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about kexec support on mips smp

To: Linux MIPS Mailing List <linux-mips@linux-mips.org>
Subject: about kexec support on mips smp
From: "wilbur.chan" <wilbur512@gmail.com>
Date: Mon, 16 Nov 2009 23:22:40 +0800
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Hi all!

Recently , I am trying    kexec smp feature support for ppc64,  and mips64 .

I found that , ppc64  makes  the secondary cpus to spin in a loop
,while in mips64 , the seconday cpus wait until the main cpu  jumped
to kernel entry , and then they(secondary cpus)

jumped to kernel entry too .



So I 've got some questions on the entry point for cpus.

It seemed that , in kernel code , seconday cpus were brought up by
main cpu in a 'init' process .

After initializing , the main cpu send ipi to all  secondary cpus
,waked them up , and  then , secondary cpus jump to a different
'secondary ' entry point. But patches show that ,all cpus

will jumped to the same entry ,so I 'm not sure about this , if all
cpus would have the simillar  boot process  or not.



Any suggestion?

Thank you


regards,

wilbur

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