1 /* Copyright (C) 1999-2022 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, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_IO_H 19 #define _SYS_IO_H 1 20 21 #include <features.h> 22 23 __BEGIN_DECLS 24 25 /* If TURN_ON is TRUE, request for permission to do direct i/o on the 26 port numbers in the range [FROM,FROM+NUM-1]. Otherwise, turn I/O 27 permission off for that range. This call requires root privileges. 28 29 Portability note: not all Linux platforms support this call. Most 30 platforms based on the PC I/O architecture probably will, however. 31 E.g., Linux/Alpha for Alpha PCs supports this. */ 32 extern int ioperm (unsigned long int __from, unsigned long int __num, 33 int __turn_on); 34 35 /* Set the I/O privilege level to LEVEL. If LEVEL>3, permission to 36 access any I/O port is granted. This call requires root 37 privileges. */ 38 extern int iopl (int __level); 39 40 extern unsigned int _inb (unsigned long int __port); 41 extern unsigned int _inb (unsigned long int __port); 42 extern unsigned int _inw (unsigned long int __port); 43 extern unsigned int _inl (unsigned long int __port); 44 extern void _outb (unsigned char __val, unsigned long int __port); 45 extern void _outw (unsigned short __val, unsigned long int __port); 46 extern void _outl (unsigned int __val, unsigned long int __port); 47 48 #define inb _inb 49 #define inw _inw 50 #define inl _inl 51 #define outb _outb 52 #define outw _outw 53 #define outl _outl 54 55 /* Access PCI space protected from machine checks. */ 56 extern int pciconfig_read (unsigned long int __bus, unsigned long int __dfn, 57 unsigned long int __off, unsigned long int __len, 58 unsigned char *__buf); 59 60 extern int pciconfig_write (unsigned long int __bus, unsigned long int __dfn, 61 unsigned long int __off, unsigned long int __len, 62 unsigned char *__buf); 63 64 __END_DECLS 65 66 #endif /* _SYS_IO_H */ 67