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	s64 counter;
14} atomic64_t;
15
16#define ATOMIC64_INIT(i)	{ (i) }
17
18extern s64 atomic64_read(const atomic64_t *v);
19extern void atomic64_set(atomic64_t *v, s64 i);
20
21#define atomic64_set_release(v, i)	atomic64_set((v), (i))
22
23#define ATOMIC64_OP(op)							\
24extern void	 atomic64_##op(s64 a, atomic64_t *v);
25
26#define ATOMIC64_OP_RETURN(op)						\
27extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
28
29#define ATOMIC64_FETCH_OP(op)						\
30extern s64 atomic64_fetch_##op(s64 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 s64 atomic64_dec_if_positive(atomic64_t *v);
50#define atomic64_dec_if_positive atomic64_dec_if_positive
51extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
52extern s64 atomic64_xchg(atomic64_t *v, s64 new);
53extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
54#define atomic64_fetch_add_unless atomic64_fetch_add_unless
55
56#endif  /*  _ASM_GENERIC_ATOMIC64_H  */

 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	s64 counter;
14} atomic64_t;
15
16#define ATOMIC64_INIT(i)	{ (i) }
17
18extern s64 atomic64_read(const atomic64_t *v);
19extern void atomic64_set(atomic64_t *v, s64 i);
20
21#define atomic64_set_release(v, i)	atomic64_set((v), (i))
22
23#define ATOMIC64_OP(op)							\
24extern void	 atomic64_##op(s64 a, atomic64_t *v);
25
26#define ATOMIC64_OP_RETURN(op)						\
27extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
28
29#define ATOMIC64_FETCH_OP(op)						\
30extern s64 atomic64_fetch_##op(s64 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 s64 atomic64_dec_if_positive(atomic64_t *v);
50#define atomic64_dec_if_positive atomic64_dec_if_positive
51extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
52extern s64 atomic64_xchg(atomic64_t *v, s64 new);
53extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
54#define atomic64_fetch_add_unless atomic64_fetch_add_unless
55
56#endif  /*  _ASM_GENERIC_ATOMIC64_H  */