From: Davide Libenzi <davidel@xmailserver.org>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: Jamie Lokier <jamie@shareable.org>,
"Randy.Dunlap" <rddunlap@osdl.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: asm (lidt) question
Date: Tue, 22 Jul 2003 10:54:02 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.55.0307221052540.1372@bigblue.dev.mcafeelabs.com> (raw)
In-Reply-To: <Pine.LNX.4.53.0307221347400.2199@chaos>
On Tue, 22 Jul 2003, Richard B. Johnson wrote:
> LIDT is "load interrupt descriptor table". SIDT is "store interrupt
> descriptor table". Only SIDT modifies memory. LIDT reads from memory
> and puts the result into a special CPU register, therefore doesn't
> modify memory.
Indeed, that why this is not really correct :
__asm__ __volatile__("lidt %0": "=m" (var));
even if it generates the same code of :
__asm__ __volatile__("lidt %0": : "m" (var));
- Davide
next prev parent reply other threads:[~2003-07-22 17:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-17 22:28 Randy.Dunlap
2003-07-17 22:36 ` Davide Libenzi
2003-07-17 23:18 ` Davide Libenzi
2003-07-17 23:31 ` Randy.Dunlap
2003-07-17 23:36 ` Davide Libenzi
2003-07-22 17:27 ` Jamie Lokier
2003-07-22 17:31 ` Davide Libenzi
2003-07-22 17:50 ` Richard B. Johnson
2003-07-22 17:54 ` Davide Libenzi [this message]
2003-07-22 18:58 ` Randy.Dunlap
2003-07-22 18:58 ` Davide Libenzi
2003-07-22 19:04 ` Randy.Dunlap
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