generic IO-APIC question

generic IO-APIC question

[Jarrett L. Redd]

Can someone please explain to me or refer me to a website or book or 
other document which explains the differences among the terms "APIC", 
"IO-APIC", and "local APIC"?  I'm relatively new to Intel x86 hardware 
as I am transitioning over from the MIPS world.  I have searched around 
and found some basic info, but it is just enough information to get 
confusing.  What would be really nice would be a nice book discussing 
this topic in detail, as opposed to a few data sheets and/or the 
occasional website that has only a brief paragraph.  Thanks...

-Jarrett Redd

Re: generic IO-APIC question

[Randy.Dunlap]

On Thu, 18 Jul 2002, Jarrett L. Redd wrote:

| Can someone please explain to me or refer me to a website or book or
| other document which explains the differences among the terms "APIC",
| "IO-APIC", and "local APIC"?  I'm relatively new to Intel x86 hardware
| as I am transitioning over from the MIPS world.  I have searched around
| and found some basic info, but it is just enough information to get
| confusing.  What would be really nice would be a nice book discussing
| this topic in detail, as opposed to a few data sheets and/or the
| occasional website that has only a brief paragraph.  Thanks...

I'd certainly be glad to see something like that also.
However, all that I'm familiar with are the 3 volumes of
"IA-32 Intel Architecture Software Developer's Manual" that
you can find/download from developer.intel.com (.pdf files).
Volume 1 is Basic Architecture.
Volume 2 is Instruction Set Reference.
Volume 3 is System Programming Guide.
Vol. 3 is the best resource of these 3, and includes:
  Ch. 7:  MULTIPLE-PROCESSOR MANAGEMENT
  Ch. 8:  PROCESSOR MANAGEMENT AND INITIALIZATION
  App. D: PROGRAMMING THE LINT0 AND LINT1 INPUTS
  App. F: APIC BUS MESSAGE FORMATS

If you find a good resource for this info, please post it.

HTH.
-- 
~Randy