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/*-
 *   BSD LICENSE
 * 
 *   Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
 *   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.
 *     * Neither the name of Intel Corporation nor the names of its 
 *       contributors may be used to endorse or promote products derived 
 *       from this software without specific prior written permission.
 * 
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 *   "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 COPYRIGHT 
 *   OWNER OR CONTRIBUTORS 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.
 * 
 */

#ifndef _RTE_INTERRUPTS_H_
#define _RTE_INTERRUPTS_H_

/**
 * @file
 *
 * The RTE interrupt interface provides functions to register/unregister
 * callbacks for a specific interrupt.
 */

#ifdef __cplusplus
extern "C" {
#endif

/** Interupt handle */
struct rte_intr_handle;

/** Function to be registered for the specific interrupt */
typedef void (*rte_intr_callback_fn)(struct rte_intr_handle *intr_handle,
							void *cb_arg);

#include <exec-env/rte_interrupts.h>

/**
 * It registers the callback for the specific interrupt. Multiple
 * callbacks cal be registered at the same time.
 * @param intr_handle
 *  Pointer to the interrupt handle.
 * @param cb
 *  callback address.
 * @param cb_arg
 *  address of parameter for callback.
 *
 * @return
 *  - On success, zero.
 *  - On failure, a negative value.
 */
int rte_intr_callback_register(struct rte_intr_handle *intr_handle,
				rte_intr_callback_fn cb, void *cb_arg);

/**
 * It unregisters the callback according to the specified interrupt handle.
 *
 * @param intr_handle
 *  pointer to the interrupt handle.
 * @param cb
 *  callback address.
 * @param cb_arg
 *  address of parameter for callback, (void *)-1 means to remove all
 *  registered which has the same callback address.
 *
 * @return
 *  - On success, return the number of callback entities removed.
 *  - On failure, a negative value.
 */
int rte_intr_callback_unregister(struct rte_intr_handle *intr_handle,
				rte_intr_callback_fn cb, void *cb_arg);

/**
 * It enables the interrupt for the specified handle.
 *
 * @param intr_handle
 *  pointer to the interrupt handle.
 *
 * @return
 *  - On success, zero.
 *  - On failure, a negative value.
 */
int rte_intr_enable(struct rte_intr_handle *intr_handle);

/**
 * It disables the interrupt for the specified handle.
 *
 * @param intr_handle
 *  pointer to the interrupt handle.
 *
 * @return
 *  - On success, zero.
 *  - On failure, a negative value.
 */
int rte_intr_disable(struct rte_intr_handle *intr_handle);

#ifdef __cplusplus
}
#endif

#endif