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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>
155 lines
2.7 KiB
ArmAsm
155 lines
2.7 KiB
ArmAsm
/*
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* Copyright (C) 2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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.text
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/*
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* unsigned long find_first_zero_bit(const unsigned long *addr,
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* unsigned long size)
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*/
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ENTRY(find_first_zero_bit)
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cp.w r11, 0
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reteq r11
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mov r9, r11
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1: ld.w r8, r12[0]
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com r8
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brne .L_found
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sub r12, -4
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sub r9, 32
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brgt 1b
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retal r11
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/*
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* unsigned long find_next_zero_bit(const unsigned long *addr,
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* unsigned long size,
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* unsigned long offset)
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*/
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ENTRY(find_next_zero_bit)
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lsr r8, r10, 5
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sub r9, r11, r10
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retle r11
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lsl r8, 2
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add r12, r8
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andl r10, 31, COH
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breq 1f
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/* offset is not word-aligned. Handle the first (32 - r10) bits */
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ld.w r8, r12[0]
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com r8
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sub r12, -4
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lsr r8, r8, r10
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brne .L_found
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/* r9 = r9 - (32 - r10) = r9 + r10 - 32 */
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add r9, r10
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sub r9, 32
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retle r11
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/* Main loop. offset must be word-aligned */
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1: ld.w r8, r12[0]
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com r8
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brne .L_found
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sub r12, -4
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sub r9, 32
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brgt 1b
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retal r11
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/* Common return path for when a bit is actually found. */
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.L_found:
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brev r8
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clz r10, r8
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rsub r9, r11
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add r10, r9
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/* XXX: If we don't have to return exactly "size" when the bit
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is not found, we may drop this "min" thing */
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min r12, r11, r10
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retal r12
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/*
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* unsigned long find_first_bit(const unsigned long *addr,
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* unsigned long size)
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*/
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ENTRY(find_first_bit)
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cp.w r11, 0
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reteq r11
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mov r9, r11
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1: ld.w r8, r12[0]
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cp.w r8, 0
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brne .L_found
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sub r12, -4
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sub r9, 32
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brgt 1b
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retal r11
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/*
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* unsigned long find_next_bit(const unsigned long *addr,
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* unsigned long size,
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* unsigned long offset)
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*/
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ENTRY(find_next_bit)
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lsr r8, r10, 5
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sub r9, r11, r10
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retle r11
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lsl r8, 2
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add r12, r8
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andl r10, 31, COH
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breq 1f
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/* offset is not word-aligned. Handle the first (32 - r10) bits */
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ld.w r8, r12[0]
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sub r12, -4
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lsr r8, r8, r10
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brne .L_found
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/* r9 = r9 - (32 - r10) = r9 + r10 - 32 */
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add r9, r10
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sub r9, 32
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retle r11
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/* Main loop. offset must be word-aligned */
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1: ld.w r8, r12[0]
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cp.w r8, 0
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brne .L_found
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sub r12, -4
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sub r9, 32
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brgt 1b
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retal r11
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ENTRY(generic_find_next_zero_le_bit)
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lsr r8, r10, 5
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sub r9, r11, r10
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retle r11
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lsl r8, 2
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add r12, r8
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andl r10, 31, COH
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breq 1f
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/* offset is not word-aligned. Handle the first (32 - r10) bits */
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ldswp.w r8, r12[0]
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sub r12, -4
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com r8
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lsr r8, r8, r10
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brne .L_found
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/* r9 = r9 - (32 - r10) = r9 + r10 - 32 */
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add r9, r10
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sub r9, 32
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retle r11
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/* Main loop. offset must be word-aligned */
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1: ldswp.w r8, r12[0]
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com r8
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brne .L_found
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sub r12, -4
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sub r9, 32
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brgt 1b
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retal r11
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