how to generate fixed point code from a continuous block model?

I am trying to generate C code for controller and plant models which are continuous in time, so the code shall be generated with floating point support. But the my real-time target (RTlinux kernel) does not support floating point processes. So, I have to come up with a solution of generating code with fixed point processes.

In first place, is it possible to do so? if yes, then could anybody post some possible suggestions.

--

regards