Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
default mapping of the NVDIMM Block Data Window Region shall be WB memory attributes with
AddressRangeReserved type in E820 and EfiMemoryMappedIO type in UEFI GetMemoryMap.
Table 5-128 System Physical Address Range Structure
Field
Byte
Length
Byte
Offset
Description
Type 2 0 0 - System Physical Address Range Structure
Length 2 2 Length in bytes for entire structure.
SPA Range Structure
Index
2 4 Used by Memory Device to System Address Range
Mapping Structure to uniquely refer to this structure.
Value of 0 is Reserved and shall not be used as an
index.
Flags 2 6 Bit [0] set to 1 indicates that Control region is strictly
for management during hot add/online operation.
Bit [1] set to 1 to indicate that data in Proximity
Domain field is valid.
Bits [15:2] : Reserved
Reserved 4 8 Reserved
Proximity Domain 4 12 Integer that represents the proximity domain to which
the memory belongs. This number must match with
corresponding entry in the SRAT table.
Address Range Type GUID 16 16 GUID that defines the type of the Address Range
Type. The GUID can be any of the values defined in
this section, or a vendor defined GUID.
System Physical Address 8 32 Start Address of the System Physical Address Range
Range Base
System Physical Address
Range Length
8 40 Range Length of the region in bytes
Address Range Memory
Mapping Attribute
8 48 Memory mapping attributes for this address range:
EFI_MEMORY_UC = 0x00000001
EFI_MEMORY_WC = 0x00000002
EFI_MEMORY_WT = 0x00000004
EFI_MEMORY_WB = 0x00000008
EFI_MEMORY_UCE = 0x00000010
EFI_MEMORY_WP = 0x00001000
EFI_MEMORY_RP = 0x00002000
EFI_MEMORY_XP = 0x00004000
EFI_MEMORY_NV = 0x00008000
EFI_MEMORY_MORE_RELIABLE = 0x00010000
If EFI_MEMORY_NV is set, then Address Range
Type field in this structure shall be set to “Byte
Addressable Persistent Memory” and vice versa.
These types can be OR’d together as needed.
Refer to UEFI Specification for memory attributes
description
204 April, 2015 Version 6.0