Click the blue "Arm Selected" in the top left corner and select "Set as Star"Drainage Keywords: armv8, armv9, gic, gicv2, gicv3, exceptions, interrupts, irq, fiq, serror, sync, synchronous exceptions, asynchronous exceptions, vector table, vector table base address, VBAR, vbar_el3, interrupt nesting, interrupt cascading, Linux Kernel, optee, ATF, TF-A, optee, hypervisor, SPM
The relevant control bits affecting interrupt routing are mainly HCR_EL2.IMO/FMO/AMO (this article only discusses irq/virq, so we will only look at the IMO bit), in addition, the HCR_EL2.TGE bit affects whether the Application acts as Host or Guest.
Below is a summary of the routing rules for these bits:
After learning the principles, let’s look at four examples: (1) HCR_EL2.IMO=1, HCR_EL2.TGE=1 – routing to EL2, Application as Guest
(2) HCR_EL2.IMO=1, HCR_EL2.TGE=0 – routing to EL2, Application as Host
(3) HCR_EL2.IMO=0, HCR_EL2.TGE=1 – routing to EL1, Application as Guest
(4) HCR_EL2.IMO=0, HCR_EL2.TGE=0 – routing to EL1, Application as Host
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