		.align

.Loutsw_align:	tst	r1, #1
		bne	.Loutsw_bad_alignment

		add	r1, r1, #2

		ldr	r3, [r1, #-4]
		mov	r3, r3, lsr #16
		orr	r3, r3, r3, lsl #16
		str	r3, [r0]
		subs	r2, r2, #1
		reteq	lr

ENTRY(__raw_writesw)
		teq	r2, #0		@ do we have to check for the zero len?
		reteq	lr
		tst	r1, #3
		bne	.Loutsw_align

		stmfd	sp!, {r4, r5, r6, lr}

		subs	r2, r2, #8
		bmi	.Lno_outsw_8

.Loutsw_8_lp:	ldmia	r1!, {r3, r4, r5, r6}

		mov	ip, r3, lsl #16
		orr	ip, ip, ip, lsr #16
		str	ip, [r0]

		mov	ip, r3, lsr #16
		orr	ip, ip, ip, lsl #16
		str	ip, [r0]

		mov	ip, r4, lsl #16
		orr	ip, ip, ip, lsr #16
		str	ip, [r0]

		mov	ip, r4, lsr #16
		orr	ip, ip, ip, lsl #16
		str	ip, [r0]

		mov	ip, r5, lsl #16
		orr	ip, ip, ip, lsr #16
		str	ip, [r0]

		mov	ip, r5, lsr #16
		orr	ip, ip, ip, lsl #16
		str	ip, [r0]

		mov	ip, r6, lsl #16
		orr	ip, ip, ip, lsr #16
		str	ip, [r0]

		mov	ip, r6, lsr #16
		orr	ip, ip, ip, lsl #16
		str	ip, [r0]

		subs	r2, r2, #8
		bpl	.Loutsw_8_lp

		tst	r2, #7
		ldmfdeq	sp!, {r4, r5, r6, pc}

.Lno_outsw_8:	tst	r2, #4
		beq	.Lno_outsw_4

		ldmia	r1!, {r3, r4}

		mov	ip, r3, lsl #16
		orr	ip, ip, ip, lsr #16
		str	ip, [r0]

		mov	ip, r3, lsr #16
		orr	ip, ip, ip, lsl #16
		str	ip, [r0]

		mov	ip, r4, lsl #16
		orr	ip, ip, ip, lsr #16
		str	ip, [r0]

		mov	ip, r4, lsr #16
		orr	ip, ip, ip, lsl #16
		str	ip, [r0]

.Lno_outsw_4:	tst	r2, #2
		beq	.Lno_outsw_2

		ldr	r3, [r1], #4

		mov	ip, r3, lsl #16
		orr	ip, ip, ip, lsr #16
		str	ip, [r0]

		mov	ip, r3, lsr #16
		orr	ip, ip, ip, lsl #16
		str	ip, [r0]

.Lno_outsw_2:	tst	r2, #1

		ldrne	r3, [r1]

		movne	ip, r3, lsl #16
		orrne	ip, ip, ip, lsr #16
		strne	ip, [r0]

		ldmfd	sp!, {r4, r5, r6, pc}

Privacy Policy