projects / mirror_ubuntu-artful-kernel.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> | |
| 12 | ||
| 13 | .macro outword, rd | |
| 14 | #ifndef __ARMEB__ | |
| 15 | strh \rd, [r0] | |
| 16 | mov \rd, \rd, lsr #16 | |
| 17 | strh \rd, [r0] | |
| 18 | #else | |
| 19 | mov lr, \rd, lsr #16 | |
| 20 | strh lr, [r0] | |
| 21 | strh \rd, [r0] | |
| 22 | #endif | |
| 23 | .endm | |
| 24 | ||
| 25 | .outsw_align: movs ip, r1, lsl #31 | |
| 26 | bne .outsw_noalign | |
| 27 | ||
| 28 | ldrh r3, [r1], #2 | |
| 29 | sub r2, r2, #1 | |
| 30 | strh r3, [r0] | |
| 31 | ||
| 32 | ENTRY(__raw_writesw) | |
| 33 | teq r2, #0 | |
| 34 | moveq pc, lr | |
| 35 | ands r3, r1, #3 | |
| 36 | bne .outsw_align | |
| 37 | ||
| 38 | stmfd sp!, {r4, r5, lr} | |
| 39 | ||
| 40 | subs r2, r2, #8 | |
| 41 | bmi .no_outsw_8 | |
| 42 | ||
| 43 | .outsw_8_lp: ldmia r1!, {r3, r4, r5, ip} | |
| 44 | subs r2, r2, #8 | |
| 45 | outword r3 | |
| 46 | outword r4 | |
| 47 | outword r5 | |
| 48 | outword ip | |
| 49 | bpl .outsw_8_lp | |
| 50 | ||
| 51 | .no_outsw_8: tst r2, #4 | |
| 52 | beq .no_outsw_4 | |
| 53 | ||
| 54 | ldmia r1!, {r3, ip} | |
| 55 | outword r3 | |
| 56 | outword ip | |
| 57 | ||
| 58 | .no_outsw_4: movs r2, r2, lsl #31 | |
| 59 | bcc .no_outsw_2 | |
| 60 | ||
| 61 | ldr r3, [r1], #4 | |
| 62 | outword r3 | |
| 63 | ||
| 64 | .no_outsw_2: ldrneh r3, [r1] | |
| 65 | strneh r3, [r0] | |
| 66 | ||
| 67 | ldmfd sp!, {r4, r5, pc} | |
| 68 | ||
| 69 | #ifdef __ARMEB__ | |
| 70 | #define pull_hbyte0 lsl #8 | |
| 71 | #define push_hbyte1 lsr #24 | |
| 72 | #else | |
| 73 | #define pull_hbyte0 lsr #24 | |
| 74 | #define push_hbyte1 lsl #8 | |
| 75 | #endif | |
| 76 | ||
| 77 | .outsw_noalign: ldr r3, [r1, -r3]! | |
| 78 | subcs r2, r2, #1 | |
| 79 | bcs 2f | |
| 80 | subs r2, r2, #2 | |
| 81 | bmi 3f | |
| 82 | ||
| 83 | 1: mov ip, r3, lsr #8 | |
| 84 | strh ip, [r0] | |
| 85 | 2: mov ip, r3, pull_hbyte0 | |
| 86 | ldr r3, [r1, #4]! | |
| 87 | subs r2, r2, #2 | |
| 88 | orr ip, ip, r3, push_hbyte1 | |
| 89 | strh ip, [r0] | |
| 90 | bpl 2b | |
| 91 | ||
| 92 | 3: tst r2, #1 | |
| 93 | 2: movne ip, r3, lsr #8 | |
| 94 | strneh ip, [r0] | |
| 95 | mov pc, lr |