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gerrit-public.fairphone.software / kernel / msm-4.19 / 299cc3c166f7a11f6cc3b66aafbaf75c2aa0e0e2 / . / arch / arm26 / lib / io-writesb.S
blob: 16251b4d51015fe9c7a446f61fd3fa735c2f422d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 * linux/arch/arm26/lib/io-writesb.S
3 *
4 * Copyright (C) 1995-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/linkage.h>
11#include <asm/assembler.h>
12#include <asm/hardware.h>
13
14.outsb_align: rsb ip, ip, #4
15 cmp ip, r2
16 movgt ip, r2
17 cmp ip, #2
18 ldrb r3, [r1], #1
19 strb r3, [r0]
20 ldrgeb r3, [r1], #1
21 strgeb r3, [r0]
22 ldrgtb r3, [r1], #1
23 strgtb r3, [r0]
24 subs r2, r2, ip
25 bne .outsb_aligned
26
27ENTRY(__raw_writesb)
28 teq r2, #0 @ do we have to check for the zero len?
29 moveq pc, lr
30 ands ip, r1, #3
31 bne .outsb_align
32
33.outsb_aligned: stmfd sp!, {r4 - r6, lr}
34
35 subs r2, r2, #16
36 bmi .outsb_no_16
37
38.outsb_16_lp: ldmia r1!, {r3 - r6}
39
40 strb r3, [r0]
41 mov r3, r3, lsr #8
42 strb r3, [r0]
43 mov r3, r3, lsr #8
44 strb r3, [r0]
45 mov r3, r3, lsr #8
46 strb r3, [r0]
47
48 strb r4, [r0]
49 mov r4, r4, lsr #8
50 strb r4, [r0]
51 mov r4, r4, lsr #8
52 strb r4, [r0]
53 mov r4, r4, lsr #8
54 strb r4, [r0]
55
56 strb r5, [r0]
57 mov r5, r5, lsr #8
58 strb r5, [r0]
59 mov r5, r5, lsr #8
60 strb r5, [r0]
61 mov r5, r5, lsr #8
62 strb r5, [r0]
63
64 strb r6, [r0]
65 mov r6, r6, lsr #8
66 strb r6, [r0]
67 mov r6, r6, lsr #8
68 strb r6, [r0]
69 mov r6, r6, lsr #8
70 strb r6, [r0]
71
72 subs r2, r2, #16
73 bpl .outsb_16_lp
74
75 tst r2, #15
76 LOADREGS(eqfd, sp!, {r4 - r6, pc})
77
78.outsb_no_16: tst r2, #8
79 beq .outsb_no_8
80
81 ldmia r1!, {r3, r4}
82
83 strb r3, [r0]
84 mov r3, r3, lsr #8
85 strb r3, [r0]
86 mov r3, r3, lsr #8
87 strb r3, [r0]
88 mov r3, r3, lsr #8
89 strb r3, [r0]
90
91 strb r4, [r0]
92 mov r4, r4, lsr #8
93 strb r4, [r0]
94 mov r4, r4, lsr #8
95 strb r4, [r0]
96 mov r4, r4, lsr #8
97 strb r4, [r0]
98
99.outsb_no_8: tst r2, #4
100 beq .outsb_no_4
101
102 ldr r3, [r1], #4
103 strb r3, [r0]
104 mov r3, r3, lsr #8
105 strb r3, [r0]
106 mov r3, r3, lsr #8
107 strb r3, [r0]
108 mov r3, r3, lsr #8
109 strb r3, [r0]
110
111.outsb_no_4: ands r2, r2, #3
112 LOADREGS(eqfd, sp!, {r4 - r6, pc})
113
114 cmp r2, #2
115 ldrb r3, [r1], #1
116 strb r3, [r0]
117 ldrgeb r3, [r1], #1
118 strgeb r3, [r0]
119 ldrgtb r3, [r1]
120 strgtb r3, [r0]
121
122 LOADREGS(fd, sp!, {r4 - r6, pc})