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]

Issues ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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