| /* |
| * linux/arch/arm26/lib/clearbit.S |
| * |
| * Copyright (C) 1995-1996 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> |
| .text |
| |
| /* |
| * Purpose : Function to clear a bit |
| * Prototype: int clear_bit(int bit, void *addr) |
| */ |
| ENTRY(_clear_bit_be) |
| eor r0, r0, #0x18 @ big endian byte ordering |
| ENTRY(_clear_bit_le) |
| and r2, r0, #7 |
| mov r3, #1 |
| mov r3, r3, lsl r2 |
| save_and_disable_irqs ip, r2 |
| ldrb r2, [r1, r0, lsr #3] |
| bic r2, r2, r3 |
| strb r2, [r1, r0, lsr #3] |
| restore_irqs ip |
| RETINSTR(mov,pc,lr) |
| |
| |