Intel® Processor Vendor-Specific ACPI
Interface Specification
December 2014
Revision 007
Document Number: 302223-007
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Interface Specification
Contents
1
2
3
Introduction ...................................................................................................... 5
1.1 Overview ............................................................................................... 5
OSPM Capabilities Interfaces ............................................................................... 6
2.1 _PDC (Processor Driver Capabilities) .......................................................... 6
2.2 _OSC (Operating System Capabilities) ....................................................... 7
Functional Fixed Hardware Interfaces................................................................... 10
3.1 Functional Fixed Hardware ...................................................................... 10
3.2 _PCT (Performance Control) .................................................................... 11
3.3 _CST (C States) ..................................................................................... 11
3.4 _PTC (Processor Throttling Control) .......................................................... 12
Tables
Table 1. _PDC Capabilities DWORD 2 Bit Definitions ................................................ 7
Table 2. Intel FFH GAS Structure Field Names ....................................................... 10
Table 3. _PCT FFH GAS Field Encoding ................................................................. 11
Table 4. _CST FFH GAS Field Encoding ................................................................. 12
Table 5. _PTC FFH GAS Field Encoding ................................................................. 12
Interface Specification
3
Revision History
Revision Number
001
002
003
004
005
006
Description
Initial release
Updated to include ACPI 3.0 reference information
FFH description updates
Expanded _PDC bit definition. Renamed document to comprehend
general ACPI Functional Fixed Hardware (FFH) interface definitions and
vendor specific object interfaces.
Added _PDC[11] bit definition
Added _PDC / _OSC [12] bit definition
Revision Date
April 2004
May 2004
June 2005
March 2006
September 2006
January 2014
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Interface Specification
Introduction
1
1.1
Introduction
Overview
The Advanced Configuration and Power Interface (ACPI) specification describes a
number of interfaces that are vendor specific. These include both the concept of the
“Function Fixed Hardware” (FFH) interface, which was introduced in revision 2.0, as
well as vendor-specific ACPI namespace object definitions.
For specific interfaces, ACPI allows a functional equivalent interface to be declared and
implemented via vendor specific hardware registers along with vendor prescribed
software manipulation of these registers. It is the vendor’s responsibility to convey the
interface’s register descriptions and required software manipulation
Read the full Intel® Processor Vendor-Specific
ACPI.