/* * linux/arch/arm26/lib/changebit.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 change a bit * Prototype: int change_bit(int bit, void *addr) */ ENTRY(_change_bit_be) eor r0, r0, #0x18 @ big endian byte ordering ENTRY(_change_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] eor r2, r2, r3 strb r2, [r1, r0, lsr #3] restore_irqs ip RETINSTR(mov,pc,lr)