There are generally three classes of interrupts on most platforms: 1. Exceptions: These are generated internally by … See more

There are actually two PICs on most systems, and each has 8 different inputs, plus one output signal that's used to tell the CPU that an IRQ occurred. The slave PIC's output signal is connected to the master PIC's third i… See more

Every time the CPU is done with one machine instruction, it will check if the PIC's pin has notified an interrupt. If that's the case, it stores some state information on the stack (so that it can return to whatever it is doing cur… See more

When an interrupt comes in, the IDT (which is setup by the OS in advance) is used to jump to code portion of the OS, which handles the interrupt (and therefore called the "interrupt handler" or "Interrupt Service Routines"). … See more

Step by step, now that you've grabbed the whole thing and know what's to be done: 1. Make space for the interrupt descriptor table 2. Tell the CPU where that space is (see GDT Tutorial: lidt works the very same way as lgdt… See more