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These are called page table entries, and are very similar to page directory entries.Note: Only explanations of the bits unique to the page table are below.If the Dirty flag ('D') is set, then the page has been written to. (See Higher Half Kernel) After Identity Paging the first megabyte, I start to create my second table (ie.This flag is not updated by the CPU, and once set will not unset itself. at entry #768 in my directory.) to map 0x100000 to 0xc0000000.There is no paging table involved in the address translation.Note: With 4-Mi B pages, bits 21 through 12 are reserved!
System pages are also protected from user processes.
On the x86, the MMU maps memory through a series of tables, two to be exact.
They are the paging directory (PD), and the paging table (PT).
In fact, current implementations of x86-64 have a limit of between 4 Gi B and 256 Ti B of physical address space (and an architectural limit of 4 Pi B of physical address space).
In addition to this, paging introduces the benefit of page-level protection.