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Acpi sys windows 10

 

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. ACPI defines a generic, extensible table-passing mechanism, plus specific tables for describing the platform to the operating system. Windows utilizes this table-passing mechanism, in addition to the specific tables that are described in this article. The idea behind these tables is to enable generic software to support standard intellectual property IP blocks that can be integrated into various platforms in diverse ways.

With the table strategy, the platform-variable attributes of a particular platform are provided in a table, and used by generic software to adapt itself to the specific set of IP blocks integrated into the platform. This software can therefore be written once, thoroughly tested, and then optimized over time. Windows depends on UEFI firmware to boot up the hardware platform.

Specifically, this table contains pointers to the following:. Indicates that ACPI hardware is not available on this platform. Indicates that the platform supports low-power idle states within the ACPI S0 system power state that are more energy efficient than any Sx sleep state. If this flag is set, Windows will not try to sleep and resume, but will instead use platform idle states and connected standby. This role influences power management policy for the display and input, and affects the display of on-screen keyboards.

These fields are ignored by Windows, but must be present in the table for compliance. For more information, see section 5. For more information about these descriptors, see sections 5.

The interrupt controller descriptor structures are listed immediately after the Flags field in the MADT. The GIC corresponding to the boot processor must be the first entry in the list of interrupt controller descriptors. As with the interrupt controller, there is a standard timer description table in ACPI. Core System Resources CSRs are shared hardware functions such as interrupt controllers, timers and DMA controllers to which the operating system must serialize access.

However, until the industry converges on DMA controller interface standards, there is a need to support some non-standard devices in the operating system. Windows supports the concept of HAL extensions to address this issue. Windows uses the identifier provided for the resource group to find and load the required HAL extension for this group.

The format and use of these resource descriptors is defined by the HAL extension writer, who can make the extension much more portable and thereby support a variety of different SoC platforms simply by changing the resource descriptors contained in the CSRT. To support maintenance of HAL extensions, and to manage the system resources used by these extensions, each resource group described in the CSRT must also be represented as a device within the platform's ACPI namespace.

The device identifiers used in the resource group header must match the identifiers used in the device's namespace node. The existence of these resource group namespace devices allows the HAL extension to be serviced by the Windows Update Service. Microsoft requires a debug port on all systems. This table specifies one or more independent port s for debugging purposes. The presence of the DBG2 table indicates that the platform includes at least one debug port.

This table includes information about the identity and configuration of the debug port s. Other information in the DBG2 table specifies the system address of the port registers, which is used by the hardware interface module for the specified subtype.

This reference enables Windows to manage conflicts between debugging use and normal use of the device, if any, and also to integrate the debugger with power transitions.

An AML object might simply return description information. ASL uses OpRegions to abstract the various address spaces accessible in the operating system. For more information about OpRegions, see section 5. For more about ASL and control methods, see section 5. Windows provides support for developing and debugging ASL code. The ASL compiler includes a disassembler to enable the implementer to load a namespace from a debugging target. The ASL compiler can then be used to reapply the namespace to the target for rapid prototyping and testing—without having to flash the system firmware.

The iBFT is available to the Windows operating system to enable a consistent flow of the boot process. Skip to main content.

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