diff options
Diffstat (limited to 'arch/arm/lib/testchangebit.S')
| -rw-r--r-- | arch/arm/lib/testchangebit.S | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/lib/testchangebit.S b/arch/arm/lib/testchangebit.S new file mode 100644 index 00000000000..4aba4676b98 --- /dev/null +++ b/arch/arm/lib/testchangebit.S @@ -0,0 +1,29 @@ +/* + * linux/arch/arm/lib/testchangebit.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 + +ENTRY(_test_and_change_bit_be) + eor r0, r0, #0x18 @ big endian byte ordering +ENTRY(_test_and_change_bit_le) + add r1, r1, r0, lsr #3 + and r3, r0, #7 + mov r0, #1 + save_and_disable_irqs ip, r2 + ldrb r2, [r1] + tst r2, r0, lsl r3 + eor r2, r2, r0, lsl r3 + strb r2, [r1] + restore_irqs ip + moveq r0, #0 + RETINSTR(mov,pc,lr) + + |