ioperm and iopl in gnumach

[Da Zheng]

Hello,

There is some code in gnumach that implements ioperm, but it doesn't work. I 
think tschwinge has told me that.
But could anyone tell why it doesn't work, how much work is left and when it 
will work?

gnumach from the debian repository supports iopl. This gnumach provides an iopl 
device and I find that this device only supports device_map when I read the 
code. but I don't know how to use this device. Does the device provide the same 
function as the iopl system call in Linux? Could anyone give me an example 
showing how to change the I/O privilege level with this device?

Thank you very much,
Zheng Da