Datasheet

Datasheet, Volume 2 125
Processor Integrated I/O (IIO) Configuration Registers
3.4.4.29 VTBAR—Base Address Register for Intel
®
VT-d Chipset Registers
Register: VTBAR
Device: 8
Function: 0
Offset: 180h
Bit Attr Default Description
31:13 RWL 00000h
Intel VT-d Chipset Base Address
This field provides an aligned 8-K base address for IIO registers relating to
Intel VT-d. All inbound accesses to this region are completer aborted by the
IIO.
This is programmed once at boot time and does not change after that.
This field may be locked as RO in Intel
TXT mode.
12:1 RV 000h Reserved
0RWL 0
Intel VT-d Chipset Base Address Enable
Enables the VTBAR register.
This bit is RO when VTGENCTRL[15]=1 OR may be locked as RO in Intel
TXT
mode, else this bit is RW.