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1da177e4 LT |
1 | /* $Id: atomic.h,v 1.22 2001/07/11 23:56:07 davem Exp $ |
2 | * atomic.h: Thankfully the V9 is at least reasonable for this | |
3 | * stuff. | |
4 | * | |
5 | * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com) | |
6 | */ | |
7 | ||
8 | #ifndef __ARCH_SPARC64_ATOMIC__ | |
9 | #define __ARCH_SPARC64_ATOMIC__ | |
10 | ||
1da177e4 | 11 | #include <linux/types.h> |
2856f5e3 | 12 | #include <asm/system.h> |
1da177e4 LT |
13 | |
14 | typedef struct { volatile int counter; } atomic_t; | |
15 | typedef struct { volatile __s64 counter; } atomic64_t; | |
16 | ||
17 | #define ATOMIC_INIT(i) { (i) } | |
18 | #define ATOMIC64_INIT(i) { (i) } | |
19 | ||
20 | #define atomic_read(v) ((v)->counter) | |
21 | #define atomic64_read(v) ((v)->counter) | |
22 | ||
23 | #define atomic_set(v, i) (((v)->counter) = i) | |
24 | #define atomic64_set(v, i) (((v)->counter) = i) | |
25 | ||
26 | extern void atomic_add(int, atomic_t *); | |
27 | extern void atomic64_add(int, atomic64_t *); | |
28 | extern void atomic_sub(int, atomic_t *); | |
29 | extern void atomic64_sub(int, atomic64_t *); | |
30 | ||
31 | extern int atomic_add_ret(int, atomic_t *); | |
32 | extern int atomic64_add_ret(int, atomic64_t *); | |
33 | extern int atomic_sub_ret(int, atomic_t *); | |
34 | extern int atomic64_sub_ret(int, atomic64_t *); | |
35 | ||
36 | #define atomic_dec_return(v) atomic_sub_ret(1, v) | |
37 | #define atomic64_dec_return(v) atomic64_sub_ret(1, v) | |
38 | ||
39 | #define atomic_inc_return(v) atomic_add_ret(1, v) | |
40 | #define atomic64_inc_return(v) atomic64_add_ret(1, v) | |
41 | ||
42 | #define atomic_sub_return(i, v) atomic_sub_ret(i, v) | |
43 | #define atomic64_sub_return(i, v) atomic64_sub_ret(i, v) | |
44 | ||
45 | #define atomic_add_return(i, v) atomic_add_ret(i, v) | |
46 | #define atomic64_add_return(i, v) atomic64_add_ret(i, v) | |
47 | ||
48 | /* | |
49 | * atomic_inc_and_test - increment and test | |
50 | * @v: pointer of type atomic_t | |
51 | * | |
52 | * Atomically increments @v by 1 | |
53 | * and returns true if the result is zero, or false for all | |
54 | * other cases. | |
55 | */ | |
56 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
7c72aaf2 | 57 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
1da177e4 LT |
58 | |
59 | #define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0) | |
60 | #define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0) | |
61 | ||
62 | #define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0) | |
63 | #define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0) | |
64 | ||
65 | #define atomic_inc(v) atomic_add(1, v) | |
66 | #define atomic64_inc(v) atomic64_add(1, v) | |
67 | ||
68 | #define atomic_dec(v) atomic_sub(1, v) | |
69 | #define atomic64_dec(v) atomic64_sub(1, v) | |
70 | ||
71 | #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) | |
72 | #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) | |
73 | ||
2549c858 | 74 | #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) |
ffbf670f | 75 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
4a6dae6d | 76 | |
2856f5e3 MD |
77 | static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) |
78 | { | |
79 | int c, old; | |
80 | c = atomic_read(v); | |
81 | for (;;) { | |
82 | if (unlikely(c == (u))) | |
83 | break; | |
84 | old = atomic_cmpxchg((v), c, c + (a)); | |
85 | if (likely(old == c)) | |
86 | break; | |
87 | c = old; | |
88 | } | |
89 | return c != (u); | |
90 | } | |
91 | ||
8426e1f6 NP |
92 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
93 | ||
2549c858 MD |
94 | #define atomic64_cmpxchg(v, o, n) \ |
95 | ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) | |
96 | #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) | |
97 | ||
2856f5e3 MD |
98 | static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) |
99 | { | |
100 | long c, old; | |
101 | c = atomic64_read(v); | |
102 | for (;;) { | |
103 | if (unlikely(c == (u))) | |
104 | break; | |
105 | old = atomic64_cmpxchg((v), c, c + (a)); | |
106 | if (likely(old == c)) | |
107 | break; | |
108 | c = old; | |
109 | } | |
110 | return c != (u); | |
111 | } | |
112 | ||
2549c858 MD |
113 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
114 | ||
1da177e4 LT |
115 | /* Atomic operations are already serializing */ |
116 | #ifdef CONFIG_SMP | |
4f07118f DM |
117 | #define smp_mb__before_atomic_dec() membar_storeload_loadload(); |
118 | #define smp_mb__after_atomic_dec() membar_storeload_storestore(); | |
119 | #define smp_mb__before_atomic_inc() membar_storeload_loadload(); | |
120 | #define smp_mb__after_atomic_inc() membar_storeload_storestore(); | |
1da177e4 LT |
121 | #else |
122 | #define smp_mb__before_atomic_dec() barrier() | |
123 | #define smp_mb__after_atomic_dec() barrier() | |
124 | #define smp_mb__before_atomic_inc() barrier() | |
125 | #define smp_mb__after_atomic_inc() barrier() | |
126 | #endif | |
127 | ||
d3cb4871 | 128 | #include <asm-generic/atomic.h> |
1da177e4 | 129 | #endif /* !(__ARCH_SPARC64_ATOMIC__) */ |