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ACPI OverviewACPI Overview

MOUNIKA.KETANAMOUNIKA.KETANA

14481D551714481D5517

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ContentsContents

Power Management HistoryPower Management History ACPIACPI ACPI States and Software ACPI States and Software

ComponentsComponents ACPI HistoryACPI History Changing ACPIChanging ACPI

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Power Management HistoryPower Management History

Advanced Power Management (APM)Advanced Power Management (APM) BIOS-based system power managementBIOS-based system power management Provides CPU and device power managementProvides CPU and device power management Called when idle - provides CPU power mgt.Called when idle - provides CPU power mgt. Uses device activity timeouts to determine Uses device activity timeouts to determine

when to transition devices into low power when to transition devices into low power statesstates

OS has no knowledge of what APM doesOS has no knowledge of what APM does Each IBV must refine and maintain APM BIOS Each IBV must refine and maintain APM BIOS

code/IPcode/IP Wide variety of implementations and Wide variety of implementations and

functionality functionality No uniform user experienceNo uniform user experience

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ACPIACPI

Advanced Configuration and Power InterfaceAdvanced Configuration and Power Interface Conceived by Intel, Microsoft, and Toshiba (the Conceived by Intel, Microsoft, and Toshiba (the

promoters)promoters)

An “interface” specificationAn “interface” specification ACPI/OSPM replaces APM, MPS, and PnP BIOS SpecACPI/OSPM replaces APM, MPS, and PnP BIOS Spec

Allow OS-directed Power Management Allow OS-directed Power Management (OSPM)(OSPM)

Defines Defines Hardware registers - implemented in chipset siliconHardware registers - implemented in chipset silicon BIOS interfacesBIOS interfaces

Configuration tablesConfiguration tables Interpreted executable function interface (Control Methods)Interpreted executable function interface (Control Methods) Motherboard device enumeration and configurationMotherboard device enumeration and configuration

System and device power statesSystem and device power states ACPI Thermal ModelACPI Thermal Model

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ACPI Global States and ACPI Global States and TransitionsTransitions

S4BIOS_FS4BIOS_REQ

ACPI_DISABLE(SCI_EN=0)

G3 -MechOff

LegacyBoot

(SCI_EN=0)

LegacyBoot

(SCI_EN=0)

ACPI_ENABLE(SCI_EN=1)

Legacy

SLP_TYPx=S5

andSLP_EN

orPWRBTN_OR

WakeEvent

C0

G0 (S0) -Working

G1 -Sleeping

S4S3

S2S1

PowerFailure

ACPIBoot

(SCI_EN=1)

ACPIBoot

(SCI_EN=1)

G2 (S5) -Soft Off

SLP_TYPx=(S1-S4)and

SLP_EN

D0D1

D2D3

Modem

D0

D1D2

D3HDD

D0

D1D2

D3CDROM

C1C2

C3CPU

C0

BIOSRoutine

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An ACPI SystemAn ACPI System

Operating System

PolicyManager

DeviceDrivers

ACPISubsystem

ACPI-Related

Hardware /ACPI BIOS

User Interface

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ACPI Software ComponentsACPI Software Components

ACPI SubsystemACPI Subsystem Consumes ACPI BIOSConsumes ACPI BIOS Interacts with ACPI HardwareInteracts with ACPI Hardware

Policy Manager (OSPM)Policy Manager (OSPM) Sets and Monitors System PoliciesSets and Monitors System Policies User InterfaceUser Interface

Allows User Input to PolicyAllows User Input to Policy

Device DriversDevice Drivers EC, SM Bus, CM Battery, Smart BatteryEC, SM Bus, CM Battery, Smart Battery

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ACPI System OverviewACPI System Overview

AC PI T ab lesAC PI B IO SAC PI R eg isters

K ernel

D eviceD river

ACPIRegisterInterface

ACPI TableInterface

ACPI BIOSInterface

Platform H ardw are

Existingindustrystandardregister

interfaces to:CMOS, PIC,

PIT s, ...

AC PI D river/AM L Interpreter

ApplicationsO S

D ependentA pplication

A PIs

O S Specifictechnolog ies,

in terfaces, and code.

OSIndependenttechnologies,

interfaces,code, andhardware.

BIOS

O SPM System Code

- Hardware/Platform- Provided by ACPI CA

- ACPI Spec Covers this area.- O S specific technology

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ACPI Specification HistoryACPI Specification History

ACPI 1.0 released December 1996ACPI 1.0 released December 1996

ACPI 1.0a released July 1998ACPI 1.0a released July 1998

ACPI 1.0b released February 1999ACPI 1.0b released February 1999

ACPI 2.0 released July 2000ACPI 2.0 released July 2000

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How does ACPI change?How does ACPI change?

Periodic errata meetings held with Periodic errata meetings held with promoterspromoters

Either spec is updated (e.g. 1.0a, 1.0B, etc) Either spec is updated (e.g. 1.0a, 1.0B, etc) or an errata document is posted on the or an errata document is posted on the ACPI site: http://www.acpi.infoACPI site: http://www.acpi.info