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

   1 /* Copyright (C) 1996, 1998, 1999, 2000 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    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 /* If TURN_ON is TRUE, request for permission to do direct i/o on the
  27    port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
  28    permission off for that range.  This call requires root privileges.  */
  29 extern int ioperm (unsigned long int __from, unsigned long int __num,
  30                    int __turn_on) __THROW;
  31
  32 /* Set the I/O privilege level to LEVEL.  If LEVEL is nonzero,
  33    permission to access any I/O port is granted.  This call requires
  34    root privileges. */
  35 extern int iopl (int __level) __THROW;
  36
  37 /* The functions that actually perform reads and writes.  */
  38 extern unsigned char inb (unsigned long int port) __THROW;
  39 extern unsigned short int inw (unsigned long int port) __THROW;
  40 extern unsigned long int inl (unsigned long int port) __THROW;
  41
  42 extern void outb (unsigned char value, unsigned long int port) __THROW;
  43 extern void outw (unsigned short value, unsigned long int port) __THROW;
  44 extern void outl (unsigned long value, unsigned long int port) __THROW;
  45
  46 __END_DECLS
  47
  48 #endif /* _SYS_IO_H */