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NdisMFreeSharedMemory (Windows Embedded CE 6.0)

  • Article

1/6/2010

This function frees memory that was previously allocated by NdisMAllocateSharedMemory by the driver of a bus master DMA NIC.

Syntax

VOID NdisMFreeSharedMemory(
  NDIS_HANDLE MiniportAdapterHandle,
  ULONG Length,
  BOOLEAN Cached,
  PVOID VirtualAddress,
  NDIS_PHYSICAL_ADDRESS PhysicalAddress
);

Parameters

  • Length
    [in] Specifies the number of bytes originally allocated.
  • Cached
    [in] Specifies TRUE if the original allocation was cacheable.
  • VirtualAddress
    [in] Specifies the base virtual address returned by NdisMAllocateSharedMemory.
  • PhysicalAddress
    [in] Specifies the corresponding physical address returned by NdisMAllocateSharedMemory.

Return Value

None.

Remarks

If the NIC driver of a bus master DMA device has already made a successful call to NdisMAllocateSharedMemory, it will call NdisMFreeSharedMemory if any of the following occurs:

  • Its MiniportInitialize function is unable to initialize the NIC, so this function must release all existing claims on hardware resources for that NIC before it returns control.
  • The NIC for which the miniport allocated the memory is being removed.
  • The driver is being unloaded either because the system is shutting down or because the user reconfigured the network components used in the machine.

A miniport cannot call NdisMFreeSharedMemory to free a subrange within an allocated shared memory range. The parameters passed to NdisMFreeSharedMemory must match exactly those that were passed to NdisMAllocateSharedMemory.

NdisMFreeSharedMemory cannot be called from a MiniportShutdownfunction.

Requirements

Header ndis.h
Library ndis.dll
Windows Embedded CE Windows CE .NET 4.0 and later

See Also

Reference

NDIS Library Functions
MiniportInitialize
MiniportShutdown
NdisMAllocateSharedMemory