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Old 08-26-2008, 11:00 PM   #1
LXer
LXer NewsBot
 
Registered: Dec 2005
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LXer: CPU Rings, Privilege, and Protection


Published at LXer:

You probably know intuitively that applications have limited powers in Intel x86 computers and that only operating system code can perform certain tasks, but do you know how this really works? This post takes a look at x86 privilege levels, the mechanism whereby the OS and CPU conspire to restrict what user-mode programs can do.

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