Datasheet

Processor Configuration Registers
32 Datasheet, Volume 2
2.2.3.1.4 Case 4 — Greater than 4 GB of Physical Memory, Remap
Note: Internal graphics is not supported on the Intel Xeon processor L3406.
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 Physical Memory, with 1 GB allocated to Memory Mapped I/O
• Populated Physical Memory = 5 GB
• Address Space allocated to memory mapped I/O = 1 GB
• Remapped Physical Memory = 1 GB
• TOM – 050h (5 GB)
• ME stolen size – 00000b (0 MB)
• TOUUD – 17FFh (6 GB – 1 MB) (1 MB aligned)
• TOLUD – 06000h (3 GB) (64 MB aligned because remap is enabled and the remap
register has 64 MB granularity)
• REMAPBASE – 050h (5GB)
• REMAPLIMIT – 05Fh (6 GB – 1 boundary)
Figure 2-8. Greater than 4 GB, Remap Enabled
“LOW
DRAM”
DRAM
ABOVE
4 GB
4 GB
MEMORY
RECLAIM
REGION
64 GB
RECLAIM BASE
RECLAIM LIMIT =
RECLAIM BASE + x
OS
VISIBLE
< 4 GB
PCI MMIO
OS
INVISIBLE
RECLAIM
OS
VISIBLE
>4 GB
GFX
STOLEN
(0-64 MB)
EP-UMA
(1-64 MB)
TOM
HOST/SYSTEM VIEW
PHYSICAL MEMORY
(DRAM CONTROLLER VIEW)
TSEG
TSEG
(0-8 MB)
X
0
0
HMMIO
TSEG BASE
GFX Stolen BASE
EP Stolen BASE
1 MB aligned
1 MB aligned
64 MB aligned
1 MB aligned
64 MB aligned
64 MB aligned
64 MB aligned for reclaim
0 MB –
63 MB
Wasted
64 MB aligned
TOLUD BASE
64 MB aligned
GFX GTT
(0-64 MB)
GFX GTT Stolen BASE
1 MB aligned