Re: Grr..
Guy Sotomayor (ggs@shiresoft.com)
Sun, 7 Mar 1999 21:33:45 -0800
Quoted mail:
> AFAIK, that extra 4 bit of address space on the PPro and Xeon is not
> linearly addressable, but is divided into banks of memory, and you
> switch between them.
>
> you can use that memory sure, but not without the ugly code to use
> the bank-switching kludge/feature of PPro's and Xeon's.
>
> if you find anyone crazy enough to waste money on 2GB+ of RAM for an
> intel, tell me - i want to send them my CV.. 8^).
>
---End quote
No, the extra 4 bits of physical address are achieved by making pte twice
as large (so architecturally it could support 64 bit physical addresses).
In order to retain the 4GB virtual, Intel added a third level in the page
directory scheme. No bank switching required (just more pde's).
TTFN - Guy
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