Question 22 (2 points)

Put the following steps for handling interrupt in correct order.

1) actual work of the handler

2) disable interrupt

3) enable interrupt

4) restore k0 from stack

5) restore state

6) return from interrupt

7) save k0 on stack

8) save state

Question 22 options:

	7) 3) 8) 1) 5) 2) 4) 6)
	7) 3) 1) 8) 5) 2) 6) 4)
	7) 3) 8) 1) 6) 2) 4) 5)
	7) 3) 8) 1) 5) 6) 4) 2)

Question 23 (2 points)

Which one cannot make processor know which device has requested an interrupt?

Question 23 options:

	the device supplies the address of its interrupt handler
	the device provides a vector into a table of interrupt handler addresses
	the device delivers a table containing its identity to the processor
	the processor cannot acknowledge the device for the interruption

Question 24 (2 points)

In the following interrupt handler code, please select the one which does not belong.

Question 24 options:

	enable interrupts
	save processor registers
	restore PC
	return from interrupt

Question 25 (2 points)

In the following actions in the INT macro state, please select the one that does not belong.

Question 25 options:

	save PC value retrieved from the vector table to PC
	save PC to $k0
	ACK INT by asserting INTA
	retrieve PC address from the interrupt vector table

Question 26 (2 points)

Which one of the following activities is an Exception?

Question 26 options:

	System Call
	Accessing illegal memory address
	page fault
	reading of hard drive completion

Question 27 (2 points)

Which one of the following activities is a Trap?

Question 27 options:

	System Call
	Memory overflow
	accessing illegal memory address
	I/O device completion