On Wed, 2003-12-10 at 16:21, dsavage at peaknet.net wrote: > Nope. Flat addressing up to 2^64. 2^47, actually. The upper 17 bits of a virtual address are required to be all 1 or all 0, or else the CPU raises a GPF. And there are still segments present, even in long mode, but they behave very weirdly. <b