Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 2 01-2011 Datasheet page 221

Processor Configuration Registers
B/D/F/Type:
Address Offset:
Reset Value:
Access:
Size:
BIOS Optimal Default
Bit
2
1
0
Datasheet, Volume 2
0/0/0/GFXVTBAR
10–17h
0000000000F0101Ah
RO, RO-V
64 bits
00000000000h
Reset RST/
Attr
Value PWR
RO 0b Uncore
RO-V 1b Uncore
RO 0b Uncore
Description
Device IOTLB Support (DI)
0 = Hardware does not support device-IOTLBs.
1 = Hardware supports Device-IOTLBs.
Implementations reporting this field as set must also support
Queued Invalidation (QI).
Queued Invalidation Support (QI)
0 = Hardware does Not support queued invalidations.
1 = Hardware supports queued invalidations.
Coherency (C)
This field indicates if hardware access to the root, context, page-
table and interrupt-remap structures are coherent (snooped) or
not.
0 = Hardware accesses to remapping structures are non-coherent.
1 = Hardware accesses to remapping structures are coherent.
Hardware access to advanced fault log and invalidation queue are
always coherent.
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