From: "Bai Shuwei" <baishuwei@gmail.com>
To: "Wang, Baojun" <wangbj@lzu.edu.cn>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: ring on PowerPC
Date: Wed, 31 Oct 2007 15:09:28 +0800 [thread overview]
Message-ID: <f3566d60710310009g4fb46df2t1f854827561a21ac@mail.gmail.com> (raw)
In-Reply-To: <393873503.24962@eyou.net>
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thanks all
On 10/31/07, Wang, Baojun <wangbj@lzu.edu.cn> wrote:
>
> On Wednesday 31 October 2007 13:05:16, Bai Shuwei wrote：
> > Hi, everyone
> > As we know, the program on the X86 can run on the differnt ring(0, 1,
> 2,
> > 3) and the linux kernel run in the ring 0 and user program in the ring
> 3.
> > And now I want to know wether there is a simple mechanism on the PowerPC
> > architecture? thx all!
> >
> > best regards!
> >
> > Buroc
>
> powerpc has a machine state register(MSR), bit MSR_PR present the current
> privilege level, if msr & MSR_PR, then it's from user space, otherwise(msr
> &
> MSR_PR == 0) it's kernel space.
>
> besides, the linux implementation only use ring0 and ring3 under i386,
> ring0
> is highest(kernel space), ring3 is lowest (userspace)
>
> Wang
> --
> Wang, Baojun Lanzhou University
> Distributed & Embedded System Lab http://dslab.lzu.edu.cn
> School of Information Science and Engeneering wangbj@lzu.edu.cn
> Tianshui South Road 222. Lanzhou 730000 .P.R.China
> Tel:+86-931-8912025 Fax:+86-931-8912022
>
>
--
Add: Tianshui South Road 222, Lanzhou, P.R.China
Tel: +86-931-8912025
Zip Code: 730000
URL: oss.lzu.edu.cn
Email: baishuwei@gmail.com, buroc@126.com
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next prev parent reply other threads:[~2007-10-31 7:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <393807697.25590@lzu.edu.cn>
[not found] ` <200710311412.36584.wangbj@lzu.edu.cn>
2007-10-31 6:12 ` ring on PowerPC Wang, Baojun
2007-10-31 7:09 ` Bai Shuwei [this message]
2007-10-31 5:05 Bai Shuwei
2007-10-31 5:18 ` Grant Likely
2007-10-31 5:36 ` Benjamin Herrenschmidt
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