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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Generic implementation of 64-bit atomics using spinlocks,
4 * useful on processors that don't have 64-bit atomic instructions.
5 *
6 * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
7 */
8#ifndef _ASM_GENERIC_ATOMIC64_H
9#define _ASM_GENERIC_ATOMIC64_H
10#include <linux/types.h>
11
12typedef struct {
13 long long counter;
14} atomic64_t;
15
16#define ATOMIC64_INIT(i) { (i) }
17
18extern long long atomic64_read(const atomic64_t *v);
19extern void atomic64_set(atomic64_t *v, long long i);
20
21#define atomic64_set_release(v, i) atomic64_set((v), (i))
22
23#define ATOMIC64_OP(op) \
24extern void atomic64_##op(long long a, atomic64_t *v);
25
26#define ATOMIC64_OP_RETURN(op) \
27extern long long atomic64_##op##_return(long long a, atomic64_t *v);
28
29#define ATOMIC64_FETCH_OP(op) \
30extern long long atomic64_fetch_##op(long long a, atomic64_t *v);
31
32#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
33
34ATOMIC64_OPS(add)
35ATOMIC64_OPS(sub)
36
37#undef ATOMIC64_OPS
38#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
39
40ATOMIC64_OPS(and)
41ATOMIC64_OPS(or)
42ATOMIC64_OPS(xor)
43
44#undef ATOMIC64_OPS
45#undef ATOMIC64_FETCH_OP
46#undef ATOMIC64_OP_RETURN
47#undef ATOMIC64_OP
48
49extern long long atomic64_dec_if_positive(atomic64_t *v);
50#define atomic64_dec_if_positive atomic64_dec_if_positive
51extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
52extern long long atomic64_xchg(atomic64_t *v, long long new);
53extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u);
54#define atomic64_fetch_add_unless atomic64_fetch_add_unless
55
56#endif /* _ASM_GENERIC_ATOMIC64_H */