NdisMFreeSharedMemory (Windows CE 5.0)

Windows CE 5.0
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This function frees memory that was previously allocated by NdisMAllocateSharedMemory by the driver of a bus master DMA NIC.

VOID NdisMFreeSharedMemory(
  NDIS_HANDLE MiniportAdapterHandle,
  ULONG Length,
  BOOLEAN Cached,
  PVOID VirtualAddress,


[in] Specifies the handle originally input to MiniportInitialize.
[in] Specifies the number of bytes originally allocated.
[in] Specifies TRUE if the original allocation was cacheable.
[in] Specifies the base virtual address returned by NdisMAllocateSharedMemory.
[in] Specifies the corresponding physical address returned by NdisMAllocateSharedMemory.

Return Values



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 MiniportShutdown function.


OS Versions: Windows CE .NET 4.0 and later.
Header: Ndis.h.
Link Library: Ndis.dll.

See Also

MiniportInitialize | MiniportShutdown | NdisMAllocateSharedMemory

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