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Datasheet, Volume 2 291

Processor Configuration Registers

2.18.29 IOTLB_REG—IOTLB Invalidate Register

This register invalidates IOTLB. The act of writing the upper byte of the IOTLB_REG

with IVT field set causes the hardware to perform the IOTLB invalidation.

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

Address Offset: 108–10Fh

Reset Value: 0200000000000000h

Access: RO-V, RW, RW-V

Size: 64 bits

BIOS Optimal Default 0000000000000h

Bit Access

Reset

Value

RST/

PWR

Description

63 RW-V 0h Uncore

Invalidate IOTLB (IVT)

Software requests IOTLB invalidation by setting this field.

Software must also set the requested invalidation granularity by

programming the IIRG field.

Hardware clears the IVT field to indicate the invalidation request

is complete. Hardware also indicates the granularity at which the

invalidation operation was performed through the IAIG field.

Software must not submit another invalidation request through

this register while the IVT field is set, nor update the associated

Invalidate Address register.

Software must not submit IOTLB invalidation requests when

there is a context-cache invalidation request pending at this

remapping hardware unit.

Hardware implementations reporting write-buffer flushing

requirement (RWBF=1 in Capability register) must implicitly

perform a write buffer flushing before invalidating the IOTLB.

62:62 RO 0h Reserved (RSVD)

61:60 RW 0h Uncore

IOTLB Invalidation Request Granularity (IIRG)

When requesting hardware to invalidate the IOTLB (by setting

the IVT field), software writes the requested invalidation

granularity through this field. The following are the encodings for

the field.

00 = Reserved.

01 = Global invalidation request.

10 = Domain-selective invalidation request. The target domain-

id must be specified in the DID field.

11 = Page-selective invalidation request. The target address,

mask and invalidation hint must be specified in the

Invalidate Address register, and the domain-id 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 IVT field. At this time, the granularity at

which actual invalidation was performed is reported through the

IAIG field

59:59 RO 0h Reserved (RSVD)

1 2 ... 286 287 288 289 290 291 292 293 294 295 296 ... 341 342

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