Re: Questions about the device driver framework

[Vittore Scolari]

Daniel Wagner wrote:

> A virtual driver is a driver which is on top of a real driver.  The
> virtual driver is port of the operating system and forwards all
> request to the real driver.  The virtual driver has an access control
> list which is OS dependend of course.  The real driver then has only
> to trust one thread, the virtual driver.
I have some questions:
Why there is the need for a virtual driver?
Can't deva, which is OS dependent, trust access to drivers?

Also,
Does all drivers trust each other?
How a bus driver serve and trust device drivers?


Vittore