Date: Sat, 29 Oct 94 17:23:00 -0400
From: dj AT stealth DOT ctron DOT com (DJ Delorie)
To: mark AT samson DOT demon DOT co DOT uk
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: accessing real mode regs from gcc


To convert generic int86x calls, you must do some extra work.  Get the
address of the transfer buffer (or allocate a larger one) from
_go32_info_block.  Copy anything that you need to pass a pointer to
into the transfer block, and "fix" the registers so that they point to
where that will appear in real mode (seg=linear>>4, ofs=linear&15).
Then fill in the rest of the registers and do
_go32_dpmi_simulate_int().  Then copy anything back from the transfer
buffer (or other memory) that the TSR returned a pointer to.