How to use mtdcr from userland code

[Ayman El-Khashab]

Greetings,

I am developing an app that needs to map pci address space to the PLB on
the ppc460ex.  From what I gather I need to use the mtcdr
instruction/macro to configure the PIM0 space.  However, I cannot figure
out how to use that from userland code.  Is it possible?  Can I change
the PIM some other way?

Thanks