libc/x86/outportb.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 void outportb(unsigned port, unsigned val)
  21 {
  22         __asm__ __volatile__("outb %b0,%w1"
  23                 :
  24                 : "a"(val), "d"(port));
  25 }
  26
  27 void outw_p (unsigned short v, unsigned short port)
  28 {
  29         asm volatile("outw %0,%1;"
  30                      "jmp 1f;"
  31                      "1: jmp 1f;"
  32                      "1:" :: "a" (v), "dN" (port));
  33 }