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9#ifndef __ASM_GENERIC_ATOMIC_H
10#define __ASM_GENERIC_ATOMIC_H
11
12#include <asm/cmpxchg.h>
13#include <asm/barrier.h>
14
15#ifdef CONFIG_SMP
16
17
18
19#define ATOMIC_OP(op, c_op) \
20static inline void generic_atomic_##op(int i, atomic_t *v) \
21{ \
22 int c, old; \
23 \
24 c = v->counter; \
25 while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \
26 c = old; \
27}
28
29#define ATOMIC_OP_RETURN(op, c_op) \
30static inline int generic_atomic_##op##_return(int i, atomic_t *v) \
31{ \
32 int c, old; \
33 \
34 c = v->counter; \
35 while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \
36 c = old; \
37 \
38 return c c_op i; \
39}
40
41#define ATOMIC_FETCH_OP(op, c_op) \
42static inline int generic_atomic_fetch_##op(int i, atomic_t *v) \
43{ \
44 int c, old; \
45 \
46 c = v->counter; \
47 while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \
48 c = old; \
49 \
50 return c; \
51}
52
53#else
54
55#include <linux/irqflags.h>
56
57#define ATOMIC_OP(op, c_op) \
58static inline void generic_atomic_##op(int i, atomic_t *v) \
59{ \
60 unsigned long flags; \
61 \
62 raw_local_irq_save(flags); \
63 v->counter = v->counter c_op i; \
64 raw_local_irq_restore(flags); \
65}
66
67#define ATOMIC_OP_RETURN(op, c_op) \
68static inline int generic_atomic_##op##_return(int i, atomic_t *v) \
69{ \
70 unsigned long flags; \
71 int ret; \
72 \
73 raw_local_irq_save(flags); \
74 ret = (v->counter = v->counter c_op i); \
75 raw_local_irq_restore(flags); \
76 \
77 return ret; \
78}
79
80#define ATOMIC_FETCH_OP(op, c_op) \
81static inline int generic_atomic_fetch_##op(int i, atomic_t *v) \
82{ \
83 unsigned long flags; \
84 int ret; \
85 \
86 raw_local_irq_save(flags); \
87 ret = v->counter; \
88 v->counter = v->counter c_op i; \
89 raw_local_irq_restore(flags); \
90 \
91 return ret; \
92}
93
94#endif
95
96ATOMIC_OP_RETURN(add, +)
97ATOMIC_OP_RETURN(sub, -)
98
99ATOMIC_FETCH_OP(add, +)
100ATOMIC_FETCH_OP(sub, -)
101ATOMIC_FETCH_OP(and, &)
102ATOMIC_FETCH_OP(or, |)
103ATOMIC_FETCH_OP(xor, ^)
104
105ATOMIC_OP(add, +)
106ATOMIC_OP(sub, -)
107ATOMIC_OP(and, &)
108ATOMIC_OP(or, |)
109ATOMIC_OP(xor, ^)
110
111#undef ATOMIC_FETCH_OP
112#undef ATOMIC_OP_RETURN
113#undef ATOMIC_OP
114
115#define arch_atomic_add_return generic_atomic_add_return
116#define arch_atomic_sub_return generic_atomic_sub_return
117
118#define arch_atomic_fetch_add generic_atomic_fetch_add
119#define arch_atomic_fetch_sub generic_atomic_fetch_sub
120#define arch_atomic_fetch_and generic_atomic_fetch_and
121#define arch_atomic_fetch_or generic_atomic_fetch_or
122#define arch_atomic_fetch_xor generic_atomic_fetch_xor
123
124#define arch_atomic_add generic_atomic_add
125#define arch_atomic_sub generic_atomic_sub
126#define arch_atomic_and generic_atomic_and
127#define arch_atomic_or generic_atomic_or
128#define arch_atomic_xor generic_atomic_xor
129
130#define arch_atomic_read(v) READ_ONCE((v)->counter)
131#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
132
133#define arch_atomic_xchg(ptr, v) (arch_xchg(&(ptr)->counter, (v)))
134#define arch_atomic_cmpxchg(v, old, new) (arch_cmpxchg(&((v)->counter), (old), (new)))
135
136#endif
137
