1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */
#ifndef __ASM_CRIS_ATOMIC__
#define __ASM_CRIS_ATOMIC__
#include <asm/system.h>
#include <asm/arch/atomic.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
*/
typedef struct { volatile int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
/* These should be written in asm but we do it in C for now. */
static inline void atomic_add(int i, volatile atomic_t *v)
{
unsigned long flags;
cris_atomic_save(v, flags);
v->counter += i;
cris_atomic_restore(v, flags);
}
static inline void atomic_sub(int i, volatile atomic_t *v)
{
unsigned long flags;
cris_atomic_save(v, flags);
v->counter -= i;
cris_atomic_restore(v, flags);
}
static inline int atomic_add_return(int i, volatile atomic_t *v)
{
unsigned long flags;
int retval;
cris_atomic_save(v, flags);
retval = (v->counter += i);
cris_atomic_restore(v, flags);
return retval;
}
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
static inline int atomic_sub_return(int i, volatile atomic_t *v)
{
unsigned long flags;
int retval;
cris_atomic_save(v, flags);
retval = (v->counter -= i);
cris_atomic_restore(v, flags);
return retval;
}
static inline int atomic_sub_and_test(int i, volatile atomic_t *v)
{
int retval;
unsigned long flags;
cris_atomic_save(v, flags);
retval = (v->counter -= i) == 0;
cris_atomic_restore(v, flags);
return retval;
}
static inline void atomic_inc(volatile atomic_t *v)
{
unsigned long flags;
cris_atomic_save(v, flags);
(v->counter)++;
cris_atomic_restore(v, flags);
}
static inline void atomic_dec(volatile atomic_t *v)
{
unsigned long flags;
cris_atomic_save(v, flags);
(v->counter)--;
cris_atomic_restore(v, flags);
}
static inline int atomic_inc_return(volatile atomic_t *v)
{
unsigned long flags;
int retval;
cris_atomic_save(v, flags);
retval = (v->counter)++;
cris_atomic_restore(v, flags);
return retval;
}
static inline int atomic_dec_return(volatile atomic_t *v)
{
unsigned long flags;
int retval;
cris_atomic_save(v, flags);
retval = (v->counter)--;
cris_atomic_restore(v, flags);
return retval;
}
static inline int atomic_dec_and_test(volatile atomic_t *v)
{
int retval;
unsigned long flags;
cris_atomic_save(v, flags);
retval = --(v->counter) == 0;
cris_atomic_restore(v, flags);
return retval;
}
static inline int atomic_inc_and_test(volatile atomic_t *v)
{
int retval;
unsigned long flags;
cris_atomic_save(v, flags);
retval = ++(v->counter) == 0;
cris_atomic_restore(v, flags);
return retval;
}
/* Atomic operations are already serializing */
#define smp_mb__before_atomic_dec() barrier()
#define smp_mb__after_atomic_dec() barrier()
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#endif
|
