Intel B940 Datasheet download pdf (Page 267)

Datasheet, Volume 2 267

Processor Configuration Registers

62:61 RW 00b

Context Invalidation Request Granularity (CIRG)

Software provides the requested invalidation granularity through this field

when setting the ICC field:

00 = Reserved.

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 source-id(s) must be

specified through the SID and FM fields, and the domain-id [that was

programmed in the context-entry for these device(s)] must be provided

in the DID field.

Hardware implementations may process an invalidation request by

performing invalidation at a coarser granularity than requested. 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 01b

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.

58:34 RO 0000000h Reserved

33:32 RO 00b

Function Mask (FM)

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 device(s) specified through the FM and SID fields must correspond to the

domain-ID specified in the DID field.

Value returned on read of this field is undefined.

31:16 RO 0000h

Source-ID (SID)

This field 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.

Value returned on read of this field is undefined.

15:0 RW 0000h

Domain-ID (DID)

This field 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 ignores (and may not implement) bits 15:N where N is the

supported domain-id width reported in the capability register.

B/D/F/Type: 0/2/0/GFXVTBAR

Address Offset: 28–2Fh

Reset Value: 0800000000000000h

Access: RW, RO

Bit Attr

Reset

Value

Description

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Intel B940 Datasheet Page 267

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