I'm developing now a code snippet that should enable\disable local APIC. I've seen in the Intel manual that I have to set a spurious interrupt vector prior to enabling LoAPIC. In the Intel Manual I see the following explanation:
A special situation may occur when a processor raises its task priority to be greater than or equal to the level of the interrupt for which the processor INTR signal is currently being asserted. If at the time the INTA cycle is issued, the interrupt that was to be dispensed has become masked (programmed by software), the local APIC will deliver a spurious-interrupt vector. Dispensing the spurious-interrupt vector does not affect the ISR, so the handler for this vector should return without an EOI. Blockquote
Can anyone please help me to understand what conditions lead the local APIC to issue a spurious interrupt?
Thanks in advance.
