MP Configuration Table
Version 1.4
4-15
Table 4-11. Interrupt Type Values
Interrupt Type*
Description
Comments
0
INT
Signal is a vectored interrupt; vector is supplied by APIC
redirection table.
1
NMI
Signal is a nonmaskable interrupt.
2
SMI
Signal is a system management interrupt.
3
ExtINT
Signal is a vectored interrupt; vector is supplied by external PIC.
For example, if an 8259 is used as the external PIC, the source is
the 8259 INTR output line, and the vector is supplied by the 8259.
* All other values are reserved.
4.3.5 Local Interrupt Assignment Entries
These configuration table entries tell what interrupt source is connected to each local interrupt
input of each local APIC. Figure 4-8 shows the format of each entry, and Table 4-12 explains each
field.
00H
04H
ENTRY TYPE
4
INTERRUPT
TYPE
RESERVED
SOURCE
BUS ID
SOURCE BUS
IRQ
DESTINATION
LOCAL APIC ID
DESTINATION
LOCAL APIC
LINTIN#
P
O
E
L
31
0
7
8
15
16
23
24
LOCAL INTERRUPT FLAG
31
0
7
8
15
16
23
24
Figure 4-8. Local Interrupt Entry
