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86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* FILE: ntoskrnl/io/pnpmgr/pnpdma.c
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* PURPOSE: PnP manager DMA routines
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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 <debug.h>
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#include <wdmguid.h>
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/* PUBLIC FUNCTIONS **********************************************************/
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/*
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* @implemented
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*/
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PDMA_ADAPTER
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NTAPI
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IoGetDmaAdapter(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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/* Try to create DMA adapter through bus driver */
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if (PhysicalDeviceObject)
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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,
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DeviceDescription,
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sizeof(DEVICE_DESCRIPTION));
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Status = IoGetDeviceProperty(PhysicalDeviceObject,
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DevicePropertyLegacyBusType,
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sizeof(INTERFACE_TYPE),
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&PrivateDeviceDescription.InterfaceType,
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&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,
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&IoStatusBlock,
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IRP_MN_QUERY_INTERFACE,
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&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,
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NumberOfMapRegisters);
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BusInterface.InterfaceDereference(BusInterface.Context);
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if (Adapter) return Adapter;
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}
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}
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/* Fall back to HAL */
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return HalGetDmaAdapter(PhysicalDeviceObject,
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DeviceDescription,
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NumberOfMapRegisters);
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}
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