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A Hardware Architecture For Implementing Protection Rings

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My take on this famous paper on protection rings made for my graduate OS class

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A Hardware Architecture for Implementing Protection Rings Schroeder & Saltzer: Mighty Institute of Terminology (m.i.t.) Brought to you by: Chris Sosa I <3 Cornell
Overview ,[object Object],[object Object],[object Object]
Motivation ,[object Object],[object Object],[object Object]
Four Sets of Criteria to Judge Protection Mechanisms ,[object Object],[object Object],[object Object],[object Object]
What is a Protection Ring? ,[object Object],[object Object]
Protection Rings ,[object Object],[object Object],[object Object]
Protection Rings (cont’d) ,[object Object],[object Object],[object Object]
Moving Between Protection Rings ,[object Object],[object Object],[object Object],[object Object],[object Object]
Revisiting Gate Extension ,[object Object],[object Object]
Call and Return ,[object Object],[object Object],[object Object],[object Object]
Three Issues with Downward Calls ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Other calls? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Computer Architecture Support ,[object Object]
Quick Review of the Multics before Protection Rings ,[object Object],[object Object],[object Object],[object Object],[object Object]
Quick Review of Multics AFTER Protection Rings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
An Example ,[object Object]
Issues ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Questions?

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A Hardware Architecture For Implementing Protection Rings

  • 1. A Hardware Architecture for Implementing Protection Rings Schroeder & Saltzer: Mighty Institute of Terminology (m.i.t.) Brought to you by: Chris Sosa I <3 Cornell
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