7230f650799501e59044322fd7196f72eddb4400
[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__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
86 {
87         __asm__ __volatile__("stc ccr,r1l\n\t"
88                              "orc #0x80,ccr\n\t"
89                              "mov.l %0,er0\n\t"
90                              "and.l %1,er0\n\t"
91                              "mov.l er0,%0\n\t"
92                              "ldc r1l,ccr" 
93                              : "=m" (*v) : "g" (~(mask)) :"er0","er1");
94 }
95
96 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
97 {
98         __asm__ __volatile__("stc ccr,r1l\n\t"
99                              "orc #0x80,ccr\n\t"
100                              "mov.l %0,er0\n\t"
101                              "or.l %1,er0\n\t"
102                              "mov.l er0,%0\n\t"
103                              "ldc r1l,ccr" 
104                              : "=m" (*v) : "g" (mask) :"er0","er1");
105 }
106
107 /* Atomic operations are already serializing */
108 #define smp_mb__before_atomic_dec()    barrier()
109 #define smp_mb__after_atomic_dec() barrier()
110 #define smp_mb__before_atomic_inc()    barrier()
111 #define smp_mb__after_atomic_inc() barrier()
112
113 #endif /* __ARCH_H8300_ATOMIC __ */