kernel upcall documentation

[Konstantinos Boukis]

Hello,
I am not quite sure whether this is the correct list, my problem is that I want
to send an upcall from the kernel to userland to load a module (kernel threads
cannot call linker_load_module since they do not have a  valid fd_cdir). Is
there any document describing how to make an upcall from the kernel to
userland?
Thanks

Konstantinos