Re: GSoC: CD-ROM booting options

[Alex Roman]

That's what I plan on doing... I want to write a module that for now
just allows me to test various int 13h calls, look at their return
values and get a general idea of how things work.

Thanks for the idea Vesa!


Cheers!

On 07/06/07, Vesa Jääskeläinen <address@hidden> wrote:
> Alex Roman wrote:
> > On 05/06/07, adrian15 <address@hidden> wrote:
> >> GRUB 2 needs to support both cases, but I prefer to see something not
> >> present in GRUB Legacy implemented in GRUB 2 first.
> >
> > Good point... In any case there's some commonality between the two
> > cases and for now I'm working to see if I can read some ElTorito data
> > structures from a bootable CD... Which brings me to the question:
> >
> > Is it possible to call int 13h functions from a GRUB2 module? If yes,
> > what is the (preferred?) way to do it?
>
> You need to add new kernel thunk(s) to grub2/kern/i386/pc/startup.S and
> then make them jump to 16b real mode and then return back to protected
> mode. There are lots of examples in that file. Then make proper include
> file for your calls (most likely you can add it to existing one in this
> include file grub2/include/grub/i386/pc/biosdisk.h).
>
> I would suggest to make testing command that accesses those kernel
> thunks. This way it is easier to test out those API calls.
>
>
>
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--
Alex Roman <address@hidden>