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1/*
2 * Generic implementation of 64-bit atomics using spinlocks,
3 * useful on processors that don't have 64-bit atomic instructions.
4 *
5 * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12#ifndef _ASM_GENERIC_ATOMIC64_H
13#define _ASM_GENERIC_ATOMIC64_H
14#include <linux/types.h>
15
16typedef struct {
17 long long counter;
18} atomic64_t;
19
20#define ATOMIC64_INIT(i) { (i) }
21
22extern long long atomic64_read(const atomic64_t *v);
23extern void atomic64_set(atomic64_t *v, long long i);
24
25#define atomic64_set_release(v, i) atomic64_set((v), (i))
26
27#define ATOMIC64_OP(op) \
28extern void atomic64_##op(long long a, atomic64_t *v);
29
30#define ATOMIC64_OP_RETURN(op) \
31extern long long atomic64_##op##_return(long long a, atomic64_t *v);
32
33#define ATOMIC64_FETCH_OP(op) \
34extern long long atomic64_fetch_##op(long long a, atomic64_t *v);
35
36#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
37
38ATOMIC64_OPS(add)
39ATOMIC64_OPS(sub)
40
41#undef ATOMIC64_OPS
42#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
43
44ATOMIC64_OPS(and)
45ATOMIC64_OPS(or)
46ATOMIC64_OPS(xor)
47
48#undef ATOMIC64_OPS
49#undef ATOMIC64_FETCH_OP
50#undef ATOMIC64_OP_RETURN
51#undef ATOMIC64_OP
52
53extern long long atomic64_dec_if_positive(atomic64_t *v);
54#define atomic64_dec_if_positive atomic64_dec_if_positive
55extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
56extern long long atomic64_xchg(atomic64_t *v, long long new);
57extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u);
58#define atomic64_fetch_add_unless atomic64_fetch_add_unless
59
60#endif /* _ASM_GENERIC_ATOMIC64_H */