Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef __ARCH_H8300_ATOMIC__
2#define __ARCH_H8300_ATOMIC__
3
4/*
5 * Atomic operations that C can't guarantee us. Useful for
6 * resource counting etc..
7 */
8
9typedef struct { int counter; } atomic_t;
10#define ATOMIC_INIT(i) { (i) }
11
12#define atomic_read(v) ((v)->counter)
13#define atomic_set(v, i) (((v)->counter) = i)
14
15#include <asm/system.h>
16#include <linux/kernel.h>
17
18static __inline__ int atomic_add_return(int i, atomic_t *v)
19{
20 int ret,flags;
21 local_irq_save(flags);
22 ret = v->counter += i;
23 local_irq_restore(flags);
24 return ret;
25}
26
27#define atomic_add(i, v) atomic_add_return(i, v)
28#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
29
30static __inline__ int atomic_sub_return(int i, atomic_t *v)
31{
32 int ret,flags;
33 local_irq_save(flags);
34 ret = v->counter -= i;
35 local_irq_restore(flags);
36 return ret;
37}
38
39#define atomic_sub(i, v) atomic_sub_return(i, v)
40
41static __inline__ int atomic_inc_return(atomic_t *v)
42{
43 int ret,flags;
44 local_irq_save(flags);
45 v->counter++;
46 ret = v->counter;
47 local_irq_restore(flags);
48 return ret;
49}
50
51#define atomic_inc(v) atomic_inc_return(v)
52
53/*
54 * atomic_inc_and_test - increment and test
55 * @v: pointer of type atomic_t
56 *
57 * Atomically increments @v by 1
58 * and returns true if the result is zero, or false for all
59 * other cases.
60 */
61#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
62
63static __inline__ int atomic_dec_return(atomic_t *v)
64{
65 int ret,flags;
66 local_irq_save(flags);
67 --v->counter;
68 ret = v->counter;
69 local_irq_restore(flags);
70 return ret;
71}
72
73#define atomic_dec(v) atomic_dec_return(v)
74
75static __inline__ int atomic_dec_and_test(atomic_t *v)
76{
77 int ret,flags;
78 local_irq_save(flags);
79 --v->counter;
80 ret = v->counter;
81 local_irq_restore(flags);
82 return ret == 0;
83}
84
85static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
86{
87 int ret;
88 unsigned long flags;
89
90 local_irq_save(flags);
91 ret = v->counter;
92 if (likely(ret == old))
93 v->counter = new;
94 local_irq_restore(flags);
95 return ret;
96}
97
98#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
99
100static inline int atomic_add_unless(atomic_t *v, int a, int u)
101{
102 int ret;
103 unsigned long flags;
104
105 local_irq_save(flags);
106 ret = v->counter;
107 if (ret != u)
108 v->counter += a;
109 local_irq_restore(flags);
110 return ret != u;
111}
112#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
113
114static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
115{
116 __asm__ __volatile__("stc ccr,r1l\n\t"
117 "orc #0x80,ccr\n\t"
118 "mov.l %0,er0\n\t"
119 "and.l %1,er0\n\t"
120 "mov.l er0,%0\n\t"
121 "ldc r1l,ccr"
122 : "=m" (*v) : "g" (~(mask)) :"er0","er1");
123}
124
125static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
126{
127 __asm__ __volatile__("stc ccr,r1l\n\t"
128 "orc #0x80,ccr\n\t"
129 "mov.l %0,er0\n\t"
130 "or.l %1,er0\n\t"
131 "mov.l er0,%0\n\t"
132 "ldc r1l,ccr"
133 : "=m" (*v) : "g" (mask) :"er0","er1");
134}
135
136/* Atomic operations are already serializing */
137#define smp_mb__before_atomic_dec() barrier()
138#define smp_mb__after_atomic_dec() barrier()
139#define smp_mb__before_atomic_inc() barrier()
140#define smp_mb__after_atomic_inc() barrier()
141
142#include <asm-generic/atomic.h>
143#endif /* __ARCH_H8300_ATOMIC __ */