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1da177e4 LT |
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 | .outsb_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 .outsb_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 .outsb_align | |
51 | ||
52 | .outsb_aligned: stmfd sp!, {r4, r5, lr} | |
53 | ||
54 | subs r2, r2, #16 | |
55 | bmi .outsb_no_16 | |
56 | ||
57 | .outsb_16_lp: ldmia r1!, {r3, r4, r5, ip} | |
58 | outword r3 | |
59 | outword r4 | |
60 | outword r5 | |
61 | outword ip | |
62 | subs r2, r2, #16 | |
63 | bpl .outsb_16_lp | |
64 | ||
65 | tst r2, #15 | |
66 | LOADREGS(eqfd, sp!, {r4, r5, pc}) | |
67 | ||
68 | .outsb_no_16: tst r2, #8 | |
69 | beq .outsb_no_8 | |
70 | ||
71 | ldmia r1!, {r3, r4} | |
72 | outword r3 | |
73 | outword r4 | |
74 | ||
75 | .outsb_no_8: tst r2, #4 | |
76 | beq .outsb_no_4 | |
77 | ||
78 | ldr r3, [r1], #4 | |
79 | outword r3 | |
80 | ||
81 | .outsb_no_4: ands r2, r2, #3 | |
82 | LOADREGS(eqfd, sp!, {r4, r5, pc}) | |
83 | ||
84 | cmp r2, #2 | |
85 | ldrb r3, [r1], #1 | |
86 | strb r3, [r0] | |
87 | ldrgeb r3, [r1], #1 | |
88 | strgeb r3, [r0] | |
89 | ldrgtb r3, [r1] | |
90 | strgtb r3, [r0] | |
91 | ||
92 | LOADREGS(fd, sp!, {r4, r5, pc}) |