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[mirror_ubuntu-hirsute-kernel.git] / arch / mips / lib / bitops.c
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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>
c042be02 10#include <linux/bits.h>
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11#include <linux/irqflags.h>
12#include <linux/export.h>
13
14
15/**
16 * __mips_set_bit - Atomically set a bit in memory. This is called by
17 * set_bit() if it cannot find a faster solution.
18 * @nr: the bit to set
19 * @addr: the address to start counting from
20 */
21void __mips_set_bit(unsigned long nr, volatile unsigned long *addr)
22{
c042be02
PB
23 volatile unsigned long *a = &addr[BIT_WORD(nr)];
24 unsigned int bit = nr % BITS_PER_LONG;
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25 unsigned long mask;
26 unsigned long flags;
27
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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{
c042be02
PB
44 volatile unsigned long *a = &addr[BIT_WORD(nr)];
45 unsigned int bit = nr % BITS_PER_LONG;
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46 unsigned long mask;
47 unsigned long flags;
48
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49 mask = 1UL << bit;
50 raw_local_irq_save(flags);
51 *a &= ~mask;
52 raw_local_irq_restore(flags);
53}
54EXPORT_SYMBOL(__mips_clear_bit);
55
56
57/**
70342287 58 * __mips_change_bit - Toggle a bit in memory. This is called by change_bit()
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59 * if it cannot find a faster solution.
60 * @nr: Bit to change
61 * @addr: Address to start counting from
62 */
63void __mips_change_bit(unsigned long nr, volatile unsigned long *addr)
64{
c042be02
PB
65 volatile unsigned long *a = &addr[BIT_WORD(nr)];
66 unsigned int bit = nr % BITS_PER_LONG;
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67 unsigned long mask;
68 unsigned long flags;
69
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70 mask = 1UL << bit;
71 raw_local_irq_save(flags);
72 *a ^= mask;
73 raw_local_irq_restore(flags);
74}
75EXPORT_SYMBOL(__mips_change_bit);
76
77
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78/**
79 * __mips_test_and_set_bit_lock - Set a bit and return its old value. This is
80 * called by test_and_set_bit_lock() if it cannot find a faster solution.
81 * @nr: Bit to set
82 * @addr: Address to count from
83 */
84int __mips_test_and_set_bit_lock(unsigned long nr,
85 volatile unsigned long *addr)
86{
c042be02
PB
87 volatile unsigned long *a = &addr[BIT_WORD(nr)];
88 unsigned int bit = nr % BITS_PER_LONG;
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89 unsigned long mask;
90 unsigned long flags;
0c81157b 91 int res;
92d11594 92
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93 mask = 1UL << bit;
94 raw_local_irq_save(flags);
0c81157b 95 res = (mask & *a) != 0;
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96 *a |= mask;
97 raw_local_irq_restore(flags);
98 return res;
99}
100EXPORT_SYMBOL(__mips_test_and_set_bit_lock);
101
102
103/**
104 * __mips_test_and_clear_bit - Clear a bit and return its old value. This is
105 * called by test_and_clear_bit() if it cannot find a faster solution.
106 * @nr: Bit to clear
107 * @addr: Address to count from
108 */
109int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
110{
c042be02
PB
111 volatile unsigned long *a = &addr[BIT_WORD(nr)];
112 unsigned int bit = nr % BITS_PER_LONG;
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113 unsigned long mask;
114 unsigned long flags;
0c81157b 115 int res;
92d11594 116
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117 mask = 1UL << bit;
118 raw_local_irq_save(flags);
0c81157b 119 res = (mask & *a) != 0;
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120 *a &= ~mask;
121 raw_local_irq_restore(flags);
122 return res;
123}
124EXPORT_SYMBOL(__mips_test_and_clear_bit);
125
126
127/**
70342287 128 * __mips_test_and_change_bit - Change a bit and return its old value. This is
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129 * called by test_and_change_bit() if it cannot find a faster solution.
130 * @nr: Bit to change
131 * @addr: Address to count from
132 */
133int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
134{
c042be02
PB
135 volatile unsigned long *a = &addr[BIT_WORD(nr)];
136 unsigned int bit = nr % BITS_PER_LONG;
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137 unsigned long mask;
138 unsigned long flags;
0c81157b 139 int res;
92d11594 140
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141 mask = 1UL << bit;
142 raw_local_irq_save(flags);
0c81157b 143 res = (mask & *a) != 0;
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144 *a ^= mask;
145 raw_local_irq_restore(flags);
146 return res;
147}
148EXPORT_SYMBOL(__mips_test_and_change_bit);