Intel i7-2600 CM8062300834302S User Manual

Datasheet, Volume 2

295

58:57

RO-V

0h

Uncore

IOTLB Actual Invalidation Granularity (IAIG)
Hardware reports the granularity at which an invalidation request 

was processed through this field when reporting invalidation 

completion (by clearing the IVT field).
The following are the encodings for this field.
00 = Reserved. This indicates hardware detected an incorrect 

invalidation request and ignored the request. Examples of 

incorrect invalidation requests include detecting an 

unsupported address mask value in Invalidate Address 

register for page-selective invalidation requests.

01 = Global Invalidation performed. This could be in response to a 

global, domain-selective, or page-selective invalidation 

request.

10 = Domain-selective invalidation performed using the domain-id 

specified by software in the DID field. This could be in 

response to a domain-selective or a page-selective 

invalidation request.

11 = Domain-page-selective invalidation performed using the 

address, mask and hint specified by software in the Invalidate 

Address register and domain-id specified in DID field. This can 

be in response to a page-selective invalidation request. 

56:50

RO

0h

49

RW

0b

Uncore

Drain Reads (DR)
This field is ignored by hardware if the DRD field is reported as 

clear in the Capability register. When the DRD field is reported as 

Set in the Capability register, the following encodings are 

supported for this field:
0 = Hardware may complete the IOTLB invalidation without 

draining any translated DMA read requests.

1 = Hardware must drain DMA read requests.

48

RW

0b

Uncore

Drain Writes (DW)
This field is ignored by hardware if the DWD field is reported as 

Clear in the Capability register. When the DWD field is reported as 

Set in the Capability register, the following encodings are 

supported for this field:
0 = Hardware may complete the IOTLB invalidation without 

draining DMA write requests.

1 = Hardware must drain relevant translated DMA write requests.

47:40

RO

0h

39:32

RW

00h

Uncore

Domain-ID (DID)
Indicates the ID of the domain whose IOTLB entries need to be 

selectively invalidated. This field must be programmed by software 

for domain-selective and page-selective invalidation requests.
The Capability register reports the domain-id width supported by 

hardware. Software must ensure that the value written to this field 

is within this limit. Hardware ignores and not implements bits 

47:(32+N), where N is the supported domain-id width reported in 

the Capability register. 

31:0

RO

0h