From owner-freebsd-hackers  Mon Jun 11 15:27: 7 2001
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Date: Tue, 12 Jun 2001 00:27:06 +0200 (CEST)
From: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
To: freebsd-hackers@freebsd.org
Subject: Patented algorithm in FreeBSD
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Hi

Go to http://www.uspto.gov/patft/, search for patent number 5873127, and
you will find the description of mapping page table entries into virtual
memory via one page directory entry pointing to the page directory itself
- exactly what FreeBSD does with PTDPTDI and APTDPTDI entries on i386.
(including using alternate space as in get_ptbase() in i386/pmap.c to
access page table entries of different processes).

Mikulas


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