Advanced Configuration and Power Interface Specification

Device Configuration
6
Device Configuration
This section specifies the objects OSPM uses to configure devices. There are three types of
configuration objects:
Device identification objects associate platform devices with Plug and Play IDs.
• Device configuration objects declare and configure hardware resources and characteristics for
devices enumerated via ACPI.
• Device insertion and removal objects provide mechanisms for handling dynamic insertion and
removal of devices.
This section also defines the ACPI device–resource descriptor formats. Device–resource descriptors
are used as parameters by some of the device configuration objects.
6.1 Device Identification Objects
Device identification objects associate each platform device with a Plug and Play device ID for each
device. All the device identification objects are listed in the table below:
Table 6-167 Device Identification Objects
Object
_ADR
_CCA
_CID
_CLS
_DDN
_HID
_HRV
_MLS
_PLD
_PRD
_SUB
_SUN
_STR
_UID
Description
Object that evaluates to a device’s address on its parent bus.
Cache Coherency Attribute -- specifies whether a device and its descendants support hardware
managed cache coherency.
Object that evaluates to a device’s Plug and Play-compatible ID list.
Object that evaluates to a package of coded device-class information.
Object that associates a logical software name (for example, COM1) with a device.
Object that evaluates to a device’s Plug and Play hardware ID.
Object that evaluates to an integer hardware revision number.
Object that provides a human readable description of a device in multiple languages.
Object that provides physical location description information.
Object that evaluates to a package of device property subpackages.
Object that evaluates to a device's Plug and Play subsystem ID.
Object that evaluates to the slot-unique ID number for a slot.
Object that contains a Unicode identifier for a device.
Object that specifies a device’s unique persistent ID, or a control method that generates it.
For any device that is on a non-enumerable type of bus (for example, an ISA bus), OSPM
enumerates the devices' identifier(s) and the ACPI system firmware must supply an _HID object
(plus one or more optional objects such as _CID, _CLS, _HRV, _SUB) for each device to enable
OSPM to do that. For devices on an enumerable type of bus, such as a PCI bus, the ACPI system
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