linux/arch/arm26/lib/changebit.S
Linus Torvalds 1da177e4c3 Linux-2.6.12-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!
2005-04-16 15:20:36 -07:00

29 lines
735 B
ArmAsm

/*
* 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)