MmUnmapLockedPages

The MmUnmapLockedPages routine releases a mapping set up by a preceding call to MmMapLockedPages or MmMapLockedPagesSpecifyCache.

VOID 
  MmUnmapLockedPages(
    IN PVOID  BaseAddress,
    IN PMDL  MemoryDescriptorList
    );

Parameters

BaseAddress

Pointer to the base virtual address to which the physical pages were mapped.

MemoryDescriptorList

Pointer to an MDL.

Return Value

None

Headers

Declared in wdm.h and ntddk.h. Include wdm.h or ntddk.h.

Comments

Callers of MmUnmapLockedPages must be running at IRQL <= DISPATCH_LEVEL if the pages were mapped to system space. Otherwise, the caller must be running at IRQL < DISPATCH_LEVEL.

Note that if the call to MmMapLockedPages or MmMapLockedPagesSpecifyCache specified user mode, the caller must be in the context of the original process before calling MmUnmapLockedPages. This is because the unmapping operation occurs in the context of the calling process, and if the context is incorrect the unmapping operation could delete the address range of a random process.

See Also

MmMapLockedPages, MmMapLockedPagesSpecifyCache