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Re: More than 512MB of memory

To: Rojhalat Ibrahim <ibrahim@schenk.isar.de>
Subject: Re: More than 512MB of memory
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 9 Feb 2005 19:14:44 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <420A2F2D.8050404@schenk.isar.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <41ED20E3.60309@schenk.isar.de> <20050204004028.GC22311@linux-mips.org> <42072264.6000001@schenk.isar.de> <20050208001742.GA15336@linux-mips.org> <42088CFA.6090605@schenk.isar.de> <420A2F2D.8050404@schenk.isar.de>
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On Wed, Feb 09, 2005 at 04:41:33PM +0100, Rojhalat Ibrahim wrote:

> Those messages actually go away when I do not
> define cpu_has_64bit_gp_regs, which is strange
> because the RM9000 definitely has 64bit gp regs.
> Any ideas?

cpu_has_64bit_gp_regs is meant to indicate "CPU has 64-bit registers and
it's actually safe to use them".  This is why it's defined as 0 for all
32-bit kernels where an interrupt would corrupt the upper 32-bits which
we don't save during any kind of exception.

  Ralf

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