From owner-freebsd-hackers@FreeBSD.ORG  Sun Apr 20 04:38:07 2003
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From: "Daan Vreeken [PA4DAN]" <Danovitsch@Vitsch.net>
To: rhett@alasir.com
Date: Sun, 20 Apr 2003 13:39:51 +0200
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cc: FreeBSD-hackers@FreeBSD.org
Subject: Re: low-level routines
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On Sunday 20 April 2003 04:17, RMH wrote:
> Hello gentlemen,
>
> could you point me to some function(s) used by FreeBSD to read\write va=
lues
> from\to hardware ports? I remember outp\inp (or outportb\inportb for
> Borland Turbo C) from DOS times, but these of course don't work for UNI=
X...

To read/write io ports directly on FreeBSD, you need to open /dev/io
After your process has successfully opened /dev/io you can read/write por=
ts=20
with these pieces of inline-assembly :

unsigned char inp(unsigned short Port)
{
        unsigned char   Data =3D 0;
=20
        __asm __volatile("inb %%dx,%0" : "=3Da" (Data) : "d" (Port) );
=20
        return Data;
}

void outp(unsigned short Port, unsigned char Data)
{
        unsigned char D =3D Data;
=20
        __asm __volatile("outb %0,%%dx" : : "a" (D), "d" (Port) );
}


Here's a link to some code that I use to write to the parallel port direc=
tly :
http://danovitsch.dnsq.org/cgi-bin/gpl/cat.cgi/lampd/v1.0?lampd.c

grtz,
Daan