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Datasheet, Volume 2 17
Processor Configuration Registers
Figure 2-1 represents system memory address map in a simplified form.
Figure 2-1. System Address Range Example
Main
Memory
Add Range
OS
VISIBLE
< 4 GB
PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
HOST/SYSTEM VIEW
PHYSICAL MEMORY
(DRAM CONTROLLER VIEW)
TSEG
0
0
TSEG BASE
GFX Stolen
(0-256 MB)
ME-UMA
TOM
GFX GTT Stolen BASE
MESEG BASE
1 MB aligned
1 MB aligned
OS invisible
Reclaim
1 MB aligned
for reclaim
1 MB aligned
4 GB
FEC0_0000
1 MB aligned
TOUUD BASE
1 MB aligned
GFX GTT
STOLEN
(0-2 MB)
GFX Stolen BASE
1 MB aligned
TSEG
(0-8 MB)
Legacy
Add. Range
1 MB
Main
memory
Address
Range
OS visible
> 4 GB
Main
Memory
Reclaim
Add Range
Reclaim BASE
Reclaim Limit =
Reclaim Base + x
1 MB aligned
PCI
Memory
Add. Range
(subtractively
decoded to
DMI)
1 MB aligned
512 GB
X
Flash, APIC
Intel TXT
(20 MB)
TOLUD BASE
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