From owner-freebsd-questions  Wed May 31 11:37:58 2000
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Date: Wed, 31 May 2000 19:29:31 +0100
From: Ben Smithurst <ben@scientia.demon.co.uk>
To: Mac <mac@ngo.org.uk>
Cc: freebsd-questions@freebsd.org
Subject: Re: Writing a value to an IO (mem mapped) port
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Mac wrote:

> However under FreeBSD, although the function seems to exist to do this
> in /usr/include/machine/cpufunc.h, I get Bus Errors every time I try.
> 
> fred.c looks like this:-
> 
> 	#include <sys/types.h>
> 	#include <machine/cpufunc.h>
> 
> 	main()
> 	{
> 	 outb(0x181,0)
> 	}
> 
> And compiles OKay.

"man i386_set_ioperm" might help you.  I'm guessing you'll want to call

i386_set_ioperm(0x181, 1, 1);

before the call to outb(), but as I've never used this function I can't
be sure exactly.

-- 
Ben Smithurst / ben@scientia.demon.co.uk / PGP: 0x99392F7D


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