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1da177e4 LT |
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 | ||
0624517d JS |
17 | #ifndef _LINUX_BITOPS_H |
18 | #error only <linux/bitops.h> can be included directly | |
19 | #endif | |
20 | ||
556dcee7 | 21 | #include <arch/bitops.h> |
60063497 | 22 | #include <linux/atomic.h> |
1da177e4 LT |
23 | #include <linux/compiler.h> |
24 | ||
1da177e4 LT |
25 | /* |
26 | * set_bit - Atomically set a bit in memory | |
27 | * @nr: the bit to set | |
28 | * @addr: the address to start counting from | |
29 | * | |
30 | * This function is atomic and may not be reordered. See __set_bit() | |
31 | * if you do not require the atomic guarantees. | |
32 | * Note that @nr may be almost arbitrarily large; this function is not | |
33 | * restricted to acting on a single-word quantity. | |
34 | */ | |
35 | ||
36 | #define set_bit(nr, addr) (void)test_and_set_bit(nr, addr) | |
37 | ||
1da177e4 LT |
38 | /* |
39 | * clear_bit - Clears a bit in memory | |
40 | * @nr: Bit to clear | |
41 | * @addr: Address to start counting from | |
42 | * | |
43 | * clear_bit() is atomic and may not be reordered. However, it does | |
44 | * not contain a memory barrier, so if it is used for locking purposes, | |
45 | * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit() | |
46 | * in order to ensure changes are visible on other processors. | |
47 | */ | |
48 | ||
49 | #define clear_bit(nr, addr) (void)test_and_clear_bit(nr, addr) | |
50 | ||
1da177e4 LT |
51 | /* |
52 | * change_bit - Toggle a bit in memory | |
53 | * @nr: Bit to change | |
54 | * @addr: Address to start counting from | |
55 | * | |
56 | * change_bit() is atomic and may not be reordered. | |
57 | * Note that @nr may be almost arbitrarily large; this function is not | |
58 | * restricted to acting on a single-word quantity. | |
59 | */ | |
60 | ||
61 | #define change_bit(nr, addr) (void)test_and_change_bit(nr, addr) | |
62 | ||
1da177e4 LT |
63 | /** |
64 | * test_and_set_bit - Set a bit and return its old value | |
65 | * @nr: Bit to set | |
66 | * @addr: Address to count from | |
67 | * | |
68 | * This operation is atomic and cannot be reordered. | |
69 | * It also implies a memory barrier. | |
70 | */ | |
71 | ||
d9b5444e | 72 | static inline int test_and_set_bit(int nr, volatile unsigned long *addr) |
1da177e4 LT |
73 | { |
74 | unsigned int mask, retval; | |
75 | unsigned long flags; | |
76 | unsigned int *adr = (unsigned int *)addr; | |
77 | ||
78 | adr += nr >> 5; | |
79 | mask = 1 << (nr & 0x1f); | |
5d01e6ce | 80 | cris_atomic_save(addr, flags); |
1da177e4 LT |
81 | retval = (mask & *adr) != 0; |
82 | *adr |= mask; | |
5d01e6ce | 83 | cris_atomic_restore(addr, flags); |
1da177e4 LT |
84 | return retval; |
85 | } | |
86 | ||
1da177e4 LT |
87 | /* |
88 | * clear_bit() doesn't provide any barrier for the compiler. | |
89 | */ | |
90 | #define smp_mb__before_clear_bit() barrier() | |
91 | #define smp_mb__after_clear_bit() barrier() | |
92 | ||
93 | /** | |
94 | * test_and_clear_bit - Clear a bit and return its old value | |
95 | * @nr: Bit to clear | |
96 | * @addr: Address to count from | |
97 | * | |
98 | * This operation is atomic and cannot be reordered. | |
99 | * It also implies a memory barrier. | |
100 | */ | |
101 | ||
d9b5444e | 102 | static inline int test_and_clear_bit(int nr, volatile unsigned long *addr) |
1da177e4 LT |
103 | { |
104 | unsigned int mask, retval; | |
105 | unsigned long flags; | |
106 | unsigned int *adr = (unsigned int *)addr; | |
107 | ||
108 | adr += nr >> 5; | |
109 | mask = 1 << (nr & 0x1f); | |
5d01e6ce | 110 | cris_atomic_save(addr, flags); |
1da177e4 LT |
111 | retval = (mask & *adr) != 0; |
112 | *adr &= ~mask; | |
5d01e6ce | 113 | cris_atomic_restore(addr, flags); |
1da177e4 LT |
114 | return retval; |
115 | } | |
116 | ||
1da177e4 LT |
117 | /** |
118 | * test_and_change_bit - Change a bit and return its old value | |
119 | * @nr: Bit to change | |
120 | * @addr: Address to count from | |
121 | * | |
122 | * This operation is atomic and cannot be reordered. | |
123 | * It also implies a memory barrier. | |
124 | */ | |
125 | ||
d9b5444e | 126 | static inline int test_and_change_bit(int nr, volatile unsigned long *addr) |
1da177e4 LT |
127 | { |
128 | unsigned int mask, retval; | |
129 | unsigned long flags; | |
130 | unsigned int *adr = (unsigned int *)addr; | |
131 | adr += nr >> 5; | |
132 | mask = 1 << (nr & 0x1f); | |
5d01e6ce | 133 | cris_atomic_save(addr, flags); |
1da177e4 LT |
134 | retval = (mask & *adr) != 0; |
135 | *adr ^= mask; | |
5d01e6ce | 136 | cris_atomic_restore(addr, flags); |
1da177e4 LT |
137 | return retval; |
138 | } | |
139 | ||
e9f26df1 | 140 | #include <asm-generic/bitops/non-atomic.h> |
1da177e4 LT |
141 | |
142 | /* | |
143 | * Since we define it "external", it collides with the built-in | |
144 | * definition, which doesn't have the same semantics. We don't want to | |
145 | * use -fno-builtin, so just hide the name ffs. | |
146 | */ | |
0eb808eb | 147 | #define ffs(x) kernel_ffs(x) |
1da177e4 | 148 | |
e9f26df1 | 149 | #include <asm-generic/bitops/fls.h> |
0999769e | 150 | #include <asm-generic/bitops/__fls.h> |
e9f26df1 AM |
151 | #include <asm-generic/bitops/fls64.h> |
152 | #include <asm-generic/bitops/hweight.h> | |
153 | #include <asm-generic/bitops/find.h> | |
26333576 | 154 | #include <asm-generic/bitops/lock.h> |
1da177e4 | 155 | |
861b5ae7 | 156 | #include <asm-generic/bitops/le.h> |
1da177e4 | 157 | |
148817ba | 158 | #include <asm-generic/bitops/ext2-atomic-setbit.h> |
1da177e4 | 159 | |
e9f26df1 | 160 | #include <asm-generic/bitops/sched.h> |
1da177e4 LT |
161 | |
162 | #endif /* __KERNEL__ */ | |
163 | ||
164 | #endif /* _CRIS_BITOPS_H */ |