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48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/* Copyright (C) 1996-2017 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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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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/* 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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extern int ioperm (unsigned long int __from, unsigned long int __num,
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int __turn_on) __THROW;
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/* Set the I/O privilege level to LEVEL. If LEVEL is nonzero,
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permission to access any I/O port is granted. This call requires
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root privileges. */
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extern int iopl (int __level) __THROW;
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/* The functions that actually perform reads and writes. */
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extern unsigned char inb (unsigned long int __port) __THROW;
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extern unsigned short int inw (unsigned long int __port) __THROW;
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extern unsigned long int inl (unsigned long int __port) __THROW;
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extern void outb (unsigned char __value, unsigned long int __port) __THROW;
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extern void outw (unsigned short __value, unsigned long int __port) __THROW;
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extern void outl (unsigned long __value, unsigned long int __port) __THROW;
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__END_DECLS
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#endif /* _SYS_IO_H */
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