Commit | Line | Data |
---|---|---|
f5e706ad SR |
1 | /* atomic.h: Thankfully the V9 is at least reasonable for this |
2 | * stuff. | |
3 | * | |
193d2aad | 4 | * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com) |
f5e706ad SR |
5 | */ |
6 | ||
7 | #ifndef __ARCH_SPARC64_ATOMIC__ | |
8 | #define __ARCH_SPARC64_ATOMIC__ | |
9 | ||
10 | #include <linux/types.h> | |
d550bbd4 | 11 | #include <asm/cmpxchg.h> |
56d36489 | 12 | #include <asm/barrier.h> |
f5e706ad | 13 | |
f5e706ad SR |
14 | #define ATOMIC_INIT(i) { (i) } |
15 | #define ATOMIC64_INIT(i) { (i) } | |
16 | ||
62e8a325 PZ |
17 | #define atomic_read(v) READ_ONCE((v)->counter) |
18 | #define atomic64_read(v) READ_ONCE((v)->counter) | |
f5e706ad | 19 | |
62e8a325 PZ |
20 | #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) |
21 | #define atomic64_set(v, i) WRITE_ONCE(((v)->counter), (i)) | |
f5e706ad | 22 | |
4f3316c2 PZ |
23 | #define ATOMIC_OP(op) \ |
24 | void atomic_##op(int, atomic_t *); \ | |
25 | void atomic64_##op(long, atomic64_t *); | |
f5e706ad | 26 | |
4f3316c2 PZ |
27 | #define ATOMIC_OP_RETURN(op) \ |
28 | int atomic_##op##_return(int, atomic_t *); \ | |
29 | long atomic64_##op##_return(long, atomic64_t *); | |
f5e706ad | 30 | |
4f3316c2 | 31 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) |
f5e706ad | 32 | |
4f3316c2 PZ |
33 | ATOMIC_OPS(add) |
34 | ATOMIC_OPS(sub) | |
f5e706ad | 35 | |
304a0d69 PZ |
36 | ATOMIC_OP(and) |
37 | ATOMIC_OP(or) | |
38 | ATOMIC_OP(xor) | |
39 | ||
4f3316c2 PZ |
40 | #undef ATOMIC_OPS |
41 | #undef ATOMIC_OP_RETURN | |
42 | #undef ATOMIC_OP | |
f5e706ad | 43 | |
4f3316c2 PZ |
44 | #define atomic_dec_return(v) atomic_sub_return(1, v) |
45 | #define atomic64_dec_return(v) atomic64_sub_return(1, v) | |
46 | ||
47 | #define atomic_inc_return(v) atomic_add_return(1, v) | |
48 | #define atomic64_inc_return(v) atomic64_add_return(1, v) | |
f5e706ad SR |
49 | |
50 | /* | |
51 | * atomic_inc_and_test - increment and test | |
52 | * @v: pointer of type atomic_t | |
53 | * | |
54 | * Atomically increments @v by 1 | |
55 | * and returns true if the result is zero, or false for all | |
56 | * other cases. | |
57 | */ | |
58 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
59 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) | |
60 | ||
4f3316c2 PZ |
61 | #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) |
62 | #define atomic64_sub_and_test(i, v) (atomic64_sub_return(i, v) == 0) | |
f5e706ad | 63 | |
4f3316c2 PZ |
64 | #define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0) |
65 | #define atomic64_dec_and_test(v) (atomic64_sub_return(1, v) == 0) | |
f5e706ad SR |
66 | |
67 | #define atomic_inc(v) atomic_add(1, v) | |
68 | #define atomic64_inc(v) atomic64_add(1, v) | |
69 | ||
70 | #define atomic_dec(v) atomic_sub(1, v) | |
71 | #define atomic64_dec(v) atomic64_sub(1, v) | |
72 | ||
4f3316c2 PZ |
73 | #define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0) |
74 | #define atomic64_add_negative(i, v) (atomic64_add_return(i, v) < 0) | |
f5e706ad SR |
75 | |
76 | #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) | |
77 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | |
78 | ||
f24219b4 | 79 | static inline int __atomic_add_unless(atomic_t *v, int a, int u) |
f5e706ad SR |
80 | { |
81 | int c, old; | |
82 | c = atomic_read(v); | |
83 | for (;;) { | |
84 | if (unlikely(c == (u))) | |
85 | break; | |
86 | old = atomic_cmpxchg((v), c, c + (a)); | |
87 | if (likely(old == c)) | |
88 | break; | |
89 | c = old; | |
90 | } | |
f24219b4 | 91 | return c; |
f5e706ad SR |
92 | } |
93 | ||
f5e706ad SR |
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 | ||
86fa04b8 | 98 | static inline long atomic64_add_unless(atomic64_t *v, long a, long u) |
f5e706ad SR |
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 | ||
113 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) | |
114 | ||
f05a6865 | 115 | long atomic64_dec_if_positive(atomic64_t *v); |
193d2aad | 116 | |
f5e706ad | 117 | #endif /* !(__ARCH_SPARC64_ATOMIC__) */ |