Hello,<div><br></div><div>I have some basic questions about IO-APIC.  In the boot-up message, I can see this:</div><div><br></div><div><div>IO-APIC[ 0]: pins 23</div><div>  PIN[ 0m]: vector=20, del=0, dm=physical, dest=0 (high, edge)</div>
<div>  PIN[ 1m]: vector=21, del=0, dm=physical, dest=0 (high, edge)</div><div>  PIN[ 2m]: vector=22, del=0, dm=physical, dest=0 (high, edge)</div><div><br></div><div>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&#39;s an irq number assigned to an IO-APIC pin?</div>
</div><div><br></div><div>Thanks.</div><div><br></div><div>Best,</div><div>Chen</div>