whatis.html

来自「DT2851图形卡NT驱动源码」· HTML 代码 · 共 24 行

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<HTML><HEAD><TITLE>What Is A Device Driver</TITLE>
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<H1>What Is<BR>A<BR>Windows NT Device Driver<BR></H1><A 
href="mailto:dixonw@virtual.union.edu">dixonw@virtual.union.edu</A>
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 </CENTER>The Windows NT operating system eliminates the need for user 
applications to manage protected mode access; however, because NT is a secure 
operating system, other aspects of the project were complicated. Essentially 
Windows NT achieves security by restricting processes to specific address 
spaces, and from preventing user mode processes from directly accessing the 
physical system. In order for a user application to interface with a physical 
device, it must go through a device driver. The driver is a specific application 
who's sole purpose is to provide a user mode application with access to the 
protected subsystem. The philosophy behind this restriction is that the device 
drivers are relatively small and have a very specific purpose. The driver 
consists of discrete, modular components, each having a well defined set of 
functions. Hence, the device drivers tend to have fewer bugs and are more 
thoroughly exercised. </BODY></HTML>

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