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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _SYS_IO_H

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#define _SYS_IO_H 1

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#include <features.h>

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__BEGIN_DECLS

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/* If TURN_ON is TRUE, request for permission to do direct i/o on the

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port numbers in the range [FROM,FROM+NUM-1]. Otherwise, turn I/O

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permission off for that range. This call requires root privileges.

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Portability note: not all Linux platforms support this call. Most

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platforms based on the PC I/O architecture probably will, however.

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E.g., Linux/Alpha for Alpha PCs supports this. */

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extern int ioperm (unsigned long int __from, unsigned long int __num,

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int __turn_on) __THROW;

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/* Set the I/O privilege level to LEVEL. If LEVEL>3, permission to

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access any I/O port is granted. This call requires root

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privileges. */

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extern int iopl (int __level) __THROW;

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#if defined __GNUC__ && __GNUC__ >= 2

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static __inline unsigned char

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inb (unsigned short int __port)

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{

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unsigned char _v;

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__asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (__port));

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return _v;

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}

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static __inline unsigned char

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inb_p (unsigned short int __port)

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{

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unsigned char _v;

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__asm__ __volatile__ ("inb %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));

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return _v;

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}

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static __inline unsigned short int

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inw (unsigned short int __port)

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{

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unsigned short _v;

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__asm__ __volatile__ ("inw %w1,%0":"=a" (_v):"Nd" (__port));

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return _v;

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}

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static __inline unsigned short int

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inw_p (unsigned short int __port)

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{

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unsigned short int _v;

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__asm__ __volatile__ ("inw %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));

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return _v;

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}

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static __inline unsigned int

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inl (unsigned short int __port)

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{

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unsigned int _v;

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__asm__ __volatile__ ("inl %w1,%0":"=a" (_v):"Nd" (__port));

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return _v;

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}

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static __inline unsigned int

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inl_p (unsigned short int __port)

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{

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unsigned int _v;

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__asm__ __volatile__ ("inl %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));

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return _v;

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}

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static __inline void

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outb (unsigned char __value, unsigned short int __port)

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{

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__asm__ __volatile__ ("outb %b0,%w1": :"a" (__value), "Nd" (__port));

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}

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static __inline void

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outb_p (unsigned char __value, unsigned short int __port)

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{

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__asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80": :"a" (__value),

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"Nd" (__port));

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}

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static __inline void

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outw (unsigned short int __value, unsigned short int __port)

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{

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__asm__ __volatile__ ("outw %w0,%w1": :"a" (__value), "Nd" (__port));

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}

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static __inline void

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outw_p (unsigned short int __value, unsigned short int __port)

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{

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__asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80": :"a" (__value),

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"Nd" (__port));

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}

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static __inline void

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outl (unsigned int __value, unsigned short int __port)

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{

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__asm__ __volatile__ ("outl %0,%w1": :"a" (__value), "Nd" (__port));

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}

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static __inline void

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outl_p (unsigned int __value, unsigned short int __port)

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{

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__asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80": :"a" (__value),

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"Nd" (__port));

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}

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static __inline void

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insb (unsigned short int __port, void *__addr, unsigned long int __count)

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{

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__asm__ __volatile__ ("cld ; rep ; insb":"=D" (__addr), "=c" (__count)

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:"d" (__port), "0" (__addr), "1" (__count));

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}

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static __inline void

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insw (unsigned short int __port, void *__addr, unsigned long int __count)

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{

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__asm__ __volatile__ ("cld ; rep ; insw":"=D" (__addr), "=c" (__count)

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:"d" (__port), "0" (__addr), "1" (__count));

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}

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static __inline void

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insl (unsigned short int __port, void *__addr, unsigned long int __count)

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{

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__asm__ __volatile__ ("cld ; rep ; insl":"=D" (__addr), "=c" (__count)

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:"d" (__port), "0" (__addr), "1" (__count));

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}

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static __inline void

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outsb (unsigned short int __port, const void *__addr,

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unsigned long int __count)

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{

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__asm__ __volatile__ ("cld ; rep ; outsb":"=S" (__addr), "=c" (__count)

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:"d" (__port), "0" (__addr), "1" (__count));

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}

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static __inline void

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outsw (unsigned short int __port, const void *__addr,

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unsigned long int __count)

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{

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__asm__ __volatile__ ("cld ; rep ; outsw":"=S" (__addr), "=c" (__count)

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:"d" (__port), "0" (__addr), "1" (__count));

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}

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static __inline void

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outsl (unsigned short int __port, const void *__addr,

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unsigned long int __count)

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{

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__asm__ __volatile__ ("cld ; rep ; outsl":"=S" (__addr), "=c" (__count)

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:"d" (__port), "0" (__addr), "1" (__count));

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}

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#endif /* GNU C */

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__END_DECLS

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#endif /* _SYS_IO_H */

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