ViLowerIrql

VOID __stdcall ViLowerIrql(UINT8 OldIrql){
  if( OldIrql < KeGetCurrentIrql() )
    __writecr8(OldIrql);
}

Referenced by:

VfDeadlockAcquireResource
VfDeadlockAfterCallDriver
VfDeadlockBeforeCallDriver
VfDeadlockInitializeResource
VfDeadlockReleaseResource
ViDeadlockDetectionApplySettings
ViDeadlockEmptyDatabase
ViDeadlockRemoveMemoryRangeResources
ViDeadlockRemoveMemoryRangeThreads
ViIsThreadInsidePagingCodePaths