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83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/io/pnpdma.c
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* PURPOSE: PnP manager DMA routines
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*
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* PROGRAMMERS: Filip Navara (xnavara@volny.cz)
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <internal/debug.h>
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#include <wdmguid.h>
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/* FUNCTIONS *****************************************************************/
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/*
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* @implemented
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*/
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PDMA_ADAPTER STDCALL
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IoGetDmaAdapter(
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IN PDEVICE_OBJECT PhysicalDeviceObject,
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IN PDEVICE_DESCRIPTION DeviceDescription,
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IN OUT PULONG NumberOfMapRegisters)
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{
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NTSTATUS Status;
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ULONG ResultLength;
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BUS_INTERFACE_STANDARD BusInterface;
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IO_STATUS_BLOCK IoStatusBlock;
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IO_STACK_LOCATION Stack;
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DEVICE_DESCRIPTION PrivateDeviceDescription;
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PDMA_ADAPTER Adapter = NULL;
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DPRINT("IoGetDmaAdapter called\n");
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/*
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* Try to create DMA adapter through bus driver.
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*/
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if (PhysicalDeviceObject != NULL)
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{
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if (DeviceDescription->InterfaceType == PNPBus ||
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DeviceDescription->InterfaceType == InterfaceTypeUndefined)
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{
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RtlCopyMemory(&PrivateDeviceDescription, DeviceDescription,
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sizeof(DEVICE_DESCRIPTION));
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Status = IoGetDeviceProperty(PhysicalDeviceObject,
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DevicePropertyLegacyBusType, sizeof(INTERFACE_TYPE),
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&PrivateDeviceDescription.InterfaceType, &ResultLength);
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if (!NT_SUCCESS(Status))
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PrivateDeviceDescription.InterfaceType = Internal;
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DeviceDescription = &PrivateDeviceDescription;
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}
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Stack.Parameters.QueryInterface.Size = sizeof(BUS_INTERFACE_STANDARD);
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Stack.Parameters.QueryInterface.Version = 1;
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Stack.Parameters.QueryInterface.Interface = (PINTERFACE)&BusInterface;
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Stack.Parameters.QueryInterface.InterfaceType =
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&GUID_BUS_INTERFACE_STANDARD;
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Status = IopInitiatePnpIrp(PhysicalDeviceObject, &IoStatusBlock,
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IRP_MN_QUERY_INTERFACE, &Stack);
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if (NT_SUCCESS(Status))
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{
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Adapter = BusInterface.GetDmaAdapter(BusInterface.Context,
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DeviceDescription, NumberOfMapRegisters);
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BusInterface.InterfaceDereference(BusInterface.Context);
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if (Adapter != NULL)
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return Adapter;
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}
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}
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/*
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* Fallback to HAL.
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*/
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return HalGetDmaAdapter(PhysicalDeviceObject, DeviceDescription,
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NumberOfMapRegisters);
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}
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/* EOF */
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