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In computing, protected mode, also called protected virtual address mode, is an operational mode of x86-compatible central processing units. It allows system software to use features such as virtual memory, paging and safe multi-tasking designed to increase an operating system's control over application software.
When a processor that supports x86 protected mode is powered on, it begins executing instructions in real mode, in order to maintain backward compatibility with earlier x86 processors. Protected mode may only be entered after the system software sets up several descriptor tables and enables the Protection Enable bit in the control register 0.


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