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Q4: (total 20 marks) (1) What is an interrupt? (4 marks) (2) Please identify the I/O request, Transfer Done, Interrupt signaled, Interrupt handled respectively in

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Q4: (total 20 marks) (1) What is an interrupt? (4 marks) (2) Please identify the "I/O request", "Transfer Done", "Interrupt signaled", "Interrupt handled" respectively in the figure. ( 6 marks) (3) Does privilege level need to be changed in the interrupt? And how it can be changed? ( 6 marks) (4) How do software interrupts work? (4 marks)

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