From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: linuxppc-dev@ozlabs.org, linuxppc-embedded@ozlabs.org
Subject: Re: ring on PowerPC
Date: Wed, 31 Oct 2007 16:36:36 +1100 [thread overview]
Message-ID: <1193808996.9928.112.camel@pasglop> (raw)
In-Reply-To: <fa686aa40710302218s3dfe4d42red589fc5692e4c1@mail.gmail.com>
On Tue, 2007-10-30 at 23:18 -0600, Grant Likely wrote:
> On 10/30/07, Bai Shuwei <baishuwei@gmail.com> 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!
>
> Powerpc has 2 privilege levels; user and supervisor. The kernel runs
> in supervisor mode, and user-space runs in user mode.
To be complete here, some implementations have 3 :-) Don't forget
hypervisor mode !
Ben.
next prev parent reply other threads:[~2007-10-31 5:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-31 5:05 ring on PowerPC Bai Shuwei
2007-10-31 5:18 ` Grant Likely
2007-10-31 5:36 ` Benjamin Herrenschmidt [this message]
[not found] <393807697.25590@lzu.edu.cn>
[not found] ` <200710311412.36584.wangbj@lzu.edu.cn>
2007-10-31 6:12 ` Wang, Baojun
2007-10-31 7:09 ` Bai Shuwei
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