blob: 7230f650799501e59044322fd7196f72eddb4400 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
9typedef 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
18static __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
30static __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
41static __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
63static __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
75static __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
85static __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
96static __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 __ */