July 2004
Intermediate to advanced
1744 pages
35h 3m
English
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Paging Can Do It All
If segmentation is eliminated and Paging is used, the Paging Unit can provide complete protection, as well as the paging capability described in the previous chapter. The Paging Unit provides the following checks on each memory access attempt:
A privilege check using the PTE's U/S bit.
Read/write permission checking using the PTE's R/W bit.
When a memory access is attempted, the Paging Unit deals with one of three cases:
The target page is currently in memory (P = 1 in the PTE). Assuming that the currently executing program has sufficient privilege to access the page and that it's not attempting to write to a read-only page, the access is permitted.
The target page isn't in memory (P = 0 in the PTE). This results in a Page ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.