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47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/* Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _SYS_IO_H
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#define _SYS_IO_H 1
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#include <features.h>
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__BEGIN_DECLS
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/* Get constants from kernel header files. */
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#include <asm/io.h>
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/* If TURN_ON is TRUE, request for permission to do direct i/o on the
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port numbers in the range [FROM,FROM+NUM-1]. Otherwise, turn I/O
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permission off for that range. This call requires root privileges.
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Portability note: not all Linux platforms support this call. Most
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platforms based on the PC I/O architecture probably will, however.
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E.g., Linux/Alpha for Alpha PCs supports this. */
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extern int ioperm __P ((unsigned long int __from, unsigned long int __num,
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int __turn_on));
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/* Set the I/O privilege level to LEVEL. If LEVEL>3, permission to
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access any I/O port is granted. This call requires root
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privileges. */
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extern int iopl __P ((int __level));
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__END_DECLS
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#endif /* _SYS_IO_H */
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