1 /* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */
3 #ifndef __ASM_CRIS_ATOMIC__
4 #define __ASM_CRIS_ATOMIC__
6 #include <linux/compiler.h>
7 #include <linux/types.h>
8 #include <asm/cmpxchg.h>
9 #include <arch/atomic.h>
10 #include <arch/system.h>
11 #include <asm/barrier.h>
14 * Atomic operations that C can't guarantee us. Useful for
15 * resource counting etc..
18 #define ATOMIC_INIT(i) { (i) }
20 #define atomic_read(v) ACCESS_ONCE((v)->counter)
21 #define atomic_set(v,i) (((v)->counter) = (i))
23 /* These should be written in asm but we do it in C for now. */
25 #define ATOMIC_OP(op, c_op) \
26 static inline void atomic_##op(int i, volatile atomic_t *v) \
28 unsigned long flags; \
29 cris_atomic_save(v, flags); \
31 cris_atomic_restore(v, flags); \
34 #define ATOMIC_OP_RETURN(op, c_op) \
35 static inline int atomic_##op##_return(int i, volatile atomic_t *v) \
37 unsigned long flags; \
39 cris_atomic_save(v, flags); \
40 retval = (v->counter c_op i); \
41 cris_atomic_restore(v, flags); \
45 #define ATOMIC_OPS(op, c_op) ATOMIC_OP(op, c_op) ATOMIC_OP_RETURN(op, c_op)
51 #undef ATOMIC_OP_RETURN
54 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
56 static inline int atomic_sub_and_test(int i, volatile atomic_t *v)
60 cris_atomic_save(v, flags);
61 retval = (v->counter -= i) == 0;
62 cris_atomic_restore(v, flags);
66 static inline void atomic_inc(volatile atomic_t *v)
69 cris_atomic_save(v, flags);
71 cris_atomic_restore(v, flags);
74 static inline void atomic_dec(volatile atomic_t *v)
77 cris_atomic_save(v, flags);
79 cris_atomic_restore(v, flags);
82 static inline int atomic_inc_return(volatile atomic_t *v)
86 cris_atomic_save(v, flags);
87 retval = ++(v->counter);
88 cris_atomic_restore(v, flags);
92 static inline int atomic_dec_return(volatile atomic_t *v)
96 cris_atomic_save(v, flags);
97 retval = --(v->counter);
98 cris_atomic_restore(v, flags);
101 static inline int atomic_dec_and_test(volatile atomic_t *v)
105 cris_atomic_save(v, flags);
106 retval = --(v->counter) == 0;
107 cris_atomic_restore(v, flags);
111 static inline int atomic_inc_and_test(volatile atomic_t *v)
115 cris_atomic_save(v, flags);
116 retval = ++(v->counter) == 0;
117 cris_atomic_restore(v, flags);
121 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
126 cris_atomic_save(v, flags);
128 if (likely(ret == old))
130 cris_atomic_restore(v, flags);
134 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
136 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
141 cris_atomic_save(v, flags);
145 cris_atomic_restore(v, flags);