// ntddk.h

typedef enum _BDCB_CALLBACK_TYPE {
  BdCbStatusUpdate,
  BdCbInitializeImage
} BDCB_CALLBACK_TYPE, *PBDCB_CALLBACK_TYPE;
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Windows Driver Kit DDI reference (ne-ntddk-_bdcb_callback_type)

Description

The BDCB_CALLBACK_TYPE enumeration specifies whether the callback being passed to a BOOT_DRIVER_CALLBACK_FUNCTION routine is a status update or a boot-start driver initialization notification.

Constants

`BdCbStatusUpdate`

A status update provided by the system to a boot-start driver.

`BdCbInitializeImage`

A boot image is about to be initialized. During this callback, boot-start drivers may classify a boot image as a known good image or a known bad image.

Remarks

The two callback types have unique context structures that provide additional information specific to the callback.

Value	Corresponding structure to use
BdCbStatusUpdate	BDCB_STATUS_UPDATE_TYPE
BdCbInitializeImage	BDCB_CLASSIFICATION

BDCB_CALLBACK_TYPE - NtDoc