Newer
Older
ubixos-kernel / sys / io.c
@reddawg reddawg on 13 Feb 2009 3 KB UbixOS Kernel Sources
/*****************************************************************************************
 Copyright (c) 2002-2005 The UbixOS Project
 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, the following disclaimer and the list of authors.  Redistributions in binary
 form must reproduce the above copyright notice, this list of conditions, the following
 disclaimer and the list of authors in the documentation and/or other materials provided
 with the distribution. Neither the name of the UbixOS Project 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.

 $Id$

*****************************************************************************************/

#include <sys/io.h>

/*!
 * \brief input one byte from specified port
 *
 * \param port address of port for reading
 * \return returns unsigned char value
 *
 */
unsigned char inportByte(unsigned int port) {
  unsigned char retVal;
  asm volatile(
    "inb %%dx,%%al"
    : "=a" (retVal)
    : "d" (port)
    );
  return(retVal);
  }

/*!
 * \brief input one word from specified port
 *
 * \param port address of port for reading
 * \return returns unsigned short value
 *
 */  
unsigned short inportWord(unsigned int port) {
  unsigned short retVal;
  asm volatile(
    "inw %%dx,%%ax"
    : "=a" (retVal)
    : "d" (port)
    );
  return(retVal);
  }

/*!
 * \brief outputut one byte to specified port
 *
 * \param port address of port for writing
 * \param value byte to output to port
 *
 */
void outportByte(unsigned int port,unsigned char value) {
  asm volatile(
    "outb %%al,%%dx"
    :
    : "d" (port), "a" (value)
    );
  }

/*!
 * \brief outputut one byte to specified port with a delay
 *
 * \param port address of port for writing
 * \param value byte to output to port
 *
 */
void outportByteP(unsigned int port,unsigned char value) {
  asm volatile(
    "outb %%al,%%dx\n"
    "outb %%al,$0x80\n"
    :
    : "d" (port), "a" (value)
    );
  }  

/*!
 * \brief outputut one word to specified port
 *
 * \param port address of port for writing
 * \param value word to output to port
 *
 */
void outportWord(unsigned int port,unsigned short value) {
  asm volatile(
    "outw %%ax,%%dx"
    :
    : "d" (port), "a" (value)
    );
  }

/*!
 * \brief outputut one double word to specified port
 *
 * \param port address of port for writing
 * \param value double word to output to port
 *
 */
void outportDWord(unsigned int port,unsigned long value) {
  asm volatile(
    "outl %%eax,%%dx"
    :
    : "d" (port), "a" (value)
    );
  }

/*!
 * \brief input one double word from specified port
 *
 * \param port address of port for reading
 * \return returns unsigned double word value
 *
 */
unsigned long inportDWord(unsigned int port) {
  unsigned long retVal;
  asm volatile(
    "inl %%dx,%%eax"
    : "=a" (retVal)
    : "d" (port)
    );
  return(retVal);
  }

/***
 END
 ***/