linux-kernel - Re: Hooking to APIC timer on SMP 32-bit X86 system

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Message-id: <47F9368E.7070107@shaw.ca>
Date:	Sun, 06 Apr 2008 14:46:06 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	YM Yen <yminyen@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Hooking to APIC timer on SMP 32-bit X86 system

YM Yen wrote:
> hi,
> 
> I am looking for a way to program the APIC timer in a kernel module so 
> that the module depends only on the hardware timer instead of the timer 
> provided by the kernel. Programming the LVT is easy, however I can't 
> find a way to have the Linux kernel to call my interrupt service routine 
> in addition to smp_apic_timer_interrupt().
> 
> Is doing this even possible? There doesn't seem to be any sort of hook 
> or notifier chain I can install a ISR to. Thanks in advance.

It might be possible, but likely not easy and not recommended. Why is a 
kernel timer not sufficient for what you need?
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