ULONG MiDoesPdeExist64( IN PMMPTE PointerPde ); Routine Description: This routine examines the specified Page Directory Entry to determine if the page table page mapped by the PDE exists. If the page table page exists and is not currently in memory, the working set mutex and, if held, the PFN mutex are released and the page table page is faulted into the working set. The mutexes are required. If the PDE exists, the function returns true. Arguments: PointerPde - Supplies a pointer to the PDE to examine and potentially bring into the working set. TargetProcess - Supplies a pointer to the current process. PfnMutexHeld - Supplies the value TRUE if the PFN mutex is held, FALSE otherwise. Return Value: TRUE if the PDE exists, FALSE if the PDE is zero. Environment: Kernel mode, APCs disabled, WorkingSetLock held.