libc/x86/inportb.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   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
  20 unsigned inportb (unsigned short port)
  21 {
  22         unsigned char ret_val;
  23
  24         __asm__ __volatile__("inb %1,%0"
  25                 : "=a"(ret_val)
  26                 : "d"(port));
  27         return ret_val;
  28 }
  29
  30 unsigned short inw (unsigned short port)
  31 {
  32         unsigned short v;
  33         asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
  34         return v;
  35 }