Intel G640T CM8062301002204 User Manual

266

Datasheet, Volume 2

This register reports general remapping hardware capabilities.

63:56

RO

0h

55

RO

1b

Uncore

DMA Read Draining (DRD)
0 = Hardware does Not support draining of DMA read requests.

1 = Hardware supports draining of DMA read requests.

54

RO

1b

Uncore

DMA Write Draining (DWD)
0 = Hardware does Not support draining of DMA write requests.

1 = Hardware supports draining of DMA write requests.

53:48

RO

001001b

Uncore

Maximum Address Mask Value (MAMV)
The value in this field indicates the maximum supported value for 

the Address Mask (AM) field in the Invalidation Address register 

(IVA_REG) and IOTLB Invalidation Descriptor (iotlb_inv_dsc).
This field is valid only when the PSI field in Capability register is 

reported as set.

47:40

RO

00000000b

Uncore

Number of Fault-recording Registers (NFR)
Number of fault recording registers is computed as N+1, where N 

is the value reported in this field.
Implementations must support at least one fault recording register 

(NFR = 0) for each remapping hardware unit in the platform.
The maximum number of fault recording registers per remapping 

hardware unit is 256.

39

RO

1b

Uncore

Page Selective Invalidation (PSI)
0 = Hardware supports only domain and global invalidates for 

IOTLB

1 = Hardware supports page selective, domain and global 

invalidates for IOTLB

Hardware implementations reporting this field as set are 

recommended to support a Maximum Address Mask Value (MAMV) 

value of at least 9.

38

RO

0h

37:34

RO

0000b

Uncore

Super-Page Support (SPS)
This field indicates the super page sizes supported by hardware.
A value of 1 in any of these bits indicates the corresponding super-

page size is supported. The super-page sizes corresponding to 

various bit positions within this field are:
0h = 21-bit offset to page frame (2 MB)
1h = 30-bit offset to page frame (1 GB)
2h = 39-bit offset to page frame (512 GB)
3h = 48-bit offset to page frame (1 TB)
Hardware implementations supporting a specific super-page size 

must support all smaller super-page sizes (that is, only valid 

values for this field are 0001b, 0011b, 0111b, 1111b). 

33:24

RO

020h

Uncore

Fault-recording Register offset (FRO)
This field specifies the location to the first fault recording register 

relative to the register base address of this remapping hardware 

unit.
If the register base address is X, and the value reported in this 

field is Y, the address for the first fault recording register is 

calculated as X+(16*Y).