Andriy Gapon wrote:
on 03/11/2010 20:44 Alan Cox said the following:
[snip]
Thank you for the confirmation!
Andriy Gapon wrote:
P.S. is there a macro for extracting frame address from PDPE?
To a lower level page table page or to a 1GB physical page? For the latter, you
can use PG_PS_FRAME.
To a 1GB page.
I see in the architecture manual that the lower bits are marked as MBZ, so this
macro should work. Actually, it seems that even PG_FRAME should work in place
of
PG_PS_FRAME for exactly the same reason (MBZ) on amd64.
There is actually a point to using PG_PS_FRAME. The PAT bit for a 2MB
page mapping occupies a bit that is a part of the physical page number
with PG_FRAME. I suspect that the same is true of 1GB page mappings,
but I haven't double checked the manual.
Alan
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