reactos/ntoskrnl/io/pnpdma.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/io/pnpdma.c
   6  * PURPOSE:         PnP manager DMA routines
   7  *
   8  * PROGRAMMERS:     Filip Navara (xnavara@volny.cz)
   9  */
  10
  11 /* INCLUDES ******************************************************************/
  12
  13 #include <ntoskrnl.h>
  14 #define NDEBUG
  15 #include <internal/debug.h>
  16 #include <wdmguid.h>
  17
  18 /* FUNCTIONS *****************************************************************/
  19
  20 /*
  21  * @implemented
  22  */
  23 PDMA_ADAPTER STDCALL
  24 IoGetDmaAdapter(
  25   IN PDEVICE_OBJECT PhysicalDeviceObject,
  26   IN PDEVICE_DESCRIPTION DeviceDescription,
  27   IN OUT PULONG NumberOfMapRegisters)
  28 {
  29   NTSTATUS Status;
  30   ULONG ResultLength;
  31   BUS_INTERFACE_STANDARD BusInterface;
  32   IO_STATUS_BLOCK IoStatusBlock;
  33   IO_STACK_LOCATION Stack;
  34   DEVICE_DESCRIPTION PrivateDeviceDescription;
  35   PDMA_ADAPTER Adapter = NULL;
  36
  37   DPRINT("IoGetDmaAdapter called\n");
  38
  39   /*
  40    * Try to create DMA adapter through bus driver.
  41    */
  42
  43   if (PhysicalDeviceObject != NULL)
  44   {
  45     if (DeviceDescription->InterfaceType == PNPBus ||
  46         DeviceDescription->InterfaceType == InterfaceTypeUndefined)
  47     {
  48       RtlCopyMemory(&PrivateDeviceDescription, DeviceDescription,
  49         sizeof(DEVICE_DESCRIPTION));
  50       Status = IoGetDeviceProperty(PhysicalDeviceObject,
  51          DevicePropertyLegacyBusType, sizeof(INTERFACE_TYPE),
  52          &PrivateDeviceDescription.InterfaceType, &ResultLength);
  53       if (!NT_SUCCESS(Status))
  54         PrivateDeviceDescription.InterfaceType = Internal;
  55       DeviceDescription = &PrivateDeviceDescription;
  56     }
  57
  58     Stack.Parameters.QueryInterface.Size = sizeof(BUS_INTERFACE_STANDARD);
  59     Stack.Parameters.QueryInterface.Version = 1;
  60     Stack.Parameters.QueryInterface.Interface = (PINTERFACE)&BusInterface;
  61     Stack.Parameters.QueryInterface.InterfaceType =
  62       &GUID_BUS_INTERFACE_STANDARD;
  63     Status = IopInitiatePnpIrp(PhysicalDeviceObject, &IoStatusBlock,
  64       IRP_MN_QUERY_INTERFACE, &Stack);
  65     if (NT_SUCCESS(Status))
  66     {
  67       Adapter = BusInterface.GetDmaAdapter(BusInterface.Context,
  68         DeviceDescription, NumberOfMapRegisters);
  69       BusInterface.InterfaceDereference(BusInterface.Context);
  70       if (Adapter != NULL)
  71         return Adapter;
  72     }
  73   }
  74
  75   /*
  76    * Fallback to HAL.
  77    */
  78
  79   return HalGetDmaAdapter(PhysicalDeviceObject, DeviceDescription,
  80                           NumberOfMapRegisters);
  81 }
  82
  83 /* EOF */