There are four privilege rings, from ring 0 to ring 3. Ring 0 has the most
privileges, and can access all instructions and memory addresses. The operating system usually
runs in ring 0. Ring 1 and 2 have less privileges and are used for operating system services.
Ring 3 has the least privileges and is used for user applications.
a minixnel a kernel ring0 a kernel taszkok meg ring1
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