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/* Copyright (C) 1996-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#ifndef _SYS_IO_H
#define _SYS_IO_H 1
#include <features.h>
__BEGIN_DECLS
/* If TURN_ON is TRUE, request for permission to do direct i/o on the
port numbers in the range [FROM,FROM+NUM-1]. Otherwise, turn I/O
permission off for that range. This call requires root privileges.
Portability note: not all Linux platforms support this call. Most
platforms based on the PC I/O architecture probably will, however.
E.g., Linux/Alpha for Alpha PCs supports this. */
extern int ioperm (unsigned long int __from, unsigned long int __num,
int __turn_on) __THROW;
/* Set the I/O privilege level to LEVEL. If LEVEL>3, permission to
access any I/O port is granted. This call requires root
privileges. */
extern int iopl (int __level) __THROW;
/* Return the physical address of the DENSE I/O memory or NULL if none
is available (e.g. on a jensen). */
extern unsigned long int _bus_base (void) __THROW __attribute__ ((const));
extern unsigned long int bus_base (void) __THROW __attribute__ ((const));
/* Return the physical address of the SPARSE I/O memory. */
extern unsigned long _bus_base_sparse (void) __THROW __attribute__ ((const));
extern unsigned long bus_base_sparse (void) __THROW __attribute__ ((const));
/* Return the HAE shift used by the SPARSE I/O memory. */
extern int _hae_shift (void) __THROW __attribute__ ((const));
extern int hae_shift (void) __THROW __attribute__ ((const));
/* Previous three are deprecated in favour of the following, which
knows about multiple PCI "hoses". Provide the PCI bus and dfn
numbers just as to pciconfig_read/write. */
enum __pciconfig_iobase_which
{
IOBASE_HOSE = 0, /* Return hose index. */
IOBASE_SPARSE_MEM = 1, /* Return physical memory addresses. */
IOBASE_DENSE_MEM = 2,
IOBASE_SPARSE_IO = 3,
IOBASE_DENSE_IO = 4
};
extern long pciconfig_iobase(enum __pciconfig_iobase_which __which,
unsigned long int __bus,
unsigned long int __dfn)
__THROW __attribute__ ((const));
/* Access PCI space protected from machine checks. */
extern int pciconfig_read (unsigned long int __bus,
unsigned long int __dfn,
unsigned long int __off,
unsigned long int __len,
unsigned char *__buf) __THROW;
extern int pciconfig_write (unsigned long int __bus,
unsigned long int __dfn,
unsigned long int __off,
unsigned long int __len,
unsigned char *__buf) __THROW;
/* Userspace declarations. */
extern unsigned int inb (unsigned long __port) __THROW;
extern unsigned int inw (unsigned long __port) __THROW;
extern unsigned int inl (unsigned long __port) __THROW;
extern void outb (unsigned char __b, unsigned long __port) __THROW;
extern void outw (unsigned short __w, unsigned long __port) __THROW;
extern void outl (unsigned int __l, unsigned long __port) __THROW;
__END_DECLS
#endif /* _SYS_IO_H */
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