Advanced Configuration and Power Interface Specification

ACPI Software Programming Model
Field
Byte
Length
Byte
Offset
Description
Proximity Domain [m] 4*m 32 Proximity domains for memory address space(s) spawned
by this memory controller. Each proximity domain is a 4-byte
entity as defined in the System Resource Allocation Table
(SRAT).
Physical Component
Identifier Structure [n]
__ - A list of Physical Components structures for this memory
controller. See Table 5-102.
Table 5-102 Physical Components Identifier Structure
Field
Byte
Length
Byte
Offset
Description
Type 1 0 2– DIMM
Reserved 1 1 Reserved, must be zero.
Length 2 2 Length in bytes for this Structure.
Flag 2 4 Bit [0] – Set 0 to indicate that this is not a top level memory
aggregator. DIMM is typically behind a memory controller or
a socket device or both.
Bit [1] – set to 1 to indicate physical element of the topology.
Set to 0 to indicate logical element of topology
Bit [2] and [3] –
• If 00, indicates that all components aggregated by this
device implements volatile memory
• If 01, indicates that components aggregated by this
device implements both volatile and non-volatile memory
• If 10, indicates that all components aggregated by this
device implements non-volatile memory
• 11 - Reserved
Bit [4] – Bit [15] Reserved
Reserved 2 6 Reserved, must be zero.
Physical Component
Identifier
2 8 Uniquely identifies the physical memory component in the
system.
Reserved 2 10 Reserved, must be zero.
Size of DIMM 4 12 Size in MB of the DIMM device.
SMBIOS Handle 4 16 Refers to Type 17 table handle of corresponding SMBIOS
record. The platform indicates that this field is not valid by
setting a value of 0xFFFFFFFF. If the platform provides a
valid handle, the upper 2 bytes must be 0 ( since SMBIOS
handles are 2 bytes only).
NOTE: The use of this handle is for management software to
be able to cross-reference the physical DIMM described in
SMBIOS against the topology described in this table. It is not
expected that OSPM will utilize this field.
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