NdisMFreeSharedMemory (Windows Embedded CE 6.0)

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

• MiniportAdapterHandle
  [in] Specifies the handle originally input to MiniportInitialize.

• 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

See Also

Reference

NDIS Library Functions
MiniportInitialize
MiniportShutdown
NdisMAllocateSharedMemory