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Date:   Wed, 26 Jun 2013 16:47:15 -0700
From:   Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
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To:     "Maciej W. Rozycki" <macro@linux-mips.org>
CC:     Ralf Baechle <ralf@linux-mips.org>,
        "Steven J. Hill" <Steven.Hill@imgtec.com>,
        "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>,
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Subject: Re: [PATCH v2] Revert "MIPS: make CAC_ADDR and UNCAC_ADDR account
 for PHYS_OFFSET"
References: <1371742590-10138-1-git-send-email-Steven.Hill@imgtec.com> <20130626145234.GB7171@linux-mips.org> <gjxqcs1k6ixh0k608l2d5c4p.1372261412004@email.android.com> <20130626162302.GE7171@linux-mips.org> <nh7ue18fnbn1tbs2wsphlis9.1372265400519@email.android.com> <20130626175015.GH7171@linux-mips.org> <51CB3B04.1070903@imgtec.com> <alpine.LFD.2.03.1306262233250.32101@linux-mips.org>
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On 06/26/2013 02:41 PM, Maciej W. Rozycki wrote:
> Ralf,
>   To complete the image, there is a set of new memory access instructions
> added (including but not limited to CACHE) that in the kernel mode
> separates accesses to the user space from accesses to the kernel space,
> i.e. the same virtual address can map differently depending on which
> instruction set it is used with.  I encourage you to have at least a skim
> over the most recent set of MIPS architecture manuals publicly available
> where it all is documented.
>
>    Maciej

Look into http://www.mips.com/auth/MD00091-2B-MIPS64PRA-AFP-03.52.pdf
(registration required). Read sections 4.13, 4.12 and 9.13-9.15.
Ignore anything for 64bit core.

Sorry, I asked David Lau to update MIPS32 actual docs but it can take time.
Right now it is from 2011 year.

- Leonid.