ACPI MADT only does if the PC-AT flag is set), then don't assume that pin 0 on the first I/O APIC is an ExtINT pin. Instead, assume that it is ISA IRQ 0.
ACPI MADT only does if the PC-AT flag is set), then don't assume that pin 0 on the first I/O APIC is an ExtINT pin. Instead, assume that it is ISA IRQ 0.