From: ebiederm@xmission.com (Eric W. Biederman)
To: Vivek Goyal <vgoyal@in.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>, gdb <gdb@sources.redhat.com>,
Dave Anderson <anderson@redhat.com>,
lkml <linux-kernel@vger.kernel.org>,
fastboot <fastboot@lists.osdl.org>
Subject: Re: [Fastboot] Re: Query: Kdump: Core Image ELF Format
Date: Thu, 10 Mar 2005 06:59:00 -0000 [thread overview]
Message-ID: <m1br9skn0b.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <1110430955.3574.11.camel@wks126478wss.in.ibm.com>
Vivek Goyal <vgoyal@in.ibm.com> writes:
> I want to fill the virtual addresses of linearly mapped region. That is
> physical addresses from 0 to MAXMEM (896 MB) are mapped by kernel at
> virtual addresses PAGE_OFFSET to (PAGE_OFFSET + MAXMEM). Values of
> PAGE_OFFSET and MAXMEM are already known and hard-coded.
PAGE_OFFSET has a common value of 0xc0000000, on x86. However
that value is by no means fixed. The 4G/4G split changes it
as do some other patches floating around at the time.
On x86-64 I don't know how stable those kinds of offsets are.
> I think I used the terminology kernel virtual address and that is adding
> to the confusion. Kernel virtual addresses are not necessarily linearly
> mapped. What I meant was kernel logical addresses whose associated
> physical addresses differ only by a constant offset.
I know what you meant. I simply meant that things don't look that
constant to me. Especially in Linux where there are enough people
to try most of the reasonable possibilities.
I don't even think it is a bad idea. But I do think we have a different
idea of what is constant.
Eric
next prev parent reply other threads:[~2005-03-10 6:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1110286210.4195.27.camel@wks126478wss.in.ibm.com>
[not found] ` <m1br9um313.fsf@ebiederm.dsl.xmission.com>
2005-03-09 6:42 ` Vivek Goyal
2005-03-09 14:21 ` [Fastboot] " Eric W. Biederman
2005-03-09 15:06 ` Dipankar Sarma
2005-03-10 7:14 ` Eric W. Biederman
2005-03-10 5:01 ` Vivek Goyal
2005-03-10 6:59 ` Eric W. Biederman [this message]
2005-03-15 5:48 ` Vivek Goyal
2005-03-10 8:17 ` Itsuro Oda
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