[PATCH] mutex subsystem, add atomic_xchg() to all arches
[linux-3.10.git] / include / asm-h8300 / atomic.h
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
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
98 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
99
100 static 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
114 static __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
125 static __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 __ */