Date: Sun, 14 Dec 1997 00:02:57 -0800 (PST) From: Jason Evans <jasone@canonware.com> To: "John S. Dyson" <dyson@freebsd.org> Cc: Terry Lambert <tlambert@primenet.com>, jkh@time.cdrom.com, freebsd-hackers@freebsd.org Subject: Re: Beginning SPARC port Message-ID: <Pine.LNX.3.95.971212181607.545G-100000@paladio> In-Reply-To: <199712130043.TAA03452@dyson.iquest.net>
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On Fri, 12 Dec 1997, John S. Dyson wrote: > I don't have a Sparc manual yet, but it is likely that if you want a > referenced bit, you have to emulate it. If you don't want to emulate > it, I can add about 20 or so lines of code to the upper level VM so > that it isn't needed for now. (Actually, it is likely that the referenced > bit managment isn't needed, for a 1st pass -- get it working -- port.) You're right, there is no explicit referenced bit. There are 13 extra bits available though. Will we need any of them for anything else (13 sounds like plenty)? > I wouldn't try to make the port "perfect" in the first pass, but once > it is sort-of running, it will be easier for more people to work on it. I think this needs to be the attitude all the way around on the initial pass. The UltraSPARC has tons of features that, if used correctly, provide incredible performance gains. First, it just needs to work though. Jason Jason Evans Email: [jasone@canonware.com] Home phone: [(650) 856-8204] Quote: ["Invention is 1% inspiration, 99% perspiration" - Thomas Edison]
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