AC82G41SLGQ3 Datasheet, PDF (463/604 Pages) Intel Corporation – Intel® 4 Series Chipset Family

Intel^® Virtualization Technology for Directed I/O Registers (D0:F0) (Intel^® 82Q45 GMCH Only)
Bit
Access
Default
Value
RST/PWR
Description
30
W
29
RO
Set Root Table Pointer (SRTP): Software sets this field
to set/update the root-entry table pointer used by
hardware. The root-entry table pointer is specified through
the Root-entry Table Address register.
Hardware reports the status of the root table pointer set
operation through the RTPS field in the Global Status
register.
The root table pointer set operation must be performed
before enabling or re-enabling (after disabling)
DMAremapping hardware.
After a root table pointer set operation, software must
0b
Core
globally invalidate the context cache followed by global
invalidate of IOTLB. This is required to ensure hardware
uses only the remapping structures referenced by the new
root table pointer, and not any stale cached entries.
While DMA-remapping hardware is active, software may
update the root table pointer through this field. However,
to ensure valid in-flight DMA requests are deterministically
remapped, software must ensure that the structures
referenced by the new root table pointer are programmed
to provide the same remapping results as the structures
referenced by the previous root table pointer.
Clearing this bit has no effect.
Value returned on read of this field is undefined.
Set Fault Log (SFL): This field is valid only for
implementations supporting advanced fault logging. If
advanced fault logging is not supported, writes to this field
are ignored.
Software sets this field to request hardware to set/update
the fault-log pointer used by hardware. The fault-log
pointer is specified through Advanced Fault Log register.
Hardware reports the status of the fault log set operation
0b
Core
through the FLS field in the Global Status register. The fault
log pointer must be set before enabling advanced fault
logging (through EAFL field). Once advanced fault logging
is enabled, the fault log pointer may be updated through
this field while DMA-remapping hardware is active.
Clearing this bit has no effect. Value returned on read of
this field is undefined.
NOTE: This field is reserved as this feature is not
supported.
Datasheet
463