PEP_ACPI_QUERY_DEVICE_CONTROL_RESOURCES structure (pepfx.h)

The PEP_ACPI_QUERY_DEVICE_CONTROL_RESOURCES structure contains a list of raw resources that are needed to control power to the device.

Syntax

typedef struct _PEP_ACPI_QUERY_DEVICE_CONTROL_RESOURCES {
  [in]      PEPHANDLE            DeviceHandle;
  [in]      ULONG                RequestFlags;
  [out]     NTSTATUS             Status;
  [in, out] SIZE_T               BiosResourcesSize;
            ACPI_METHOD_ARGUMENT BiosResources[ANYSIZE_ARRAY];
} PEP_ACPI_QUERY_DEVICE_CONTROL_RESOURCES, *PPEP_ACPI_QUERY_DEVICE_CONTROL_RESOURCES;

Members

[in] DeviceHandle

A PEPHANDLE value that identifies the device's registration for ACPI services. The platform extension plug-in (PEP) supplied this handle in response to a previous PEP_NOTIFY_ACPI_REGISTER_DEVICE notification.

[in] RequestFlags

A set of input flags. No flags are currently defined for this member, which is always set to PEP_ACPI_QDCR_FLAG_NONE (0x0).

[out] Status

An NTSTATUS value that indicates the status of this query. Set this member to STATUS_SUCCESS if the PEP succeeded in providing the requested list of resources. Set to STATUS_BUFFER_TOO_SMALL to indicate that the output buffer is not large enough to contain the resource list.

[in, BiosResourcesSize

On input, the size, in bytes, of the buffer allocated for the BiosResources member. This buffer size includes any associated data that might follow this member.

If this buffer is not large enough to contain the ACPI_METHOD_ARGUMENT structure and its associated data, the PEP overwrites the input value of BiosResourcesSize with the required size and sets the Status member to STATUS_BUFFER_TOO_SMALL.

[in] BiosResources[ANYSIZE_ARRAY]

An output buffer to which the PEP writes an ACPI_METHOD_ARGUMENT structure that contains the requested resource list. The Data member of this structure is the first member in an array that might extend past the end of the structure. The buffer size specified by BiosResourcesSize includes both the ACPI_METHOD_ARGUMENT structure and any Data array elements that follow this structure.

Remarks

This structure is used by the PEP_NOTIFY_ACPI_QUERY_DEVICE_CONTROL_RESOURCES notification. The RequestFlags, BiosResourcesSize, and BiosResources members of the structure contain input values supplied by the Windows power management framework (PoFx) when this notification is sent. If the BiosResourcesSize input value is too small, the PEP should overwrite this value. The Status member contains an output value that the PEP writes to this structure in response to the notification.

If the input value specified in the BiosResourcesSize member is less than the required size, the PEP overwrites the BiosResourcesSize input value with the required size, and sets the Status member to STATUS_BUFFER_TOO_SMALL. In response, PoFx will try to allocate a buffer of the required size and send a second PEP_NOTIFY_ACPI_QUERY_DEVICE_CONTROL_RESOURCES notification to the PEP for this device.

Requirements

Requirement	Value
Minimum supported client	Supported starting with Windows 10.
Header	pepfx.h (include Pep_x.h)

See also

ACPI_METHOD_ARGUMENT

PEP_NOTIFY_ACPI_QUERY_DEVICE_CONTROL_RESOURCES

PEP_NOTIFY_ACPI_REGISTER_DEVICE