1da177e4c3
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!
31 lines
735 B
ArmAsm
31 lines
735 B
ArmAsm
/*
|
|
* 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)
|
|
|
|
|