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gerrit-public.fairphone.software / kernel / msm-4.9 / 67d59b608905d09e69284e17e9865cbc5fd4072e / . / arch / mips / lib / bitops.c
blob: 3b2a1e78a54369fc43bf052288f3fc7acaac5ae4 [file] [log] [blame]
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 1994-1997, 99, 2000, 06, 07 Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (c) 1999, 2000 Silicon Graphics, Inc.
8 */
9#include <linux/bitops.h>
10#include <linux/irqflags.h>
11#include <linux/export.h>
12
13
14/**
15 * __mips_set_bit - Atomically set a bit in memory. This is called by
16 * set_bit() if it cannot find a faster solution.
17 * @nr: the bit to set
18 * @addr: the address to start counting from
19 */
20void __mips_set_bit(unsigned long nr, volatile unsigned long *addr)
21{
David Daney30189652013-02-26 22:22:33 +0000[diff] [blame]22 unsigned long *a = (unsigned long *)addr;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]23 unsigned bit = nr & SZLONG_MASK;
24 unsigned long mask;
25 unsigned long flags;
26
27 a += nr >> SZLONG_LOG;
28 mask = 1UL << bit;
29 raw_local_irq_save(flags);
30 *a |= mask;
31 raw_local_irq_restore(flags);
32}
33EXPORT_SYMBOL(__mips_set_bit);
34
35
36/**
37 * __mips_clear_bit - Clears a bit in memory. This is called by clear_bit() if
38 * it cannot find a faster solution.
39 * @nr: Bit to clear
40 * @addr: Address to start counting from
41 */
42void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr)
43{
David Daney30189652013-02-26 22:22:33 +0000[diff] [blame]44 unsigned long *a = (unsigned long *)addr;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]45 unsigned bit = nr & SZLONG_MASK;
46 unsigned long mask;
47 unsigned long flags;
48
49 a += nr >> SZLONG_LOG;
50 mask = 1UL << bit;
51 raw_local_irq_save(flags);
52 *a &= ~mask;
53 raw_local_irq_restore(flags);
54}
55EXPORT_SYMBOL(__mips_clear_bit);
56
57
58/**
Ralf Baechle70342282013-01-22 12:59:30 +0100[diff] [blame]59 * __mips_change_bit - Toggle a bit in memory. This is called by change_bit()
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]60 * if it cannot find a faster solution.
61 * @nr: Bit to change
62 * @addr: Address to start counting from
63 */
64void __mips_change_bit(unsigned long nr, volatile unsigned long *addr)
65{
David Daney30189652013-02-26 22:22:33 +0000[diff] [blame]66 unsigned long *a = (unsigned long *)addr;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]67 unsigned bit = nr & SZLONG_MASK;
68 unsigned long mask;
69 unsigned long flags;
70
71 a += nr >> SZLONG_LOG;
72 mask = 1UL << bit;
73 raw_local_irq_save(flags);
74 *a ^= mask;
75 raw_local_irq_restore(flags);
76}
77EXPORT_SYMBOL(__mips_change_bit);
78
79
80/**
81 * __mips_test_and_set_bit - Set a bit and return its old value. This is
82 * called by test_and_set_bit() if it cannot find a faster solution.
83 * @nr: Bit to set
84 * @addr: Address to count from
85 */
86int __mips_test_and_set_bit(unsigned long nr,
87 volatile unsigned long *addr)
88{
David Daney30189652013-02-26 22:22:33 +0000[diff] [blame]89 unsigned long *a = (unsigned long *)addr;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]90 unsigned bit = nr & SZLONG_MASK;
91 unsigned long mask;
92 unsigned long flags;
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]93 int res;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]94
95 a += nr >> SZLONG_LOG;
96 mask = 1UL << bit;
97 raw_local_irq_save(flags);
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]98 res = (mask & *a) != 0;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]99 *a |= mask;
100 raw_local_irq_restore(flags);
101 return res;
102}
103EXPORT_SYMBOL(__mips_test_and_set_bit);
104
105
106/**
107 * __mips_test_and_set_bit_lock - Set a bit and return its old value. This is
108 * called by test_and_set_bit_lock() if it cannot find a faster solution.
109 * @nr: Bit to set
110 * @addr: Address to count from
111 */
112int __mips_test_and_set_bit_lock(unsigned long nr,
113 volatile unsigned long *addr)
114{
David Daney30189652013-02-26 22:22:33 +0000[diff] [blame]115 unsigned long *a = (unsigned long *)addr;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]116 unsigned bit = nr & SZLONG_MASK;
117 unsigned long mask;
118 unsigned long flags;
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]119 int res;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]120
121 a += nr >> SZLONG_LOG;
122 mask = 1UL << bit;
123 raw_local_irq_save(flags);
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]124 res = (mask & *a) != 0;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]125 *a |= mask;
126 raw_local_irq_restore(flags);
127 return res;
128}
129EXPORT_SYMBOL(__mips_test_and_set_bit_lock);
130
131
132/**
133 * __mips_test_and_clear_bit - Clear a bit and return its old value. This is
134 * called by test_and_clear_bit() if it cannot find a faster solution.
135 * @nr: Bit to clear
136 * @addr: Address to count from
137 */
138int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
139{
David Daney30189652013-02-26 22:22:33 +0000[diff] [blame]140 unsigned long *a = (unsigned long *)addr;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]141 unsigned bit = nr & SZLONG_MASK;
142 unsigned long mask;
143 unsigned long flags;
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]144 int res;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]145
146 a += nr >> SZLONG_LOG;
147 mask = 1UL << bit;
148 raw_local_irq_save(flags);
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]149 res = (mask & *a) != 0;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]150 *a &= ~mask;
151 raw_local_irq_restore(flags);
152 return res;
153}
154EXPORT_SYMBOL(__mips_test_and_clear_bit);
155
156
157/**
Ralf Baechle70342282013-01-22 12:59:30 +0100[diff] [blame]158 * __mips_test_and_change_bit - Change a bit and return its old value. This is
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]159 * called by test_and_change_bit() if it cannot find a faster solution.
160 * @nr: Bit to change
161 * @addr: Address to count from
162 */
163int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
164{
David Daney30189652013-02-26 22:22:33 +0000[diff] [blame]165 unsigned long *a = (unsigned long *)addr;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]166 unsigned bit = nr & SZLONG_MASK;
167 unsigned long mask;
168 unsigned long flags;
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]169 int res;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]170
171 a += nr >> SZLONG_LOG;
172 mask = 1UL << bit;
173 raw_local_irq_save(flags);
David Daney0c811572013-02-26 14:35:23 -0800[diff] [blame]174 res = (mask & *a) != 0;
Jim Quinlan92d11592012-09-06 11:36:55 -0400[diff] [blame]175 *a ^= mask;
176 raw_local_irq_restore(flags);
177 return res;
178}
179EXPORT_SYMBOL(__mips_test_and_change_bit);