Date: Fri, 19 Apr 1996 10:01:06 -0400 (EDT) From: Sujal Patel <smpatel@umiacs.umd.edu> To: Hollerer <eeg@telecom.at> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: How can I read/write from/to an I/O-port? Message-ID: <Pine.NEB.3.92.960419095909.1260C-100000@xi.dorm.umd.edu> In-Reply-To: <317764B2.6DCC0261@telecom.at>
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On Fri, 19 Apr 1996, Hollerer wrote:
> Under Linux a /dev/port exits to write/read to/from an I/O-port.
> Does a similar /dev/??? exits under FreeBSD or must I write
> a little device driver for this?
After you open /dev/io as read-only, you can then use inb & outb from
machine/cpufunc.h--
#include <stdio.h>
#include <sys/fcntl.h>
#include <machine/cpufunc.h>
main()
{
open ("/dev/io", O_RDONLY);
outb (0x3f8, 0xff);
}
Sujal
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