Advanced Configuration and Power Interface Specification

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Thermal Management 558 Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba
Advanced Configuration and Power Interface Specification 12 ACPI Embedded Controller Interface Specification ACPI defines a standard hardware and software communications interface between an OS driver and an embedded controller. This allows any OS to provide a standard driver that can directly communicate with an embedded controller in the system, thus allowing other drivers within the system to communicate with and use the resources of system embedded controllers. This in turn enables the OEM to provide platform features that the OS OSPM and applications can take advantage of. ACPI also defines a standard hardware and software communications interface between an OS driver and an Embedded Controller-based SMB-HC (EC-SMB-HC). The ACPI standard supports multiple embedded controllers in a system, each with its own resources. Each embedded controller has a flat byte-addressable I/O space, currently defined as 256 bytes. Features implemented in the embedded controller have an event “query” mechanism that allows feature hardware implemented by the embedded controller to gain the attention of an OS driver or ASL/AML code handler. The interface has been specified to work on the most popular embedded controllers on the market today, only requiring changes in the way the embedded controller is “wired” to the host interface. Two interfaces are specified: • A private interface, exclusively owned by the embedded controller driver. • A shared interface, used by the embedded controller driver and some other driver. This interface is separate from the traditional PC keyboard controller. Some OEMs might choose to implement the ACPI Embedded Controller Interface (ECI) within the same embedded controller as the keyboard controller function, but the ECI requires its own unique host resources (interrupt event and access registers). This interface does support sharing the ECI with an inter-environment interface (such as SMI) and relies on the ACPI-defined “Global Lock” protocol. Note, however, that HW-reduced ACPI platforms, which do not support the Global Lock, cannot share the EC interface. For information about the Global Lock interface, see Section 5.2.10.1, “Global Lock.” Both the shared and private EC interfaces are described in the following sections. The ECI has been designed such that a platform can use it in either the legacy or ACPI modes with minimal changes between the two operating environments. This is to encourage standardization for this interface to enable faster development of platforms as well as opening up features within these controllers to higher levels of software. 12.1 Embedded Controller Interface Description Embedded controllers are the general class of microcontrollers used to support OEM-specific implementations. The ACPI specification supports embedded controllers in any platform design, as Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba 559
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FACP - Flag Bit Length Advanced Con
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MEMORY_POWER _STATUS_REGIST ER Adva
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Table 5-87 Flag format Advanced Con
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Table 5-93 Socket Structure Advance
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Root R \_PR P \PID0 \_SB d CPU0 _ST
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Hex value Description Advanced Conf
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Arguments: (1) Advanced Configurati
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5.7.5 _DLM (DeviceLock Mutex) Advan
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Return Value: None Advanced Configu
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6.1.2 _CID (Compatible ID) Advanced
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Device(BUS0) { } Advanced Configura
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Example: Advanced Configuration and
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Scope(\_SB.PCI0) { Advanced Configu
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Return Value: None Argument Informa
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Status Code Description 0xA0-0xFFFF
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Arguments: None Return Value: Advan
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Offset Field Name Advanced Configur
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6.4.2.7 Fixed DMA Descriptor Advanc
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Byte 3 Interrupt Vector Flags Advan
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Byte 11 Byte 12 Byte 13 Byte 14 Adv
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6.5.7 _GLK (Global Lock) Advanced C
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7.1.3 _ON Advanced Configuration an
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Object Description Advanced Configu
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8.4 Declaring Processors Advanced C
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} Advanced Configuration and Power
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Example Advanced Configuration and
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Element Object Type Counter Wraparo
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8.4.5.1.2.1 Maximum Performance Reg
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} }) Advanced Configuration and Pow
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8.5.2 OSPM _OST Evaluation Advanced
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9.2.1 Overview Advanced Configurati
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Return Value: Advanced Configuratio
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} } } }) Advanced Configuration and
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9.12.4 Example: Memory Device Scope
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Host Interface Advanced Configurati
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10.2.1 Battery Events Advanced Conf
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16.1 Sleeping States Advanced Confi
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Result // Target� ) => Integer Ad
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) DebugTerm :=� Debug Advanced Co
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) Advanced Configuration and Power
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Result // Target� ) => Advanced
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Transfer8 | Transfer16 | Transfer8_
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19.2.4 ASL Macros Advanced Configur
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EISAID FromBCD ToBCD Advanced Confi
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To convert from an object of this D
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Break BreakPoint Case Continue Defa
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Arguments Advanced Configuration an
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Arguments Addend is evaluated as an
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Name (CNT, 5) Store (CNT, Local0) A
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DefSleep := SleepOp MsecTime SleepO
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Encoding Value Advanced Configurati
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Encoding Value Advanced Configurati
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\ S0 S1 MEM MEM CPU SET GET SET GET
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State Status Definition Advanced Co
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Primary Desktop Secondary Desktop T
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Symbols _EJx 301 A AC adapter devic
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primary terms 678 reserved object n
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Case (Conditional Execution) 728 ca
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D1 Device State definition 27 trans
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EFI definition 19 GetMemoryMap inte
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definition 20 events 20 registers 2
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hung systems 75, 76 hysteresis 522
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LNotEqual (Logical Not Equal) 769 L
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Notification Temperature Threshold
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implementation requirements 10 pass
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performance states 43 performance v
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estoring system context 619 results
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commands, restricted 580 data buffe
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throttling 387, 400 THT_EN 90 Timer
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