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1da177e4 LT |
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 | ||
9 | typedef 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 | ||
18 | static __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 | ||
30 | static __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 | ||
41 | static __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 | ||
63 | static __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 | ||
75 | static __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 | ||
4a6dae6d NP |
85 | static 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 | ||
8426e1f6 NP |
98 | static inline int atomic_add_unless(atomic_t *v, int a, int u) |
99 | { | |
100 | int ret; | |
101 | unsigned long flags; | |
102 | ||
103 | local_irq_save(flags); | |
104 | ret = v->counter; | |
105 | if (ret != u) | |
106 | v->counter += a; | |
107 | local_irq_restore(flags); | |
108 | return ret != u; | |
109 | } | |
110 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
111 | ||
1da177e4 LT |
112 | static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v) |
113 | { | |
114 | __asm__ __volatile__("stc ccr,r1l\n\t" | |
115 | "orc #0x80,ccr\n\t" | |
116 | "mov.l %0,er0\n\t" | |
117 | "and.l %1,er0\n\t" | |
118 | "mov.l er0,%0\n\t" | |
119 | "ldc r1l,ccr" | |
120 | : "=m" (*v) : "g" (~(mask)) :"er0","er1"); | |
121 | } | |
122 | ||
123 | static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v) | |
124 | { | |
125 | __asm__ __volatile__("stc ccr,r1l\n\t" | |
126 | "orc #0x80,ccr\n\t" | |
127 | "mov.l %0,er0\n\t" | |
128 | "or.l %1,er0\n\t" | |
129 | "mov.l er0,%0\n\t" | |
130 | "ldc r1l,ccr" | |
131 | : "=m" (*v) : "g" (mask) :"er0","er1"); | |
132 | } | |
133 | ||
134 | /* Atomic operations are already serializing */ | |
135 | #define smp_mb__before_atomic_dec() barrier() | |
136 | #define smp_mb__after_atomic_dec() barrier() | |
137 | #define smp_mb__before_atomic_inc() barrier() | |
138 | #define smp_mb__after_atomic_inc() barrier() | |
139 | ||
d3cb4871 | 140 | #include <asm-generic/atomic.h> |
1da177e4 | 141 | #endif /* __ARCH_H8300_ATOMIC __ */ |