ring on PowerPC

[Bai Shuwei]

thanks all

On 10/31/07, Wang, Baojun <wangbj at 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 at 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 at gmail.com, buroc at 126.com
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