Date: Thu, 17 Nov 2005 15:04:36 -0500 From: Chuck Swiger <cswiger@mac.com> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-questions@freebsd.org Subject: Re: EM64T supported? Message-ID: <437CE254.3080701@mac.com> In-Reply-To: <20051117150323.U1019@ganymede.hub.org> References: <20051117150323.U1019@ganymede.hub.org>
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Marc G. Fournier wrote: > First off, what is it? On 32bit platforms, to address >4G of RAM, I > recall that there is some sort of 'paging' that has to be done to > address it ... does EM64T get around that somehow, or is this just > another name for it? EM64T uses 64-bit wide registers and addressing, and can talk to >4GB of RAM natively. Older processors may still support >4GB of physical RAM using the PSE/PSE-36 CPU extensions, but are still using 32-bit registers. -- -Chuck
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