From: Dan Malek <dan@mvista.com>
To: Gong Zhuo <gongzhuo@163.net>
Cc: Linux PPC Mailing List <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: Any docments analyzing linuxppc kernel and it's policy?
Date: Wed, 13 Sep 2000 12:34:41 -0400 [thread overview]
Message-ID: <39BFACA1.1C6F7CAF@mvista.com> (raw)
In-Reply-To: 014301c01d7f$a1592540$4607a8c0@LocalHost
Gong Zhuo wrote:
> I am reading the source code of linuxppc mm.
Okay.......
> .... It seems that the process
> uses the logical address 0 - 0x7fffffff, and the kernel uses the logical
> address 0xc0000000 -- (0xc0000000 + maxium memory). The rest logical address
> will not be used by anyone. Am I right?
You got the user process part right.....The kernel will map anything
over 0x80000000 in a variety of useful and interesting ways. The system
memory is usually mapped to 0xc0000000, the remainder of the space is
used for mapping I/O devices, other pages of memory with different
attributes (uncached for example). This is processor/board dependent,
so there are many different mappings for this space, although we do
try to keep them somewhat consistent.
> Is there any document analyzing the linuxppc kernel and how does the
> kernel arrange all the logical space ?
I don't know. I do know this could change daily.....
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next parent reply other threads:[~2000-09-13 16:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <014301c01d7f$a1592540$4607a8c0@LocalHost>
2000-09-13 16:34 ` Dan Malek [this message]
2000-09-13 12:27 Any docments analyzing linuxppc kernel and it's policy? Gong Zhuo
2000-09-14 0:22 ` Graham Stoney
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