Questions about IO-APIC

[Chen Tian]

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
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