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Datasheet, Volume 2 263
Processor Configuration Registers
26 RO 0b
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.
1 = Enable use of queued invalidations.
Hardware reports the status of queued invalidation enable operation through
QIES field in the Global Status register.
Refer to the VTd specification for software requirements for
enabling/disabling queued invalidations.
The value returned on a read of this field is undefined.
25 RO 0b
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.
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.
24 RO 0b
Set Interrupt Remap Table Pointer (SIRTP)
This field is valid only for implementations supporting interrupt-remapping.
Software sets this field to set/update the interrupt remapping table pointer
used by hardware. The interrupt remapping table pointer is specified through
the Interrupt Remapping Table Address register.
Hardware reports the status of the interrupt remapping table pointer set
operation through the IRTPS field in the Global Status register.
The interrupt remap table pointer set operation must be performed before
enabling or re-enabling (after disabling) interrupt-remapping hardware
through the IRE field.
After an interrupt remap table pointer set operation, software must globally
invalidate the interrupt entry cache. This is required to ensure hardware uses
only the interrupt-remapping entries referenced by the new interrupt remap
table pointer, and not any stale cached entries.
While interrupt remapping is active, software may update the interrupt
remapping table pointer through this field. However, to ensure valid in-flight
interrupt requests are deterministically remapped, software must ensure that
the structures referenced by the new interrupt remap table pointer are
programmed to provide the same remapping results as the structures
referenced by the previous interrupt remap table pointer.
Clearing this bit has no effect. The value returned on a read of this field is
undefined.
B/D/F/Type: 0/2/0/GFXVTBAR
Address Offset: 18–1Bh
Reset Value: 00000000h
Access: W, RO, RW
Bit Attr
Reset
Value
Description
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