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Date: Mon, 5 Dec 2005 14:59:24 +1100
From: Paul Mackerras <paulus@samba.org>
To: Giuliano Pochini <pochini@denise.shiny.it>
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Cc: LinuxPPC-dev <linuxppc-dev@ozlabs.org>
Subject: Re: CPU off power consumption
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Giuliano Pochini writes:

> Any hint on how to debug it ?  Where is the code that enables/disables the
> cpus ?  Where is the sleep loop ?

The initial sleep loop is in ROM.  A CPU that is being offlined will
enter low_cpu_die() in arch/ppc/platforms/pmac_sleep.c and will go to
sleep at the mtmsr about 40 lines into that function.

Paul.