Re: perspectives on 32 bit vs 64 bit

[Adam Skutt <askutt@wnec.edu>]

Helge Hafting wrote:
> You can address more than 4GiB by using the always-unpopular
> "segment" registers found on intel processors.
How?  In protected-mode, they're in use as segement descriptor 
selectors.  Certain bits have specific meanings you cannot override, as 
they're part of the memory protection mechanism.

> Simply have all but one segment "not present" and rely on the os
> to trap access and remap the page tables whenever the code switch segments.
Remap the tables to what?  The address used for the lookup with a PTE is 
32-bit.

Adam