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 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
  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 /* Previous three are deprecated in favour of the following, which
  55    knows about multiple PCI "hoses".  Provide the PCI bus and dfn
  56    numbers just as to pciconfig_read/write.  */
  57
  58 enum __pciconfig_iobase_which
  59 {
  60   IOBASE_HOSE = 0,              /* Return hose index. */
  61   IOBASE_SPARSE_MEM = 1,        /* Return physical memory addresses.  */
  62   IOBASE_DENSE_MEM = 2,
  63   IOBASE_SPARSE_IO = 3,
  64   IOBASE_DENSE_IO = 4
  65 };
  66
  67 extern long pciconfig_iobase(enum __pciconfig_iobase_which __which,
  68                              unsigned long int __bus,
  69                              unsigned long int __dfn)
  70      __THROW __attribute__ ((const));
  71
  72 /* Access PCI space protected from machine checks.  */
  73 extern int pciconfig_read (unsigned long int __bus,
  74                            unsigned long int __dfn,
  75                            unsigned long int __off,
  76                            unsigned long int __len,
  77                            unsigned char *__buf) __THROW;
  78
  79 extern int pciconfig_write (unsigned long int __bus,
  80                             unsigned long int __dfn,
  81                             unsigned long int __off,
  82                             unsigned long int __len,
  83                             unsigned char *__buf) __THROW;
  84
  85 /* Userspace declarations.  */
  86 extern unsigned int inb (unsigned long __port) __THROW;
  87 extern unsigned int inw (unsigned long __port) __THROW;
  88 extern unsigned int inl (unsigned long __port) __THROW;
  89 extern void outb (unsigned char __b, unsigned long __port) __THROW;
  90 extern void outw (unsigned short __w, unsigned long __port) __THROW;
  91 extern void outl (unsigned int __l, unsigned long __port) __THROW;
  92
  93 __END_DECLS
  94
  95 #endif /* _SYS_IO_H */