Intel G640T CM8062301002204 User Manual

248

Datasheet, Volume 2

This register provides the base address of Interrupt remapping table. This register is 
treated as RsvdZ by implementations reporting Interrupt Remapping (IR) as not 
supported in the Extended Capability register.

63:39

RO

0h

Reserved 

38:12

RW-L

0000000h

Uncore

Interrupt Remapping Table Address (IRTA)
This field points to the base of 4 KB aligned interrupt remapping 

table.
Hardware ignores and does not implement bits 63:HAW, where 

HAW is the host address width.
Reads of this field returns value that was last programmed to it. 

11

RW-L

0b

Uncore

Extended Interrupt Mode Enable (EIME)
This field is used by hardware on Intel 64 platforms as follows:
0 = xAPIC mode is active. Hardware interprets only low 8-bits of 

Destination-ID field in the IRTEs. The high 24-bits of the 

Destination-ID field are treated as reserved.

1 = x2APIC mode is active. Hardware interprets all 32-bits of 

Destination-ID field in the IRTEs.

This bit is implemented as RsvdZ on implementations reporting 

Extended Interrupt Mode (EIM) field as Clear in Extended 

Capability register.

10:4

RO

0h

Reserved 

3:0

RW-L

0h

Uncore

Size (S)
This field specifies the size of the interrupt remapping table. The 

number of entries in the interrupt remapping table is 2^(X+1), 

where X is the value programmed in this field.