ntoskrnl/io/pnpmgr/pnpdma.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * COPYRIGHT:       GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/io/pnpmgr/pnpdma.c
   5  * PURPOSE:         PnP manager DMA routines
   6  * PROGRAMMERS:     Filip Navara (xnavara@volny.cz)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14 #include <wdmguid.h>
  15
  16 /* PUBLIC FUNCTIONS **********************************************************/
  17
  18 /*
  19  * @implemented
  20  */
  21 PDMA_ADAPTER
  22 NTAPI
  23 IoGetDmaAdapter(IN PDEVICE_OBJECT PhysicalDeviceObject,
  24                 IN PDEVICE_DESCRIPTION DeviceDescription,
  25                 IN OUT PULONG NumberOfMapRegisters)
  26 {
  27     NTSTATUS Status;
  28     ULONG ResultLength;
  29     BUS_INTERFACE_STANDARD BusInterface;
  30     IO_STATUS_BLOCK IoStatusBlock;
  31     IO_STACK_LOCATION Stack;
  32     DEVICE_DESCRIPTION PrivateDeviceDescription;
  33     PDMA_ADAPTER Adapter = NULL;
  34
  35     DPRINT("IoGetDmaAdapter called\n");
  36
  37
  38     /* Try to create DMA adapter through bus driver */
  39     if (PhysicalDeviceObject)
  40     {
  41         if (DeviceDescription->InterfaceType == PNPBus ||
  42             DeviceDescription->InterfaceType == InterfaceTypeUndefined)
  43         {
  44             RtlCopyMemory(&PrivateDeviceDescription,
  45                           DeviceDescription,
  46                           sizeof(DEVICE_DESCRIPTION));
  47
  48             Status = IoGetDeviceProperty(PhysicalDeviceObject,
  49                                          DevicePropertyLegacyBusType,
  50                                          sizeof(INTERFACE_TYPE),
  51                                          &PrivateDeviceDescription.InterfaceType,
  52                                          &ResultLength);
  53
  54             if (!NT_SUCCESS(Status))
  55                 PrivateDeviceDescription.InterfaceType = Internal;
  56
  57             DeviceDescription = &PrivateDeviceDescription;
  58         }
  59
  60         Stack.Parameters.QueryInterface.Size = sizeof(BUS_INTERFACE_STANDARD);
  61         Stack.Parameters.QueryInterface.Version = 1;
  62         Stack.Parameters.QueryInterface.Interface = (PINTERFACE)&BusInterface;
  63         Stack.Parameters.QueryInterface.InterfaceType =
  64             &GUID_BUS_INTERFACE_STANDARD;
  65
  66         Status = IopInitiatePnpIrp(PhysicalDeviceObject,
  67                                    &IoStatusBlock,
  68                                    IRP_MN_QUERY_INTERFACE,
  69                                    &Stack);
  70
  71         if (NT_SUCCESS(Status))
  72         {
  73             Adapter = BusInterface.GetDmaAdapter(BusInterface.Context,
  74                                                  DeviceDescription,
  75                                                  NumberOfMapRegisters);
  76
  77             BusInterface.InterfaceDereference(BusInterface.Context);
  78             if (Adapter) return Adapter;
  79         }
  80     }
  81
  82     /* Fall back to HAL */
  83     return HalGetDmaAdapter(PhysicalDeviceObject,
  84                             DeviceDescription,
  85                             NumberOfMapRegisters);
  86 }