I dunno how much u have thought about this project  and how far.. but u will have
to use a bit of assembly language for sure.. cant escape. Even I tried an op sys
completely in C.. but ended up using a lot of ASM, so give it a thought. How
will u go with boot process? and rest of the part in java! seems novel coz of
speed of java  based progs. give it a thot too.