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/* $Id: atomic.h,v 1.1.1.1 2004-04-15 03:00:53 phoenix Exp $

 * atomic.h: Thankfully the V9 is at least reasonable for this

 *           stuff.

 *

 * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)

 */

#ifndef __ARCH_SPARC64_ATOMIC__

#define __ARCH_SPARC64_ATOMIC__

typedef struct { volatile int counter; } atomic_t;

#define ATOMIC_INIT(i)  { (i) }

#define atomic_read(v)          ((v)->counter)

#define atomic_set(v, i)        (((v)->counter) = i)

extern int __atomic_add(int, atomic_t *);

extern int __atomic_sub(int, atomic_t *);

#define atomic_add(i, v) ((void)__atomic_add(i, v))

#define atomic_sub(i, v) ((void)__atomic_sub(i, v))

#define atomic_dec_return(v) __atomic_sub(1, v)

#define atomic_inc_return(v) __atomic_add(1, v)

#define atomic_sub_and_test(i, v) (__atomic_sub(i, v) == 0)

#define atomic_dec_and_test(v) (__atomic_sub(1, v) == 0)

#define atomic_inc(v) ((void)__atomic_add(1, v))

#define atomic_dec(v) ((void)__atomic_sub(1, v))

/* Atomic operations are already serializing */

#define smp_mb__before_atomic_dec()     barrier()

#define smp_mb__after_atomic_dec()      barrier()

#define smp_mb__before_atomic_inc()     barrier()

#define smp_mb__after_atomic_inc()      barrier()

#endif /* !(__ARCH_SPARC64_ATOMIC__) */