Date: Tue, 18 Feb 2003 09:11:40 +0200
From: Zaretskii Eli <ezaretski AT elta DOT co DOT il>
Subject: RE: Passing pointers to dpmi_int
To: Paul Cousoulis <paulcsouls AT worldnet DOT att DOT net>, djgpp AT delorie DOT com
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> From: Paul Cousoulis [mailto:paulcsouls AT worldnet DOT att DOT net] 
> Sent: Tuesday, February 18, 2003 1:35 AM
> 
> I'm trying to implement the Virtual DMA Service. In order to lock DMA
> memory I need to pass the address of a structure to int 4b in 
> es:di. The
> physical address should be returned in dds_local, but I keep getting
> zero even though the function seems to otherwise return successfully.
> The code I'm using is:
> >
> >		dr.x.dx = 0;
> >		dr.x.ax = 0x8103;
> >		temp = (int)(&dds_local);
> >		dr.x.es = (unsigned short)(temp>>16);
> >		dr.x.di = (unsigned short)(temp & 0xffff);
> >		if(__dpmi_int(0x4b,&dr)) printf("error\n");

Did you read section 18.13 of the DJGPP FAQ list?


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