nuttx/arch/x86/include/i486/io.h

/****************************************************************************
 * arch/x86/include/i486/io.h
 * arch/chip/io.h
 *
 *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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.
 * 3. Neither the name NuttX 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.
 *
 ****************************************************************************/

/* This file should never be included directed but, rather, only indirectly
 * through arch/io.h
 */

#ifndef __ARCH_X86_INCLUDE_I486_IO_H
#define __ARCH_X86_INCLUDE_I486_IO_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <stdint.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Public Types
 ****************************************************************************/

#ifndef __ASSEMBLY__

/****************************************************************************
 * Inline functions
 ****************************************************************************/

/* Standard x86 Port I/O */

static inline void outb(uint8_t regval, uint16_t port)
{
  asm volatile(
    "\toutb %0,%1\n"
    :
    : "a" (regval), "dN" (port)
    );
}

static inline uint8_t inb(uint16_t port)
{
  uint8_t regval;
  asm volatile(
    "\tinb %1,%0\n"
    : "=a" (regval)
    : "dN" (port)
  );
  return regval;
}

static inline void outw(uint16_t regval, uint16_t port)
{
  asm volatile(
    "\toutw %0,%1\n"
    :
    : "a" (regval), "dN" (port)
    );
}

static inline uint16_t inw(uint16_t port)
{
  uint16_t regval;

  asm volatile(
    "\tinw %1,%0\n"
    : "=a" (regval)
    : "dN" (port)
    );
  return regval;
}

static inline void outl(uint32_t regval, uint16_t port)
{
  asm volatile(
    "\toutl %0,%1\n"
    :
    : "a" (regval), "dN" (port)
    );
}

static inline uint32_t inl(uint16_t port)
{
  uint32_t regval;
  asm volatile(
    "\tinl %1,%0\n"
    : "=a" (regval)
    : "dN" (port)
    );
  return regval;
}

/****************************************************************************
 * Public Variables
 ****************************************************************************/

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

#undef EXTERN
#ifdef __cplusplus
}
#endif

#endif /* __ASSEMBLY__ */
#endif /* __ARCH_X86_INCLUDE_I486_IO_H */