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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> |
1da177e4 | 22 | #include <asm/system.h> |
5d01e6ce | 23 | #include <asm/atomic.h> |
1da177e4 LT |
24 | #include <linux/compiler.h> |
25 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
d9b5444e | 73 | static inline int test_and_set_bit(int nr, volatile unsigned long *addr) |
1da177e4 LT |
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); | |
5d01e6ce | 81 | cris_atomic_save(addr, flags); |
1da177e4 LT |
82 | retval = (mask & *adr) != 0; |
83 | *adr |= mask; | |
5d01e6ce | 84 | cris_atomic_restore(addr, flags); |
1da177e4 LT |
85 | return retval; |
86 | } | |
87 | ||
1da177e4 LT |
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 | ||
d9b5444e | 103 | static inline int test_and_clear_bit(int nr, volatile unsigned long *addr) |
1da177e4 LT |
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); | |
5d01e6ce | 111 | cris_atomic_save(addr, flags); |
1da177e4 LT |
112 | retval = (mask & *adr) != 0; |
113 | *adr &= ~mask; | |
5d01e6ce | 114 | cris_atomic_restore(addr, flags); |
1da177e4 LT |
115 | return retval; |
116 | } | |
117 | ||
1da177e4 LT |
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 | ||
d9b5444e | 127 | static inline int test_and_change_bit(int nr, volatile unsigned long *addr) |
1da177e4 LT |
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); | |
5d01e6ce | 134 | cris_atomic_save(addr, flags); |
1da177e4 LT |
135 | retval = (mask & *adr) != 0; |
136 | *adr ^= mask; | |
5d01e6ce | 137 | cris_atomic_restore(addr, flags); |
1da177e4 LT |
138 | return retval; |
139 | } | |
140 | ||
e9f26df1 | 141 | #include <asm-generic/bitops/non-atomic.h> |
1da177e4 LT |
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 | ||
e9f26df1 | 150 | #include <asm-generic/bitops/fls.h> |
0999769e | 151 | #include <asm-generic/bitops/__fls.h> |
e9f26df1 AM |
152 | #include <asm-generic/bitops/fls64.h> |
153 | #include <asm-generic/bitops/hweight.h> | |
154 | #include <asm-generic/bitops/find.h> | |
26333576 | 155 | #include <asm-generic/bitops/lock.h> |
1da177e4 | 156 | |
e9f26df1 | 157 | #include <asm-generic/bitops/ext2-non-atomic.h> |
1da177e4 | 158 | |
1da177e4 | 159 | #define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a) |
1da177e4 | 160 | #define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a) |
1da177e4 | 161 | |
e9f26df1 AM |
162 | #include <asm-generic/bitops/minix.h> |
163 | #include <asm-generic/bitops/sched.h> | |
1da177e4 LT |
164 | |
165 | #endif /* __KERNEL__ */ | |
166 | ||
167 | #endif /* _CRIS_BITOPS_H */ |