[fpc-pascal]Using FPC to write an OS.

[James Mills]

On Fri, Jan 03, 2003 at 12:55:25AM +0100, Marco van de Voort wrote:
> > How do you use FPC for writing your own OS, kernel etc...
> > I've read posts of this before, saying that you use the fakertl in the
> > FPC sources. However that doesn't help much, I need a bit more detail
> > please...
> 
> See it like this:
> 
> - FPC generates general 32-bit code, that is transformed into the right
>   format by the assembler/linker. (though for some platforms FPC contains
>   the assembler). This is in principle not OS dependant, only processor
>   dependant.
> 
> - the rtl is OS dependant, so you'll need to start over. (partially)
>     - A few things (like how to exit a program) need to be always defined.
> 	This (at least part of it) is what's defined in fakertl.
>     - Some language features (like sets, operations on 64-bits types)
> 	require certain helpers to be defined in the rtl. A description is
> 	in the "internal" documentation has some info on that (which is
> 	usually outdated, but maybe still a good reference). I latex'ed it,
> 	and put the PDF on www.stack.nl/~marcov/comparch.pdf
> 
>         Most of these are processor dependant only though, that's why
> 	there is a processor dependant include in the fakertl.
> 
> 	
> Start with the fakertl, and try to build a minimal set of required features
> for what you need in the kernel on top of it, build an ELF binary with it,
> and start it with grub :-)

How do you start it with grub? I have never used grub before...

cheers
James
> 
> 
> _______________________________________________
> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
> http://lists.freepascal.org/mailman/listinfo/fpc-pascal