Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
COMRESET, Initial OS load, device insertion, HBA D3 to D0 transition,
asynchronous loss of signal:
1. OSPM sends IDENTIFY DEVICE or IDENTIFY PACKET DEVICE command to the attached
device.
2. OS executes _SDD. _SDD control method requires 1 argument that consists of the data block
received from an attached device as a result of a host issued IDENTIFY DEVICE or IDENTIFY
PACKET DEVICE command.
3. After the _SDD method completes, the OS executes the _GTF method. Using the task file
information provided by _GTF, the OS then sends the _GTF taskfiles to the attached device.
Device removal and HBA D0 to D3 transition:
1. No OSPM action required.
9.8.3.3.1 _SDD (Set Device Data)
This optional object is a control method that conveys to the platform the type of device connected to
the port. The _SDD object may exist under a SATA port device object. The platform typically uses
the information conveyed by the _SDD object to construct the values returned by the _GTF object.
OSPM conveys to the platform the ATA drive ID block, which is the raw data returned by the
Identify (Packet) Device, ATA command (command code “0ech.”). Please see the ATA/ATAPI-6
specification for more details.
Arguments: (1)
Arg0 – A Buffer containing an ATA drive identify block, contents described by the ATA
specification
Return Value:
None
9.9 Floppy Controller Device Objects
9.9.1 _FDE (Floppy Disk Enumerate)
Enumerating devices attached to a floppy disk controller is a time-consuming function. In order to
speed up the process of floppy enumeration, ACPI defines an optional enumeration object that is
defined directly under the device object for the floppy disk controller. It returns a buffer of five 32-
bit values. The first four values are Boolean values indicating the presence or absence of the four
floppy drives that are potentially attached to the controller. A non-zero value indicates that the
floppy device is present. The fifth value returned indicates the presence or absence of a tape
controller. Definitions of the tape presence value can be found in Table 9-259.
Arguments:
None
Return Value:
A Buffer containing a floppy drive information block, as decribed below
514 April, 2015 Version 6.0