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
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 (IRTA_REG) register.
Hardware reports the status of the 'Set Interrupt Remap Table
Pointer’ operation through the IRTPS field in the Global Status
register.
The 'Set Interrupt Remap Table Pointer' operation must be
performed before enabling or re-enabling (after disabling)
interrupt-remapping hardware through the IRE field.
After a 'Set Interrupt Remap Table Pointer' 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.
24
WO
0b
Uncore
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.
23:0
RO
0h
Reserved (RSVD)
270
Datasheet, Volume 2
INTEL [ INTEL ]
