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{
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}
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{
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}
55EXPORT_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 */
64void __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}
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{
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}
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{
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}
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{
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}
154EXPORT_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 */
163int __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}
179EXPORT_SYMBOL(__mips_test_and_change_bit);
180