Advanced Configuration and Power Interface: Specification
1 Introduction
The Advanced Configuration and Power Interface (ACPI) specification was developed to establish industry common interfaces enabling robust operating system (OS)-directed motherboard device configuration and power management of both devices and entire systems. ACPI is the key element in OS-directed configuration and Power Management (OSPM).
ACPI evolves the existing collection of power management BIOS code, Advanced Power Management (APM) application programming interfaces (APIs, PNPBIOS APIs), Multiprocessor Specification (MPS) tables, and so on into a well-defined power management and configuration interface specification. ACPI provides the means for an orderly transition from existing (legacy) hardware to ACPI hardware, and it allows for both ACPI and legacy mechanisms to exist in a single machine and to be used as needed.
Further, new system architectures are being built that stretch the limits of current Plug and Play interfaces. ACPI evolves the existing motherboard configuration interfaces to support these advanced architectures in a more robust, and potentially more efficient manner.
The interfaces and OSPM concepts defined within this specification are suitable to all classes of computers including (but not limited to) desktop, mobile, workstation, and server machines. From a power management perspective, OSPM/ACPI promotes the concept that systems should conserve energy by transitioning unused devices into lower power states including placing the entire system in a low-power state (sleeping state) when possible.
This document describes ACPI hardware interfaces, ACPI software interfaces, and ACPI data structures that, when implemented, enable support for robust OSPM.
Read the full Advanced Configuration and Power Interface Specification.
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Advanced Configuration and Power Interface: Specification
1 Introduction
The Advanced Configuration and Power Interface (ACPI) specification was developed to establish industry common interfaces enabling robust operating system (OS)-directed motherboard device configuration and power management of both devices and entire systems. ACPI is the key element in OS-directed configuration and Power Management (OSPM).
ACPI evolves the existing collection of power management BIOS code, Advanced Power Management (APM) application programming interfaces (APIs, PNPBIOS APIs), Multiprocessor Specification (MPS) tables, and so on into a well-defined power management and configuration interface specification. ACPI provides the means for an orderly transition from existing (legacy) hardware to ACPI hardware, and it allows for both ACPI and legacy mechanisms to exist in a single machine and to be used as needed.
Further, new system architectures are being built that stretch the limits of current Plug and Play interfaces. ACPI evolves the existing motherboard configuration interfaces to support these advanced architectures in a more robust, and potentially more efficient manner.
The interfaces and OSPM concepts defined within this specification are suitable to all classes of computers including (but not limited to) desktop, mobile, workstation, and server machines. From a power management perspective, OSPM/ACPI promotes the concept that systems should conserve energy by transitioning unused devices into lower power states including placing the entire system in a low-power state (sleeping state) when possible.
This document describes ACPI hardware interfaces, ACPI software interfaces, and ACPI data structures that, when implemented, enable support for robust OSPM.
Read the full Advanced Configuration and Power Interface Specification.
