Subversion Repositories or1k

/*

 *  linux/arch/arm/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 

#include 

                .text

/*

 * Purpose  : Function to clear a bit

 * Prototype: int clear_bit(int bit, void *addr)

 */

ENTRY(clear_bit)

                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)