Date: Tue, 8 Aug 1995 13:29:15 -0400 (EDT) From: "Jonathan M. Bresler" <jmb@kryten.Atinc.COM> To: Robin Hunt <ROBIN@ptnsct.nis.za> Cc: questions@freebsd.org Subject: Re: Accessing i/o map space with freebsd 2.1.0 Message-ID: <Pine.3.89.9508081334.C13865-0100000@kryten.atinc.com> In-Reply-To: <950808145946.94e1@ptnsct.nis.za>
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On Tue, 8 Aug 1995, Robin Hunt wrote:
> 1) Is it required that I write I driver
no.
> 2) If not, how can I use outb / inb without creating a bus error?
open /dev/io.
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <machine/cpufunc.h>
#include "if_smcreg.h"
int
main(int argc, char *argv[]) {
if ( open("/dev/io", O_RDONLY, 0 ) != -1 ) {
outw( 0x300 + BSR, BANK_2 );
outw( 0x300 + MMUCR, RESET_MMU); /* XXX need to delay
here ? */
} else
perror("");
return -1;
}
bizarre how O_RDONLY lets you write as well ;0
Jonathan M. Bresler jmb@kryten.atinc.com | Analysis & Technology, Inc.
FreeBSD Postmaster jmb@FreeBSD.Org | 2341 Jeff Davis Hwy
play go. | Arlington, VA 22202
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