1 /* Copyright (C) 1996, 1998, 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 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 */ 49