text: /* -*- Mode: C; c-basic-offset: 3 -*-
   *
   * io.h - Simple IA32 I/O macros
   *
   * This file is part of Metalkit, a simple collection of modules for
   * writing software that runs on the bare metal. Get the latest code
   * at http://svn.navi.cx/misc/trunk/metalkit/
   *
   * Copyright (c) 2008-2009 Micah Elizabeth Scott
   *
   * Permission is hereby granted, free of charge, to any person
   * obtaining a copy of this software and associated documentation
   * files (the "Software"), to deal in the Software without
   * restriction, including without limitation the rights to use,
   * copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following
   * conditions:
   *
   * The above copyright notice and this permission notice shall be
   * included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
   * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
   * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef __IO_H__
  #define __IO_H__
  
  #include "types.h"
  
  static __inline__ void
  IO_Out8(uint16 port, uint8 value)
  {
     __asm__ __volatile__ ("outb %0, %1" : :"a" (value), "d" (port));
  }
  
  static __inline__ void
  IO_Out16(uint16 port, uint16 value)
  {
     __asm__ __volatile__ ("outw %0, %1" : :"a" (value), "d" (port));
  }
  
  static __inline__ void
  IO_Out32(uint16 port, uint32 value)
  {
     __asm__ __volatile__ ("outl %0, %1" : :"a" (value), "d" (port));
  }
  
  static __inline__ uint8
  IO_In8(uint16 port)
  {
     uint8 value;
     __asm__ __volatile__ ("inb %1, %0" :"=a" (value) :"d" (port));
     return value;
  }
  
  static __inline__ uint16
  IO_In16(uint16 port)
  {
     uint16 value;
     __asm__ __volatile__ ("inw %1, %0" :"=a" (value) :"d" (port));
     return value;
  }
  
  static __inline__ uint32
  IO_In32(uint16 port)
  {
     uint32 value;
     __asm__ __volatile__ ("inl %1, %0" :"=a" (value) :"d" (port));
     return value;
  }
  
  #endif /* __IO_H__ */
  