CP80617004119AES LBU3 Intel, CP80617004119AES LBU3 Datasheet - Page 264
CP80617004119AES LBU3
Manufacturer Part Number
CP80617004119AES LBU3
Description
Manufacturer
Intel
Datasheet
1.CP80617004119AES_LBU3.pdf
(388 pages)
Specifications of CP80617004119AES LBU3
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264
Bit
25
24
Access
W
W
Default
Value
0b
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.
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.
(Sheet 4 of 5)
Description
Processor Configuration Registers
Datasheet
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