From owner-freebsd-hackers@FreeBSD.ORG  Mon Feb 14 16:14:35 2011
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Date: Mon, 14 Feb 2011 11:14:23 -0500
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From: Ryan Stone <rysto32@gmail.com>
To: beezarliu <beezarliu@yahoo.com.cn>
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>
Subject: Re: map share memory to kernel space
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Is your goal just to share memory between userland applications and
the kernel?  Can the kernel allocate the memory?  If so, the easiest
way to share memory would be to create a device under /dev and have
the userland application mmap it.