From owner-freebsd-hackers@FreeBSD.ORG  Fri Mar 30 14:24:02 2012
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Date: Fri, 30 Mar 2012 16:20:12 +0200
From: Hans Ottevanger <hans@beastielabs.net>
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To: Mahesh Babu <maheshbabu90@yahoo.co.in>
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
	Giovanni Trematerra <gianni@freebsd.org>
Subject: Re: Context Switch
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On 03/30/12 15:36, Giovanni Trematerra wrote:
> On Thu, Mar 29, 2012 at 7:18 PM, Mahesh Babu<maheshbabu90@yahoo.co.in>  wrote:
>> Which part of the source code in FreeBSD 9 is responsible for making context switching i.e. storing and restoring the process state.
>>
>
> Context switch is split up in machine indipendent code (MI Code) and
> machine dependent code (MD Code)
>
> For MI part take a look at
> mi_switch in sys/kern/kern_sync.c
> sched_switch in sys/kern/sched_ule.c and sys/kern_4bsd.c depending on
> configurated scheduler in the kernel config file.
>
> For MD part search for symbol cpu_switch inside the specific arch directory.
>

For background information you could read "The Book" (a bit dated but 
still quite relevant):

http://www.informit.com/store/product.aspx?isbn=0201702452

And you are especially lucky, since the chapter that is the most 
relevant to you is freely available on-line:

http://www.informit.com/articles/article.aspx?p=366888


Kind regards,

Hans Ottevanger