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- 1Note that the negative rings are not real rings. They were just given that nickname. A real ring is a value of CPL (Current Privilege Level), which cannot be negative. There's CPL0, CPL1, CPL2, and CPL3, and nothing else.forest– forest2019-09-05 07:14:38 +00:00Commented Sep 5, 2019 at 7:14
- I think ring 2 was also used for OS/2 drivers.forest– forest2019-09-05 07:48:36 +00:00Commented Sep 5, 2019 at 7:48
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