Interrupts

Question 1

Define an exeption

Answer 1

a synchronous event generated by the processor when a condition occurs

Question 2

what are the conditions where an exeption is thrown

Answer 2

divide by 0
unkown instruction
ALU overflow
floating point maths error
memory access error

Question 3

What is a timing interrupt

Answer 3

mechanism where a processor is interrupted at regular intervals
(i.e in round robin)

Question 4

How does the computer handle break points

Answer 4

replaces the instruction with a software interrupt

original instruction saved by the debugger

Question 5

define input device interrupt

Answer 5

transfer data to input buffer and if buffer is full disable interrupts

Question 6

kernel call for input

Answer 6

if input buffer is not empty return data else deschecudle the program

Question 7

output device interrupt

Answer 7

transfer data to the device if buffer empty disable interrupts

Question 8

kernel call for output

Answer 8

transfer data to output buffer enable interrupts if output buffer full deschedule

Question 9

errors

Answer 9

deschedule program