Subject: Re: Machine-independent bus DMA interface proposal
To: None <tech-kern@NetBSD.ORG>
From: Jason Thorpe <email@example.com>
Date: 09/24/1996 17:52:56
On Tue, 24 Sep 1996 17:04:46 -0700
Jonathan Stone <jonathan@DSG.Stanford.edu> wrote:
> To repeat an earlier plea: can we rename the "bus_dma_load()"
> and "bus_dma_unload()" operators to be "bus_dma_bind()" and
> "bus_dma_unbind()", respectively?
Oh, I must have missed this request....
Anyhow, let me first explain the name...
bus_dmamap_create() creates a DMA map... as the name implies...
bus_dmamap_load() does the necessary machine-dependent magic, and
loads the map with the mapping. I suppose one could call this
"binding a mapping" ... unload unloads the mapping from the map.
I guess I'm not really objecting to changing the names, tho...
> Last, and most importantly, I thought the purpose of this interface
> was to provide a bus-independent, machine-independent way to write
> *bus* mapping registers, not *board*-level mapping registers. That's
> a fine distinction which seems to *NOT* be being made, and I think it
> absolutely needs to be, or we're tlaking past each other.
It has never been my intention to have this interface write
> Anyone who thinks it's possible or reasonable to write
> driver-level "machine-indepedent" code to handle bus-level mapping
> registers has, IMHO, no place , participating in this discussion.
Jason R. Thorpe firstname.lastname@example.org
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