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Index > OS Construction > How to work with DMA on Intel Machine?

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rhyno_dagreat



Joined: 31 Jul 2006
Posts: 487
Location: Maryland, Unol Daleithiau
rhyno_dagreat
I know DMA means Direct Memory Access where rather than passing through the processor from one device's memory to another it goes through the DMA chip, but how can I use it/program it in my OS? I checked OSDever's site and they don't have much on it.
Post 07 Dec 2006, 18:31
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bubach



Joined: 17 Sep 2004
Posts: 340
Location: Trollhättan, Sweden
bubach
Here's the tutorial where I learned about it:
http://inglorion.net/documents/tutorials/x86ostut/floppy/
Post 07 Dec 2006, 19:53
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rhyno_dagreat



Joined: 31 Jul 2006
Posts: 487
Location: Maryland, Unol Daleithiau
rhyno_dagreat
Funny... I was there a week ago, but for something else! Thanks!
Post 07 Dec 2006, 20:44
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tom tobias



Joined: 09 Sep 2003
Posts: 1320
Location: usa
tom tobias
1. Brey The Intel microprocessors ... 2006 Pearson 0131195069
2. Triebel The 8088 and 8086 microprocessors... 2003 Pearson 0130417742
3. Chebotko Master Class Assembly Language 1995 wrox
These three books all have good examples...All are available by interlibrary loan, though the Brey text may only be available as an older edition, but they will work fine for DMA controller....
Smile
Post 07 Dec 2006, 22:09
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
One thing you need to watch is paging as in Pmode and 64k page as in DMA are not the same.
Post 07 Dec 2006, 22:34
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rhyno_dagreat



Joined: 31 Jul 2006
Posts: 487
Location: Maryland, Unol Daleithiau
rhyno_dagreat
Thanks for all the help!
Post 07 Dec 2006, 23:15
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f0dder



Joined: 19 Feb 2004
Posts: 3170
Location: Denmark
f0dder
And keep in mind that x86 DMA isn't really usable for generic memory blits...
Post 08 Dec 2006, 22:56
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