iokit/Kernel/IODMACommand.cpp

378 	vm_page_t lastPage;
379 	lastPage = NULL;
382 	    lastPage = state->fCopyNext;
385 		vm_page_set_offset(lastPage, atop_64(address) + idx);
386 		lastPage = vm_page_get_next(lastPage);
390 	if (!lastPage || SHOULD_COPY_DIR(op, target->fMDSummary.fDirection))
392 	    lastPage = state->fCopyNext;
407 		    remapAddr = ptoa_64(vm_page_get_phys_page(lastPage));
433 		lastPage = vm_page_get_next(lastPage);
436 	state->fCopyNext = lastPage;