1 #ifndef __ARCH_H8300_ATOMIC__
2 #define __ARCH_H8300_ATOMIC__
3
4 #include <linux/types.h>
5
6 /*
7 * Atomic operations that C can't guarantee us. Useful for
8 * resource counting etc..
9 */
10
11 #define ATOMIC_INIT(i) { (i) }
12
13 #define atomic_read(v) (*(volatile int *)&(v)->counter)
14 #define atomic_set(v, i) (((v)->counter) = i)
15
16 #include <asm/system.h>
17 #include <linux/kernel.h>
18
atomic_add_return(int i,atomic_t * v)19 static __inline__ int atomic_add_return(int i, atomic_t *v)
20 {
21 unsigned long flags;
22 int ret;
23 local_irq_save(flags);
24 ret = v->counter += i;
25 local_irq_restore(flags);
26 return ret;
27 }
28
29 #define atomic_add(i, v) atomic_add_return(i, v)
30 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
31
atomic_sub_return(int i,atomic_t * v)32 static __inline__ int atomic_sub_return(int i, atomic_t *v)
33 {
34 unsigned long flags;
35 int ret;
36 local_irq_save(flags);
37 ret = v->counter -= i;
38 local_irq_restore(flags);
39 return ret;
40 }
41
42 #define atomic_sub(i, v) atomic_sub_return(i, v)
43 #define atomic_sub_and_test(i,v) (atomic_sub_return(i, v) == 0)
44
atomic_inc_return(atomic_t * v)45 static __inline__ int atomic_inc_return(atomic_t *v)
46 {
47 unsigned long flags;
48 int ret;
49 local_irq_save(flags);
50 v->counter++;
51 ret = v->counter;
52 local_irq_restore(flags);
53 return ret;
54 }
55
56 #define atomic_inc(v) atomic_inc_return(v)
57
58 /*
59 * atomic_inc_and_test - increment and test
60 * @v: pointer of type atomic_t
61 *
62 * Atomically increments @v by 1
63 * and returns true if the result is zero, or false for all
64 * other cases.
65 */
66 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
67
atomic_dec_return(atomic_t * v)68 static __inline__ int atomic_dec_return(atomic_t *v)
69 {
70 unsigned long flags;
71 int ret;
72 local_irq_save(flags);
73 --v->counter;
74 ret = v->counter;
75 local_irq_restore(flags);
76 return ret;
77 }
78
79 #define atomic_dec(v) atomic_dec_return(v)
80
atomic_dec_and_test(atomic_t * v)81 static __inline__ int atomic_dec_and_test(atomic_t *v)
82 {
83 unsigned long flags;
84 int ret;
85 local_irq_save(flags);
86 --v->counter;
87 ret = v->counter;
88 local_irq_restore(flags);
89 return ret == 0;
90 }
91
atomic_cmpxchg(atomic_t * v,int old,int new)92 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
93 {
94 int ret;
95 unsigned long flags;
96
97 local_irq_save(flags);
98 ret = v->counter;
99 if (likely(ret == old))
100 v->counter = new;
101 local_irq_restore(flags);
102 return ret;
103 }
104
105 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
106
__atomic_add_unless(atomic_t * v,int a,int u)107 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
108 {
109 int ret;
110 unsigned long flags;
111
112 local_irq_save(flags);
113 ret = v->counter;
114 if (ret != u)
115 v->counter += a;
116 local_irq_restore(flags);
117 return ret;
118 }
119
atomic_clear_mask(unsigned long mask,unsigned long * v)120 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
121 {
122 __asm__ __volatile__("stc ccr,r1l\n\t"
123 "orc #0x80,ccr\n\t"
124 "mov.l %0,er0\n\t"
125 "and.l %1,er0\n\t"
126 "mov.l er0,%0\n\t"
127 "ldc r1l,ccr"
128 : "=m" (*v) : "g" (~(mask)) :"er0","er1");
129 }
130
atomic_set_mask(unsigned long mask,unsigned long * v)131 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
132 {
133 __asm__ __volatile__("stc ccr,r1l\n\t"
134 "orc #0x80,ccr\n\t"
135 "mov.l %0,er0\n\t"
136 "or.l %1,er0\n\t"
137 "mov.l er0,%0\n\t"
138 "ldc r1l,ccr"
139 : "=m" (*v) : "g" (mask) :"er0","er1");
140 }
141
142 /* Atomic operations are already serializing */
143 #define smp_mb__before_atomic_dec() barrier()
144 #define smp_mb__after_atomic_dec() barrier()
145 #define smp_mb__before_atomic_inc() barrier()
146 #define smp_mb__after_atomic_inc() barrier()
147
148 #endif /* __ARCH_H8300_ATOMIC __ */
149