Microsoft KB Archive/152541

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DOCERR: Passing Reference Data to a Hardware Interrupt Handler

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Q152541

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The information in this article applies to:


 * Microsoft Win32 Device Driver Kit (DDK) Windows 95

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SUMMARY
The Windows 95 DDK documentation for the VPICD_IRQ_Descriptor structure lists an element called VID_Hw_Int_Ref that is used for reference data that the system passes to the hardware interrupt handler. The documentation also states that the VID_Options bit VPICD_OPT_Ref_Data must be set in order for the data to be passed to the handler.

The documentation does not mention how the hardware interrupt handler accesses this reference data. When the handler is called, the edx register will point to the reference data.