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6 September, 03:06

1. A microprocessor supports a single hardware timer. Suppose instruction SET_TIMER permits one to set the timer value1. Does this need to be a privileged instruction?

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  1. 6 September, 03:19
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    No.

    Explanation:

    The Instructions that can run only in User Mode are called Non-Privileged Instructions.

    Various examples of Non-Privileged Instructions include:

    Reading the status of Processor

    Reading the System Time

    Generate any Trap Instruction

    Sending the final prinout of Printer

    Also, it is important to note that in order to change the mode from Privileged to Non-Privileged, we require a Non-privileged Instruction that does not generate any interrupt.
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