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Privileged ModeIn processors with memory protection, privileged mode (as opposed to user mode) is the mode in which the operating system kernel runs. Code running in this mode has unlimited access to the system memory and external devices. Microkernel operating systems attempt to minimize the amount of code running in privileged mode, for security and elegance reasons. The x86 architecture is unusual in having four privilege levels (even though only two are used in practice), of which the most privileged is known as ring 0.
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