/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */
  
  #ifndef __ASM_CRIS_ATOMIC__
  #define __ASM_CRIS_ATOMIC__
  
  #include <asm/system.h>

  #include <asm/arch/atomic.h>

  
  /*
   * Atomic operations that C can't guarantee us.  Useful for
   * resource counting etc..
   */

  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))
  
  /* These should be written in asm but we do it in C for now. */

  static inline void atomic_add(int i, volatile atomic_t *v)

  {
  	unsigned long flags;

  	cris_atomic_save(v, flags);

  	v->counter += i;

  	cris_atomic_restore(v, flags);

  }

  static inline void atomic_sub(int i, volatile atomic_t *v)

  {
  	unsigned long flags;

  	cris_atomic_save(v, flags);

  	v->counter -= i;

  	cris_atomic_restore(v, flags);

  }

  static inline int atomic_add_return(int i, volatile atomic_t *v)

  {
  	unsigned long flags;
  	int retval;

  	cris_atomic_save(v, flags);

  	retval = (v->counter += i);

  	cris_atomic_restore(v, flags);

  	return retval;
  }
  
  #define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)

  static inline int atomic_sub_return(int i, volatile atomic_t *v)

  {
  	unsigned long flags;
  	int retval;

  	cris_atomic_save(v, flags);

  	retval = (v->counter -= i);

  	cris_atomic_restore(v, flags);

  	return retval;
  }

  static inline int atomic_sub_and_test(int i, volatile atomic_t *v)

  {
  	int retval;
  	unsigned long flags;

  	cris_atomic_save(v, flags);

  	retval = (v->counter -= i) == 0;

  	cris_atomic_restore(v, flags);

  	return retval;
  }

  static inline void atomic_inc(volatile atomic_t *v)

  {
  	unsigned long flags;

  	cris_atomic_save(v, flags);

  	(v->counter)++;

  	cris_atomic_restore(v, flags);

  }

  static inline void atomic_dec(volatile atomic_t *v)

  {
  	unsigned long flags;

  	cris_atomic_save(v, flags);

  	(v->counter)--;

  	cris_atomic_restore(v, flags);

  }

  static inline int atomic_inc_return(volatile atomic_t *v)

  {
  	unsigned long flags;
  	int retval;

  	cris_atomic_save(v, flags);

  	retval = (v->counter)++;

  	cris_atomic_restore(v, flags);

  	return retval;
  }

  static inline int atomic_dec_return(volatile atomic_t *v)

  {
  	unsigned long flags;
  	int retval;

  	cris_atomic_save(v, flags);

  	retval = (v->counter)--;

  	cris_atomic_restore(v, flags);

  	return retval;
  }

  static inline int atomic_dec_and_test(volatile atomic_t *v)

  {
  	int retval;
  	unsigned long flags;

  	cris_atomic_save(v, flags);

  	retval = --(v->counter) == 0;

  	cris_atomic_restore(v, flags);

  	return retval;
  }

  static inline int atomic_inc_and_test(volatile atomic_t *v)

  {
  	int retval;
  	unsigned long flags;

  	cris_atomic_save(v, flags);

  	retval = ++(v->counter) == 0;

  	cris_atomic_restore(v, flags);

  	return retval;
  }

  static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
  {
  	int ret;
  	unsigned long flags;
  
  	cris_atomic_save(v, flags);
  	ret = v->counter;
  	if (likely(ret == old))
  		v->counter = new;
  	cris_atomic_restore(v, flags);
  	return ret;
  }

  #define atomic_xchg(v, new) (xchg(&((v)->counter), new))

  static inline int atomic_add_unless(atomic_t *v, int a, int u)
  {
  	int ret;
  	unsigned long flags;
  
  	cris_atomic_save(v, flags);
  	ret = v->counter;
  	if (ret != u)
  		v->counter += a;
  	cris_atomic_restore(v, flags);
  	return ret != u;
  }
  #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)

  /* 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()

  #include <asm-generic/atomic.h>

  #endif