sysdeps/unix/sysv/linux/sys/io.h

   1 /* Copyright (C) 1996 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _SYS_IO_H
  20
  21 #define _SYS_IO_H       1
  22 #include <features.h>
  23
  24 __BEGIN_DECLS
  25
  26 /* Get constants from kernel header files. */
  27 #include <asm/io.h>
  28
  29 /* If TURN_ON is TRUE, request for permission to do direct i/o on the
  30    port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
  31    permission off for that range.  This call requires root privileges.
  32
  33    Portability note: not all Linux platforms support this call.  Most
  34    platforms based on the PC I/O architecture probably will, however.
  35    E.g., Linux/Alpha for Alpha PCs supports this.  */
  36 extern int ioperm __P ((unsigned long int __from, unsigned long int __num,
  37                         int __turn_on));
  38
  39 /* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
  40    access any I/O port is granted.  This call requires root
  41    privileges. */
  42 extern int iopl __P ((int __level));
  43
  44 __END_DECLS
  45
  46 #endif /* _SYS_IO_H */