In Fig. 4-9, the page field of the virtual address is 4 bits and the page field
Question:
In Fig. 4-9, the page field of the virtual address is 4 bits and the page field of the physical address is 3 bits. In general, is it permitted for the number of page bits of the virtual address to be smaller, equal to, or larger than the number of page bits of the physical address? Discuss your answer.
Transcribed Image Text:
Page table 11|0|0|0|0|0|0|0|0|0|0|1|0|0 15 14 13 12 11 10 9 8 000 0 000 0 000 0 6 5 4 3 2 000 0 111 1 000 0 101 1 000 0 7 000 000 011 100 000 0 0 1 1 1 110 1 1 001 1 0 010 1 110 -Present/ absent bit Virtual page = 2 is used as an index into the page table 12-bit offset copied directly from input to output 0010000000000100 Outgoing physical address (24580) Incoming virtual address (8196) Figure 4-9. The internal operation of the MMU with 16 4-KB pages.
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Related Book For
Operating Systems Design And Implementation
ISBN: 9780131429383
3rd Edition
Authors: Andrew Tanenbaum, Albert Woodhull
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