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CPU as two modes privileged and non-privileged. In order to change the mode from privileged to non-privileged.

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CPU as two modes privileged and non-privileged. In order to change the mode from privileged to non-privileged.

(a) A hardware interrupt is needed

(b) A software interrupt is needed

(c) Either hardware or software interrupt is needed

(d) A non-privileged instruction (which does not generate an interrupt)is needed

I had been asked this question in homework.

Query is from Interrupts in portion Input/Output Organisation of Computer Architecture

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Right option is (b) A software interrupt is needed

To elaborate: A software interrupt by some program which needs some CPU service, at that time the two modes can be interchanged.

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