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From:	RayeR <glaux AT centrum DOT cz>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: DMA and paging
Date:	Tue, 25 Sep 2007 12:22:27 -0700
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I don't know where is your DMA buffer lying, I can help you only with
my example how to handle with VESA LFB which may be similar

// Allocate a descriptor in LDT and set it up to span the entire VRAM.
    vesa_lfb_selector=__dpmi_allocate_ldt_descriptors(1); // allocate
1 descriptor (desribing our new segment) in LDT and return it's
selector
 
__dpmi_set_segment_base_address(vesa_lfb_selector,meminfo.address); //
set segment base accorning to LFB physical address
    __dpmi_set_segment_limit(vesa_lfb_selector,meminfo.size-1); // set
segment limit accorning to LFB size

then you will use movedata function to transfer physical memory to
your variables in DS or where you want.
Afrer all done don't forget to free descriptor
__dpmi_free_ldt_descriptor(vesa_lfb_selector);

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