To enhance the functionality of an ACPI device, the vendor can supply a WDM function driver, which communicates with the ACPI BIOS through an operation region supplied by the driver. A device's definition block specifies, among other things, an operation region, which specifies a contiguous block of device memory that is used to access device data. An ACPI device is specified by a definition block in the ACPI System Description Tables.

The combined operation of the system-supplied ACPI driver and the ACPI BIOS supports the basic functionality of ACPI devices and is transparent to the rest of the operating system. An ACPI namespace is a hierarchical namespace that an ACPI BIOS uses to reference objects. This section describes how a vendor can use a WDM function driver in Windows to enhance the functionality of an Advanced Configuration and Power Interface (ACPI) device.ĪCPI devices include low-level system devices such as batteries, thermal zones, and other devices defined in a system's ACPI namespace.

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