The page is 256 bytes in size; There are 256 pages in the 64-bit space; Additionally, an 8-bit page offset and an 8-bit page number are part of a 16-bit address.
256 entries are contained in the first level page table using the aforementioned subdivision, with each entry linking to a second level page table. Each entry in a page table at the second level points to a table at the third level. There are 256 entries on a third-page table, each pointing to a different page.
Each page requires one entry for the page table. We can see that the 232 byte address space needs to be divided into 220 pages if we assume a 4GB virtual and physical address space and a page size of 4kB (2,12 bytes). As a result, there must be 220 entries in the page table.
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