Intel i7-2600 CM8062300834302S User Manual

Datasheet, Volume 2

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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. 
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. 

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Compatibility Format Interrupt (CFI)
This field is valid only for Intel 64 implementations supporting 

interrupt-remapping.
Software writes to this field to enable or disable Compatibility 

Format interrupts on Intel 64 platforms. The value in this field is 

effective only when interrupt-remapping is enabled and Extended 

Interrupt Mode (x2APIC mode) is not enabled.
0 = Block Compatibility format interrupts.

1 = Process Compatibility format interrupts as pass-through 

(bypass interrupt remapping).

Hardware reports the status of updating this field through the CFIS 

field in the Global Status register.
The value returned on a read of this field is undefined. 

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