From owner-freebsd-hackers@FreeBSD.ORG  Mon Mar 27 23:37:48 2006
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Date: Mon, 27 Mar 2006 16:37:47 -0700 (MST)
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To: ederbsd@gmail.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Direct access to hadware
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In message: <9dd63e580603271523p2571f66cye1230815de021bd1@mail.gmail.com>
            Eder <ederbsd@gmail.com> writes:
: I would like to know if exite some header ".h" in FreeBSD so
: that I can make a direct access to hadware in machine with C.

Yes.  There is.  However, without knowing what you want to do, it is
impossible to recommend which one of the many .h files can enable this
functionality.  What's your hardware look like that you wish to get
access to.  One caveat: unless you have a driver, you can't have a
interrupt.

Warner