Processor Configuration Registers
Figure 2-1. System Address Range Example
Physical Memory
(DRAM Controller View)
Host/System View
512 GB
PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
TOM
1 MB aligned
1 MB aligned
TOUUD BASE
Reclaim Limit =
Reclaim Base + x
Main
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
< 4 GB
1 MB
0
Legacy
Add. Range
0
2.3.1
Legacy Address Range
This area is divided into the following address regions:
• 0–640 KB – DOS Area
• 640–768 KB – Legacy Video Buffer Area
• 768–896 KB in 16 KB sections (total of 8 sections) – Expansion Area
• 896–960 KB in 16 KB sections (total of 4 sections) – Extended System BIOS Area
• 960 KB–1 MB Memory – System BIOS Area
Datasheet, Volume 2
19
INTEL [ INTEL ]
