John-Mark Gurney wrote:
Ruslan Ermilov wrote this message on Thu, Mar 02, 2006 at 01:26 +0200:
On Tue, Feb 28, 2006 at 07:58:57PM +0000, John-Mark Gurney wrote:
jmg 2006-02-28 19:58:57 UTC
FreeBSD src repository
Modified files:
share/man/man9 bus_dma.9
Log:
update examples to use the correct terms that was never updated when the
earlier descriptions were gone over...
MFC after: 3 days
Revision Changes Path
1.32 +3 -3 src/share/man/man9/bus_dma.9
Not enough of fixing: "DMA read" and "DMA write" are also entangled here.
Nope... WRITE == DMA read... Read the descriptions of the flags
very carefully... If you aren't confused, you don't understand it..
The reason you're confused is the reason why everyone gets it wrong,
and no one ever gets it correct the first time trying to figure out
which one to use...
Think of it from the perspective of the driver doing an operation. If
the driver is reading a block off the disk, then you want to use the
PREREAD/POSTREAD operations. Likewise for writes. It is done this way
for clarity in the driver. I can't imagine how many bugs we'd have if
write == read in the driver sources.
Scott
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