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Subject:	VBE question
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From:	batchex <thedark1NOthSPAM AT phreaker DOT net DOT invalid>
Newsgroups:	comp.os.msdos.djgpp
Message-ID:	<054a4830.80e90c42@usw-ex0105-036.remarq.com>
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X-Wren-Trace:	eHhddXRtKmArLGR1eTlrejtLeHVveTlleGY5dXR4IWonLHYoI2AjIiI3Lg==
Date:	Wed, 29 Mar 2000 11:52:30 -0800
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NNTP-Posting-Date:	Wed, 29 Mar 2000 11:52:28 PST
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Hi,

I'm trying to set some VBE modes with Linear Frame Buffer (LFB).
I've abled to set the mode and map the LFB (at around 3 GB), but
then, how do I use the mapped address.

Here's what I do :

LFBPtr = the mapped address returned by int 31h func. 800h
         ((ebx << 16) + (ecx & 0xFFFF))
for(i=0;i<width;i++)
  LFBPtr[i] = some value

This approach crash my program.

I've read somewhere that I have to allocate a descriptor for use
with the mapped address. But at what base address? limit?

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