现在初始化页表时的页目录为initial_page_table
之后4G部分会复制到swapper_pg_dir
commit b40827fa7268fda8a62490728a61c2856f33830b
Author: Borislav Petkov
Date: Sat Aug 28 15:58:33 2010 +0200
x86-32, mm: Add an initial page table for core bootstrapping
This patch adds an initial page table with low mappings used exclusively
for booting APs/resuming after ACPI suspend/machine restart. After this,
there's no need to add low mappings to swapper_pg_dir and zap them later
or create own swsusp PGD page solely for ACPI sleep needs - we have
initial_page_table for that.
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