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ACPI Desktop Concept Machine
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ACPI Desktop Concept Machine

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 Operating Systemdirected 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 OS-directed configuration and power management (OSPM).

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 Operating Systemdirected configuration and Power Management (OSPM). ACPI evolved the existing pre-ACPI 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, system architectures being built at the time of the original ACPI specification’s inception, stretched the limits of historical “Plug and Play” interfaces. ACPI evolved existing motherboard configuration interfaces to support 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 OS-directed configuration and power management (OSPM).

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 Operating System-directed configuration and Power Management (OSPM). ACPI evolved the existing pre-ACPI 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, system architectures being built at the time of the original ACPI specification’s inception, stretched the limits of historical “Plug and Play” interfaces. ACPI evolved existing motherboard configuration interfaces to support 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 OS-directed configuration and power management (OSPM)

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