From owner-freebsd-hackers@FreeBSD.ORG  Mon Mar 12 16:33:34 2007
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Date: Mon, 12 Mar 2007 11:33:32 -0500
From: "Michael M. Press" <deathjestr@gmail.com>
To: "Soeren Straarup" <xride@x12.dk>, 
	"ajay gopalakrishnan" <geek.dwells@gmail.com>
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	<20070312103642.GM81938@x12.dk>
Cc: freebsd-hackers@freebsd.org
Subject: Re: How does not practice freebsd kernel programming?
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You can play with adding system calls to FreeBSD. This is
not something that people need to do very often, but it is a
good way to give yourself some experience writing code that
runs in kernel mode. The following OnLamp tutorial is intended
for OpenBSD, but I think most of it applies to FreeBSD as
well:

http://www.onlamp.com/pub/a/bsd/2003/10/09/adding_system_calls.html