c-code function into VHDL?

i have to calculates lots of constants, dependant only of 1 generic 
value. I can do that in C or in Octave (Matlab-like language).

I don know how to load those constants, i've been doing it "by hand" in 
the VHDL header, first calculating them, and them putting them into 
matrixes in an array type. Can i implement the c-code (or matlab code) 
into the vhdl code like some kind of function? Have in mind that i'm not 
asking for sinthetizing this secuential code for calculation, i'm just 
looking for the ability to know the number of components and length of 
signals by every "layer" in my design.

Thanks a lot