| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/lib/changebit.S |
| 3 | * |
| 4 | * Copyright (C) 1995-1996 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 | .text |
| 13 | |
| 14 | /* Purpose : Function to change a bit |
| 15 | * Prototype: int change_bit(int bit, void *addr) |
| 16 | */ |
| 17 | ENTRY(_change_bit_be) |
| 18 | eor r0, r0, #0x18 @ big endian byte ordering |
| 19 | ENTRY(_change_bit_le) |
| 20 | and r2, r0, #7 |
| 21 | mov r3, #1 |
| 22 | mov r3, r3, lsl r2 |
| 23 | save_and_disable_irqs ip, r2 |
| 24 | ldrb r2, [r1, r0, lsr #3] |
| 25 | eor r2, r2, r3 |
| 26 | strb r2, [r1, r0, lsr #3] |
| 27 | restore_irqs ip |
| 28 | RETINSTR(mov,pc,lr) |