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Re: [PATCH] MIPS: Calculate proper ebase value for 64-bit kernels

To: David Daney <ddaney@caviumnetworks.com>
Subject: Re: [PATCH] MIPS: Calculate proper ebase value for 64-bit kernels
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 7 Apr 2010 16:39:39 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <1270585790-12730-1-git-send-email-ddaney@caviumnetworks.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1270585790-12730-1-git-send-email-ddaney@caviumnetworks.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.20 (2009-08-17)
On Tue, Apr 06, 2010 at 01:29:50PM -0700, David Daney wrote:

> The ebase is relative to CKSEG0 not CAC_BASE.  On a 32-bit kernel they
> are the same thing, for a 64-bit kernel they are not.
> 
> It happens to kind of work on a 64-bit kernel as they both reference
> the same physical memory.  However since the CPU uses the CKSEG0 base,
> determining if a J instruction will reach always gives the wrong
> result unless we use the same number the CPU uses.

Applied, thanks!

  Ralf

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