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1da177e4 LT |
1 | /* |
2 | * include/asm-v850/atomic.h -- Atomic operations | |
3 | * | |
4 | * Copyright (C) 2001,02 NEC Corporation | |
5 | * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General | |
8 | * Public License. See the file COPYING in the main directory of this | |
9 | * archive for more details. | |
10 | * | |
11 | * Written by Miles Bader <miles@gnu.org> | |
12 | */ | |
13 | ||
14 | #ifndef __V850_ATOMIC_H__ | |
15 | #define __V850_ATOMIC_H__ | |
16 | ||
1da177e4 LT |
17 | |
18 | #include <asm/system.h> | |
19 | ||
20 | #ifdef CONFIG_SMP | |
21 | #error SMP not supported | |
22 | #endif | |
23 | ||
24 | typedef struct { int counter; } atomic_t; | |
25 | ||
26 | #define ATOMIC_INIT(i) { (i) } | |
27 | ||
28 | #ifdef __KERNEL__ | |
29 | ||
30 | #define atomic_read(v) ((v)->counter) | |
31 | #define atomic_set(v,i) (((v)->counter) = (i)) | |
32 | ||
23f88fe4 | 33 | static inline int atomic_add_return (int i, volatile atomic_t *v) |
1da177e4 LT |
34 | { |
35 | unsigned long flags; | |
36 | int res; | |
37 | ||
38 | local_irq_save (flags); | |
39 | res = v->counter + i; | |
40 | v->counter = res; | |
41 | local_irq_restore (flags); | |
42 | ||
43 | return res; | |
44 | } | |
45 | ||
46 | static __inline__ int atomic_sub_return (int i, volatile atomic_t *v) | |
47 | { | |
48 | unsigned long flags; | |
49 | int res; | |
50 | ||
51 | local_irq_save (flags); | |
52 | res = v->counter - i; | |
53 | v->counter = res; | |
54 | local_irq_restore (flags); | |
55 | ||
56 | return res; | |
57 | } | |
58 | ||
59 | static __inline__ void atomic_clear_mask (unsigned long mask, unsigned long *addr) | |
60 | { | |
61 | unsigned long flags; | |
62 | ||
63 | local_irq_save (flags); | |
64 | *addr &= ~mask; | |
65 | local_irq_restore (flags); | |
66 | } | |
67 | ||
68 | #endif | |
69 | ||
70 | #define atomic_add(i, v) atomic_add_return ((i), (v)) | |
71 | #define atomic_sub(i, v) atomic_sub_return ((i), (v)) | |
72 | ||
73 | #define atomic_dec_return(v) atomic_sub_return (1, (v)) | |
74 | #define atomic_inc_return(v) atomic_add_return (1, (v)) | |
75 | #define atomic_inc(v) atomic_inc_return (v) | |
76 | #define atomic_dec(v) atomic_dec_return (v) | |
77 | ||
78 | /* | |
79 | * atomic_inc_and_test - increment and test | |
80 | * @v: pointer of type atomic_t | |
81 | * | |
82 | * Atomically increments @v by 1 | |
83 | * and returns true if the result is zero, or false for all | |
84 | * other cases. | |
85 | */ | |
86 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
87 | ||
88 | #define atomic_sub_and_test(i,v) (atomic_sub_return ((i), (v)) == 0) | |
89 | #define atomic_dec_and_test(v) (atomic_sub_return (1, (v)) == 0) | |
90 | #define atomic_add_negative(i,v) (atomic_add_return ((i), (v)) < 0) | |
91 | ||
4a6dae6d NP |
92 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
93 | { | |
94 | int ret; | |
95 | unsigned long flags; | |
96 | ||
97 | local_irq_save(flags); | |
98 | ret = v->counter; | |
99 | if (likely(ret == old)) | |
100 | v->counter = new; | |
101 | local_irq_restore(flags); | |
102 | ||
103 | return ret; | |
104 | } | |
105 | ||
ffbf670f IM |
106 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
107 | ||
8426e1f6 NP |
108 | static inline int atomic_add_unless(atomic_t *v, int a, int u) |
109 | { | |
110 | int ret; | |
111 | unsigned long flags; | |
112 | ||
113 | local_irq_save(flags); | |
114 | ret = v->counter; | |
115 | if (ret != u) | |
116 | v->counter += a; | |
117 | local_irq_restore(flags); | |
118 | ||
119 | return ret != u; | |
120 | } | |
121 | ||
122 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
123 | ||
1da177e4 LT |
124 | /* Atomic operations are already serializing on ARM */ |
125 | #define smp_mb__before_atomic_dec() barrier() | |
126 | #define smp_mb__after_atomic_dec() barrier() | |
127 | #define smp_mb__before_atomic_inc() barrier() | |
128 | #define smp_mb__after_atomic_inc() barrier() | |
129 | ||
d3cb4871 | 130 | #include <asm-generic/atomic.h> |
1da177e4 | 131 | #endif /* __V850_ATOMIC_H__ */ |