From:	James Deuchar <J DOT A DOT Deuchar AT dur DOT ac DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Getting physical addresses for DMA
Date:	22 Jan 1999 10:34:59 GMT
Organization:	University of Durham, Durham, UK.
Lines:	18
Message-ID:	<01be45f3$55dbf300$f2cfea81@secom144.dur.ac.uk>
NNTP-Posting-Host:	secs246.dur.ac.uk
X-Newsreader:	Microsoft Internet News 4.70.1161
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 setup the DMA controller on a PCI ATM Network card so that I
can transfer some data from system memory onto the cards ram. The djgpp FAQ
suggests either allocating a buffer within the fist MB using a
__dpmi_allocate_dos_memory call or using a software interrupt INT 4Bh to
access the Virtual DPMI Services. I have Ralf Browns interrupt list but I'm
not entirely sure which of the INT 4B calls to make....as far as I'm
concerned I just want to get the physical address of a variable - I don't
know anything about dma buffers and locking regions...HELP PLEASE !!!


 thanks.....
-- 
J DOT A DOT Deuchar AT dur DOT ac DOT uk
Dept. of Engineering
Durham University
United Kingdom

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