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 ride bike. hack FreeBSD.--ah the good life | 703-418-2800 x346
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