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From: shenminshi@netscape.net
To: linux-mips@linux-mips.org
Subject: when does "init" become usermode process
Date: Fri, 14 Feb 2003 13:01:33 -0500	[thread overview]
Message-ID: <6105D94A.6A2BDDA3.10683EB2@netscape.net> (raw)

Hi,
  I was reading the kernel boot code toward the end where kernel's init thread execve("/sbin/init",x,x). Execve() calls sys_execve() and do_execve(). All the manpage and kernel document told us the init is the first usermode process running in the system. However, when the execve("/sbin/init",x,x) runs in the kernel (init/main.c), I believe we are still in the kernel mode, aren't we? Unless execve() does the trick to turn init into usermode by setting the KU bit in the STATUS register. I checked the execve() code and its not obvious whether it does this or not. I then check the init source code and it does not mess around the KU bit either.

My question is when and how does init turn itself into usermode.


Thanks

sms

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             reply	other threads:[~2003-02-14 18:02 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-02-14 18:01 shenminshi [this message]
2003-02-14 18:29 ` when does "init" become usermode process Kip Walker

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