io.c

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/*****************************************************************************************
 Copyright (c) 2002-2005 The UbixOS Project
 All rights reserved.

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 permitted provided that the following conditions are met:

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 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
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 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
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 $Id: io_8c-source.html 88 2016-01-12 00:11:29Z reddawg $

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

#include <sys/io.h>

unsigned char inportByte(unsigned int port) {
  unsigned char retVal;
  asm volatile(
    "inb %%dx,%%al"
    : "=a" (retVal)
    : "d" (port)
    );
  return(retVal);
  }

unsigned short inportWord(unsigned int port) {
  unsigned short retVal;
  asm volatile(
    "inw %%dx,%%ax"
    : "=a" (retVal)
    : "d" (port)
    );
  return(retVal);
  }

void outportByte(unsigned int port,unsigned char value) {
  asm volatile(
    "outb %%al,%%dx"
    :
    : "d" (port), "a" (value)
    );
  }

void outportByteP(unsigned int port,unsigned char value) {
  asm volatile(
    "outb %%al,%%dx\n"
    "outb %%al,$0x80\n"
    :
    : "d" (port), "a" (value)
    );
  }  

void outportWord(unsigned int port,unsigned short value) {
  asm volatile(
    "outw %%ax,%%dx"
    :
    : "d" (port), "a" (value)
    );
  }

void outportDWord(unsigned int port,unsigned long value) {
  asm volatile(
    "outl %%eax,%%dx"
    :
    : "d" (port), "a" (value)
    );
  }

unsigned long inportDWord(unsigned int port) {
  unsigned long retVal;
  asm volatile(
    "inl %%dx,%%eax"
    : "=a" (retVal)
    : "d" (port)
    );
  return(retVal);
  }

/***
 END
 ***/

---