Sorry for basic question,
For ARM64, we have different interrupt vector table for each mode EL3/EL2/EL1
I am wondering, how a specific IRQ is routed to given mode.
in GIC, I am not able to find such relation
Thanks
Udit
The routing of interrupts (IRQs and FIQs) is controlled by two registers: HCR_EL2 and SCR_EL3.
In SCR_EL3, the IRQ and FIQ bits control which interrupts cause entry to EL3
In HCR_EL2, the IMO and FMO bits control which interrupts cause entry to EL2.
If you try to set the routing bits for sat IRQs in SCR_EL3 and HCR_EL2, SCR_EL3 wins.
If you've not routed the interrupt type to either EL2 or EL3, then it defaults to being routed to EL1.