Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Field Byte Length Byte Offset Description
Flags (OUTPUT) 2 40 The platform returns this value in response
to GET_PATROL_PARAMETERS
Bit [0]: Will be set if patrol scrubber is
already running for address range specified
in “Actual Address Range”
Bits [3:1]: Current Patrol Speeds, if Bit [0] is
set
000b – Slow
100b – Medium
111b – Fast
All other combinations are reserved.
Bits [15:4]: RESERVED
Requested Speed
(INPUT)
1 42 The OSPM Sets this field as follows, for the
START_PATROL_SCRUBBER command
Bit [0]: Will be set if patrol scrubber is
already running for address range specified
in “Actual Address Range”
Bits [2:0]: Requested Patrol Speeds
000b – Slow
100b – Medium
111b – Fast
All other combinations are reserved.
Bits [7:3]: RESERVED
5.2.20.5.1 Sequence of Operations:
The following sequence documents the steps for OSPM to identify whether the platform supports
hardware based patrol scrub and invoke commands to request hardware to patrol scrub the specified
address range.
1. Identify whether the platform supports hardware based patrol scrub and exposes the support to
software by reading the RAS capabilities bitmap in RASF table
2. Call GET_PATROL_PARAMETERS, by setting the Requested Address Range.
3. Platform Returns Actual Address Range and Flags.
4. Based on the above two data, if the OPSM decides to start the patrol scrubber or change the
speed of the patrol scrubber, then the OSPM calls START_PATROL_SCRUBBER, by setting
the Requested Address Range and Requested Speed.
5.2.21 Memory Power StateTable (MPST)
The following table describes the structure of new ACPI memory power state table (MPST). This
table defines the memory power node topology of the configuration, as described earlier in
170 April, 2015 Version 6.0