diff options
| author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
| commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
| tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/lib/changebit.S | |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/arm/lib/changebit.S')
| -rw-r--r-- | arch/arm/lib/changebit.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/lib/changebit.S b/arch/arm/lib/changebit.S new file mode 100644 index 00000000000..3af45cab70e --- /dev/null +++ b/arch/arm/lib/changebit.S @@ -0,0 +1,28 @@ +/* + * linux/arch/arm/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) |