Current File : //usr/include/x86_64-linux-gnu/sys/io.h
/* Copyright (C) 1996-2024 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;
#if defined __GNUC__ && __GNUC__ >= 2
static __inline unsigned char
inb (unsigned short int __port)
{
unsigned char _v;
__asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (__port));
return _v;
}
static __inline unsigned char
inb_p (unsigned short int __port)
{
unsigned char _v;
__asm__ __volatile__ ("inb %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
return _v;
}
static __inline unsigned short int
inw (unsigned short int __port)
{
unsigned short _v;
__asm__ __volatile__ ("inw %w1,%0":"=a" (_v):"Nd" (__port));
return _v;
}
static __inline unsigned short int
inw_p (unsigned short int __port)
{
unsigned short int _v;
__asm__ __volatile__ ("inw %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
return _v;
}
static __inline unsigned int
inl (unsigned short int __port)
{
unsigned int _v;
__asm__ __volatile__ ("inl %w1,%0":"=a" (_v):"Nd" (__port));
return _v;
}
static __inline unsigned int
inl_p (unsigned short int __port)
{
unsigned int _v;
__asm__ __volatile__ ("inl %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
return _v;
}
static __inline void
outb (unsigned char __value, unsigned short int __port)
{
__asm__ __volatile__ ("outb %b0,%w1": :"a" (__value), "Nd" (__port));
}
static __inline void
outb_p (unsigned char __value, unsigned short int __port)
{
__asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80": :"a" (__value),
"Nd" (__port));
}
static __inline void
outw (unsigned short int __value, unsigned short int __port)
{
__asm__ __volatile__ ("outw %w0,%w1": :"a" (__value), "Nd" (__port));
}
static __inline void
outw_p (unsigned short int __value, unsigned short int __port)
{
__asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80": :"a" (__value),
"Nd" (__port));
}
static __inline void
outl (unsigned int __value, unsigned short int __port)
{
__asm__ __volatile__ ("outl %0,%w1": :"a" (__value), "Nd" (__port));
}
static __inline void
outl_p (unsigned int __value, unsigned short int __port)
{
__asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80": :"a" (__value),
"Nd" (__port));
}
static __inline void
insb (unsigned short int __port, void *__addr, unsigned long int __count)
{
__asm__ __volatile__ ("cld ; rep ; insb":"=D" (__addr), "=c" (__count)
:"d" (__port), "0" (__addr), "1" (__count));
}
static __inline void
insw (unsigned short int __port, void *__addr, unsigned long int __count)
{
__asm__ __volatile__ ("cld ; rep ; insw":"=D" (__addr), "=c" (__count)
:"d" (__port), "0" (__addr), "1" (__count));
}
static __inline void
insl (unsigned short int __port, void *__addr, unsigned long int __count)
{
__asm__ __volatile__ ("cld ; rep ; insl":"=D" (__addr), "=c" (__count)
:"d" (__port), "0" (__addr), "1" (__count));
}
static __inline void
outsb (unsigned short int __port, const void *__addr,
unsigned long int __count)
{
__asm__ __volatile__ ("cld ; rep ; outsb":"=S" (__addr), "=c" (__count)
:"d" (__port), "0" (__addr), "1" (__count));
}
static __inline void
outsw (unsigned short int __port, const void *__addr,
unsigned long int __count)
{
__asm__ __volatile__ ("cld ; rep ; outsw":"=S" (__addr), "=c" (__count)
:"d" (__port), "0" (__addr), "1" (__count));
}
static __inline void
outsl (unsigned short int __port, const void *__addr,
unsigned long int __count)
{
__asm__ __volatile__ ("cld ; rep ; outsl":"=S" (__addr), "=c" (__count)
:"d" (__port), "0" (__addr), "1" (__count));
}
#endif /* GNU C */
__END_DECLS
#endif /* _SYS_IO_H */
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