1 /* Copyright (C) 1996-2021 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 20 #define _SYS_IO_H 1 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) __THROW; 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) __THROW; 39 40 /* Return the physical address of the DENSE I/O memory or NULL if none 41 is available (e.g. on a jensen). */ 42 extern unsigned long int _bus_base (void) __THROW __attribute__ ((const)); 43 extern unsigned long int bus_base (void) __THROW __attribute__ ((const)); 44 45 /* Return the physical address of the SPARSE I/O memory. */ 46 extern unsigned long _bus_base_sparse (void) __THROW __attribute__ ((const)); 47 extern unsigned long bus_base_sparse (void) __THROW __attribute__ ((const)); 48 49 /* Return the HAE shift used by the SPARSE I/O memory. */ 50 extern int _hae_shift (void) __THROW __attribute__ ((const)); 51 extern int hae_shift (void) __THROW __attribute__ ((const)); 52 53 /* Previous three are deprecated in favour of the following, which 54 knows about multiple PCI "hoses". Provide the PCI bus and dfn 55 numbers just as to pciconfig_read/write. */ 56 57 enum __pciconfig_iobase_which 58 { 59 IOBASE_HOSE = 0, /* Return hose index. */ 60 IOBASE_SPARSE_MEM = 1, /* Return physical memory addresses. */ 61 IOBASE_DENSE_MEM = 2, 62 IOBASE_SPARSE_IO = 3, 63 IOBASE_DENSE_IO = 4 64 }; 65 66 extern long pciconfig_iobase(enum __pciconfig_iobase_which __which, 67 unsigned long int __bus, 68 unsigned long int __dfn) 69 __THROW __attribute__ ((const)); 70 71 /* Access PCI space protected from machine checks. */ 72 extern int pciconfig_read (unsigned long int __bus, 73 unsigned long int __dfn, 74 unsigned long int __off, 75 unsigned long int __len, 76 unsigned char *__buf) __THROW; 77 78 extern int pciconfig_write (unsigned long int __bus, 79 unsigned long int __dfn, 80 unsigned long int __off, 81 unsigned long int __len, 82 unsigned char *__buf) __THROW; 83 84 /* Userspace declarations. */ 85 extern unsigned int inb (unsigned long __port) __THROW; 86 extern unsigned int inw (unsigned long __port) __THROW; 87 extern unsigned int inl (unsigned long __port) __THROW; 88 extern void outb (unsigned char __b, unsigned long __port) __THROW; 89 extern void outw (unsigned short __w, unsigned long __port) __THROW; 90 extern void outl (unsigned int __l, unsigned long __port) __THROW; 91 92 __END_DECLS 93 94 #endif /* _SYS_IO_H */ 95