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From:	Eph <t DOT ephraim AT gmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: calling a RM function which is placed below 1 MB
Date:	Thu, 24 Jul 2008 01:30:36 -0700 (PDT)
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Thx for your hint. I thought:

memset(&regs, 0, sizeof(__dpmi_regs));

Zeros it all so this should not matter isn't it?

Ciao Ephraim

On 23 Jul., 20:45, "Rod Pemberton" <do_not_h DOT  DOT  DOT  AT nohavenot DOT cmm> wrote:
> "Eph" <t DOT ephr DOT  DOT  DOT  AT gmail DOT com> wrote in message
>
> news:ca0df607-1be3-4358-b84f-f0ccddde3197 AT d77g2000hsb DOT googlegroups DOT com...
>
>
>
> > I've problems to get a call to
> > __dpmi_simulate_real_mode_procedure_retf_stack working correctly.
> > My problem is, that I need to call a 16Bit real Mode function placed
> > in Memory below 1MB, which expects three parameters to be placed on
> > the RM Stack.(see comments in the code).
>
> > Below the code, how I tried to use the function:
>
> > ---------------
> > __dpmi_regs regs;
> > struct {
> > unsigned long u1;
> > unsigned long u2;
> > unsigned long u3;
> > } stack;
>
> > memset(&stack, 0, sizeof(stack));
>
> > stack.u1 = parm1; // expected at bp[14]
> > stack.u2 = parm2; // expected at bp[10]
> > stack.u3 = parm3; // expected at bp[06]
>
> > memset(&regs, 0, sizeof(__dpmi_regs));
>
> > regs.x.cs = seg; // segment of the function entry
> > regs.x.ip = ofs; // offset of the function entry
>
> DPMI 0.9 says ss:sp must be zero for the DPMI host to provide a real mode
> stack, or ss:sp must point to a valid real mode stack.  DJGPP doc's
> (libc.info) say ss:sp and flags must be set to valid values or zero.
>
> regs.x.ss=0;
> regs.x.sp=0;
>
> The DJGPP doc's don't state which "flags" must be set (DPMI or __dpmi_regs):
>
> regs.x.flags=0; /* __dpmi_regs  flags */
> regs.h.bh=0; /* DPMI flags */
>
> But, it's likely the doc's were referring to the DPMI flags...  (BH bit 0 =
> 1 resets A20 and PIC)  You'll also need to set any other registers that the
> function uses since the call copies _all_ registers.
>
> > __dpmi_simulate_real_mode_procedure_retf_stack(&regs, sizeof(stack) /
> > 2, &stack);
> > ---------------
>
> > What am I doing wrong?
>
> Not sure.
>
> > Can anyone please point it out!
>
> Try the above.  Let us know.
>
> Rod Pemberton

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