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1 | /* |
2 | * linux/arch/arm/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 | |
13 | .macro outword, rd |
14 | #ifndef __ARMEB__ |
15 | strb \rd, [r0] |
16 | mov \rd, \rd, lsr #8 |
17 | strb \rd, [r0] |
18 | mov \rd, \rd, lsr #8 |
19 | strb \rd, [r0] |
20 | mov \rd, \rd, lsr #8 |
21 | strb \rd, [r0] |
22 | #else |
23 | mov lr, \rd, lsr #24 |
24 | strb lr, [r0] |
25 | mov lr, \rd, lsr #16 |
26 | strb lr, [r0] |
27 | mov lr, \rd, lsr #8 |
28 | strb lr, [r0] |
29 | strb \rd, [r0] |
30 | #endif |
31 | .endm |
32 | |
33 | .Loutsb_align: rsb ip, ip, #4 |
34 | cmp ip, r2 |
35 | movgt ip, r2 |
36 | cmp ip, #2 |
37 | ldrb r3, [r1], #1 |
38 | strb r3, [r0] |
39 | ldrgeb r3, [r1], #1 |
40 | strgeb r3, [r0] |
41 | ldrgtb r3, [r1], #1 |
42 | strgtb r3, [r0] |
43 | subs r2, r2, ip |
44 | bne .Loutsb_aligned |
45 | |
46 | ENTRY(__raw_writesb) |
47 | teq r2, #0 @ do we have to check for the zero len? |
48 | moveq pc, lr |
49 | ands ip, r1, #3 |
50 | bne .Loutsb_align |
51 | |
52 | .Loutsb_aligned: |
53 | stmfd sp!, {r4, r5, lr} |
54 | |
55 | subs r2, r2, #16 |
56 | bmi .Loutsb_no_16 |
57 | |
58 | .Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip} |
59 | outword r3 |
60 | outword r4 |
61 | outword r5 |
62 | outword ip |
63 | subs r2, r2, #16 |
64 | bpl .Loutsb_16_lp |
65 | |
66 | tst r2, #15 |
67 | ldmeqfd sp!, {r4, r5, pc} |
68 | |
69 | .Loutsb_no_16: tst r2, #8 |
70 | beq .Loutsb_no_8 |
71 | |
72 | ldmia r1!, {r3, r4} |
73 | outword r3 |
74 | outword r4 |
75 | |
76 | .Loutsb_no_8: tst r2, #4 |
77 | beq .Loutsb_no_4 |
78 | |
79 | ldr r3, [r1], #4 |
80 | outword r3 |
81 | |
82 | .Loutsb_no_4: ands r2, r2, #3 |
83 | ldmeqfd sp!, {r4, r5, pc} |
84 | |
85 | cmp r2, #2 |
86 | ldrb r3, [r1], #1 |
87 | strb r3, [r0] |
88 | ldrgeb r3, [r1], #1 |
89 | strgeb r3, [r0] |
90 | ldrgtb r3, [r1] |
91 | strgtb r3, [r0] |
92 | |
93 | ldmfd sp!, {r4, r5, pc} |
94 | ENDPROC(__raw_writesb) |
95 |
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