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