Hi all,
AFAIK, for IA-32 arch, two-level paging is sufficient. But the
positions of PUD and PMD
are kept.
In the book "Understanding the Linux Kernel, 3rd", it said that
kernel set the number of
the entries of PUD and PMD to 1 and mapping these two entries into the
proper entry of
the Page Global Directory.
I don't quite understand the word "mapping". Does that mean there
is one entry in PGD
for both PUD and PMD? What do they used for? I think the hardware only
knows there's
two-level paging, so whatever in the entry of PUD and PMD doesn't
matter to the hardware.
Am I right?
Could anyone give me some explain? I wanna look through the source
code of paging
mechanism, but don't know where to start. Some clues?
Thanks a lot!
--
Wu Yu
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