Suppose we have a system that uses a multi-level page table and we wanted to do some address translations.
In this example we get a memory dump of page tables. The format for each entry in the dump shows the index of each page table, and a series of hexidecimal value pair to represet one byte of data with each pair.
Some basic assumptions:
This means virtual address needs 15 bits (5 for the offset, 10 for the VPN). A physical address requires 12 bits (5 offset, 7 for the PFN).
The upper five bits of a virtual address are used to index into a page directory; the page directory entry (PDE), if valid, points to a page of the page table. Each page table page holds 32 page-table entries (PTEs). Each PTE, if valid, holds the desired translation (physical frame number, or PFN) of the virtual page in question.
page 0: 1b 1d 05 05 1d 0b 19 00 1e 00 12 1c 19 09 19 0c 0f 0b 0a 12 18 15 17 00 10 0a 06 1c 06 05 05 14
page 1: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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You will need to know where the page directory is located, so the Page Directory Base Register (PDBR) will have the information for you: PDBR: 108 (decimal) [This means the page directory is held in this page]
Try to translate the following virtual address to a physical address. What value does it fetch, or does it result in a fault?
We’ll do these three together in class
You can practice with these