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
12 typedef struct {
13 s64 counter;
14 } atomic64_t;
15
16 #define ATOMIC64_INIT(i) { (i) }
17
18 extern s64 generic_atomic64_read(const atomic64_t *v);
19 extern void generic_atomic64_set(atomic64_t *v, s64 i);
20
21 #define ATOMIC64_OP(op) \
22 extern void generic_atomic64_##op(s64 a, atomic64_t *v);
23
24 #define ATOMIC64_OP_RETURN(op) \
25 extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v);
26
27 #define ATOMIC64_FETCH_OP(op) \
28 extern s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v);
29
30 #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
31
32 ATOMIC64_OPS(add)
33 ATOMIC64_OPS(sub)
34
35 #undef ATOMIC64_OPS
36 #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
37
38 ATOMIC64_OPS(and)
39 ATOMIC64_OPS(or)
40 ATOMIC64_OPS(xor)
41
42 #undef ATOMIC64_OPS
43 #undef ATOMIC64_FETCH_OP
44 #undef ATOMIC64_OP_RETURN
45 #undef ATOMIC64_OP
46
47 extern s64 generic_atomic64_dec_if_positive(atomic64_t *v);
48 extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
49 extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new);
50 extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
51
52 #define arch_atomic64_read generic_atomic64_read
53 #define arch_atomic64_set generic_atomic64_set
54 #define arch_atomic64_set_release generic_atomic64_set
55
56 #define arch_atomic64_add generic_atomic64_add
57 #define arch_atomic64_add_return generic_atomic64_add_return
58 #define arch_atomic64_fetch_add generic_atomic64_fetch_add
59 #define arch_atomic64_sub generic_atomic64_sub
60 #define arch_atomic64_sub_return generic_atomic64_sub_return
61 #define arch_atomic64_fetch_sub generic_atomic64_fetch_sub
62
63 #define arch_atomic64_and generic_atomic64_and
64 #define arch_atomic64_fetch_and generic_atomic64_fetch_and
65 #define arch_atomic64_or generic_atomic64_or
66 #define arch_atomic64_fetch_or generic_atomic64_fetch_or
67 #define arch_atomic64_xor generic_atomic64_xor
68 #define arch_atomic64_fetch_xor generic_atomic64_fetch_xor
69
70 #define arch_atomic64_dec_if_positive generic_atomic64_dec_if_positive
71 #define arch_atomic64_cmpxchg generic_atomic64_cmpxchg
72 #define arch_atomic64_xchg generic_atomic64_xchg
73 #define arch_atomic64_fetch_add_unless generic_atomic64_fetch_add_unless
74
75 #endif /* _ASM_GENERIC_ATOMIC64_H */
76
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