projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/arm/lib/io-writesw-armv4.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> | |
| 4dd1837d | 12 | #include <asm/export.h> |
| 1da177e4 LT |
13 | |
| 14 | .macro outword, rd | |
| 15 | #ifndef __ARMEB__ | |
| 16 | strh \rd, [r0] | |
| 17 | mov \rd, \rd, lsr #16 | |
| 18 | strh \rd, [r0] | |
| 19 | #else | |
| 20 | mov lr, \rd, lsr #16 | |
| 21 | strh lr, [r0] | |
| 22 | strh \rd, [r0] | |
| 23 | #endif | |
| 24 | .endm | |
| 25 | ||
| a9c4814d NP |
26 | .Loutsw_align: movs ip, r1, lsl #31 |
| 27 | bne .Loutsw_noalign | |
| 1da177e4 LT |
28 | |
| 29 | ldrh r3, [r1], #2 | |
| 30 | sub r2, r2, #1 | |
| 31 | strh r3, [r0] | |
| 32 | ||
| 33 | ENTRY(__raw_writesw) | |
| 34 | teq r2, #0 | |
| 6ebbf2ce | 35 | reteq lr |
| 1da177e4 | 36 | ands r3, r1, #3 |
| a9c4814d | 37 | bne .Loutsw_align |
| 1da177e4 LT |
38 | |
| 39 | stmfd sp!, {r4, r5, lr} | |
| 40 | ||
| 41 | subs r2, r2, #8 | |
| a9c4814d | 42 | bmi .Lno_outsw_8 |
| 1da177e4 | 43 | |
| a9c4814d | 44 | .Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip} |
| 1da177e4 LT |
45 | subs r2, r2, #8 |
| 46 | outword r3 | |
| 47 | outword r4 | |
| 48 | outword r5 | |
| 49 | outword ip | |
| a9c4814d | 50 | bpl .Loutsw_8_lp |
| 1da177e4 | 51 | |
| a9c4814d NP |
52 | .Lno_outsw_8: tst r2, #4 |
| 53 | beq .Lno_outsw_4 | |
| 1da177e4 LT |
54 | |
| 55 | ldmia r1!, {r3, ip} | |
| 56 | outword r3 | |
| 57 | outword ip | |
| 58 | ||
| a9c4814d NP |
59 | .Lno_outsw_4: movs r2, r2, lsl #31 |
| 60 | bcc .Lno_outsw_2 | |
| 1da177e4 LT |
61 | |
| 62 | ldr r3, [r1], #4 | |
| 63 | outword r3 | |
| 64 | ||
| a9c4814d | 65 | .Lno_outsw_2: ldrneh r3, [r1] |
| 1da177e4 LT |
66 | strneh r3, [r0] |
| 67 | ||
| 68 | ldmfd sp!, {r4, r5, pc} | |
| 69 | ||
| 70 | #ifdef __ARMEB__ | |
| 71 | #define pull_hbyte0 lsl #8 | |
| 72 | #define push_hbyte1 lsr #24 | |
| 73 | #else | |
| 74 | #define pull_hbyte0 lsr #24 | |
| 75 | #define push_hbyte1 lsl #8 | |
| 76 | #endif | |
| 77 | ||
| a9c4814d | 78 | .Loutsw_noalign: |
| 8b592783 CM |
79 | ARM( ldr r3, [r1, -r3]! ) |
| 80 | THUMB( rsb r3, r3, #0 ) | |
| 81 | THUMB( ldr r3, [r1, r3] ) | |
| 82 | THUMB( sub r1, r3 ) | |
| 1da177e4 LT |
83 | subcs r2, r2, #1 |
| 84 | bcs 2f | |
| 85 | subs r2, r2, #2 | |
| 86 | bmi 3f | |
| 87 | ||
| 88 | 1: mov ip, r3, lsr #8 | |
| 89 | strh ip, [r0] | |
| 90 | 2: mov ip, r3, pull_hbyte0 | |
| 91 | ldr r3, [r1, #4]! | |
| 92 | subs r2, r2, #2 | |
| 93 | orr ip, ip, r3, push_hbyte1 | |
| 94 | strh ip, [r0] | |
| aeabbbbe | 95 | bpl 1b |
| 1da177e4 | 96 | |
| aeabbbbe NP |
97 | tst r2, #1 |
| 98 | 3: movne ip, r3, lsr #8 | |
| 1da177e4 | 99 | strneh ip, [r0] |
| 6ebbf2ce | 100 | ret lr |
| 93ed3970 | 101 | ENDPROC(__raw_writesw) |
| 4dd1837d | 102 | EXPORT_SYMBOL(__raw_writesw) |