Re: UNDI/PXE driver for GRUB

[Patrick J. LoPresti]

"Yoshinori K. Okuji" <address@hidden> writes:

> IIRC, most PXE ROMs don't support the specification very well. So I
> think it would be much easier to use low-level interfaces rather
> than high-level interfaces.

I am willing to give this a shot.  But can you give me a hint how to
hook an interrupt vector from within GRUB?  In particular, I am
wondering:

    Where is the vector table?

    Will my ISR run in real mode or protected?

    If my routine handles the interrupt, how do I acknowledge it?

    If my routine does not handle the interrupt, how do I forward it
    to the old ISR?

I apologize if these are stupid questions, but I have never hacked on
the x86 at such a low level before.  And I want to use auxiliary
routines already present in GRUB, if there are any.

 - Pat