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Re: 64 to 32 bit jr

To: "Erik J. Green" <erik@greendragon.org>
Subject: Re: 64 to 32 bit jr
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 9 Apr 2003 03:33:22 +0200
Cc: "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
In-reply-to: <1049727719.3e9192e77cc49@my.visi.com>; from erik@greendragon.org on Mon, Apr 07, 2003 at 03:01:59PM +0000
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On Mon, Apr 07, 2003 at 03:01:59PM +0000, Erik J. Green wrote:

> I am unable to arrange my addresses similarly neatly, mostly I think due to
> fighting with the toolchain I have.  Is it "legal" for me to load a
> kernel using the xkphys address and then do something like:

You may map the kernel into XKSEG (0xc000000000000000).  The kernel
already has an option for that, CONFIG_MAPPED_KERNEL.  It's used as a
ccNUMA optimization on large Origin configurations to map a local copy
of the kernel code to that address range.

  Ralf

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