/*********************************************************************
 *
 * Copyright (C) 2002-2004, 2007,  Karlsruhe University
 *
 * File path:     arch/x86/ioport.h
 * Description:   contains x86 specific ioport handling
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $Id$
 *
 ********************************************************************/
#ifndef __ARCH__X86__IOPORT_H__
#define __ARCH__X86__IOPORT_H__


/**
 * Writes a byte to an IO port
 *
 * @param port  port number
 * @param val   value
 */
INLINE void out_u8(const u16_t port, const u8_t val)
{
    /* GCC can optimize here if constant */
    __asm__ __volatile__("outb  %1, %0\n"
             :
             : "dN"(port), "a"(val));
}

/**
 * Reads a byte from an IO port
 *
 * @param port  port number
 *
 * @returns the byte read
 */
INLINE u8_t in_u8(const u16_t port)
{
    u8_t tmp;
    /* GCC can optimize here if constant */
    __asm__ __volatile__("inb %1, %0\n"
             : "=a"(tmp)
             : "dN"(port));
    return tmp;
}

/**
 * Writes a 16bit value to an IO port
 *
 * @param port  port number
 * @param val   value
 */
INLINE void out_u16(const u16_t port, const u16_t val)
{
    /* GCC can optimize here if constant */
    __asm__ __volatile__("outw  %1, %0\n"
             :
             : "dN"(port), "a"(val));
}

/**
 * Reads a 16bit value from an IO port
 *
 * @param port  port number
 *
 * @returns the 16bit value read
 */
INLINE u16_t in_u16(const u16_t port)
{
    u16_t tmp;
    /* GCC can optimize here if constant */
    __asm__ __volatile__("inw %1, %0\n"
             : "=a"(tmp)
             : "dN"(port));
    return tmp;
};

/**
 * Writes a 32bit value to an IO port
 *
 * @param port  port number
 * @param val   value
 */
INLINE void out_u32(const u16_t port, const u32_t val)
{
    /* GCC can optimize here if constant */
    __asm__ __volatile__("outl  %1, %0\n"
             :
             : "dN"(port), "a"(val));
}

/**
 * Reads a 32bit value from an IO port
 *
 * @param port  port number
 *
 * @returns the 32bit value read
 */
INLINE u32_t in_u32(const u16_t port)
{
    u32_t tmp;
    /* GCC can optimize here if constant */
    __asm__ __volatile__("inl %1, %0\n"
             : "=a"(tmp)
             : "dN"(port));
    return tmp;
};


#endif /* __ARCH__X86__IOPORT_H__ */