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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 neededI had been asked this question in homework.Query is from Interrupts in portion Input/Output Organisation of Computer Architecture

Answer»

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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