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Index > OS Construction > Why don't modern OSes use Ring1 and/or Ring2?

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f0dder



Joined: 19 Feb 2004
Posts: 3170
Location: Denmark
f0dder
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Well, we also have Virtualization to thank. AMD Pacifica and Intel VT instruction sets mean that you can if you so desire, completely isolate different execution environments.
Problem is, it doesn't. There are parts that aren't 100% emulated yet, and are very hard to trap... sorry that I can't divulge more than that, but it would be against commercial interest *grin*. VMX and the extensions are a good step, though.
Post 24 May 2008, 04:07
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