Рубрика «pirq»

This article is about the interrupt delivery process from external devices in the x86 system. It tries to answer questions such as:

  • What is PIC and what is it for?
  • What is APIC and what is it for? What is the purpose of LAPIC and I/O APIC?
  • What are the differences between APIC, xAPIC, and x2APIC?
  • What is MSI? What are the differences between MSI and MSI-X?
  • What is the role of the $PIR, MPtable, and ACPI tables?

If you want to know the answer for one of these questions, or if you simply want to know about interrupt controller evolution, please, welcome.
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