Advanced Configuration and Power Interface Specification

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Advanced Configuration and Power Interface Specification mechanisms describe in Section 15, “System Address Map Interfaces.” If OSPM is booting from an S4 state, it will then check the NVS image file’s hardware signature with the hardware signature within the FACS table (built by BIOS) to determine whether it has changed since entering the sleeping state (indicating that the platforms fundamental hardware configuration has changed during the current sleeping state). If the signature has changed, OSPM will not restore the system context and can boot from scratch (from the S4 state). Next, for an S4 wake, OSPM will check the NVS file to see whether it is valid. If valid, then OSPM will load the NVS image into system memory. Next, if not a HW-reduced ACPI platform, OSPM will check the SCI_EN bit and if it is not set, will write the ACPI_ENABLE value to the SMI_CMD register to switch into the system into ACPI mode and will then reload the memory image from the NVS file. Boot OS Loader OS Waking Vector Get Memory Map (E820) * ACPI NVS * ACPI Reclaim * Reserved * System * Reserved NVS File ? No Yes Sanity Check Compare memory and volume SSN No Load OS Images Yes Memory Copy SCI_EN set? Yes No Turn on ACPI Execute _BFS Execute _WAK Continue Figure 16-80 OS Initialization 706 April, 2015 Version 6.0
Waking and Sleeping If an NVS image file did not exist, then OSPM loader will load OSPM from scratch. At this point, OSPM will generate a _WAK call that indicates to the BIOS that its ACPI NVS memory image has been successfully and completely updated. 16.3.4 Exiting ACPI Mode For machines that do not boot in ACPI mode, ACPI provides a mechanism that enables the OS to disable ACPI. The following occurs: 1. OSPM unloads all ACPI drivers (including the ACPI driver). 2. OSPM disables all ACPI events. 3. OSPM finishes using all ACPI registers. 4. OSPM issues an I/O access to the port at the address contained in the SMI_CMD field (in the FADT) with the value contained in the ACPI_DISABLE field (in the FADT). 5. BIOS then remaps all SCI events to legacy events and resets the SCI_EN bit. 6. Upon seeing the SCI_EN bit cleared, the ACPI OS enters the legacy OS mode. When and if the legacy OS returns control to the ACPI OS, if the legacy OS has not maintained the ACPI tables (in reserved memory and ACPI NVS memory), the ACPI OS will reboot the system to allow the BIOS to re-initialize the tables. Version 6.0 707
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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 Hardware Specification 4.8.2.2
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ACPI Hardware Specification Month A
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ACPI Software Programming Model 5 A
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ACPI Software Programming Model ACP
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ACPI Software Programming Model 5.2
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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 Object _FIX _G
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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: If the m
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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 Ob
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Power and Performance Management Ar
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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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Power Source and Power Meter Device
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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 Package (){ Revi
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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 11.4.20 _TSN (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 Source Language (ASL)Reference
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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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A.6.1.2 Internal Flat Panel Devices
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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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Appendix B Video Extensions B.1 ACP
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GPE // ACPI General-purpose HW even
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Pipe / Head Ports Display Types Dis
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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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