1 #ifndef __ARCH_H8300_ATOMIC__
2 #define __ARCH_H8300_ATOMIC__
4 #include <linux/types.h>
7 * Atomic operations that C can't guarantee us. Useful for
8 * resource counting etc..
11 #define ATOMIC_INIT(i) { (i) }
13 #define atomic_read(v) (*(volatile int *)&(v)->counter)
14 #define atomic_set(v, i) (((v)->counter) = i)
16 #include <asm/system.h>
17 #include <linux/kernel.h>
19 static __inline__ int atomic_add_return(int i, atomic_t *v)
23 local_irq_save(flags);
24 ret = v->counter += i;
25 local_irq_restore(flags);
29 #define atomic_add(i, v) atomic_add_return(i, v)
30 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
32 static __inline__ int atomic_sub_return(int i, atomic_t *v)
36 local_irq_save(flags);
37 ret = v->counter -= i;
38 local_irq_restore(flags);
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)
45 static __inline__ int atomic_inc_return(atomic_t *v)
49 local_irq_save(flags);
52 local_irq_restore(flags);
56 #define atomic_inc(v) atomic_inc_return(v)
59 * atomic_inc_and_test - increment and test
60 * @v: pointer of type atomic_t
62 * Atomically increments @v by 1
63 * and returns true if the result is zero, or false for all
66 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
68 static __inline__ int atomic_dec_return(atomic_t *v)
72 local_irq_save(flags);
75 local_irq_restore(flags);
79 #define atomic_dec(v) atomic_dec_return(v)
81 static __inline__ int atomic_dec_and_test(atomic_t *v)
85 local_irq_save(flags);
88 local_irq_restore(flags);
92 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
97 local_irq_save(flags);
99 if (likely(ret == old))
101 local_irq_restore(flags);
105 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
107 static inline int atomic_add_unless(atomic_t *v, int a, int u)
112 local_irq_save(flags);
116 local_irq_restore(flags);
119 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
121 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
123 __asm__ __volatile__("stc ccr,r1l\n\t"
129 : "=m" (*v) : "g" (~(mask)) :"er0","er1");
132 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
134 __asm__ __volatile__("stc ccr,r1l\n\t"
140 : "=m" (*v) : "g" (mask) :"er0","er1");
143 /* Atomic operations are already serializing */
144 #define smp_mb__before_atomic_dec() barrier()
145 #define smp_mb__after_atomic_dec() barrier()
146 #define smp_mb__before_atomic_inc() barrier()
147 #define smp_mb__after_atomic_inc() barrier()
149 #include <asm-generic/atomic-long.h>
150 #endif /* __ARCH_H8300_ATOMIC __ */