Some questions about boot memory

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hi all:

 I have some question about the relationship between page table
 creation and bootmemery allocation.
 bootmemory allocation use 1-bit to declare this page is used or not.
 Does that mean when a new page table is creating, it will reference
 the bits of bootmap and add dirty flag on the page of the page table created?

 --
 Thanks a lot

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