pnpdma.c File Reference

#include <ntoskrnl.h>
#include <debug.h>
#include <wdmguid.h>

Include dependency graph for pnpdma.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
PDMA_ADAPTER NTAPI	IoGetDmaAdapter (IN PDEVICE_OBJECT PhysicalDeviceObject, IN PDEVICE_DESCRIPTION DeviceDescription, IN OUT PULONG NumberOfMapRegisters)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 12 of file pnpdma.c.

Function Documentation

IoGetDmaAdapter()

PDMA_ADAPTER NTAPI IoGetDmaAdapter	(	IN PDEVICE_OBJECT	PhysicalDeviceObject,
		IN PDEVICE_DESCRIPTION	DeviceDescription,
		IN OUT PULONG	NumberOfMapRegisters
	)

Definition at line 23 of file pnpdma.c.

{
    NTSTATUS Status;
    ULONG ResultLength;
    BUS_INTERFACE_STANDARD BusInterface;
    IO_STATUS_BLOCK IoStatusBlock;
    IO_STACK_LOCATION Stack;
    DEVICE_DESCRIPTION PrivateDeviceDescription;
    PDMA_ADAPTER Adapter = NULL;
 
    DPRINT("IoGetDmaAdapter called\n");
 
 
    /* Try to create DMA adapter through bus driver */
    if (PhysicalDeviceObject)
    {
        if (DeviceDescription->InterfaceType == PNPBus ||
            DeviceDescription->InterfaceType == InterfaceTypeUndefined)
        {
            RtlCopyMemory(&PrivateDeviceDescription,
                          DeviceDescription,
                          sizeof(DEVICE_DESCRIPTION));
 
            Status = IoGetDeviceProperty(PhysicalDeviceObject,
                                         DevicePropertyLegacyBusType,
                                         sizeof(INTERFACE_TYPE),
                                         &PrivateDeviceDescription.InterfaceType,
                                         &ResultLength);
 
            if (!NT_SUCCESS(Status))
                PrivateDeviceDescription.InterfaceType = Internal;
 
            DeviceDescription = &PrivateDeviceDescription;
        }
 
        Stack.Parameters.QueryInterface.Size = sizeof(BUS_INTERFACE_STANDARD);
        Stack.Parameters.QueryInterface.Version = 1;
        Stack.Parameters.QueryInterface.Interface = (PINTERFACE)&BusInterface;
        Stack.Parameters.QueryInterface.InterfaceType =
            &GUID_BUS_INTERFACE_STANDARD;
 
        Status = IopInitiatePnpIrp(PhysicalDeviceObject,
                                   &IoStatusBlock,
                                   IRP_MN_QUERY_INTERFACE,
                                   &Stack);
 
        if (NT_SUCCESS(Status))
        {
            Adapter = BusInterface.GetDmaAdapter(BusInterface.Context,
                                                 DeviceDescription,
                                                 NumberOfMapRegisters);
 
            BusInterface.InterfaceDereference(BusInterface.Context);
            if (Adapter) return Adapter;
        }
    }
 
    /* Fall back to HAL */
    return HalGetDmaAdapter(PhysicalDeviceObject,
                            DeviceDescription,
                            NumberOfMapRegisters);
}

Referenced by FxDmaEnabler::InitializeResources(), NdisMAllocateMapRegisters(), NdisMInitializeScatterGatherDma(), NdisMRegisterDmaChannel(), StreamClassStartDevice(), USBPORT_StartDevice(), and VideoPortGetDmaAdapter().