From owner-freebsd-hackers Mon Jun 11 15:37:37 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from mass.dis.org (mass.dis.org [216.240.45.41]) by hub.freebsd.org (Postfix) with ESMTP id 8E90637B403 for ; Mon, 11 Jun 2001 15:37:28 -0700 (PDT) (envelope-from msmith@mass.dis.org) Received: from mass.dis.org (localhost [127.0.0.1]) by mass.dis.org (8.11.3/8.11.3) with ESMTP id f5BMllP03936; Mon, 11 Jun 2001 15:47:47 -0700 (PDT) (envelope-from msmith@mass.dis.org) Message-Id: <200106112247.f5BMllP03936@mass.dis.org> X-Mailer: exmh version 2.1.1 10/15/1999 To: Mikulas Patocka Cc: freebsd-hackers@freebsd.org Subject: Re: Patented algorithm in FreeBSD In-reply-to: Your message of "Tue, 12 Jun 2001 00:27:06 +0200." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 11 Jun 2001 15:47:47 -0700 From: Mike Smith Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > 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). It'd be hard to build a case on this patent, though; since it was granted in 1996, and the technique is as old as the hills, proving prior art would probably be relatively straightforward. -- ... every activity meets with opposition, everyone who acts has his rivals and unfortunately opponents also. But not because people want to be opponents, rather because the tasks and relationships force people to take different points of view. [Dr. Fritz Todt] V I C T O R Y N O T V E N G E A N C E To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message