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

   1 /* Copyright (C) 1996, 1999 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 /* 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
  30    Portability note: not all Linux platforms support this call.  Most
  31    platforms based on the PC I/O architecture probably will, however.
  32    E.g., Linux/Alpha for Alpha PCs supports this.  */
  33 extern int ioperm (unsigned long int __from, unsigned long int __num,
  34                    int __turn_on) __THROW;
  35
  36 /* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
  37    access any I/O port is granted.  This call requires root
  38    privileges. */
  39 extern int iopl (int __level) __THROW;
  40
  41 /* Return the physical address of the DENSE I/O memory or NULL if none
  42    is available (e.g. on a jensen).  */
  43 extern unsigned long int _bus_base (void) __THROW __attribute__ ((const));
  44 extern unsigned long int bus_base (void) __THROW __attribute__ ((const));
  45
  46 /* Return the physical address of the SPARSE I/O memory.  */
  47 extern unsigned long _bus_base_sparse (void) __THROW __attribute__ ((const));
  48 extern unsigned long bus_base_sparse (void) __THROW __attribute__ ((const));
  49
  50 /* Return the HAE shift used by the SPARSE I/O memory.  */
  51 extern int _hae_shift (void) __THROW __attribute__ ((const));
  52 extern int hae_shift (void) __THROW __attribute__ ((const));
  53
  54 /* Access PCI space protected from machine checks.  */
  55 extern int pciconfig_read (unsigned long int __bus,
  56                            unsigned long int __dfn,
  57                            unsigned long int __off,
  58                            unsigned long int __len,
  59                            unsigned char *__buf) __THROW;
  60
  61 extern int pciconfig_write (unsigned long int __bus,
  62                             unsigned long int __dfn,
  63                             unsigned long int __off,
  64                             unsigned long int __len,
  65                             unsigned char *__buf) __THROW;
  66
  67 __END_DECLS
  68
  69 #endif /* _SYS_IO_H */