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Datasheet, Volume 2 253
Processor Configuration Registers
2.18.26 IRTA_REG—Interrupt Remapping Table Address Register
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.
B/D/F/Type: 0/0/0/GFXVTBAR
Address Offset: B8–BFh
Reset Value: 0000_0000_0000_0000h
Access: RW-L
Size: 64 bits
BIOS Optimal Default 0000_0000h
Bit Attr
Reset
Value
RST/
PWR
Description
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.
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