Intel i7-2600 CM8062300834302S User Manual

Datasheet, Volume 2

277

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Context Actual Invalidation Granularity (CAIG)
Hardware reports the granularity at which an invalidation request 

was processed through the CAIG field at the time of reporting 

invalidation completion (by clearing the ICC field).
The following are the encodings for this field:
00 = Reserved.
01 =  Global Invalidation performed. This could be in response to 

a global, domain-selective or device-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 device-selective 

invalidation request.

11 =  Device-selective invalidation performed using the source-id 

and domain-id specified by software in the SID and FM 

fields. This can only be in response to a device-selective 

invalidation request. 

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Function Mask (FM)
Software may use the Function Mask to perform device-selective 

invalidations on behalf of devices supporting PCI Express Phantom 

Functions.
This field specifies which bits of the function number portion (least 

significant three bits) of the SID field to mask when performing 

device-selective invalidations. The following encodings are defined 

for this field:
00 =  No bits in the SID field masked.
01 =  Mask most significant bit of function number in the SID 

field.

10 =  Mask two most significant bit of function number in the SID 

field.

11 = Mask all three bits of function number in the SID field.
The context-entries corresponding to all the source-ids specified 

through the FM and SID fields must have to the domain-id 

specified in the DID field. 

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Source ID (SID)
Indicates the source-id of the device whose corresponding context-

entry needs to be selectively invalidated. This field along with the 

FM field must be programmed by software for device-selective 

invalidation requests. 

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

selectively invalidated. This field must be programmed by software 

for both domain-selective and device-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 may ignore and not implement 

bits15:N, where N is the supported domain-id width reported in the 

Capability register.