Processor Configuration Registers
2.3.4.5.2
Case 2 – Greater than 4 GB of Physical Memory
Figure 2-6. Case 2 – Greater than 4 GB of Physical Memory
Physical Memory
(DRAM Controller View)
Host/System View
512 GB
High PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
TOM
1 MB aligned
1 MB aligned
TOUUD BASE
Reclaim Limit =
Main
Reclaim Base + x
ME-UMA
1 MB aligned
Memory
Reclaim
Add Range
MESEG BASE
Reclaim BASE
1 MB aligned
Main
memory
Address
Range
OS visible
> 4 GB
4 GB
Flash, APIC
Intel® TXT
(20 MB)
OS invisible
Reclaim
FEC0_0000
X
1 MB aligned
for reclaim
TOLUD BASE
1 MB aligned
PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
GFX Stolen
(0-256 MB)
GFX Stolen BASE
1 MB aligned
1 MB aligned
1 MB aligned
GFX GTT
STOLEN
(0-2 MB)
GFX GTT Stolen BASE
TSEG
(0-8 MB)
TSEG
TSEG BASE
Main
Memory
OS
Add Range
VISIBLE
< 4GB
1 MB
0
Legacy
Add. Range
0
In this case the amount of memory remapped is the range between TOLUD and 4 GB.
This physical memory will be mapped to the logical address range defined between the
REMAPBASE and the REMAPLIMIT registers.
32
Datasheet, Volume 2
INTEL [ INTEL ]
