Interrupts: Unconnected PIT (IRQ0) leg to IOAPIC on some old motherboards
We probably want to at least consider this note sometime in the future:
https://github.com/torvalds/linux/blob/5ad0ec0b86525d0c5d3d250d3cfad7f183b00cfa/arch/x86/kernel/i8259.c#L47-L56
Since we are talking about old motherboards, the default behavior should be to disable the PIC if we use the IOAPIC. However, we could provide a boot argument to force opeation in mixed mode, when the PIC is not disabled entirely. We already assign to each IRQHandler a responsible IRQ controller, so enabling mixed mode is not terribly hard to implement :)
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