CreateDMA

SoundProgramDMA

static IO_ALLOCATION_ACTION NTAPI SoundProgramDMA	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp,
		IN PVOID	MapRegisterBase,
		IN PVOID	Context
	)		`[static]`

Definition at line 37 of file dma.c.

Referenced by CreateDMA().

{
    PDEVICE_EXTENSION Device = DeviceObject->DeviceExtension;
    ULONG zzz;
    PUCHAR VirtualAddress = (PUCHAR) MmGetMdlVirtualAddress(Device->Mdl);

    DPRINT("IoMapTransfer\n");
    IoMapTransfer(Device->Adapter,
                    Device->Mdl,
                    MapRegisterBase,
                    (PUCHAR) MmGetMdlVirtualAddress(Device->Mdl),
                    &Device->BufferSize,    // is this right?
                    TRUE);

    DPRINT("VBuffer == 0x%x (really 0x%x?) Bufsize == %u\n", Device->VirtualBuffer, MmGetPhysicalAddress(Device->VirtualBuffer), Device->BufferSize);

    DPRINT("Writing %u bytes of garbage...\n", Device->BufferSize);
    // Write some garbage:
    for (zzz = 0; zzz < Device->BufferSize; zzz ++)
        *(VirtualAddress + zzz) = (UCHAR) zzz % 200;

    DPRINT("done\n");

    KeSetEvent(Context, 0, FALSE);

    return KeepObject;
}

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