Advanced Configuration and Power Interface Specification

ACPI Software Programming Model
Table 5-88 MPST Table Structure
Field
Byte
Length
Byte
Offset
Description
Header
Signature 4 0 ‘MPST’. Signature for Memory Power State Table
Length 4 4 Length in bytes for entire MPST. The length implies the
number of Entry fields at the end of the table
Revision 1 8 1
Checksum 1 9 Entire table must sum to zero
OEMID 6 10 OEM ID
OEM Table ID 8 16 For the memory power state table, the table ID is the
manufacturer model ID
OEM Revision 4 24 OEM revision of memory power state Table for supplied
OEM Table ID
Creator ID 4 28 Vendor ID of utility that created the table
Creator Revision 4 32 Revision of utility that created the table
Memory PCC
MPST Platform
Communication Channel
Identifier
1 36 Identifier of the MPST Platform Communication Channel.
Reserved 3 37 Reserved
Memory Power Node
Memory Power Node 2 40 Number of Memory power Node structure entries
Count
Reserved 2 42 Reserved
Memory Power Node
Structure[ Memory Power
Node Count]
Memory Power State
Characteristics
Memory Power State
Characteristics Count
--- --- This field provides information on the memory power
nodes present in the system. The information includes
memory node id, power states supported & associated
latencies. Further details of this field are specified in
Section 5.2.21.4
2 --- Number of Memory power State Characteristics
Structure entries
Reserved 2 Reserved
Memory Power State
Characteristics Structure
[m]
--- --- This field provides information of memory power states
supported in the system. The information includes power
consumed, transition latencies, relevant flags.
5.2.21.1 MPST PCC Sub Channel
The MPST PCC Sub Channel Identifier value provided by the platform in this field should be
programmed to the Type field of PCC Communications Subspace Structure. The MPST table
references its PCC Subspace in a given platform by this identifier, as shown in Table 5-88.
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