i finally got the kernel to far call the child but i cannot call back
the reaon why is the kernel is built with the tiny memory model

To be honest, I am not really sure what you are trying to do. Are you trying to do callbacks?

read the last 2 pages or so if this viewtopic.php?f=6&t=36 thread

There are a few ways you can do it...Linux allows system calls via interrupts.

However, you could also just write a Shared Object system that reads shared objects compiled by GCC and link it on linux with your code, and then run it again... There is quite a bit that would go into that, but you would have better luck that trying to write a compiler...I did that once...ended badly...lol...(Also it would prolly just be easier for you to port GCC to your OS, that is my plan for now).