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92d11594 JQ |
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 | */ | |
20 | void __mips_set_bit(unsigned long nr, volatile unsigned long *addr) | |
21 | { | |
22 | volatile unsigned long *a = 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 | */ | |
42 | void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr) | |
43 | { | |
44 | volatile unsigned long *a = 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 | */ | |
64 | void __mips_change_bit(unsigned long nr, volatile unsigned long *addr) | |
65 | { | |
66 | volatile unsigned long *a = 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 | */ | |
86 | int __mips_test_and_set_bit(unsigned long nr, | |
87 | volatile unsigned long *addr) | |
88 | { | |
89 | volatile unsigned long *a = addr; | |
90 | unsigned bit = nr & SZLONG_MASK; | |
91 | unsigned long mask; | |
92 | unsigned long flags; | |
93 | unsigned long res; | |
94 | ||
95 | a += nr >> SZLONG_LOG; | |
96 | mask = 1UL << bit; | |
97 | raw_local_irq_save(flags); | |
98 | res = (mask & *a); | |
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 | */ | |
112 | int __mips_test_and_set_bit_lock(unsigned long nr, | |
113 | volatile unsigned long *addr) | |
114 | { | |
115 | volatile unsigned long *a = addr; | |
116 | unsigned bit = nr & SZLONG_MASK; | |
117 | unsigned long mask; | |
118 | unsigned long flags; | |
119 | unsigned long res; | |
120 | ||
121 | a += nr >> SZLONG_LOG; | |
122 | mask = 1UL << bit; | |
123 | raw_local_irq_save(flags); | |
124 | res = (mask & *a); | |
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 | */ | |
138 | int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr) | |
139 | { | |
140 | volatile unsigned long *a = addr; | |
141 | unsigned bit = nr & SZLONG_MASK; | |
142 | unsigned long mask; | |
143 | unsigned long flags; | |
144 | unsigned long res; | |
145 | ||
146 | a += nr >> SZLONG_LOG; | |
147 | mask = 1UL << bit; | |
148 | raw_local_irq_save(flags); | |
149 | res = (mask & *a); | |
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 | */ | |
163 | int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr) | |
164 | { | |
165 | volatile unsigned long *a = addr; | |
166 | unsigned bit = nr & SZLONG_MASK; | |
167 | unsigned long mask; | |
168 | unsigned long flags; | |
169 | unsigned long res; | |
170 | ||
171 | a += nr >> SZLONG_LOG; | |
172 | mask = 1UL << bit; | |
173 | raw_local_irq_save(flags); | |
174 | res = (mask & *a); | |
175 | *a ^= mask; | |
176 | raw_local_irq_restore(flags); | |
177 | return res; | |
178 | } | |
179 | EXPORT_SYMBOL(__mips_test_and_change_bit); |