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1da177e4 LT |
1 | /* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */ |
2 | ||
3 | #ifndef __ASM_CRIS_ATOMIC__ | |
4 | #define __ASM_CRIS_ATOMIC__ | |
5 | ||
9587997a | 6 | #include <linux/compiler.h> |
ea435467 | 7 | #include <linux/types.h> |
1da177e4 | 8 | #include <asm/system.h> |
556dcee7 | 9 | #include <arch/atomic.h> |
1da177e4 LT |
10 | |
11 | /* | |
12 | * Atomic operations that C can't guarantee us. Useful for | |
13 | * resource counting etc.. | |
14 | */ | |
15 | ||
1da177e4 LT |
16 | #define ATOMIC_INIT(i) { (i) } |
17 | ||
f3d46f9d | 18 | #define atomic_read(v) (*(volatile int *)&(v)->counter) |
1da177e4 LT |
19 | #define atomic_set(v,i) (((v)->counter) = (i)) |
20 | ||
21 | /* These should be written in asm but we do it in C for now. */ | |
22 | ||
d9b5444e | 23 | static inline void atomic_add(int i, volatile atomic_t *v) |
1da177e4 LT |
24 | { |
25 | unsigned long flags; | |
8d20a541 | 26 | cris_atomic_save(v, flags); |
1da177e4 | 27 | v->counter += i; |
8d20a541 | 28 | cris_atomic_restore(v, flags); |
1da177e4 LT |
29 | } |
30 | ||
d9b5444e | 31 | static inline void atomic_sub(int i, volatile atomic_t *v) |
1da177e4 LT |
32 | { |
33 | unsigned long flags; | |
8d20a541 | 34 | cris_atomic_save(v, flags); |
1da177e4 | 35 | v->counter -= i; |
8d20a541 | 36 | cris_atomic_restore(v, flags); |
1da177e4 LT |
37 | } |
38 | ||
d9b5444e | 39 | static inline int atomic_add_return(int i, volatile atomic_t *v) |
1da177e4 LT |
40 | { |
41 | unsigned long flags; | |
42 | int retval; | |
8d20a541 | 43 | cris_atomic_save(v, flags); |
1da177e4 | 44 | retval = (v->counter += i); |
8d20a541 | 45 | cris_atomic_restore(v, flags); |
1da177e4 LT |
46 | return retval; |
47 | } | |
48 | ||
49 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) | |
50 | ||
d9b5444e | 51 | static inline int atomic_sub_return(int i, volatile atomic_t *v) |
1da177e4 LT |
52 | { |
53 | unsigned long flags; | |
54 | int retval; | |
8d20a541 | 55 | cris_atomic_save(v, flags); |
1da177e4 | 56 | retval = (v->counter -= i); |
8d20a541 | 57 | cris_atomic_restore(v, flags); |
1da177e4 LT |
58 | return retval; |
59 | } | |
60 | ||
d9b5444e | 61 | static inline int atomic_sub_and_test(int i, volatile atomic_t *v) |
1da177e4 LT |
62 | { |
63 | int retval; | |
64 | unsigned long flags; | |
8d20a541 | 65 | cris_atomic_save(v, flags); |
1da177e4 | 66 | retval = (v->counter -= i) == 0; |
8d20a541 | 67 | cris_atomic_restore(v, flags); |
1da177e4 LT |
68 | return retval; |
69 | } | |
70 | ||
d9b5444e | 71 | static inline void atomic_inc(volatile atomic_t *v) |
1da177e4 LT |
72 | { |
73 | unsigned long flags; | |
8d20a541 | 74 | cris_atomic_save(v, flags); |
1da177e4 | 75 | (v->counter)++; |
8d20a541 | 76 | cris_atomic_restore(v, flags); |
1da177e4 LT |
77 | } |
78 | ||
d9b5444e | 79 | static inline void atomic_dec(volatile atomic_t *v) |
1da177e4 LT |
80 | { |
81 | unsigned long flags; | |
8d20a541 | 82 | cris_atomic_save(v, flags); |
1da177e4 | 83 | (v->counter)--; |
8d20a541 | 84 | cris_atomic_restore(v, flags); |
1da177e4 LT |
85 | } |
86 | ||
d9b5444e | 87 | static inline int atomic_inc_return(volatile atomic_t *v) |
1da177e4 LT |
88 | { |
89 | unsigned long flags; | |
90 | int retval; | |
8d20a541 | 91 | cris_atomic_save(v, flags); |
3c1d9303 | 92 | retval = ++(v->counter); |
8d20a541 | 93 | cris_atomic_restore(v, flags); |
1da177e4 LT |
94 | return retval; |
95 | } | |
96 | ||
d9b5444e | 97 | static inline int atomic_dec_return(volatile atomic_t *v) |
1da177e4 LT |
98 | { |
99 | unsigned long flags; | |
100 | int retval; | |
8d20a541 | 101 | cris_atomic_save(v, flags); |
3c1d9303 | 102 | retval = --(v->counter); |
8d20a541 | 103 | cris_atomic_restore(v, flags); |
1da177e4 LT |
104 | return retval; |
105 | } | |
d9b5444e | 106 | static inline int atomic_dec_and_test(volatile atomic_t *v) |
1da177e4 LT |
107 | { |
108 | int retval; | |
109 | unsigned long flags; | |
8d20a541 | 110 | cris_atomic_save(v, flags); |
1da177e4 | 111 | retval = --(v->counter) == 0; |
8d20a541 | 112 | cris_atomic_restore(v, flags); |
1da177e4 LT |
113 | return retval; |
114 | } | |
115 | ||
d9b5444e | 116 | static inline int atomic_inc_and_test(volatile atomic_t *v) |
1da177e4 LT |
117 | { |
118 | int retval; | |
119 | unsigned long flags; | |
8d20a541 | 120 | cris_atomic_save(v, flags); |
1da177e4 | 121 | retval = ++(v->counter) == 0; |
8d20a541 | 122 | cris_atomic_restore(v, flags); |
1da177e4 LT |
123 | return retval; |
124 | } | |
125 | ||
4a6dae6d NP |
126 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
127 | { | |
128 | int ret; | |
129 | unsigned long flags; | |
130 | ||
131 | cris_atomic_save(v, flags); | |
132 | ret = v->counter; | |
133 | if (likely(ret == old)) | |
134 | v->counter = new; | |
135 | cris_atomic_restore(v, flags); | |
136 | return ret; | |
137 | } | |
138 | ||
ffbf670f IM |
139 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
140 | ||
8426e1f6 NP |
141 | static inline int atomic_add_unless(atomic_t *v, int a, int u) |
142 | { | |
143 | int ret; | |
144 | unsigned long flags; | |
145 | ||
146 | cris_atomic_save(v, flags); | |
147 | ret = v->counter; | |
148 | if (ret != u) | |
149 | v->counter += a; | |
150 | cris_atomic_restore(v, flags); | |
151 | return ret != u; | |
152 | } | |
153 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
154 | ||
1da177e4 LT |
155 | /* Atomic operations are already serializing */ |
156 | #define smp_mb__before_atomic_dec() barrier() | |
157 | #define smp_mb__after_atomic_dec() barrier() | |
158 | #define smp_mb__before_atomic_inc() barrier() | |
159 | #define smp_mb__after_atomic_inc() barrier() | |
160 | ||
72099ed2 | 161 | #include <asm-generic/atomic-long.h> |
1da177e4 | 162 | #endif |