iopl.c

来自「ucLinux is a very good embeded sytem. Mo」· C语言 代码 · 共 36 行

/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Phil Blundell, based on the Alpha version by
   David Mosberger.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <sys/io.h>
#include <errno.h>

#define MAX_PORT	0x10000

int iopl(int level) 
{
	if (level > 3) {
		__set_errno(EINVAL);
		return -1;
	}
	if (level)
		return ioperm(0, MAX_PORT, 1);
	return 0;
}