Re: [FreeDOS-32-dev] Problems with IRQ handlers in floppy driver

[Salvo I. <sa...@us...>]

Hi Luca,

> I think the solution is very simple: instead of doing
> __dpmi_set_protected_mode_interrupt_vector(version.master_pic + irq,
> &handler_address);
> the DJGPP version of fd32_set_handler() should do something like
> __dpmi_set_protected_mode_interrupt_vector(version.master_pic + irq,
> &djgpp_wrapper);
> where djgpp_wrapper() is a function that calls the real handler (looking
> at a dr-env internal handler table), and does the proper EOI; iret on
> return.
>
> In this way, no external difference in the dr-env interface is visible.
> The only thing that we need to do is to introduce a new .c file that is
> linked when the DJGPP version is compiled.

Sounds good. (No, I'm not drinking a beer :-)
I'll try to cook up something tomorrow.

> I also seem to remember that DJGPP provides an alternative to
> __dpmi_set_protected_mode_interrupt_vector(), which takes care of
> sending EOI end doing iret, but I do not remember the details (I had
> some problems with it).

I only remember the __go32_dpmi... as an alternative, but I'll try to browse
the DJGPP's libc documentation.

As a final note... waiting for your signal for release 0.0.2.

Bye,
   Salvo