Re: direct I/O access
- From: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@xxxxxxxxx>
- Date: Thu, 31 May 2007 09:22:38 -0400
In <20070531084755.816A61C0008F@xxxxxxxxxxxxxxxxxxx>, rmgls@xxxxxxxxxx typed:
On Wed, 30 May 2007 12:39:10 -0400, Mike Meyer <mwm-keyword-freebsdhackers2.e313df@xxxxxxxxx> wrote,
Actually, protected mode is just the beginnings of it. I've never done
much x86 assembly, but going from the '020 to the '030 (or maybe it
was the '010 to the '020). I had to start invalidating the hardware
caches after certain operations. After that, I switched to RISC
hardware, which were designed assuming that the real people writing
assembler would be few and far between, and did crazy things like
rearrange the instruction sequence behind your back and add extra
instructions. Modern systems do this kind of stuff as well.
do you think that it would be better to rewrite the soft in C???
in this case, i have more work to do!
first of all, learning C on the finger tip, before working on my soft.
and i thought that it would be very interesting to learn
the heart of FreeBSD.
Well, if you want to learn "the heart" of FreeBSD, I think you'd be
better off working in C. The code that isn't part of FreeBSD on pretty
much every platform would seem to be disqualified as the heart.
This really is a kludge, though. You haven't said what you're trying
to do. If you're trying to keep an old one-of device working, this is
probably the best way. But if it's a real device that other people
might be using, then writing a real device driver, or seeing if you
can make the device work with something like the iic drivers might be
better.
in fact, they are:
- a direct to disk recorder,
- a sampler.
they are not usable by other people, because they were discontinued.
So nobody else has them? You can't pick one up used on eBay? I
personally tend to run all but my most critical servers on
"discontinued" hardware. It's fast enough to do the job running
FreeBSD, and reasonably reliable; it's just not fast enough to run
modern versions of Windows. And I can buy a system and a hot spare for
a fraction of the cost of a new system.
<mike
--
Mike Meyer <mwm@xxxxxxxxx> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.
_______________________________________________
freebsd-hackers@xxxxxxxxxxx mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@xxxxxxxxxxx"
- References:
- Re: direct I/O access
- From: rmgls
- Re: direct I/O access
- Prev by Date: Re: direct I/O access
- Next by Date: Getting the Wine preloader to work in FreeBSD
- Previous by thread: Re: direct I/O access
- Next by thread: Re: direct I/O access
- Index(es):
Relevant Pages
|
|
