Advanced Configuration and Power Interface Specification

ACPI Software Programming Model
Software should construct the device address space (accounting for interleave) before applying
the block control start offset.
5.2.25.6 NVDIMM Block Data Window Region Structure
This structure shall be provided only if the number of Block Data Windows is non-zero.
Table 5-134 NVDIMM Block Data Windows Region Structure
Field
Byte
Length
Byte
Offset
Description
Type 2 0 5 - NVDIMM Block Data Window Region
Structure
Length 2 2 Length in bytes for entire structure.
NVDIMM Control Region
Structure Index
Number of Block Data
Windows
Block Data Window Start
Offset
2 4 Provides association for the corresponding
NVDIMM Control Region. Shall be Non-zero.
2 6 Number of Block Data Windows shall match the
corresponding number of Block Control
Windows.
8 8 In Bytes.
Logical offset. Refer to Note2. The start of the
subsequent Block Data Window is calculated by
adding Size of Block Data Window.
Size of Block Data Window 8 16 In Bytes
Block Accessible Memory
Capacity
Beginning address of first
block in Block Accessible
Memory
8 24 In Bytes
8 32 In Bytes. The address of the next block is
obtained by adding the value of this field to Size
of Block Data Window.
Note: Logical offset in table above refers to offset from the start of NVDIMM Data Window Region. The
logical offset is with respect to the device not with respect to system physical address space.
Software should construct the device address space (accounting for interleave) before applying
the Block Data Window start offset.
5.2.25.7 Flush Hint Address Structure
Software needs an assurance of durability (i.e. a guarantee that the writes have reached the target
NVDIMM) after writing to a NVDIMM region. Flush Hint feature is platform specific and if
supported, the platform exposes this durability mechanism to OSPM by providing a Flush Hint
Address Structure.
For a given NVDIMM (as indicated by the NFIT Device Handle in the Flush Hint Address
structure), software can write to any one of these Flush Hint Addresses to cause any preceding writes
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