Adding interrupt handler to FC3

[Arjan van de Ven]

On Sun, 2005-08-28 at 15:23 -0500, fdl at scottl.com wrote:
> Hello,
> 
> I am trying to add my own interrupt handler to FC3. I have tried two methods
> of modifying the IDT, both of which work under most kernels I've tried (incl
> the 2.6.9 vanilla kernel) but fail under the FC3 kernel (2.6.9-1.667). I've
> also tried the FC3 kernel with the alternate security models off, and large
> memory support off, but I have the same problem. Although I haven't tried it
> yet personally, I've been told that some code I have working on the vanilla
> 2.6.9 kernel works fine under FC4.
> 
> Method 1 is to just modify the IDT in place. This causes a segfault on FC3.
> 
> Method 2 is to make a copy of the IDT, modify the copy, and then use lidt to
> change the IDT used by the processor to the copy. This causes an immediate
> reboot on FC3.
> 
> Any pointers on what I might be doing wrong? What is the "correct" or
> "officially supported" way of adding an interrupt handler on FC3?

the only way that'll work is to just use request_irq() in your kernel
module. Anything else is such a gross hack that it won't ever work
reliable. (for example, IDT's may well be per cpu, or read only memory)
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