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Spring 2021 – COM SCI111-1 – EYOLFSON
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Question 11
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Points out of 1.00
Question 12
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Points out of 2.00
Page Tables (20 minutes).
Consider a three level page table using the Sv39 format. That means each level of page table uses 9 index bits, and there are 12 offset
bits. Each PTE is 8 bytes, and physical addresses are 56 bits.
How large is a page?
Does each level of the page table fit on a page? Why?
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Question 13
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Points out of 10.00
Question 14
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Points out of 7.00
Assume that virtual address 0x00404038FF maps to physical address 0x1118FF explain how you’d use a three level page table to do this
translation. For each level of the page table, give the indices you would use. For everything except the level 0 page table, you may
assume the entry is an abstract page table. The virtual address in binary is 0b000_0000_0100_0000_0100_0000_0011_1000_1111_1111.
One variation is to use a gigapage (which is 1 GiB). The page tables still fit within the original page size. What modification would you
have to make to resolve 0x00404038FF as a gigapage?
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