/*
 * Copyright (c) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup generic
 * @{
 */
/** @file
 */

#ifndef KERN_ATOMIC_H_
#define KERN_ATOMIC_H_

#include <typedefs.h>
#include <arch/atomic.h>
#include <verify.h>

NO_TRACE ATOMIC static inline void atomic_set(atomic_t *val, atomic_count_t i)
    WRITES(&val->count)
    REQUIRES_EXTENT_MUTABLE(val)
{
	val->count = i;
}

NO_TRACE ATOMIC static inline atomic_count_t atomic_get(atomic_t *val)
    REQUIRES_EXTENT_MUTABLE(val)
{
	return val->count;
}


/*
 * If the architecture does not provide operations that are atomic
 * only with respect to the local cpu (eg exception handlers) and
 * not other cpus, implement these cpu local atomic operations with
 * full blown smp-safe atomics.
 */
#ifndef local_atomic_exchange
#define local_atomic_exchange(var_addr, new_val) \
	__atomic_exchange_n((var_addr), (new_val), __ATOMIC_RELAXED)
#endif



#endif

/** @}
 */