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1/* Copyright (C) 1996-2024 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. */
32extern 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. */
38extern 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). */
42extern unsigned long int _bus_base (void) __THROW __attribute__ ((const));
43extern unsigned long int bus_base (void) __THROW __attribute__ ((const));
44
45/* Return the physical address of the SPARSE I/O memory. */
46extern unsigned long _bus_base_sparse (void) __THROW __attribute__ ((const));
47extern unsigned long bus_base_sparse (void) __THROW __attribute__ ((const));
48
49/* Return the HAE shift used by the SPARSE I/O memory. */
50extern int _hae_shift (void) __THROW __attribute__ ((const));
51extern 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
57enum __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
66extern 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. */
72extern 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
78extern 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. */
85extern unsigned int inb (unsigned long __port) __THROW;
86extern unsigned int inw (unsigned long __port) __THROW;
87extern unsigned int inl (unsigned long __port) __THROW;
88extern void outb (unsigned char __b, unsigned long __port) __THROW;
89extern void outw (unsigned short __w, unsigned long __port) __THROW;
90extern void outl (unsigned int __l, unsigned long __port) __THROW;
91
92__END_DECLS
93
94#endif /* _SYS_IO_H */
95

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source code of glibc/sysdeps/unix/sysv/linux/alpha/sys/io.h