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 */
__mips_set_bit(unsigned long nr,volatile unsigned long * addr)20 void __mips_set_bit(unsigned long nr, volatile unsigned long *addr)
21 {
22 unsigned long *a = (unsigned long *)addr;
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 }
33 EXPORT_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 */
__mips_clear_bit(unsigned long nr,volatile unsigned long * addr)42 void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr)
43 {
44 unsigned long *a = (unsigned long *)addr;
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 }
55 EXPORT_SYMBOL(__mips_clear_bit);
56
57
58 /**
59 * __mips_change_bit - Toggle a bit in memory. This is called by change_bit()
60 * if it cannot find a faster solution.
61 * @nr: Bit to change
62 * @addr: Address to start counting from
63 */
__mips_change_bit(unsigned long nr,volatile unsigned long * addr)64 void __mips_change_bit(unsigned long nr, volatile unsigned long *addr)
65 {
66 unsigned long *a = (unsigned long *)addr;
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 }
77 EXPORT_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 */
__mips_test_and_set_bit(unsigned long nr,volatile unsigned long * addr)86 int __mips_test_and_set_bit(unsigned long nr,
87 volatile unsigned long *addr)
88 {
89 unsigned long *a = (unsigned long *)addr;
90 unsigned bit = nr & SZLONG_MASK;
91 unsigned long mask;
92 unsigned long flags;
93 int res;
94
95 a += nr >> SZLONG_LOG;
96 mask = 1UL << bit;
97 raw_local_irq_save(flags);
98 res = (mask & *a) != 0;
99 *a |= mask;
100 raw_local_irq_restore(flags);
101 return res;
102 }
103 EXPORT_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 */
__mips_test_and_set_bit_lock(unsigned long nr,volatile unsigned long * addr)112 int __mips_test_and_set_bit_lock(unsigned long nr,
113 volatile unsigned long *addr)
114 {
115 unsigned long *a = (unsigned long *)addr;
116 unsigned bit = nr & SZLONG_MASK;
117 unsigned long mask;
118 unsigned long flags;
119 int res;
120
121 a += nr >> SZLONG_LOG;
122 mask = 1UL << bit;
123 raw_local_irq_save(flags);
124 res = (mask & *a) != 0;
125 *a |= mask;
126 raw_local_irq_restore(flags);
127 return res;
128 }
129 EXPORT_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 */
__mips_test_and_clear_bit(unsigned long nr,volatile unsigned long * addr)138 int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
139 {
140 unsigned long *a = (unsigned long *)addr;
141 unsigned bit = nr & SZLONG_MASK;
142 unsigned long mask;
143 unsigned long flags;
144 int res;
145
146 a += nr >> SZLONG_LOG;
147 mask = 1UL << bit;
148 raw_local_irq_save(flags);
149 res = (mask & *a) != 0;
150 *a &= ~mask;
151 raw_local_irq_restore(flags);
152 return res;
153 }
154 EXPORT_SYMBOL(__mips_test_and_clear_bit);
155
156
157 /**
158 * __mips_test_and_change_bit - Change a bit and return its old value. This is
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 */
__mips_test_and_change_bit(unsigned long nr,volatile unsigned long * addr)163 int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
164 {
165 unsigned long *a = (unsigned long *)addr;
166 unsigned bit = nr & SZLONG_MASK;
167 unsigned long mask;
168 unsigned long flags;
169 int res;
170
171 a += nr >> SZLONG_LOG;
172 mask = 1UL << bit;
173 raw_local_irq_save(flags);
174 res = (mask & *a) != 0;
175 *a ^= mask;
176 raw_local_irq_restore(flags);
177 return res;
178 }
179 EXPORT_SYMBOL(__mips_test_and_change_bit);
180