linux-kernel - Re: diabling interrupts on pentium 4 processor

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Message-ID: <Pine.LNX.4.61.0611171141180.24086@chaos.analogic.com>
Date:	Fri, 17 Nov 2006 11:45:59 -0500
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.com>
To:	"ranjith kumar" <ranjit_kumar_b4u@...oo.co.uk>
Cc:	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: diabling interrupts on pentium 4 processor

> On 11/16/06, ranjith kumar <ranjit_kumar_b4u@...oo.co.uk> wrote:
> Hi,
>     How to disable interrupts on pentium 4 (or any
> i386)
>     machine?
>
>      I tried to include "cli" instruction in a kernel
> module. But got runtime error.

In a module, "cli" should not be an illegal opcode, but in user-mode
code it is. But, you should not be using 'cli' anywhere. Instead, you
should use a spin-lock to protect a critical section. Check the coding
in any network drivers to see how it is done.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.72 BogoMips).
New book: http://www.AbominableFirebug.com/
_
..

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