kernel/arch/i386/io.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /* BAD - works like inb */
  20 /*unsigned inw (unsigned short port)
  21 {
  22         unsigned char ret;
  23
  24         __asm__ __volatile__ ("inw %1,%w0"
  25                 : "=a"(ret)
  26                 : "d"(port));
  27
  28         return ret;
  29 }*/
  30
  31 void outw (unsigned port, unsigned val)
  32 {
  33         __asm__ __volatile__ ("outw %w0,%w1"
  34                 :
  35                 : "a"(val), "d"(port));
  36 }
  37
  38 void outb (unsigned port, unsigned val)
  39 {
  40         __asm__ __volatile__ ("outb %b0,%w1"
  41                 :
  42                 : "a"(val), "d"(port));
  43 }
  44
  45 unsigned inb (unsigned short port)
  46 {
  47         unsigned char ret;
  48
  49         __asm__ __volatile__ ("inb %1,%0"
  50                 : "=a"(ret)
  51                 : "d"(port));
  52
  53         return ret;
  54 }
  55
  56 void outl (unsigned short portno, unsigned long val)
  57 {
  58         __asm__ __volatile__ ("outl %0, %w1" :: "a" (val), "Nd" (portno));
  59 }
  60
  61 unsigned long inl (unsigned short portno)
  62 {
  63         unsigned long ret;
  64
  65         __asm__ __volatile__ ("inl %w1, %0" : "=a" (ret) : "Nd" (portno));
  66
  67         return ret;
  68 }