Advanced Configuration and Power Interface Specification

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Advanced Configuration and Power Interface Specification as type Descriptor.Type . . . } while (Regs.ebx != 0); if (!E820Present) { . . . call INT-15 88 and/or INT-15 E801 to obtain old style memory information . . . } . 690 April, 2015 Version 6.0
Waking and Sleeping 16 Waking and Sleeping ACPI defines a mechanism to transition the system between the working state (G0) and a sleeping state (G1) or the soft-off (G2) state. During transitions between the working and sleeping states, the context of the user’s operating environment is maintained. ACPI defines the quality of the G1 sleeping state by defining the system attributes of four types of ACPI sleeping states (S1, S2, S3, and S4). Each sleeping state is defined to allow implementations that can tradeoff cost, power, and wake latencies. Additionally, ACPI defines the sleeping states such that an ACPI platform can support multiple sleeping states, allowing the platform to transition into a particular sleeping state for a predefined period of time and then transition to a lower power/higher wake latency sleeping state (transitioning through the G0 state) 1 . ACPI defines a programming model that provides a mechanism for OSPM to initiate the entry into a sleeping or soft-off state (S1-S5); this consists of a 3-bit field SLP_TYPx 2 that indicates the type of sleep state to enter, and a single control bit SLP_EN to start the sleeping process. On HW-reduced ACPI systems, the register described by the SLEEP_CONTROL_REG field in the FADT is used instead of the fixed SLP_TYPx and SLP_EN register bit fields. Note: Systems containing processors without a hardware mechanism to place the processor in a lowpower state may additionally require the execution of appropriate native instructions to place the processor in a low-power state after OSPM sets the SLP_EN bit. The hardware may implement a number of low-power sleeping states and then associate these states with the defined ACPI sleeping states (through the SLP_TYPx fields). The ACPI system firmware creates a sleeping object associated with each supported sleeping state (unsupported sleeping states are identified by the lack of the sleeping object). Each sleeping object contains two constant 3-bit values that OSPM will program into the SLP_TYPa and SLP_TYPb fields (in fixed register space), or, on HWreduced ACPI platforms, a single 3-bit value that OSPM will write to the register specified by the FADT's SLEEP_CONTROL_REG field. On systems that are not HW-reduced ACPI platforms, an alternate mechanism for entering and exiting the S4 state is defined. This mechanism passes control to the BIOS to save and restore platform context. Context ownership is similar in definition to the S3 state, but hardware saves and restores the context of memory to non-volatile storage (such as a disk drive), and OSPM treats this as an S4 state with implied latency and power constraints. This alternate mechanism of entering the S4 state is referred to as the S4BIOS transition. 1. OSPM uses the RTC wakeup feature or the Time and Alarm Namespace device to program in the time transition delay. Prior to sleeping, OSPM will program the alarm to the closest (in time) wakeup event: either a transition to a lower power sleeping state, or a calendar event (to run some application). 2. Notice that there can be two fixed PM1x_CNT registers, each pointing to a different system I/O space region. Normally a register grouping only allows a bit or bit field to reside in a single register group instance (a or b); however, each platform can have two instances of the SLP_TYP (one for each grouping register: a and b). The \_Sx control method gives a package with two values: the first is the SLP_TYPa value and the second is the SLP_TYPb value. Version 6.0 691
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Advanced Configuration and Power In
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Revision History Revision Change De
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Contents 1 2 Introduction........
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5 ACPI Software Programming Model
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7 6.3.6 _RMV (Remove) ............
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9.2.5 _ALR (Ambient Light Response)
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11.2.1 Evaluating Thermal Device Li
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14.1.3 Generic Communications Subsp
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19.6.10 Buffer (Declare Buffer Obje
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19.6.102 Processor (Declare Process
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A.4.1 Power State Definitions......
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Tables Table 1-1 Hardware Type vs.
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Table 5-91 Power state Values .....
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Table 6-184 Device Insertion, Remov
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Table 10-275 Control Method Battery
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Table 19-367 Field Unit list entire
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Figures Figure 1-1 OSPM/ACPI Global
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Introduction 1 Introduction The Adv
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Introduction wake and answer the te
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Introduction Figure 1-1 OSPM/ACPI G
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Introduction specified below are ge
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Introduction ACPI System Descriptio
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Introduction • Support the ACPI E
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Introduction 1.9.2 Programming Mode
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Introduction 1.10 Related Documents
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Definition of Terms 2 Definition of
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Definition of Terms of power manage
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Definition of Terms I/O SAPIC An In
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Definition of Terms loaded. This al
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Definition of Terms varies on the w
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Definition of Terms in shallower po
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Definition of Terms state to allow
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ACPI Overview 3 ACPI Overview Platf
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ACPI Overview component to avoid da
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ACPI Overview Aspects of mobile PC
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ACPI Overview level, platform-speci
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ACPI Overview through their own bus
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ACPI Overview the SCI status bit ma
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ACPI Overview wait for the call. To
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ACPI Overview Each device enumerate
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ACPI Overview the battery is able t
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ACPI Overview Table 3-4 Level Warni
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ACPI Overview necessary. Figure 3-8
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ACPI Overview 3.11.1 Hardware-reduc
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ACPI Overview Low Power S0 Idle Cap
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ACPI Hardware Specification 4 ACPI
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ACPI Hardware Specification would b
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ACPI Hardware Specification OSPM re
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ACPI Hardware Specification SLP_ENx
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ACPI Hardware Specification Device
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ACPI Hardware Specification Generic
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ACPI Hardware Specification Feature
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ACPI Hardware Specification Registe
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ACPI Hardware Specification Table 4
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ACPI Hardware Specification purpose
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ACPI Software Programming Model 5 A
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Device Configuration 6 Device Confi
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Device Configuration BUS PCMCIA PC
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Device Configuration Device(SATA) /
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Device Configuration Return Value I
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Device Configuration unable to dete
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Device Configuration Name Definitio
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Device Configuration Name Definitio
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Device Configuration Rota-tion Goup
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Device Configuration Example ASL: N
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Device Configuration For example, i
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Device Configuration 6.2.5 _DSD (De
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Device Configuration } Name (_DSD,
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Device Configuration APIC Device”
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Device Configuration Scope(\_SB) {
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Device Configuration Method(_EJ0, 1
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Device Configuration Field Object T
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Device Configuration Field Object T
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Device Configuration other governin
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Device Configuration Since platform
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Device Configuration Section 8.4.4.
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Device Configuration Control Field
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Device Configuration Device(PCI0) /
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Device Configuration Field Type Des
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Device Configuration This optional
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Device Configuration Field Byte Len
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Device Configuration If a device in
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Device Configuration are present, w
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Device Configuration Arguments: Non
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Device Configuration Return Value:
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Device Configuration Table 6-187 Op
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Device Configuration User interacts
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Device Configuration Method(_EJ0, 1
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Device Configuration 6.4.2 Small Re
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Device Configuration Offset Field N
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Device Configuration Table 6-197 I/
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Device Configuration 6.4.2.9 End Ta
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Device Configuration Offset Byte 11
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Device Configuration To specify mul
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Device Configuration 6.5 Other Obje
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Device Configuration Note: The OS o
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Device Configuration whether the Gl
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Power and Performance Management 7
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Power and Performance Management No
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Power and Performance Management Re
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Power and Performance Management If
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Power and Performance Management ca
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Power and Performance Management
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Power and Performance Management im
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Power and Performance Management 9.
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Processor Configuration and Control
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Thermal Management 11 Thermal Manag
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Thermal Management When a thermal z
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Thermal Management controller firmw
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Thermal Management 11.1.5 Passive C
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Thermal Management 11.2 Cooling Pre
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Thermal Management Alternatively, d
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Thermal Management 11.3.1.2 _FPS (F
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Thermal Management 11.4.2 _ALx (Act
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Thermal Management Element Object T
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Thermal Management Return Value: No
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Thermal Management Other Temperatur
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Thermal Management // // NOTE3: Thi
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Thermal Management 11.4.16 _TFP (Th
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Thermal Management occurs—relievi
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Thermal Management Scope(\_SB) { De
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Thermal Management } // fan cooling
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Thermal Management // For brevity,
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Thermal Management External(\_SB.CP
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Thermal Management Method(_TPT, 1)
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ACPI Embedded Controller Interface
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ACPI Embedded Controller Interface
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Appendix A Device Class Specificati
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• PCI Bus Power Management Capabi
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A.4.1 Power State Definitions State
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A.5.1 Power State Definitions State
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power transitions and power managem
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A video controller conforming to th
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State Status Definition D2 N/A This
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The most common modem type is an IS
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State Status Definition D1 Optional
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A.11.1 Power State Definitions A.11
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A floppy disk and IDE channel devic
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GPE // ACPI General-purpose HW even
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the next boot, a 1 indicates a PCI
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Value 0x84 Description Previous Dis
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Bits Definition 31 0 - Don’t do a
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internal data structure of the OS t
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Symbols _EJx 334 ??????????????????
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Power Resource statements 391 prima
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centenary value, RTC alarm 83 Centr
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power resource objects 398 D2 Devic
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Eject Device List (_EDL) object 332
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features 68 functional implementati
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I/O resource flag 366 I/O SAPIC def
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logic fixed power button 77 lid swi
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objects _ BMC (Battery Maintenance
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transitioning working to soft-off s
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power resources battery management
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definition 22 table fields 115 RTC_
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protocols 650, 662, 669 Read/Write
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top of memory 704 ToString (Convert
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Advanced Configuration and Power Interface Specification

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