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/* Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifndef _SYS_IO_H
#define _SYS_IO_H 1
#include <features.h>
__BEGIN_DECLS
/* Get constants from kernel header files. */
#include <asm/io.h>
/* If TURN_ON is TRUE, request for permission to do direct i/o on the
port numbers in the range [FROM,FROM+NUM-1]. Otherwise, turn I/O
permission off for that range. This call requires root privileges.
Portability note: not all Linux platforms support this call. Most
platforms based on the PC I/O architecture probably will, however.
E.g., Linux/Alpha for Alpha PCs supports this. */
extern int ioperm __P ((unsigned long int __from, unsigned long int __num,
int __turn_on));
/* Set the I/O privilege level to LEVEL. If LEVEL>3, permission to
access any I/O port is granted. This call requires root
privileges. */
extern int iopl __P ((int __level));
__END_DECLS
#endif /* _SYS_IO_H */
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