Advanced Configuration and Power Interface Specification

ACPI Software Programming Model
Reserved 29 3 Must be zero.
5.2.16.3 Processor Local x2APIC Affinity Structure
The Processor Local x2APIC Affinity structure provides the association between the local x2APIC
ID of a processor and the proximity domain to which the processor belongs. Table 5-75 provides the
details of the Processor Local x2APIC Affinity structure.
Table 5-75 Processor Local x2APIC Affinity Structure
Field
Byte
Length
Byte
Offset
Description
Type 1 0 2 Processor Local x2APIC Affinity Structure
Length 1 1 24
Reserved 2 2 Reserved – Must be zero
Proximity Domain 4 4 The proximity domain to which the logical processor belongs.
X2APIC ID 4 8 The processor local x2APIC ID.
Flags 4 12 Same as Processor Local APIC/SAPIC Affinity Structure flags. See
Table 5-72 for a description of this field.
Clock Domain 4 16 The clock domain to which the logical processor belongs. See
Section 6.2.1, “_CDM (Clock Domain)”.
Reserved 4 20 Reserved.
On x86-based platforms, the OSPM uses the Hot Pluggable bit to determine whether it should shift
into PAE mode to allow for insertion of hot-plug memory with physical addresses over 4 GB.
5.2.16.4 GICC Affinity Structure
The GICC Affinity Structure provides the association between the ACPI Processor UID of a
processor and the proximity domain to which the processor belongs. Table 5-76 provides the details
of the GICC Affinity structure.
Table 5-76 GICC Affinity Structure
Field
Byte
Length
Byte
Offset
Description
Type 1 0 3 GICC Affinity Structure.
Length 1 1 18
Proximity Domain 4 2 The proximity domain to which the logical processor belongs.
ACPI Processor 4 6 The ACPI Processor UID of the associated GICC.
UID
Flags 4 10 Flags – GICC Affinity Structure. See Table 5-77 for a description of
this field.
Clock Domain 4 14 The clock domain to which the logical processor belongs. See
Section 6.2.1, “_CDM (Clock Domain)”.
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