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.
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To: djgpp AT delorie DOT com
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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