/*
 * Copyright (c) 2017, Stefan Lankes, RWTH Aachen University
 * 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 the University 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 REGENTS 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.
 */

 /**
  * @author Stefan Lankes
  * @file arch/aarch64/include/asm/io.h
  * @brief Functions related to processor IO
  *
  * This file contains inline functions for processor IO operations.
  */

#ifndef __ARCH_IO_H__
#define __ARCH_IO_H__

#ifdef __cplusplus
extern "C" {
#endif

/** @brief Read a byte from an IO port
 *
 * @param _port The port you want to read from
 * @return The value which reads out from this port
 */
inline static unsigned char inportb(unsigned short _port)
{
	return *((unsigned char*)(size_t)_port);
}

/** @brief Read a word (2 byte) from an IO port
 *
 * @param _port The port you want to read from
 * @return The value which reads out from this port
 */
inline static unsigned short inportw(unsigned short _port)
{
	return *((unsigned short*)(size_t)_port);
}

/** @brief Read a double word (4 byte) from an IO port
 *
 * @param _port The port you want to read from
 * @return The value which reads out from this port
 */
inline static unsigned int inportl(unsigned short _port)
{
	return *((unsigned int*)(size_t)_port);
}

/** @brief Write a byte to an IO port
 *
 * @param _port The port you want to write to
 * @param _data the 1 byte value you want to write
 */
inline static void outportb(unsigned short _port, unsigned char _data)
{
	*((unsigned char*)(size_t)_port) = _data;
}

/** @brief Write a word (2 bytes) to an IO port
 *
 * @param _port The port you want to write to
 * @param _data the 2 byte value you want to write
 */
inline static void outportw(unsigned short _port, unsigned short _data)
{
	*((unsigned short*)(size_t)_port) = _data;
}

/** @brief Write a double word (4 bytes) to an IO port
 *
 * @param _port The port you want to write to
 * @param _data the 4 byte value you want to write
 */
inline static void outportl(unsigned short _port, unsigned int _data)
{
	*((unsigned int*)(size_t)_port) = _data;
}

#ifdef __cplusplus
}
#endif

#endif