28 Jul
2012
28 Jul
'12
2:34 a.m.
Hello,
I have some basic questions about IO-APIC. In the boot-up message, I can see this:
IO-APIC[ 0]: pins 23 PIN[ 0m]: vector=20, del=0, dm=physical, dest=0 (high, edge) PIN[ 1m]: vector=21, del=0, dm=physical, dest=0 (high, edge) PIN[ 2m]: vector=22, del=0, dm=physical, dest=0 (high, edge)
I understand this info is from IO-APIC redirection table. My question is what does vector means? Is that the interrupt number CPU is going to see when an interrupt request is sent from a pin? Or it's an irq number assigned to an IO-APIC pin?
Thanks.
Best, Chen