installing an APIC interrupt handler w/o patching the kernel?

installing an APIC interrupt handler w/o patching the kernel?

[Brinkley Sprunt]

Hi,

I'm developing tools to support the use of the Pentium 4 performance
counters and event-based sampling.  I currently have the tools working
for event-based sampling via the APIC performance counter interrupt.
To setup the handler for the APIC interrupt, I have patched the kernel
in a fashion similar to the approach Mikael Pettersson uses for his
perfctr driver.  However, I would like to avoid patching the kernel
in order to install the handler for the APIC interrupt.  I've attempted
to use request_irq(), free_irq(), prove_irq_on(), and probe_irq_off(),
but these just do not appear to be the appropriate interface for
installing APIC interrupt handlers (is this correct?).

Is there a recommended way to install an APIC interrupt handler without
patching the kernel?

Thanks,

Brink


-----------------------------------
Brinkley Sprunt
Electrical Engineering Department
Bucknell University
Moore Avenue
Lewisburg, PA 17837
Office Phone:   570-577-3397
EE Dept. Phone: 570-577-1234
EE Dept. FAX:   570-577-1822
Email: bsprunt@bucknell.edu
http://www.eg.bucknell.edu/~bsprunt
-----------------------------------

Re: installing an APIC interrupt handler w/o patching the kernel?

[John Levon]

On Tue, Jan 29, 2002 at 10:17:14AM -0500, Brinkley Sprunt wrote:

> Is there a recommended way to install an APIC interrupt handler without
> patching the kernel?

You can set it to NMI delivery and do a horrible hack to install a new IDT
entry. You might want to talk to Gareth Hughes, btw.

regards
john

-- 
"In no sense is [in]stability a reason to move to a new version. It's never a
reason."
	- Bill Gates