7. Multi-level Page Tables

30-bit virtual address space, 512 byte page = 21-bit virtual page number + 9-bit offset

PTE size 4 bytes --> 128 PTEs per page --> 7-bit PTIndex --> 14-bit PDIndex

2¹⁴ 4-byte page directory entries --> 128 pages

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Split page directory into two levels:

2⁷ 4-byte page directory entries --> 1 page