Intel E7-8891 v2 CM8063601377422 ユーザーズマニュアル

408

Intel

®

 Xeon

® 

Processor E7-2800/4800/8800 v2 Product Family

Datasheet Volume Two: Functional Description, February 2014

63:63

RW_V

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icc:

Invalidate Context Entry Cache  
Software requests invalidation of context-cache by setting this field. 

Software must also set the requested invalidation granularity by 

programming the CIRG field. Software must read back and check the ICC 

field to be clear to confirm the invalidation is complete. Software must not 

update this register when this field is set. Hardware clears the ICC field to 

indicate the invalidation request is complete. Hardware also indicates the 

granularity at which the invalidation operation was performed through the 

CAIG field. Software must not submit another invalidation request through 

this register while the ICC field is set.Software must submit a context cache 

invalidation request through this field only when there are no invalidation 

requests pending at this DMA-remapping hardware unit. Since information 

from the context-cache may be used by hardware to tag IOTLB entries, 

software must perform domain-selective (or global) invalidation of IOTLB 

after the context cache invalidation has completed. 

62:61

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cirg:

Context Invalidation Request Granularity  
When requesting hardware to invalidate the context-entry cache (by setting 

the ICC field), software writes the requested invalidation granularity through 

this field.Following are the encoding for the 2-bit IRG field.
00: Reserved. Hardware ignores the invalidation request and reports 

invalidation complete by clearing the ICC field and reporting 00 in the CAIG 

field.
01: Global Invalidation request. 
10: Domain-selective invalidation request. The target domain-id must be 

specified in the DID field.
11: Device-selective invalidation request. The target SID must be specified 

in the SID field, and the domain-id (programmed in the context-entry for 

this device) must be provided in the DID field. The processor aliases the h/w 

behavior for this command to the ‘Domain-selective invalidation request’.
Hardware indicates completion of the invalidation request by clearing the 

ICC field. At this time, hardware also indicates the granularity at which the 

actual invalidation was performed through the CAIG field. 

60:59

RO_V

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caig:

Context Actual Invalidation Granularity  
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 encoding for the 

2-bit CAIG field. 00: Reserved. This is the value on reset.
01: Global Invalidation performed. The processor sets this in response to a 

global invalidation request.
10: Domain-selective invalidation performed using the domain-id that was 

specified by software in the DID field. The processor set this in response to a 

domain-selective or device-selective invalidation request.
11: Device-selective invalidation. The processor never sets this encoding. 

58:34

RV

-

Reserved.

33:32

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fm:

Function Mask  
Used by the processor when performing device selective invalidation. 

31:16

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source_id:

Used by the processor when performing device selective context cache 

invalidation