Read 2 : Interrupt Controller Notes (ARM Sys Dev Guide)

What is an interrupt controller ?
When a peripheral or device require attention, it raises as interrupt to the processor. An interrupt controller
provide a programmable governing policy that allows software to determine which peripheral or device can
intrrupt the process at any specific time by setting the appropriate bits in the interrupt controller
register.

There two kind of interrupt controller available for ARM processor
1. Standard interrupt controller
2. Vector interrupt controller