From: Aleksey Gorelov <dared1st@yahoo.com>
To: Phillip Susi <psusi@cfl.rr.com>
Cc: arjan@infradead.org, jengelh@linux01.gwdg.de,
daniel.rodrick@gmail.com, linux-kernel@vger.kernel.org,
kernelnewbies@nl.linux.org, linux-newbie@vger.kernel.org,
satinder.jeet@gmail.com
Subject: Re: Generic Disk Driver in Linux
Date: Thu, 24 Aug 2006 15:27:27 -0700 (PDT) [thread overview]
Message-ID: <20060824222727.67706.qmail@web83111.mail.mud.yahoo.com> (raw)
In-Reply-To: <44EE0DDA.5060600@cfl.rr.com>
--- Phillip Susi <psusi@cfl.rr.com> wrote:
> The int 13 calls to the bios can only accept addresses within the first
> 1 MB of memory, and the calls are synchronous, so DMA really doesn't
> matter as the cpu will be busy waiting anyhow while the IO takes place,
> which will wreak all kinds of hell on the rest of the running system,
> including other hardware ISRs.
>
Not that easy. Once you start int13 transfer, your vm86 thread may be
preempted to allow cpu doing something useful, including other ISRs processing.
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next prev parent reply other threads:[~2006-08-24 22:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-24 18:19 Generic Disk Driver in Linux Aleksey Gorelov
2006-08-24 18:36 ` Arjan van de Ven
2006-08-24 19:40 ` Aleksey Gorelov
2006-08-24 20:03 ` Arjan van de Ven
2006-08-24 22:21 ` Aleksey Gorelov
2006-08-25 8:03 ` Arjan van de Ven
2006-08-25 16:50 ` Aleksey Gorelov
2006-08-24 20:36 ` Phillip Susi
2006-08-24 22:27 ` Aleksey Gorelov [this message]
2006-08-25 10:21 ` Helge Hafting
2006-08-25 17:05 ` Aleksey Gorelov
2006-08-25 18:19 ` Greg Freemyer
2006-08-28 10:46 ` Helge Hafting
[not found] <fa.RkJMFmeAVY9kZAODCPJ1Yc8Vtww@ifi.uio.no>
2006-08-25 0:12 ` Robert Hancock
-- strict thread matches above, loose matches on Subject: below --
2006-08-24 12:47 Daniel Rodrick
2006-08-24 13:10 ` Jan Engelhardt
2006-08-24 16:54 ` Ralf Baechle
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