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Windows VXD and IRQ Handling

Posted on 1997-05-17
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Last Modified: 2013-12-03
I need the esqueleton of a Windows VxD. I also need to trap any IRQ (IRQ 7) and read from I/O 300h when IRQ occurs. I 'm programing in Delphi now but the code can be in C++ or any other languaje.
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Question by:i9423342
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amartin030297 earned 200 total points
ID: 1397423
First of all-- I assume you have the DDK (or VToolsD [www.vireo.com]) so you can build VxD's..


VPICD_HWInt_THUNK fakeInt_Thunk;            // Thunk for interrupt handler
VPICD_VirtInt_THUNK fakeVMThunk;
VPICD_MaskChange_THUNK fakeVMMaskThunk;
void __stdcall fakeVMMask(VMHANDLE hVM, IRQHANDLE hIRQ, int isBeingMasked);
BOOL __stdcall fake_HWInt_HANDLER(VMHANDLE hVM, IRQHANDLE hIRQ);

void releaseIRQVirtualization(unsigned long irq)
{
    irq &= 0xf;
    if (hIRQ[irq])
    {
        dprintf("VxD Releasing Virtual IRQ: %d (0x%x)", irq,irq);
        VPICD_Force_Default_Behavior(hIRQ[irq]);
        hIRQ[irq]=NULL;
    }
}

void __stdcall fakeVMMask(VMHANDLE hVM, IRQHANDLE hIRQ, int isBeingMasked)
{
    VPICD_Clear_Int_Request(hVM, hIRQ);
    VPICD_Virtual_EOI(hIRQ, hVM);

    if (isBeingMasked)
    {
       
    }
    return;
}


BOOL __stdcall fake_HWInt_HANDLER(VMHANDLE hVM, IRQHANDLE hIRQ)
{
    ;...do  your phys_eoi here... I left this part out
    return TRUE;
}


BOOL requestIRQVirtualization(unsigned long irq)
{
    irq &= 0xf;
    if (hIRQ[irq])
    {
        return TRUE;
    }
    VPICD_IRQ_Descriptor vps;
    memset(&vps,0,sizeof (VPICD_IRQ_Descriptor));
    vps.VID_IRQ_Number=irq;
    vps.VID_IRET_Time_Out=0;//1000;
    vps.VID_Options=VPICD_OPT_CAN_SHARE;
    vps.VID_Hw_Int_Proc=(DWORD)VPICD_Thunk_HWInt(fake_HWInt_HANDLER, &fakeInt_Thunk);
    vps.VID_Mask_Change_Proc=(DWORD)VPICD_Thunk_MaskChange(fakeVMMask, &fakeVMMaskThunk);
    hIRQ[irq]=VPICD_Virtualize_IRQ(&vps);
    if (!hIRQ[irq])
    {
        return FALSE;
    }
    return TRUE;
}

Let me know if you need more help...

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