From: Bart Hartgers <bart@etpmod.phys.tue.nl>
To: root@chaos.analogic.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: ix86 Atomic ops during DMA...
Date: Mon, 9 Aug 2004 14:31:26 +0200 (CEST) [thread overview]
Message-ID: <20040809123129.792F8507@etpmod.phys.tue.nl> (raw)
In-Reply-To: <Pine.LNX.4.53.0408090809520.7612@chaos>
On 9 Aug, Richard B. Johnson wrote:
How about:
lock andl (%ebx),0xffffffff
Not sure 100% if I have the arguments in the right order ;-).
> I need...
>
> movl (%ebx), %eax # Read status from register in ebx
> movl %eax, (%ebx) # Write it back
>
> ..to occur together without the bus being taken away by a DMA
> operation until these two instructions are complete.
--
Bart Hartgers - TUE Eindhoven
http://plasimo.phys.tue.nl/bart/contact/
next prev parent reply other threads:[~2004-08-09 12:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-09 12:22 Richard B. Johnson
2004-08-09 12:31 ` Bart Hartgers [this message]
2004-08-09 12:38 ` Brian Gerst
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