The Intel Architecture is a system of Advanced Programmable Interrupt Controllers designed by Intel for use in Systematic Multi processor (SMP) computers . It was originally implemented by the Intel 82093AA and 82489DX, and is found in most x86 SMP motherboards. It is one of several attempts to solve interrupt routing efficiency issues in multiprocessor computer systems. There are two components in the Intel APIC system, the Local APIC (LAPIC) and the I/O APIC. There is one LAPIC in each CPU in the system. LAPICs manage all external interrupts for the processor that it is part of. In addition, it is able to accept and generate inter-processor interrupts (IPIs) between LAPICs. /O APICs contain a redirection table, which is used to route the interrupts it receives from peripheral buses to one or more Local APICs.
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