1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
3*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive
4*4882a593Smuzhiyun * for more details.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (c) 1994-1997, 99, 2000, 06, 07 Ralf Baechle (ralf@linux-mips.org)
7*4882a593Smuzhiyun * Copyright (c) 1999, 2000 Silicon Graphics, Inc.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun #include <linux/bitops.h>
10*4882a593Smuzhiyun #include <linux/bits.h>
11*4882a593Smuzhiyun #include <linux/irqflags.h>
12*4882a593Smuzhiyun #include <linux/export.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun /**
16*4882a593Smuzhiyun * __mips_set_bit - Atomically set a bit in memory. This is called by
17*4882a593Smuzhiyun * set_bit() if it cannot find a faster solution.
18*4882a593Smuzhiyun * @nr: the bit to set
19*4882a593Smuzhiyun * @addr: the address to start counting from
20*4882a593Smuzhiyun */
__mips_set_bit(unsigned long nr,volatile unsigned long * addr)21*4882a593Smuzhiyun void __mips_set_bit(unsigned long nr, volatile unsigned long *addr)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun volatile unsigned long *a = &addr[BIT_WORD(nr)];
24*4882a593Smuzhiyun unsigned int bit = nr % BITS_PER_LONG;
25*4882a593Smuzhiyun unsigned long mask;
26*4882a593Smuzhiyun unsigned long flags;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun mask = 1UL << bit;
29*4882a593Smuzhiyun raw_local_irq_save(flags);
30*4882a593Smuzhiyun *a |= mask;
31*4882a593Smuzhiyun raw_local_irq_restore(flags);
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun EXPORT_SYMBOL(__mips_set_bit);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /**
37*4882a593Smuzhiyun * __mips_clear_bit - Clears a bit in memory. This is called by clear_bit() if
38*4882a593Smuzhiyun * it cannot find a faster solution.
39*4882a593Smuzhiyun * @nr: Bit to clear
40*4882a593Smuzhiyun * @addr: Address to start counting from
41*4882a593Smuzhiyun */
__mips_clear_bit(unsigned long nr,volatile unsigned long * addr)42*4882a593Smuzhiyun void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun volatile unsigned long *a = &addr[BIT_WORD(nr)];
45*4882a593Smuzhiyun unsigned int bit = nr % BITS_PER_LONG;
46*4882a593Smuzhiyun unsigned long mask;
47*4882a593Smuzhiyun unsigned long flags;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun mask = 1UL << bit;
50*4882a593Smuzhiyun raw_local_irq_save(flags);
51*4882a593Smuzhiyun *a &= ~mask;
52*4882a593Smuzhiyun raw_local_irq_restore(flags);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun EXPORT_SYMBOL(__mips_clear_bit);
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun /**
58*4882a593Smuzhiyun * __mips_change_bit - Toggle a bit in memory. This is called by change_bit()
59*4882a593Smuzhiyun * if it cannot find a faster solution.
60*4882a593Smuzhiyun * @nr: Bit to change
61*4882a593Smuzhiyun * @addr: Address to start counting from
62*4882a593Smuzhiyun */
__mips_change_bit(unsigned long nr,volatile unsigned long * addr)63*4882a593Smuzhiyun void __mips_change_bit(unsigned long nr, volatile unsigned long *addr)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun volatile unsigned long *a = &addr[BIT_WORD(nr)];
66*4882a593Smuzhiyun unsigned int bit = nr % BITS_PER_LONG;
67*4882a593Smuzhiyun unsigned long mask;
68*4882a593Smuzhiyun unsigned long flags;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun mask = 1UL << bit;
71*4882a593Smuzhiyun raw_local_irq_save(flags);
72*4882a593Smuzhiyun *a ^= mask;
73*4882a593Smuzhiyun raw_local_irq_restore(flags);
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun EXPORT_SYMBOL(__mips_change_bit);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun /**
79*4882a593Smuzhiyun * __mips_test_and_set_bit_lock - Set a bit and return its old value. This is
80*4882a593Smuzhiyun * called by test_and_set_bit_lock() if it cannot find a faster solution.
81*4882a593Smuzhiyun * @nr: Bit to set
82*4882a593Smuzhiyun * @addr: Address to count from
83*4882a593Smuzhiyun */
__mips_test_and_set_bit_lock(unsigned long nr,volatile unsigned long * addr)84*4882a593Smuzhiyun int __mips_test_and_set_bit_lock(unsigned long nr,
85*4882a593Smuzhiyun volatile unsigned long *addr)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun volatile unsigned long *a = &addr[BIT_WORD(nr)];
88*4882a593Smuzhiyun unsigned int bit = nr % BITS_PER_LONG;
89*4882a593Smuzhiyun unsigned long mask;
90*4882a593Smuzhiyun unsigned long flags;
91*4882a593Smuzhiyun int res;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun mask = 1UL << bit;
94*4882a593Smuzhiyun raw_local_irq_save(flags);
95*4882a593Smuzhiyun res = (mask & *a) != 0;
96*4882a593Smuzhiyun *a |= mask;
97*4882a593Smuzhiyun raw_local_irq_restore(flags);
98*4882a593Smuzhiyun return res;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun EXPORT_SYMBOL(__mips_test_and_set_bit_lock);
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun /**
104*4882a593Smuzhiyun * __mips_test_and_clear_bit - Clear a bit and return its old value. This is
105*4882a593Smuzhiyun * called by test_and_clear_bit() if it cannot find a faster solution.
106*4882a593Smuzhiyun * @nr: Bit to clear
107*4882a593Smuzhiyun * @addr: Address to count from
108*4882a593Smuzhiyun */
__mips_test_and_clear_bit(unsigned long nr,volatile unsigned long * addr)109*4882a593Smuzhiyun int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
110*4882a593Smuzhiyun {
111*4882a593Smuzhiyun volatile unsigned long *a = &addr[BIT_WORD(nr)];
112*4882a593Smuzhiyun unsigned int bit = nr % BITS_PER_LONG;
113*4882a593Smuzhiyun unsigned long mask;
114*4882a593Smuzhiyun unsigned long flags;
115*4882a593Smuzhiyun int res;
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun mask = 1UL << bit;
118*4882a593Smuzhiyun raw_local_irq_save(flags);
119*4882a593Smuzhiyun res = (mask & *a) != 0;
120*4882a593Smuzhiyun *a &= ~mask;
121*4882a593Smuzhiyun raw_local_irq_restore(flags);
122*4882a593Smuzhiyun return res;
123*4882a593Smuzhiyun }
124*4882a593Smuzhiyun EXPORT_SYMBOL(__mips_test_and_clear_bit);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun /**
128*4882a593Smuzhiyun * __mips_test_and_change_bit - Change a bit and return its old value. This is
129*4882a593Smuzhiyun * called by test_and_change_bit() if it cannot find a faster solution.
130*4882a593Smuzhiyun * @nr: Bit to change
131*4882a593Smuzhiyun * @addr: Address to count from
132*4882a593Smuzhiyun */
__mips_test_and_change_bit(unsigned long nr,volatile unsigned long * addr)133*4882a593Smuzhiyun int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
134*4882a593Smuzhiyun {
135*4882a593Smuzhiyun volatile unsigned long *a = &addr[BIT_WORD(nr)];
136*4882a593Smuzhiyun unsigned int bit = nr % BITS_PER_LONG;
137*4882a593Smuzhiyun unsigned long mask;
138*4882a593Smuzhiyun unsigned long flags;
139*4882a593Smuzhiyun int res;
140*4882a593Smuzhiyun
141*4882a593Smuzhiyun mask = 1UL << bit;
142*4882a593Smuzhiyun raw_local_irq_save(flags);
143*4882a593Smuzhiyun res = (mask & *a) != 0;
144*4882a593Smuzhiyun *a ^= mask;
145*4882a593Smuzhiyun raw_local_irq_restore(flags);
146*4882a593Smuzhiyun return res;
147*4882a593Smuzhiyun }
148*4882a593Smuzhiyun EXPORT_SYMBOL(__mips_test_and_change_bit);
149