From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <39BFACA1.1C6F7CAF@mvista.com> Date: Wed, 13 Sep 2000 12:34:41 -0400 From: Dan Malek MIME-Version: 1.0 To: Gong Zhuo CC: Linux PPC Mailing List Subject: Re: Any docments analyzing linuxppc kernel and it's policy? References: <014301c01d7f$a1592540$4607a8c0@LocalHost> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: 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/