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From: RayeR <glaux AT centrum DOT cz>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: PM interrupt handling - how to call old old ISR with slower rate than my new ISR
Date: Fri, 02 Nov 2007 03:02:30 -0700
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> the other DPMI functions... "call real mode procedure with IRET frame"
>
> For best performance, also hook the real-mode timer interrupt, else
> there'll be lots of mode switching.

Where can I find the call_real_mode_procedure_with_iret_frame DPMI
wrapper?

Can I call old ISR by _go32_dpmi_simulate_int or similar?
But if I will call RM interrupt I will need to save it's vector as RM
int vector
using _go32_dpmi_get_realmode_interrupt_vector instead of
_go32_dpmi_get_protected_mode_interrupt_vector, right?

Does DJGPP hooks something to timer interrupt in PM or pass it to
old RM ISR?

If I would use hooking RM interrupt I will need to write the ISR
completly in assembler
and then do some magic with transfer buffer to setup it. I'd rather
use PM ISR written in C if possible.

BTW if I use _go32_dpmi_set_protected_mode_interrupt_vector and dont't
call old ISR at all the
system will hang.