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Message-ID: <4DC82897.7020206@caviumnetworks.com>
Date:   Mon, 09 May 2011 10:47:03 -0700
From:   David Daney <ddaney@caviumnetworks.com>
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To:     Ralf Baechle <ralf@linux-mips.org>
CC:     linux-mips <linux-mips@linux-mips.org>, GCC <gcc@gcc.gnu.org>,
        binutils <binutils@sourceware.org>,
        Prasun Kapoor <prasun.kapoor@caviumnetworks.com>,
        rdsandiford@googlemail.com
Subject: Re: RFC: A new MIPS64 ABI
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On 05/09/2011 07:28 AM, Ralf Baechle wrote:
> On Mon, Feb 21, 2011 at 07:45:41PM +0000, Richard Sandiford wrote:
>
>> David Daney<ddaney@caviumnetworks.com>  writes:
>>> Background:
>>>
>>> Current MIPS 32-bit ABIs (both o32 and n32) are restricted to 2GB of
>>> user virtual memory space.  This is due the way MIPS32 memory space is
>>> segmented.  Only the range from 0..2^31-1 is available.  Pointer
>>> values are always sign extended.
>>>
>>> Because there are not already enough MIPS ABIs, I present the ...
>>>
>>> Proposal: A new ABI to support 4GB of address space with 32-bit
>>> pointers.
>>
>> FWIW, I'd be happy to see this go into GCC.
>
> So am I for the kernel primarily because it's not really a new ABI but
> an enhancement of the existing N32 ABI.
>

The patches are resting peacefully on my laptop.  Now with endorcements 
like these, I may be forced to actually finish them...

David Daney