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In extended paging, 32 bits of linear address are divided into two fields:
• Directory: The most significant 10 bits represents directory.
• Offset: The remaining 22 bits represents offset.
Each entry of the page directory and of the page table is represented by the same data structure. This data
structure includes fields that describe the page table or page entry, such as accessed flag, dirty flag, and page
size flag. The two important flags for access control are the Read/Write flag and the User/Supervisor flag.
Read/Write flag: Holds access rights of the page or the page table. The Read/Write flag is either read/write
or read. If set to 0, the corresponding page or page table can only be read; otherwise, the corresponding page
table can be written to or read.
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Figure 5-31: Extended paging
Figure 5-30: Regular paging