text: /****************************************************************************
   * arch/x86/include/i486/io.h
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.  The
   * ASF licenses this file to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance with the
   * License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations
   * under the License.
   *
   ****************************************************************************/
  
  /* This file should never be included directly 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 Data
   ****************************************************************************/
  
  /****************************************************************************
   * 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 */
  