Hi,
I am using a full-system simulator (Simics) on a simulated OpenSolaris
installation for a research project. The aim of the project is to implement
adaptive processor shutdown for energy savings.
We would like to measure the dependence of the interrupt latency (interrupt
response time) on the power state of a processor.
By adding a special ("magic") assembler instruction to the kernel code, we can
halt the simulation and consequently do memory reads/writes or execute code in
the simulator. I was thinking of adding such a magic instruction at the
beginning of the general interrupt code, and just before the execution of the
actual interrupt handler (for that specific interrupt). I could then find a way
of reading out current system time (I believe this is possible from the
simulator, otherwise I could maybe read out system time directly from memory?).
Is this a correct approach?
I would thus add these magic instructions at line 63 (entry) and right before
lines 558 and 1181 (before the actual handler is called) referring to
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/sun4/ml/interrupt.s.
Is this correct?
In interrupt.s, I see that some kind of timestamp is saved before the interrupt
is called. What purpose does it serve, and where is it stored?
And where can I find a list and explanation of the different assembler
instructions that are used? This would be most useful to me!
Thank you, Thomas
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