1 #ifndef __ASM_SH_ATOMIC_H
2 #define __ASM_SH_ATOMIC_H
5 * Atomic operations that C can't guarantee us. Useful for
6 * resource counting etc..
10 #include <linux/compiler.h>
11 #include <linux/types.h>
12 #include <asm/system.h>
14 #define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
16 #define atomic_read(v) (*(volatile int *)&(v)->counter)
17 #define atomic_set(v,i) ((v)->counter = (i))
19 #if defined(CONFIG_GUSA_RB)
20 #include <asm/atomic-grb.h>
21 #elif defined(CONFIG_CPU_SH4A)
22 #include <asm/atomic-llsc.h>
24 #include <asm/atomic-irq.h>
27 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
28 #define atomic_dec_return(v) atomic_sub_return(1, (v))
29 #define atomic_inc_return(v) atomic_add_return(1, (v))
30 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
31 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
32 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
33 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
35 #define atomic_inc(v) atomic_add(1, (v))
36 #define atomic_dec(v) atomic_sub(1, (v))
38 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
39 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
42 * atomic_add_unless - add unless the number is a given value
43 * @v: pointer of type atomic_t
44 * @a: the amount to add to v...
45 * @u: ...unless v is equal to u.
47 * Atomically adds @a to @v, so long as it was not @u.
48 * Returns non-zero if @v was not @u, and zero otherwise.
50 static inline int atomic_add_unless(atomic_t *v, int a, int u)
55 if (unlikely(c == (u)))
57 old = atomic_cmpxchg((v), c, c + (a));
66 #define smp_mb__before_atomic_dec() smp_mb()
67 #define smp_mb__after_atomic_dec() smp_mb()
68 #define smp_mb__before_atomic_inc() smp_mb()
69 #define smp_mb__after_atomic_inc() smp_mb()
71 #include <asm-generic/atomic-long.h>
72 #include <asm-generic/atomic64.h>
74 #endif /* __ASM_SH_ATOMIC_H */