TOP Acpi Pnp0700 Driver 12

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Secondly, I would like to ask if internal floppy disk drives require any software drivers to work as I am unsure if the device ID above are referring to a physical peripheral or a software driver (i.e. Bluetooth drivers do have device IDs too).


PS: I have tried googling but the most I could find is that Win10 PC could download floppy drivers to use internal floppy drives, but it did not answer what is the device ID it would generate (i.e. Is the format similar to how an actual internal floppy drive is or does it adopt a different naming convention?)


The Windows ACPI driver, Acpi.sys, is an inbox component of the Windows operating system. The responsibilities of Acpi.sys include support for power management and Plug and Play (PnP) device enumeration. On hardware platforms that have an ACPI BIOS, the HAL causes Acpi.sys to be loaded during system startup at the base of the device tree. Acpi.sys acts as the interface between the operating system and the ACPI BIOS. Acpi.sys is transparent to the other drivers in the device tree.


For each device described in the ACPI namespace hierarchy, the Windows ACPI driver, Acpi.sys, creates either a filter device object (filter DO) or a physical device object (PDO). If the device is integrated into the system board, Acpi.sys creates a filter device object, representing an ACPI bus filter, and attaches it to the device stack immediately above the bus driver (PDO). For other devices described in the ACPI namespace but not on the system board, Acpi.sys creates the PDO. Acpi.sys provides power management and PnP features to the device stack with these device objects. For more information, see Device stacks for an ACPI device.


Acpi.sys and the ACPI BIOS support the basic functions of an ACPI device. To enhance the functionality of an ACPI device, the device vendor can supply a WDM function driver. For more information, see Operation of an ACPI device function driver.





An ACPI device is specified by a definition block in the system description tables in the ACPI BIOS. A device's definition block specifies, among other things, an operation region, which is a contiguous block of device memory that is used to access device data. Only Acpi.sys modifies the data in an operation region. The device's function driver can read the data in an operation region but must not modify the data. When called, an operation region handler transfers bytes in the operation region to and from the data buffer in Acpi.sys. The combined operation of the function driver and Acpi.sys is device-specific and is defined in the ACPI BIOS by the hardware vendor. In general, the function driver and Acpi.sys access particular areas in an operation region to perform device-specific operations and retrieve information. For more information, see Supporting an operation region.


ACPI control methods are software objects that declare and define simple operations to query and configure ACPI devices. Control methods are stored in the ACPI BIOS and are encoded in a byte-code format called ACPI machine language (AML). The control methods for a device are loaded from the system firmware into the device's ACPI namespace in memory, and interpreted by the Windows ACPI driver, Acpi.sys.


To invoke a control method, the kernel-mode driver for an ACPI device initiates an 
IRP_MJ_DEVICE_CONTROL
 request, which is handled by Acpi.sys. For drivers loaded on ACPI-enumerated devices, Acpi.sys always implements the physical device object (PDO) in the driver stack. For more information, see Evaluating ACPI control methods.


Revision 5.0 of the ACPI specification introduces a set of features to support low-power, mobile PCs that are based on System on Chip (SoC) integrated circuits and that implement the connected standby power model. Starting with Windows 8 and later versions, the Windows ACPI driver, Acpi.sys,

TOP Acpi Pnp0700 Driver 12

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