diabling interrupts on pentium 4 processor

diabling interrupts on pentium 4 processor

[ranjith kumar]

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.

Thanks in advance.



		
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Re: diabling interrupts on pentium 4 processor

[Heikki Orsila]

On Thu, Nov 16, 2006 at 11:23:12AM +0000, ranjith kumar 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.

Read Documentation/cli-sti-removal.txt.

 - Heikki

Re: diabling interrupts on pentium 4 processor

[Jiri Slaby]

ranjith kumar 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.

UTFG and read LDD3

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E

Re: diabling interrupts on pentium 4 processor

[Doug Reiland]

On 11/16/06, ranjith kumar <ranjit_kumar_b4u@yahoo.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.

Are you doing this at the kernel level or application?

Re: diabling interrupts on pentium 4 processor

[linux-os (Dick Johnson)]

> On 11/16/06, ranjith kumar <ranjit_kumar_b4u@yahoo.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/
_
\x1a\x04

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