io.h 1.9 KB

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  1. /* Copyright (C) 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #ifndef _SYS_IO_H
  16. #define _SYS_IO_H 1
  17. #include <features.h>
  18. __BEGIN_DECLS
  19. /* If TURN_ON is TRUE, request for permission to do direct i/o on the
  20. port numbers in the range [FROM,FROM+NUM-1]. Otherwise, turn I/O
  21. permission off for that range. This call requires root privileges. */
  22. extern int ioperm (unsigned long int __from, unsigned long int __num,
  23. int __turn_on) __THROW;
  24. /* Set the I/O privilege level to LEVEL. If LEVEL is nonzero,
  25. permission to access any I/O port is granted. This call requires
  26. root privileges. */
  27. extern int iopl (int __level) __THROW;
  28. /* The functions that actually perform reads and writes. */
  29. extern unsigned char inb (unsigned long int port) __THROW;
  30. extern unsigned short int inw (unsigned long int port) __THROW;
  31. extern unsigned long int inl (unsigned long int port) __THROW;
  32. extern void outb (unsigned char value, unsigned long int port) __THROW;
  33. extern void outw (unsigned short value, unsigned long int port) __THROW;
  34. extern void outl (unsigned long value, unsigned long int port) __THROW;
  35. __END_DECLS
  36. #endif /* _SYS_IO_H */