Xref:	news2.mv.net comp.os.msdos.djgpp:7200
From:	John Luebs <jkluebs AT sprynet DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Inline ASM -- video buffer help!
Date:	Mon, 12 Aug 1996 20:08:09 -0400
Organization:	EpiCenter Software
Lines:	36
Message-ID:	<320FC769.24F5@sprynet.com>
References:	<199608071705 DOT KAA08835 AT bluesky>
Reply-To:	jkluebs AT sprynet DOT com
NNTP-Posting-Host:	dd15-089.compuserve.com
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Kevin Baca wrote:
> 
> > I have a question about this code that was posted here.
> > What is the variable "DosBase"?
> > Everything else works, but I don't know what DosBase is.
> >
> >
> > Here's the code:
> >
> > void bitmap_to_video(struct MemBuf Buffer){
> >
> >       __asm__ __volatile__ ("
> >       pushw %%es;
> >       pushw %%ds;
> >    pushl %%esi;
> >       pushl %%edi;
> >       movw  %0, %%es;
> >       movl  %1, %%ds;
> >       xorl  %%esi, %%esi;
> >       movl  $16000, %%ecx;
> >       movl  $0xa0000, %%edi;
> >       repz;
> >       movsl;
> >       popl  %%edi;
> >       popl  %%esi;
> >       popw  %%ds;
> >       popw  %%es"
> >       :
> 
> I don't see any DosBase here in this code but I assume it's the
> segment selector for conventional DOS memory.  This value is also
> stored in _go32_info_block.selctor_for_linear_memory.  You can get at
> _go32_info_block by including go32.h in your program.
> 
> -Kevin
Or you can use  _dos_ds!

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