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io.h

io.h 2.0 KB
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  1. /* Copyright (C) 1996, 1998, 1999 Free Software Foundation, Inc.
    2. 

  2.    This file is part of the GNU C Library.
    3. 

  3. 

  4.    The GNU C Library is free software; you can redistribute it and/or
    5. 

  5.    modify it under the terms of the GNU Lesser General Public
    6. 

  6.    License as published by the Free Software Foundation; either
    7. 

  7.    version 2.1 of the License, or (at your option) any later version.
    8. 

  8. 

  9.    The GNU C Library is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12. 

  12.    Lesser General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU Lesser General Public
    15. 

  15.    License along with the GNU C Library; if not, write to the Free
    16. 

  16.    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    17. 

  17.    02111-1307 USA.  */
    18. 

  18. 

  19. #ifndef	_SYS_IO_H
    20. 

  20. 

  21. #define	_SYS_IO_H	1
    22. 

  22. #include <features.h>
    23. 

  23. 

  24. __BEGIN_DECLS
    25. 

  25. 

  26. #if defined __UCLIBC_LINUX_SPECIFIC__
    27. 

  27. /* If TURN_ON is TRUE, request for permission to do direct i/o on the
    28. 

  28.    port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
    29. 

  29.    permission off for that range.  This call requires root privileges.  */
    30. 

  30. extern int ioperm (unsigned long int __from, unsigned long int __num,
    31. 

  31. 		   int __turn_on) __THROW;
    32. 

  32. 

  33. /* Set the I/O privilege level to LEVEL.  If LEVEL is nonzero,
    34. 

  34.    permission to access any I/O port is granted.  This call requires
    35. 

  35.    root privileges. */
    36. 

  36. extern int iopl (int __level) __THROW;
    37. 

  37. #endif /* __UCLIBC_LINUX_SPECIFIC__ */
    38. 

  38. 

  39. /* The functions that actually perform reads and writes.  */
    40. 

  40. extern unsigned char inb (unsigned long int port) __THROW;
    41. 

  41. extern unsigned short int inw (unsigned long int port) __THROW;
    42. 

  42. extern unsigned long int inl (unsigned long int port) __THROW;
    43. 

  43. 

  44. extern void outb (unsigned char value, unsigned long int port) __THROW;
    45. 

  45. extern void outw (unsigned short value, unsigned long int port) __THROW;
    46. 

  46. extern void outl (unsigned long value, unsigned long int port) __THROW;
    47. 

  47. 

  48. __END_DECLS
    49. 

  49. 

  50. #endif /* _SYS_IO_H */
    51.