Differences between version 4 and previous revision of APIC.
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| Newer page: | version 4 | Last edited on Thursday, September 23, 2004 4:11:02 pm | by DanielLawson | Revert |
| Older page: | version 3 | Last edited on Sunday, March 14, 2004 5:19:07 am | by StuartYeates | Revert |
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The Local APIC is found on uniprocessor and mulitprocessor systems and built into recent [x86] chips (Pentium Pro and up). The Local APIC can be used by the OS to program interrupts to wake up threads, on [SMP] machines it can be used to send interrupts to another processor. The Local APIC also has a handy timer in it, you can set the timer to whatever you want and it'll start generating interrupts.
The IO-APIC is only really useful for [SMP] systems. It is used for sending various interrupts to various [CPU]s in the system. Without an IO-APIC interrupts from hardware only get delivered to the boot [CPU]. Another advantage is that [PCI] interrupts can be sent around the system without overlapping [IRQ]s.
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+Intel has notes about [ACPI] [here|http://www.intel.com/design/chipsets/datashts/290566.htm]
