The other reason would be to map the memory to be non-paged so the driver can also read it at raised IRQL levels.
Furthermore, no thread can preempt it to run another of these special routines because that other routine will run at the same IRQL.
另外一个原因是映*内存到未分页的页面中，以便于驱动也能够在被提升的IRQL等级中读取。
另外，没有线程可以占先它来运行另一个这样的特殊程序，因为其他程序将运行于相同的IRQL。
