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 */ 17ENTRY(_change_bit_be) 18 eor r0, r0, #0x18 @ big endian byte ordering 19ENTRY(_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) 29