Case 2: Greater Than 4 Gb Of Physical Memory - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 2 01-2011 Datasheet

Case 2: Greater than 4 GB of Physical Memory

Figure 2-6. Case 2: Greater than 4 GB of Physical Memory
TOUUD BASE
Reclaim Limit =
Reclaim Base + x
Reclaim BASE
TOLUD BASE
1 MB aligned
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.
Example: 5 GB of Physical Memory, with 1 GB allocated to Memory Mapped IO:
• Populated Physical Memory = 5 GB
• Address Space allocated to memory mapped IO (including Flash, APIC, and Intel
TXT) = 1 GB
• Remapped Physical Memory = 1 GB
• TOM – 01_4000_0000h (5 GB)
• ME stolen size – 00000b (0 MB)
• TOUUD – 01_8000_0000h (6 GB) (1 MB aligned)
• TOLUD – 00_C000_000h (3 GB)
• REMAPBASE – 01_4000_0000h (5 GB)
• REMAPLIMIT – 01_7FF0_0000h (6 GB-1)
30
HOST/SYSTEM VIEW
512 GB
High PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
Main
1 MB aligned
Memory
Reclaim
Add Range
1 MB aligned
Main
memory
Address
Range
Flash, APIC
Intel TXT
FEC0_0000
(20 MB)
PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
TSEG
Main
Memory
Add Range
1 MB
Legacy
Add. Range
0
Processor Configuration Registers
PHYSICAL MEMORY
(DRAM CONTROLLER VIEW)
TOM
MESEG BASE
4 GB
X
GFX Stolen BASE
GFX GTT Stolen BASE
TSEG BASE
1 MB aligned
ME-UMA
1 MB aligned
OS visible
> 4 GB
OS invisible
Reclaim
1 MB aligned
for reclaim
GFX Stolen
(0–256 MB)
1 MB aligned
GFX GTT
STOLEN
(0–2 MB)
1 MB aligned
TSEG
(0–8 MB)
1 MB aligned
OS
VISIBLE
< 4 GB
0
Datasheet, Volume 2