How to handle Interrupt with certain interrupt ID in Arm Trusted Firmware

Hi, I'm new to Arm Community. Regarding to trusted firmware document, it seems that I cannot register an interrupt handler with certain interrupt ID. They reserved the id parameter as INTR_ID_UNAVAILABLE. 

I wonder how to make a customized interrupt handler with certain interrupt ID in ArmTF. Say, I want to handle PMU interrupt with interrupt ID 34 in Juno board.


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