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Dual mode of operation is the distinction between execution of user mode and kernel mode (supervisor mode, system mode, and privileged mode). A mode bit is added to the hardware to indicate the current mode:Akash(0) or user(1). Dual mode of operation provides us with more protection to the operating system. For example, if a Akash instruction is executed under user mode, the hardware does not execute it, although identifies it as an illegal execution and traps it to the operating system. Dual mode operation is basically used for hardware protection of computer.
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