linux-kernel - Re: Generic Disk Driver in Linux

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Message-ID: <20060824222727.67706.qmail@web83111.mail.mud.yahoo.com>
Date:	Thu, 24 Aug 2006 15:27:27 -0700 (PDT)
From:	Aleksey Gorelov <dared1st@...oo.com>
To:	Phillip Susi <psusi@....rr.com>
Cc:	arjan@...radead.org, jengelh@...ux01.gwdg.de,
	daniel.rodrick@...il.com, linux-kernel@...r.kernel.org,
	kernelnewbies@...linux.org, linux-newbie@...r.kernel.org,
	satinder.jeet@...il.com
Subject: Re: Generic Disk Driver in Linux



--- Phillip Susi <psusi@....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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