Intel i7-2600 CM8062300834302S User Manual
Product codes
CM8062300834302S
Datasheet, Volume 2
75
Processor Configuration Registers
2.5.26
TOM—Top of Memory Register
This register contains the size of physical memory. BIOS determines the memory size
reported to the OS using this register.
reported to the OS using this register.
B/D/F/Type:
0/0/0/PCI
Address Offset:
A0–A7h
Reset Value:
0000_007F_FFF0_0000h
Access:
RW-KL, RW-L
Size:
64 bits
BIOS Optimal Default
000_0000_0000h
Bit
Attr
Reset
Value
RST/
PWR
Description
63:39
RO
0h
Reserved
38:20
RW-L
7FFFFh
Uncore
Top of Memory (TOM)
This register reflects the total amount of populated physical
This register reflects the total amount of populated physical
memory. This is NOT necessarily the highest main memory address
(holes may exist in main memory address map due to addresses
allocated for memory mapped IO). These bits correspond to
address bits 38:20 (1 MB granularity). Bits 19:0 are assumed to be
0. All the bits in this register are locked in Intel TXT mode.
19:1
RO
0h
Reserved
0
RW-KL
0b
Uncore
Lock (LOCK)
This bit will lock all writeable settings in this register, including
This bit will lock all writeable settings in this register, including
itself.