From: Alan Mimms <alan@packetengines.com>
To: LiuTao <tliu@ict.ac.cn>,
"linuxppc-embedded@lists.linuxppc.org"
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: What does KERNELBASE mean?
Date: Tue, 4 Jan 2000 21:11:15 -0800 [thread overview]
Message-ID: <00010421122803.00773@alan.corp.packetengines.com> (raw)
In-Reply-To: <3872CF70.45BCE11C@ict.ac.cn>
KERNELBASE is the virtual address the physical RAM is mapped to.
On most kernels on PowerPC this is 0xC0000000. If you subtract KERNELBASE from
a virtual address, you get its physical address in RAM, since PowerPC platforms
more or less universally define that RAM starts at 0x00000000. Hence the name
TOPHYS.
a
On Tue, 04 Jan
2000, LiuTao wrote: > Hi:
>
> In linux/arch/ppc/kernel/head.S, what does KERNELBASE mean?
> What does the following mean?
> ".long TOPHYS(__start),0,0"
>
> Thanks.
>
> LiuTao
--
Alan Mimms Packet Engines, Inc. Spokane, Washington [99214-0497]
USA, Earth, Sol, Milky Way, The Local Group, Virgo Supercluster, U0
Despite the cost of living, have you noticed how popular it remains?
-- Steven Wright?
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2000-01-05 5:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-01-05 4:58 What does KERNELBASE mean? LiuTao
2000-01-05 5:07 ` Alan Mimms
2000-01-05 5:11 ` Alan Mimms [this message]
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