Intel i7-3920XM Extreme AW8063801009607 Manual De Usuario

34

Datasheet, Volume 2

MSI Interrupts

At fixed address below 4 GB

GMADR

64 bit BARs 

GTTMMADR

64 bit BARs MBASE/MLIMIT

PXPEPBAR

39 bit BAR 

DMIBAR

39 bit BAR

MCHBAR

39 bit BAR

TMBAR

64 bit BAR

PMBASE/PMLIMIT

64 bit BAR (using Upper PMBASE/PMLIMIT)

CHAPADR

64 bit BAR

GFXVTBAR

39 bit BARs 

VTDPVC0BAR

39 bit BARs

• Remap applies to transactions from all interfaces. All upstream PEG/DMI 

transactions that are snooped get remapped. 

• Upstream PEG/DMI transactions that are not snooped (“Snoop not required” 

attribute set) get remapped.

• Upstream reads and writes above TOUUD are treated as invalid cycles.
• Remapped addresses remap starting at TOLUD. They do not remap starting at 

TSEG_BASE. DMI and PEG need to be careful with this for both snoop and non-
snoop accesses. In other words, for upstream accesses, the range between  

(TOLUD – GfxStolensize – GFXGTTstolensize – TSEGSIZE-DPR) to TOLUD) will 
never map directly to memory.

Accesses from PEG/DMI should be decoded as to the type of access before they are 

remapped. For instance, a DMI write to FEEx_xxxxh is an interrupt transaction, but 

there is a DMI address that will be re-mapped to the DRAM address of FEEx_xxxxh. In 

all cases, the remapping of the address is done only after all other decodes have taken 

place.

Accesses that don’t hit DRAM or PCI space are subtractive decoded to DMI. Because the 
TOLUD register is used to mark the upper limit of DRAM space below the 4 GB 
boundary, no address between TOLUD and 4 GB ever decodes directly to main memory. 
Thus, even if remap is disabled, any address in this range has a non-memory 
destination. 

The top of DRAM address space is either:

• TOLUD if there is less than 4 GB of DRAM or 32-bit addressing or 
• TOUUD if there is more than 4 GB of DRAM and 36-bit addressing

The system address space includes the remapped range. For instance, if there is 8 GB 

of DRAM and 1 GB of PCI space, the system has a 9 GB address space, where DRAM 

lies from 0–3 GB and 4–9 GB. BIOS will report an address space of 9 GB to the 

operating system.