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>
2007-10-31 6:12 ` Wang, Baojun
2007-10-31 6:12 ` Wang, Baojun
2007-10-31 7:09 ` Bai Shuwei
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1193808996.9928.112.camel@pasglop \
--to=benh@kernel.crashing.org \
--cc=grant.likely@secretlab.ca \
--cc=linuxppc-dev@ozlabs.org \
--cc=linuxppc-embedded@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.