I am booting up a custom kernel on QEMU ARM64, upon completion of its initial boot up it looks like it enters the arch_idle() state
I enabled the -d int logging to understand what is going on, I see the following repeated many times continuosly here after Taking exception 5 [IRQ] ...from EL1 to EL1 ...with ESR 0x15/0x56000000 ...with ELR 0xffffffff0000349c ...to EL1 PC 0xffffffff00008280 PSTATE 0x3c5 Here's the dissassembly for the relevant piece of code: ffffffff00003498 <arch_idle>: arch_idle(): ../../kernel/arch/arm64/arch.cpp:182 ffffffff00003498: d503207f wfi ffffffff0000349c: d65f03c0 ret I am trying to understand what exceptions are occurring exactly when kernel is idle (timer?). According to above ELR is pointing to arch_idle(), but I believe "wfi" instruction would not be an IRQ but a sync abort which is handle differently right? Also from ESR, it looks like a SVC instruction but if I am not wrong for IRQs ESRs are not updated (considered) One more thing, is there a way in QEMU I could find out what exception 5 is corresponding to?
