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 Message-ID: <20000531192931.Q99925@strontium.scientia.demon.co.uk> In-Reply-To: <200005311747.SAA19114@ngo.org.uk> References: <200005311747.SAA19114@ngo.org.uk>
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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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