| /* |
| * linux/arch/arm/lib/io-writesb.S |
| * |
| * Copyright (C) 1995-2000 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| .macro outword, rd |
| #ifndef __ARMEB__ |
| strb \rd, [r0] |
| mov \rd, \rd, lsr #8 |
| strb \rd, [r0] |
| mov \rd, \rd, lsr #8 |
| strb \rd, [r0] |
| mov \rd, \rd, lsr #8 |
| strb \rd, [r0] |
| #else |
| mov lr, \rd, lsr #24 |
| strb lr, [r0] |
| mov lr, \rd, lsr #16 |
| strb lr, [r0] |
| mov lr, \rd, lsr #8 |
| strb lr, [r0] |
| strb \rd, [r0] |
| #endif |
| .endm |
| |
| .Loutsb_align: rsb ip, ip, #4 |
| cmp ip, r2 |
| movgt ip, r2 |
| cmp ip, #2 |
| ldrb r3, [r1], #1 |
| strb r3, [r0] |
| ldrgeb r3, [r1], #1 |
| strgeb r3, [r0] |
| ldrgtb r3, [r1], #1 |
| strgtb r3, [r0] |
| subs r2, r2, ip |
| bne .Loutsb_aligned |
| |
| ENTRY(__raw_writesb) |
| teq r2, #0 @ do we have to check for the zero len? |
| moveq pc, lr |
| ands ip, r1, #3 |
| bne .Loutsb_align |
| |
| .Loutsb_aligned: |
| stmfd sp!, {r4, r5, lr} |
| |
| subs r2, r2, #16 |
| bmi .Loutsb_no_16 |
| |
| .Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip} |
| outword r3 |
| outword r4 |
| outword r5 |
| outword ip |
| subs r2, r2, #16 |
| bpl .Loutsb_16_lp |
| |
| tst r2, #15 |
| ldmeqfd sp!, {r4, r5, pc} |
| |
| .Loutsb_no_16: tst r2, #8 |
| beq .Loutsb_no_8 |
| |
| ldmia r1!, {r3, r4} |
| outword r3 |
| outword r4 |
| |
| .Loutsb_no_8: tst r2, #4 |
| beq .Loutsb_no_4 |
| |
| ldr r3, [r1], #4 |
| outword r3 |
| |
| .Loutsb_no_4: ands r2, r2, #3 |
| ldmeqfd sp!, {r4, r5, pc} |
| |
| cmp r2, #2 |
| ldrb r3, [r1], #1 |
| strb r3, [r0] |
| ldrgeb r3, [r1], #1 |
| strgeb r3, [r0] |
| ldrgtb r3, [r1] |
| strgtb r3, [r0] |
| |
| ldmfd sp!, {r4, r5, pc} |
| ENDPROC(__raw_writesb) |
