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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $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/config.h>
12#include <linux/types.h>
13
14typedef struct { volatile int counter; } atomic_t;
15typedef 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
26extern void atomic_add(int, atomic_t *);
27extern void atomic64_add(int, atomic64_t *);
28extern void atomic_sub(int, atomic_t *);
29extern void atomic64_sub(int, atomic64_t *);
30
31extern int atomic_add_ret(int, atomic_t *);
32extern int atomic64_add_ret(int, atomic64_t *);
33extern int atomic_sub_ret(int, atomic_t *);
34extern 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)
Hugh Dickins7c72aaf2005-11-23 13:37:40 -080057#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
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
Nick Piggin4a6dae62005-11-13 16:07:24 -080074#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
Ingo Molnarffbf6702006-01-09 15:59:17 -080075#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
Nick Piggin4a6dae62005-11-13 16:07:24 -080076
Nick Piggin8426e1f2005-11-13 16:07:25 -080077#define atomic_add_unless(v, a, u) \
78({ \
79 int c, old; \
80 c = atomic_read(v); \
81 while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
82 c = old; \
83 c != (u); \
84})
85#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087/* Atomic operations are already serializing */
88#ifdef CONFIG_SMP
David S. Miller4f071182005-08-29 12:46:22 -070089#define smp_mb__before_atomic_dec() membar_storeload_loadload();
90#define smp_mb__after_atomic_dec() membar_storeload_storestore();
91#define smp_mb__before_atomic_inc() membar_storeload_loadload();
92#define smp_mb__after_atomic_inc() membar_storeload_storestore();
Linus Torvalds1da177e2005-04-16 15:20:36 -070093#else
94#define smp_mb__before_atomic_dec() barrier()
95#define smp_mb__after_atomic_dec() barrier()
96#define smp_mb__before_atomic_inc() barrier()
97#define smp_mb__after_atomic_inc() barrier()
98#endif
99
Christoph Lameterd3cb4872006-01-06 00:11:20 -0800100#include <asm-generic/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#endif /* !(__ARCH_SPARC64_ATOMIC__) */