168c8fa32f
The existing implementation of this function seems to be looking for a one although it should be looking for a zero. This causes trouble for the ext2 filesystem, which tends to report -ENOSPC without this patch. Fix this by complementing each word before scanning. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
156 lines
2.7 KiB
ArmAsm
156 lines
2.7 KiB
ArmAsm
/*
|
|
* Copyright (C) 2006 Atmel Corporation
|
|
*
|
|
* 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>
|
|
|
|
.text
|
|
/*
|
|
* unsigned long find_first_zero_bit(const unsigned long *addr,
|
|
* unsigned long size)
|
|
*/
|
|
ENTRY(find_first_zero_bit)
|
|
cp.w r11, 0
|
|
reteq r11
|
|
mov r9, r11
|
|
1: ld.w r8, r12[0]
|
|
com r8
|
|
brne .L_found
|
|
sub r12, -4
|
|
sub r9, 32
|
|
brgt 1b
|
|
retal r11
|
|
|
|
/*
|
|
* unsigned long find_next_zero_bit(const unsigned long *addr,
|
|
* unsigned long size,
|
|
* unsigned long offset)
|
|
*/
|
|
ENTRY(find_next_zero_bit)
|
|
lsr r8, r10, 5
|
|
sub r9, r11, r10
|
|
retle r11
|
|
|
|
lsl r8, 2
|
|
add r12, r8
|
|
andl r10, 31, COH
|
|
breq 1f
|
|
|
|
/* offset is not word-aligned. Handle the first (32 - r10) bits */
|
|
ld.w r8, r12[0]
|
|
com r8
|
|
sub r12, -4
|
|
lsr r8, r8, r10
|
|
brne .L_found
|
|
|
|
/* r9 = r9 - (32 - r10) = r9 + r10 - 32 */
|
|
add r9, r10
|
|
sub r9, 32
|
|
retle r11
|
|
|
|
/* Main loop. offset must be word-aligned */
|
|
1: ld.w r8, r12[0]
|
|
com r8
|
|
brne .L_found
|
|
sub r12, -4
|
|
sub r9, 32
|
|
brgt 1b
|
|
retal r11
|
|
|
|
/* Common return path for when a bit is actually found. */
|
|
.L_found:
|
|
brev r8
|
|
clz r10, r8
|
|
rsub r9, r11
|
|
add r10, r9
|
|
|
|
/* XXX: If we don't have to return exactly "size" when the bit
|
|
is not found, we may drop this "min" thing */
|
|
min r12, r11, r10
|
|
retal r12
|
|
|
|
/*
|
|
* unsigned long find_first_bit(const unsigned long *addr,
|
|
* unsigned long size)
|
|
*/
|
|
ENTRY(find_first_bit)
|
|
cp.w r11, 0
|
|
reteq r11
|
|
mov r9, r11
|
|
1: ld.w r8, r12[0]
|
|
cp.w r8, 0
|
|
brne .L_found
|
|
sub r12, -4
|
|
sub r9, 32
|
|
brgt 1b
|
|
retal r11
|
|
|
|
/*
|
|
* unsigned long find_next_bit(const unsigned long *addr,
|
|
* unsigned long size,
|
|
* unsigned long offset)
|
|
*/
|
|
ENTRY(find_next_bit)
|
|
lsr r8, r10, 5
|
|
sub r9, r11, r10
|
|
retle r11
|
|
|
|
lsl r8, 2
|
|
add r12, r8
|
|
andl r10, 31, COH
|
|
breq 1f
|
|
|
|
/* offset is not word-aligned. Handle the first (32 - r10) bits */
|
|
ld.w r8, r12[0]
|
|
sub r12, -4
|
|
lsr r8, r8, r10
|
|
brne .L_found
|
|
|
|
/* r9 = r9 - (32 - r10) = r9 + r10 - 32 */
|
|
add r9, r10
|
|
sub r9, 32
|
|
retle r11
|
|
|
|
/* Main loop. offset must be word-aligned */
|
|
1: ld.w r8, r12[0]
|
|
cp.w r8, 0
|
|
brne .L_found
|
|
sub r12, -4
|
|
sub r9, 32
|
|
brgt 1b
|
|
retal r11
|
|
|
|
ENTRY(generic_find_next_zero_le_bit)
|
|
lsr r8, r10, 5
|
|
sub r9, r11, r10
|
|
retle r11
|
|
|
|
lsl r8, 2
|
|
add r12, r8
|
|
andl r10, 31, COH
|
|
breq 1f
|
|
|
|
/* offset is not word-aligned. Handle the first (32 - r10) bits */
|
|
ldswp.w r8, r12[0]
|
|
sub r12, -4
|
|
com r8
|
|
lsr r8, r8, r10
|
|
brne .L_found
|
|
|
|
/* r9 = r9 - (32 - r10) = r9 + r10 - 32 */
|
|
add r9, r10
|
|
sub r9, 32
|
|
retle r11
|
|
|
|
/* Main loop. offset must be word-aligned */
|
|
1: ldswp.w r8, r12[0]
|
|
com r8
|
|
brne .L_found
|
|
sub r12, -4
|
|
sub r9, 32
|
|
brgt 1b
|
|
retal r11
|