Date: Mon, 11 Jun 2001 15:47:47 -0700 From: Mike Smith <msmith@freebsd.org> To: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: freebsd-hackers@freebsd.org Subject: Re: Patented algorithm in FreeBSD Message-ID: <200106112247.f5BMllP03936@mass.dis.org> In-Reply-To: Your message of "Tue, 12 Jun 2001 00:27:06 %2B0200." <Pine.LNX.3.96.1010611235853.12928A-100000@artax.karlin.mff.cuni.cz>
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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). 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
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