Da Zheng, le Thu 28 Jan 2010 22:06:44 +0800, a écrit : > On 10-1-28 下午9:39, Björn Döbel wrote: > >> You missed my point. I understand that each driver runs in a separate > >> program. > >> The problem is that a device has to find the bus where it is located. In > >> the > >> current implementation, a driver can only scan 32 devices. If we have 33 > >> devices > >> in the system, its driver thinks there isn't such a device and fails to > >> work. > >> > >> So I suggest why not let the logical bus contains all devices in the > >> system. > > > > Because in a secure system you don't want the NIC device driver to see > > all other devices. This is why we need an IO manager that manages access > > to devices on a per-driver basis. > I thought only root could run drivers.
There is no strict architecture limitation (it doesn't even know what root is). Provided the kernel gives I/O permission to a task or projects MMI/O, the latter can run a driver. Samuel
