Advanced Configuration and Power Interface Specification

Device Configuration
6.5 Other Objects and Control Methods
Table 6-223 Other Objects and Methods
Object
_INI
_DCK
_BDN
_REG
_BBN
_SEG
_GLK
_FIT
Description
Device initialization method that is run shortly after ACPI has been enabled.
Indicates that the device is a docking station.
Correlates a docking station between ACPI and legacy interfaces.
Notifies AML code of a change in the availability of an operation region.
PCI bus number set up by the BIOS.
Indicates a bus segment location.
Indicates the Global Lock must be acquired when accessing a device.
Evaluates to a buffer returning data in the format of a series of NFIT Type Structure Entries.
6.5.1 _INI (Init)
_INI is a device initialization object that performs device specific initialization. This control method
is located under a device object and is run only when OSPM loads a description table. There are
restrictions related to when this method is called and governing writing code for this method. The
_INI method must only access Operation Regions that have been indicated to available as defined by
the _REG method. The _REG method is described in Section 6.5.4, “_REG (Region).” This control
method is run before _ADR, _CID, _HID, _SUN, and _UID are run.
Arguments:
None
Return Value:
None
Before evaluating the _INI object, OSPM evaluates the _STA object for the device. If the _STA
object does not exist for the device, the device is assumed to be both present and functional. If the
_STA method indicates that the device is present, OSPM will evaluate the _INI for the device (if the
_INI method exists) and will examine each of the children of the device for _INI methods. If the
_STA method indicates that the device is not present and is not functional, OSPM will not run the
_INI and will not examine the children of the device for _INI methods. If the _STA object
evaluation indicates that the device is not present but is functional, OSPM will not evaluate the _INI
object, but will examine each of the children of the device for _INI objects (see the description of
_STA for the explanation of this special case.) If the device becomes present after the table has
already been loaded, OSPM will not evaluate the _INI method, nor examine the children for _INI
methods.
The OSPM performed _INI object actions based upon the _STA Present and Functional bits are
summarized in the table below.
Table 6-224 OSPM _INI Object Actions
_STA Present Bit _STA Functional Bit Actions
0 0 Do not run _INI, do not examine device children
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