1 #ifndef __ARCH_H8300_ATOMIC__
2 #define __ARCH_H8300_ATOMIC__
5 * Atomic operations that C can't guarantee us. Useful for
6 * resource counting etc..
9 typedef struct { int counter; } atomic_t;
10 #define ATOMIC_INIT(i) { (i) }
12 #define atomic_read(v) ((v)->counter)
13 #define atomic_set(v, i) (((v)->counter) = i)
15 #include <asm/system.h>
16 #include <linux/kernel.h>
18 static __inline__ int atomic_add_return(int i, atomic_t *v)
21 local_irq_save(flags);
22 ret = v->counter += i;
23 local_irq_restore(flags);
27 #define atomic_add(i, v) atomic_add_return(i, v)
29 static __inline__ int atomic_sub_return(int i, atomic_t *v)
32 local_irq_save(flags);
33 ret = v->counter -= i;
34 local_irq_restore(flags);
38 #define atomic_sub(i, v) atomic_sub_return(i, v)
40 static __inline__ int atomic_inc_return(atomic_t *v)
43 local_irq_save(flags);
46 local_irq_restore(flags);
50 #define atomic_inc(v) atomic_inc_return(v)
52 static __inline__ int atomic_dec_return(atomic_t *v)
55 local_irq_save(flags);
58 local_irq_restore(flags);
62 #define atomic_dec(v) atomic_dec_return(v)
64 static __inline__ int atomic_dec_and_test(atomic_t *v)
67 local_irq_save(flags);
70 local_irq_restore(flags);
74 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
76 __asm__ __volatile__("stc ccr,r1l\n\t"
82 : "=m" (*v) : "g" (~(mask)) :"er0","er1");
85 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
87 __asm__ __volatile__("stc ccr,r1l\n\t"
93 : "=m" (*v) : "g" (mask) :"er0","er1");
96 /* Atomic operations are already serializing */
97 #define smp_mb__before_atomic_dec() barrier()
98 #define smp_mb__after_atomic_dec() barrier()
99 #define smp_mb__before_atomic_inc() barrier()
100 #define smp_mb__after_atomic_inc() barrier()
102 #endif /* __ARCH_H8300_ATOMIC __ */