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https://www.kernel.org/doc/html/latest/x86/i386/IO-APIC.html
Without an IO-APIC, interrupts from hardware will be delivered only to the CPU which boots the operating system (usually CPU#0). Linux supports all variants of compliant SMP boards, including ones with multiple IO-APICs. Multiple IO-APICs are used in high-end servers to distribute IRQ load further.
http://infomory.com/what-is/what-is-io-apic/
Jun 06, 2013 · People using the newer operation systems should enable the I/O APIC feature and disable it if they are using old operating systems. The I/OA PIC function is very important for multiprocessor support; this feature improves the user’s experience. APIC is an interrupt controller and all parts of the system is connected to an APIC bus.
https://wiki.osdev.org/IOAPIC
'apic_base' is the memory base address for a selected IOAPIC, these can be found by enumerating them from the MP or ACPI Tables. IO APIC Inputs . How other hardware (devices, etc) use IO APIC inputs is completely arbitrary - the motherboard/chipset designer can hard-wire anything they like to any IO APIC …
https://serverfault.com/questions/74672/why-should-i-enable-io-apic-in-virtualbox?noredirect=1
Note: Enabling the I/O APIC is required for 64-bit guest operating systems, especially Windows Vista; it is also required if you want to use more than one virtual CPU in a virtual machine. However, software support for I/O APICs has been unreliable with some operating systems other than Windows.
https://forums.virtualbox.org/viewtopic.php?t=55192
Apr 18, 2013 · Yo, I'm working on a kernel project in which I am currently attempting to get IO-APIC support working in Virtual Box. I say "in Virtual Box", because the my code works everywhere else -- on all of the real hardware test cases I have (2 laptops), the Bochs emulator, Qemu and VMWare Player.
https://www.suse.com/support/kb/doc/?id=7017631
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https://en.wikipedia.org/wiki/Intel_APIC_Architecture
In computing, Intel's Advanced Programmable Interrupt Controller (APIC) is a family of interrupt controllers.As its name suggests, the APIC is more advanced than Intel's 8259 Programmable Interrupt Controller (PIC), particularly enabling the construction of multiprocessor systems. It is one of several architectural designs intended to solve interrupt routing efficiency issues in multiprocessor ...
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