1 /* $Id: atomic.h,v 1.1.1.1 2005/04/11 02:50:57 jack Exp $
2 * atomic.h: Thankfully the V9 is at least reasonable for this
5 * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)
8 #ifndef __ARCH_SPARC64_ATOMIC__
9 #define __ARCH_SPARC64_ATOMIC__
11 typedef struct { volatile int counter; } atomic_t;
12 #define ATOMIC_INIT(i) { (i) }
14 #define atomic_read(v) ((v)->counter)
15 #define atomic_set(v, i) (((v)->counter) = i)
17 extern int __atomic_add(int, atomic_t *);
18 extern int __atomic_sub(int, atomic_t *);
20 #define atomic_add(i, v) ((void)__atomic_add(i, v))
21 #define atomic_sub(i, v) ((void)__atomic_sub(i, v))
23 #define atomic_dec_return(v) __atomic_sub(1, v)
24 #define atomic_inc_return(v) __atomic_add(1, v)
26 #define atomic_sub_and_test(i, v) (__atomic_sub(i, v) == 0)
27 #define atomic_dec_and_test(v) (__atomic_sub(1, v) == 0)
29 #define atomic_inc(v) ((void)__atomic_add(1, v))
30 #define atomic_dec(v) ((void)__atomic_sub(1, v))
32 /* Atomic operations are already serializing */
33 #define smp_mb__before_atomic_dec() barrier()
34 #define smp_mb__after_atomic_dec() barrier()
35 #define smp_mb__before_atomic_inc() barrier()
36 #define smp_mb__after_atomic_inc() barrier()
38 #endif /* !(__ARCH_SPARC64_ATOMIC__) */