Intel i7-3920XM Extreme AW8063801009607 User Manual

268

Datasheet, Volume 2

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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 (RTA_REG) register. 
Hardware reports the status of the "Set Root Table Pointer" 

operation through the RTPS field in the Global Status register.
The "Set Root Table Pointer" operation must be performed before 

enabling or re-enabling (after disabling) DMA remapping through 

the TE field.
After a "Set Root Table Pointer" operation, software must globally 

invalidate the context cache and then globally invalidate of 

IOTLB. This is required to ensure hardware uses only the 

remapping structures referenced by the new root table pointer, 

and not 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. The value returned on read of this 

field is undefined.

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Set Fault Log (SFL) 
This field is valid only for implementations supporting advanced 

fault logging.
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 'Set Fault Log' operation 

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 is active.
Clearing this bit has no effect. The value returned on read of this 

field is undefined.

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Enable Advanced Fault Logging (EAFL) 
This field is valid only for implementations supporting advanced 

fault logging.
Software writes to this field to request hardware to enable or 

disable advanced fault logging:
0 = Disable advanced fault logging. In this case, translation 

faults are reported through the Fault Recording registers.

1 = Enable use of memory-resident fault log. When enabled, 

translation faults are recorded in the memory-resident log. 

The fault log pointer must be set in hardware (through the 

SFL field) before enabling advanced fault logging. Hardware 

reports the status of the advanced fault logging enable 

operation through the AFLS field in the Global Status 

register.

The value returned on read of this field is undefined.