thanks all On 10/31/07, Wang, Baojun <[EMAIL PROTECTED]> 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 [EMAIL PROTECTED] > 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: [EMAIL PROTECTED], [EMAIL PROTECTED]
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