HW_INITIALIZE callback function (storport.h)

The HwStorInitialize routine initializes the miniport driver after a system reboot or power failure occurs. It is called by StorPort after HwStorFindAdapter successfully returns. HwStorInitialize initializes the HBA and finds all devices that are of interest to the miniport driver.



BOOLEAN HwInitialize(
  PVOID DeviceExtension



A pointer to the miniport driver's per HBA storage area.

Return value

If the initialization succeeds, HwStorInitialize returns TRUE.


The name HwStorInitialize is just a placeholder. The actual prototype of this routine is defined in Storport.h as follows:

  _In_ PVOID  DeviceExtension

Because HwStorInitialize is called at DIRQL, as much of the initialization process as possible should be performed by HwStorPassiveInitializeRoutine. If so, you must enable the passive initialization routine via StorPortEnablePassiveInitialization.

If interrupts are generated by the hardware initialization, the HwStorInterrupt routine will be called. In this case, the HwStorInitialize routine should set up any data that HwStorInterrupt expects (including a HwStorDpcRoutine, if one is used) before it begins to initialize the hardware.

The following responsibilities are shared between HwStorInitialize and HwStorPassiveInitializeRoutine:

  • Initialize hardware for the HBA registers and buffers.

  • Initialize and allocate all DeviceExtension fields.

  • Set up and initialize all events and DPCs that are used by the miniport driver.


To define an HwStorInitialize callback function, you must first provide a function declaration that identifies the type of callback function you’re defining. Windows provides a set of callback function types for drivers. Declaring a function using the callback function types helps Code Analysis for Drivers, Static Driver Verifier (SDV), and other verification tools find errors, and it’s a requirement for writing drivers for the Windows operating system.

For example, to define a HwStorInitialize callback routine that is named MyHwInitialize, use the HW_INITIALIZE type as shown in this code example:


Then, implement your callback routine as follows:

  MyHwInitialize( _In_ PVOID DeviceExtension )

The HW_INITIALIZE function type is defined in the Storport.h header file. To more accurately identify errors when you run the code analysis tools, be sure to add the Use_decl_annotations annotation to your function definition. The Use_decl_annotations annotation ensures that the annotations that are applied to the HW_INITIALIZE function type in the header file are used. For more information about the requirements for function declarations, see Declaring Functions Using Function Role Types for Storport Drivers. For information about Use_decl_annotations, see Annotating Function Behavior.


Target Platform Universal
Header storport.h (include Storport.h)
IRQL DIRQL (See Remarks section.)

See also