MEM FEC00010h - Pentium - 82379AB I/O APIC - I/O WINDOW                         
Size:	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.
Range:	the Multiprocessor Specification calls for I/O APICs to be memory-
	  mapped on 4K boundaries between FEC00000h and FEDFC000h
Note:	this memory-mapped register is also supported by the Intel 82093AA
	  I/O APIC
SeeAlso: MEM FEC00010h


(Table M0118)
Values for Intel 82379AB/82093AA I/O APIC registers:
 00h	APIC ID
 01h	APIC version (read-only)
	bits 31-24: reserved
	bits 23-16: maximum redirection entry
	bits 15-8: reserved
	bits 7-0: APIC version (11h for 82093AA)
 02h	APIC arbitration ID (read-only)
	bits 31-28: reserved
	bits 27-24: arbitration ID
	bits 23-0: reserved
 10h-11h	redirection table entry 0 (10h=low DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address., 11h=high DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.)
 12h-13h	redirection table entry 1 (see !!!)
 ...
 2Eh-2Fh	redirection table entry 15
---82093AA only---
 30h-31h	redirection table entry 16
 ...
 3Eh-3Fh	redirection table entry 23


Bitfields for APIC redirection table entry:
Bit(s)	Description	(Table M0119)
 63-56	destination
!!!29056601.pdf pg. 10
 55-17	reserved
 16	interrupt mask
 15	trigger mode
 14	remote IRR (read-only)
 13	interrupt input pin polarity
 12	delivery status (read-only)
 11	destination mode
 10-8	delivery mode
 7-0	interrupt vector (10h-FEh)