c3feb3af2cfe2e453f310ab6645c6ad15a2ec73f
[linux-2.6.git] / include / asm-sparc64 / atomic.h
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
11 #include <linux/types.h>
12
13 typedef struct { volatile int counter; } atomic_t;
14 typedef struct { volatile __s64 counter; } atomic64_t;
15
16 #define ATOMIC_INIT(i)          { (i) }
17 #define ATOMIC64_INIT(i)        { (i) }
18
19 #define atomic_read(v)          ((v)->counter)
20 #define atomic64_read(v)        ((v)->counter)
21
22 #define atomic_set(v, i)        (((v)->counter) = i)
23 #define atomic64_set(v, i)      (((v)->counter) = i)
24
25 extern void atomic_add(int, atomic_t *);
26 extern void atomic64_add(int, atomic64_t *);
27 extern void atomic_sub(int, atomic_t *);
28 extern void atomic64_sub(int, atomic64_t *);
29
30 extern int atomic_add_ret(int, atomic_t *);
31 extern int atomic64_add_ret(int, atomic64_t *);
32 extern int atomic_sub_ret(int, atomic_t *);
33 extern int atomic64_sub_ret(int, atomic64_t *);
34
35 #define atomic_dec_return(v) atomic_sub_ret(1, v)
36 #define atomic64_dec_return(v) atomic64_sub_ret(1, v)
37
38 #define atomic_inc_return(v) atomic_add_ret(1, v)
39 #define atomic64_inc_return(v) atomic64_add_ret(1, v)
40
41 #define atomic_sub_return(i, v) atomic_sub_ret(i, v)
42 #define atomic64_sub_return(i, v) atomic64_sub_ret(i, v)
43
44 #define atomic_add_return(i, v) atomic_add_ret(i, v)
45 #define atomic64_add_return(i, v) atomic64_add_ret(i, v)
46
47 /*
48  * atomic_inc_and_test - increment and test
49  * @v: pointer of type atomic_t
50  *
51  * Atomically increments @v by 1
52  * and returns true if the result is zero, or false for all
53  * other cases.
54  */
55 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
56 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
57
58 #define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0)
59 #define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0)
60
61 #define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0)
62 #define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0)
63
64 #define atomic_inc(v) atomic_add(1, v)
65 #define atomic64_inc(v) atomic64_add(1, v)
66
67 #define atomic_dec(v) atomic_sub(1, v)
68 #define atomic64_dec(v) atomic64_sub(1, v)
69
70 #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
71 #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
72
73 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
74 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
75
76 #define atomic_add_unless(v, a, u)                              \
77 ({                                                              \
78         __typeof__((v)->counter) c, old;                        \
79         c = atomic_read(v);                                     \
80         for (;;) {                                              \
81                 if (unlikely(c == (u)))                         \
82                         break;                                  \
83                 old = atomic_cmpxchg((v), c, c + (a));          \
84                 if (likely(old == c))                           \
85                         break;                                  \
86                 c = old;                                        \
87         }                                                       \
88         likely(c != (u));                                       \
89 })
90 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
91
92 #define atomic64_cmpxchg(v, o, n) \
93         ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
94 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
95
96 #define atomic64_add_unless(v, a, u)                            \
97 ({                                                              \
98         __typeof__((v)->counter) c, old;                        \
99         c = atomic64_read(v);                                   \
100         for (;;) {                                              \
101                 if (unlikely(c == (u)))                         \
102                         break;                                  \
103                 old = atomic64_cmpxchg((v), c, c + (a));        \
104                 if (likely(old == c))                           \
105                         break;                                  \
106                 c = old;                                        \
107         }                                                       \
108         likely(c != (u));                                       \
109 })
110 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
111
112 /* Atomic operations are already serializing */
113 #ifdef CONFIG_SMP
114 #define smp_mb__before_atomic_dec()     membar_storeload_loadload();
115 #define smp_mb__after_atomic_dec()      membar_storeload_storestore();
116 #define smp_mb__before_atomic_inc()     membar_storeload_loadload();
117 #define smp_mb__after_atomic_inc()      membar_storeload_storestore();
118 #else
119 #define smp_mb__before_atomic_dec()     barrier()
120 #define smp_mb__after_atomic_dec()      barrier()
121 #define smp_mb__before_atomic_inc()     barrier()
122 #define smp_mb__after_atomic_inc()      barrier()
123 #endif
124
125 #include <asm-generic/atomic.h>
126 #endif /* !(__ARCH_SPARC64_ATOMIC__) */