1 #ifndef __ASM_CRIS_ATOMIC__
2 #define __ASM_CRIS_ATOMIC__
4 #include <asm/system.h>
7 * Atomic operations that C can't guarantee us. Useful for
8 * resource counting etc..
12 * Make sure gcc doesn't try to be clever and move things around
13 * on us. We need to use _exactly_ the address the user gave us,
14 * not some alias that contains the same information.
17 #define __atomic_fool_gcc(x) (*(struct { int a[100]; } *)x)
19 typedef struct { int counter; } atomic_t;
21 #define ATOMIC_INIT(i) { (i) }
23 #define atomic_read(v) ((v)->counter)
24 #define atomic_set(v,i) (((v)->counter) = (i))
26 /* These should be written in asm but we do it in C for now. */
28 extern __inline__ void atomic_add(int i, volatile atomic_t *v)
37 extern __inline__ void atomic_sub(int i, volatile atomic_t *v)
46 extern __inline__ int atomic_add_return(int i, volatile atomic_t *v)
52 retval = (v->counter += i);
57 extern __inline__ int atomic_sub_return(int i, volatile atomic_t *v)
63 retval = (v->counter -= i);
68 extern __inline__ int atomic_sub_and_test(int i, volatile atomic_t *v)
74 retval = (v->counter -= i) == 0;
79 extern __inline__ void atomic_inc(volatile atomic_t *v)
88 extern __inline__ void atomic_dec(volatile atomic_t *v)
97 extern __inline__ int atomic_inc_return(volatile atomic_t *v)
103 retval = (v->counter)++;
104 restore_flags(flags);
108 extern __inline__ int atomic_dec_return(volatile atomic_t *v)
114 retval = (v->counter)--;
115 restore_flags(flags);
118 extern __inline__ int atomic_dec_and_test(volatile atomic_t *v)
124 retval = --(v->counter) == 0;
125 restore_flags(flags);
129 extern __inline__ int atomic_inc_and_test(volatile atomic_t *v)
135 retval = ++(v->counter) == 0;
136 restore_flags(flags);
140 /* Atomic operations are already serializing */
141 #define smp_mb__before_atomic_dec() barrier()
142 #define smp_mb__after_atomic_dec() barrier()
143 #define smp_mb__before_atomic_inc() barrier()
144 #define smp_mb__after_atomic_inc() barrier()