aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/lib/bitops.c
blob: 3b2a1e78a54369fc43bf052288f3fc7acaac5ae4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 1994-1997, 99, 2000, 06, 07 Ralf Baechle (ralf@linux-mips.org)
 * Copyright (c) 1999, 2000  Silicon Graphics, Inc.
 */
#include <linux/bitops.h>
#include <linux/irqflags.h>
#include <linux/export.h>


/**
 * __mips_set_bit - Atomically set a bit in memory.  This is called by
 * set_bit() if it cannot find a faster solution.
 * @nr: the bit to set
 * @addr: the address to start counting from
 */
void __mips_set_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *a = (unsigned long *)addr;
	unsigned bit = nr & SZLONG_MASK;
	unsigned long mask;
	unsigned long flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << bit;
	raw_local_irq_save(flags);
	*a |= mask;
	raw_local_irq_restore(flags);
}
EXPORT_SYMBOL(__mips_set_bit);


/**
 * __mips_clear_bit - Clears a bit in memory.  This is called by clear_bit() if
 * it cannot find a faster solution.
 * @nr: Bit to clear
 * @addr: Address to start counting from
 */
void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *a = (unsigned long *)addr;
	unsigned bit = nr & SZLONG_MASK;
	unsigned long mask;
	unsigned long flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << bit;
	raw_local_irq_save(flags);
	*a &= ~mask;
	raw_local_irq_restore(flags);
}
EXPORT_SYMBOL(__mips_clear_bit);


/**
 * __mips_change_bit - Toggle a bit in memory.	This is called by change_bit()
 * if it cannot find a faster solution.
 * @nr: Bit to change
 * @addr: Address to start counting from
 */
void __mips_change_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *a = (unsigned long *)addr;
	unsigned bit = nr & SZLONG_MASK;
	unsigned long mask;
	unsigned long flags;

	a += nr >> SZLONG_LOG;
	mask = 1UL << bit;
	raw_local_irq_save(flags);
	*a ^= mask;
	raw_local_irq_restore(flags);
}
EXPORT_SYMBOL(__mips_change_bit);


/**
 * __mips_test_and_set_bit - Set a bit and return its old value.  This is
 * called by test_and_set_bit() if it cannot find a faster solution.
 * @nr: Bit to set
 * @addr: Address to count from
 */
int __mips_test_and_set_bit(unsigned long nr,
			    volatile unsigned long *addr)
{
	unsigned long *a = (unsigned long *)addr;
	unsigned bit = nr & SZLONG_MASK;
	unsigned long mask;
	unsigned long flags;
	int res;

	a += nr >> SZLONG_LOG;
	mask = 1UL << bit;
	raw_local_irq_save(flags);
	res = (mask & *a) != 0;
	*a |= mask;
	raw_local_irq_restore(flags);
	return res;
}
EXPORT_SYMBOL(__mips_test_and_set_bit);


/**
 * __mips_test_and_set_bit_lock - Set a bit and return its old value.  This is
 * called by test_and_set_bit_lock() if it cannot find a faster solution.
 * @nr: Bit to set
 * @addr: Address to count from
 */
int __mips_test_and_set_bit_lock(unsigned long nr,
				 volatile unsigned long *addr)
{
	unsigned long *a = (unsigned long *)addr;
	unsigned bit = nr & SZLONG_MASK;
	unsigned long mask;
	unsigned long flags;
	int res;

	a += nr >> SZLONG_LOG;
	mask = 1UL << bit;
	raw_local_irq_save(flags);
	res = (mask & *a) != 0;
	*a |= mask;
	raw_local_irq_restore(flags);
	return res;
}
EXPORT_SYMBOL(__mips_test_and_set_bit_lock);


/**
 * __mips_test_and_clear_bit - Clear a bit and return its old value.  This is
 * called by test_and_clear_bit() if it cannot find a faster solution.
 * @nr: Bit to clear
 * @addr: Address to count from
 */
int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *a = (unsigned long *)addr;
	unsigned bit = nr & SZLONG_MASK;
	unsigned long mask;
	unsigned long flags;
	int res;

	a += nr >> SZLONG_LOG;
	mask = 1UL << bit;
	raw_local_irq_save(flags);
	res = (mask & *a) != 0;
	*a &= ~mask;
	raw_local_irq_restore(flags);
	return res;
}
EXPORT_SYMBOL(__mips_test_and_clear_bit);


/**
 * __mips_test_and_change_bit - Change a bit and return its old value.	This is
 * called by test_and_change_bit() if it cannot find a faster solution.
 * @nr: Bit to change
 * @addr: Address to count from
 */
int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
{
	unsigned long *a = (unsigned long *)addr;
	unsigned bit = nr & SZLONG_MASK;
	unsigned long mask;
	unsigned long flags;
	int res;

	a += nr >> SZLONG_LOG;
	mask = 1UL << bit;
	raw_local_irq_save(flags);
	res = (mask & *a) != 0;
	*a ^= mask;
	raw_local_irq_restore(flags);
	return res;
}
EXPORT_SYMBOL(__mips_test_and_change_bit);