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Vol. 3 10-39
ADVANCED PROGRAMMABLE INTERRUPT CONTROLLER (APIC)
The ICR consists of the following fields.
Vector The vector number of the interrupt being sent.
Delivery Mode Specifies the type of IPI to be sent. This field is also know as the
IPI message type field.
000 (Fixed) Delivers the interrupt specified in the vector
field to the target processor or processors.
001 (Lowest Priority)
Same as fixed mode, except that the inter-
rupt is delivered to the processor executing
at the lowest priority among the set of pro-
cessors specified in the destination field. The
Figure 10-17. Interrupt Command Register (ICR)
31 0
Reserved
7
Vector
Destination Shorthand
810
Delivery Mode
000: Fixed
001: Lowest Priority
1
00: No Shorthand
01: Self
111213141516171819
10: All Including Self
11: All Excluding Self
010: SMI
011: Reserved
100: NMI
101: INIT
110: Start Up
111: Reserved
Destination Mode
0: Physical
1: Logical
Delivery Status
0: Idle
1: Send Pending
Level
0 = De-assert
1 = Assert
Trigger Mode
0: Edge
1: Level
63
32
Reserved
Destination Field
56
Address: FEE0 0300H (0 - 31)
Value after Reset: 0H
Reserved
20
55
FEE0 0310H (32 - 63)
NOTE:
1. The ability of a processor to send Lowest Priority IPI is model specific.