1 /* asm/bitops.h for Linux/CRIS
2 *
3 * TODO: asm versions if speed is needed
4 *
5 * All bit operations return 0 if the bit was cleared before the
6 * operation and != 0 if it was not.
7 *
8 * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
9 */
10
11 #ifndef _CRIS_BITOPS_H
12 #define _CRIS_BITOPS_H
13
14 /* Currently this is unsuitable for consumption outside the kernel. */
15 #ifdef __KERNEL__
16
17 #ifndef _LINUX_BITOPS_H
18 #error only <linux/bitops.h> can be included directly
19 #endif
20
21 #include <arch/bitops.h>
22 #include <asm/system.h>
23 #include <linux/atomic.h>
24 #include <linux/compiler.h>
25
26 /*
27 * set_bit - Atomically set a bit in memory
28 * @nr: the bit to set
29 * @addr: the address to start counting from
30 *
31 * This function is atomic and may not be reordered. See __set_bit()
32 * if you do not require the atomic guarantees.
33 * Note that @nr may be almost arbitrarily large; this function is not
34 * restricted to acting on a single-word quantity.
35 */
36
37 #define set_bit(nr, addr) (void)test_and_set_bit(nr, addr)
38
39 /*
40 * clear_bit - Clears a bit in memory
41 * @nr: Bit to clear
42 * @addr: Address to start counting from
43 *
44 * clear_bit() is atomic and may not be reordered. However, it does
45 * not contain a memory barrier, so if it is used for locking purposes,
46 * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
47 * in order to ensure changes are visible on other processors.
48 */
49
50 #define clear_bit(nr, addr) (void)test_and_clear_bit(nr, addr)
51
52 /*
53 * change_bit - Toggle a bit in memory
54 * @nr: Bit to change
55 * @addr: Address to start counting from
56 *
57 * change_bit() is atomic and may not be reordered.
58 * Note that @nr may be almost arbitrarily large; this function is not
59 * restricted to acting on a single-word quantity.
60 */
61
62 #define change_bit(nr, addr) (void)test_and_change_bit(nr, addr)
63
64 /**
65 * test_and_set_bit - Set a bit and return its old value
66 * @nr: Bit to set
67 * @addr: Address to count from
68 *
69 * This operation is atomic and cannot be reordered.
70 * It also implies a memory barrier.
71 */
72
test_and_set_bit(int nr,volatile unsigned long * addr)73 static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
74 {
75 unsigned int mask, retval;
76 unsigned long flags;
77 unsigned int *adr = (unsigned int *)addr;
78
79 adr += nr >> 5;
80 mask = 1 << (nr & 0x1f);
81 cris_atomic_save(addr, flags);
82 retval = (mask & *adr) != 0;
83 *adr |= mask;
84 cris_atomic_restore(addr, flags);
85 return retval;
86 }
87
88 /*
89 * clear_bit() doesn't provide any barrier for the compiler.
90 */
91 #define smp_mb__before_clear_bit() barrier()
92 #define smp_mb__after_clear_bit() barrier()
93
94 /**
95 * test_and_clear_bit - Clear a bit and return its old value
96 * @nr: Bit to clear
97 * @addr: Address to count from
98 *
99 * This operation is atomic and cannot be reordered.
100 * It also implies a memory barrier.
101 */
102
test_and_clear_bit(int nr,volatile unsigned long * addr)103 static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
104 {
105 unsigned int mask, retval;
106 unsigned long flags;
107 unsigned int *adr = (unsigned int *)addr;
108
109 adr += nr >> 5;
110 mask = 1 << (nr & 0x1f);
111 cris_atomic_save(addr, flags);
112 retval = (mask & *adr) != 0;
113 *adr &= ~mask;
114 cris_atomic_restore(addr, flags);
115 return retval;
116 }
117
118 /**
119 * test_and_change_bit - Change a bit and return its old value
120 * @nr: Bit to change
121 * @addr: Address to count from
122 *
123 * This operation is atomic and cannot be reordered.
124 * It also implies a memory barrier.
125 */
126
test_and_change_bit(int nr,volatile unsigned long * addr)127 static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
128 {
129 unsigned int mask, retval;
130 unsigned long flags;
131 unsigned int *adr = (unsigned int *)addr;
132 adr += nr >> 5;
133 mask = 1 << (nr & 0x1f);
134 cris_atomic_save(addr, flags);
135 retval = (mask & *adr) != 0;
136 *adr ^= mask;
137 cris_atomic_restore(addr, flags);
138 return retval;
139 }
140
141 #include <asm-generic/bitops/non-atomic.h>
142
143 /*
144 * Since we define it "external", it collides with the built-in
145 * definition, which doesn't have the same semantics. We don't want to
146 * use -fno-builtin, so just hide the name ffs.
147 */
148 #define ffs kernel_ffs
149
150 #include <asm-generic/bitops/fls.h>
151 #include <asm-generic/bitops/__fls.h>
152 #include <asm-generic/bitops/fls64.h>
153 #include <asm-generic/bitops/hweight.h>
154 #include <asm-generic/bitops/find.h>
155 #include <asm-generic/bitops/lock.h>
156
157 #include <asm-generic/bitops/le.h>
158
159 #include <asm-generic/bitops/ext2-atomic-setbit.h>
160
161 #include <asm-generic/bitops/sched.h>
162
163 #endif /* __KERNEL__ */
164
165 #endif /* _CRIS_BITOPS_H */
166