diff options
Diffstat (limited to 'arch/arm26/lib/clearbit.S')
| -rw-r--r-- | arch/arm26/lib/clearbit.S | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm26/lib/clearbit.S b/arch/arm26/lib/clearbit.S new file mode 100644 index 00000000000..0a895b0c759 --- /dev/null +++ b/arch/arm26/lib/clearbit.S @@ -0,0 +1,31 @@ +/* + * 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) + + |