Creating User-Mode Device Drivers with a Proxy

2006 USENIX Annual Technical Conference

Galen C. Hunt

Others  :  http://www.usenix.org/publications/library/proceedings/usenix-nt97/full_papers/hunt/hunt.pdf
PID  :  9139

来源: CEUR

【 摘 要 】

Writing Windows NT device drivers can be a daunting task. Device drivers must be fully re-entrant, must use only limited resources and must be created with special development environments. Executing device drivers in user-mode offers significant coding advantages. User-mode device drivers have access to all user-mode libraries and applications. They can be developed using standard development tools and debugged on a single machine. Using the Proxy Driver to retrieve I/O requests from the kernel, user-mode drivers can export full device services to the kernel and applications. User-mode device drivers offer enormous flexibility for emulating devices and experimenting with new file systems. Experimental results show that in many cases, the overhead of moving to user-mode for processing I/O can be masked by the inherent costs of accessing physical devices.