[fpc-pascal]Using FPC to write an OS.
prologic at prologitech.com
Fri Jan 3 04:34:06 CET 2003
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
> - 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 usually outdated, but maybe still a good reference).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...
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