Could you please explain how arbitration priority register works in Advanced Programmable Interrupt Controller (APIC) and what is the term winning CPU?

The Customary Welcome to LQ, poovendhan.

On your 1st post as a newbie, you're inquiring about a specialised topic requiring hardware, firmware and software knowledge, worthy of a software dev, and hoping someone will write out a detailed explanation for you? You can't be a newbie and come up with a question like that. Where have you been?

Are you writing software? What are you trying to do? On what hardware? How_To_Ask_a_Question

Have you searched this site? Kernel Documentation? Stackexchange? Google?

Winning cpu is likely the core/cpu that gets priority, i.e. whose irq is answered first, as there's only one databus.

1 members found this post helpful.

From some of the first hits in Google:
https://wiki.osdev.org/APIC
https://en.wikipedia.org/wiki/Advanc...upt_Controller
https://patents.google.com/patent/US5758169

And it appears you've asked this exact question on other forums as well; do you honestly expect people on forums to type out entire papers for you, and perform your research for you??? We are happy to help with specific questions, but you're (essentially) asking us to look things up for you and explain them to you.

Read the "Question Guidelines" link in my posting signature.

1 members found this post helpful.

Sorry for trouble. I am new to the Linux. Few days before only i started reading on linux and tried to found answer for this above question but i didnt get. Now i understood about this(APIC) clearly. Thank you so much for your kind help. Please keep support me to Learn Linux.:-)

Your question had/has nothing to do with Linux, anymore than it does Windows or Mac OSX...APIC is a separate standard. Again, we are happy to help with specific questions/problems if you're coding, but again, read the "Question Guidelines" link in my posting signature. Do basic research first, and don't just ask people to look things up for you.