Processor Configuration Registers
B/D/F/Type:
Address Offset:
Reset Value:
Access:
0/0/0/GFXVTBAR
18–1Bh
00000000h
RO, WO
32 bits
Size:
BIOS Optimal Default
000000h
Reset
Value
RST/
PWR
Bit
Access
Description
Write Buffer Flush (WBF)
This bit is valid only for implementations requiring write buffer
flushing.
Software sets this field to request that hardware flush the Root-
Complex internal write buffers. This is done to ensure any
updates to the memory-resident remapping structures are not
held in any internal write posting buffers.
27
RO
0b
Uncore
Hardware reports the status of the write buffer flushing operation
through the WBFS field in the Global Status register.
Clearing this bit has no effect. The value returned on a read of
this field is undefined.
Queued Invalidation Enable (QIE)
This field is valid only for implementations supporting queued
invalidations.
Software writes to this field to enable or disable queued
invalidations.
0 = Disable queued invalidations.
26
WO
0b
Uncore
1 = Enable use of queued invalidations.
Hardware reports the status of queued invalidation enable
operation through QIES field in the Global Status register.
The value returned on a read of this field is undefined.
Interrupt Remapping Enable (IRE)
This field is valid only for implementations supporting interrupt
remapping.
0 = Disable interrupt-remapping hardware
1 = Enable interrupt-remapping hardware
Hardware reports the status of the interrupt remapping enable
operation through the IRES field in the Global Status register.
There may be active interrupt requests in the platform when
software updates this field. Hardware must enable or disable
interrupt-remapping logic only at deterministic transaction
boundaries, so that any in-flight interrupts are either subject to
remapping or not at all.
25
WO
0b
Uncore
Hardware implementations must drain any in-flight interrupts
requests queued in the Root-Complex before completing the
interrupt-remapping enable command and reflecting the status of
the command through the IRES field in the Global Status register.
The value returned on a read of this field is undefined.
Datasheet, Volume 2
269
INTEL [ INTEL ]
