StorPortFreeDmaMemory - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// storport.h

ULONG StorPortFreeDmaMemory(
  [in]     PVOID               HwDeviceExtension,
  [in]     PVOID               BaseAddress,
  [in]     SIZE_T              NumberOfBytes,
  [in]     MEMORY_CACHING_TYPE CacheType,
  [in_opt] PHYSICAL_ADDRESS    PhysicalAddress
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-storport-storportfreedmamemory)

StorPortFreeDmaMemory function

Description

This function is the extended version of the StorPortFreeContiguousMemorySpecifyCache function. It deallocates a range of noncached memory in the nonpaged portion of the system address space.

Parameters

HwDeviceExtension [in]

A pointer to the hardware device extension for the host bus adapter (HBA).

BaseAddress [in]

The base virtual address to free.

NumberOfBytes [in]

The number of bytes that are allocated to the request. This must be the same number that was supplied as a parameter when the StorPortAllocateContiguousMemorySpecifyCacheNode routine was previously called.

CacheType [in]

The cache type that is used in the call to the StorPortAllocateContiguousMemorySpecifyCacheNode routine.

PhysicalAddress [in_opt]

The physical address of the starting address of the memory block to be deallocated.

Return value

This function returns a STOR_STATUS code such as one of the following.

Return code Description
STOR_STATUS_NOT_IMPLEMENTED This function is not implemented on the active operating system.
STOR_STATUS_SUCCESS The operation was successful.

See also

StorPortAllocateContiguousMemorySpecifyCacheNode

View the official Windows Driver Kit DDI reference

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