Re: RFC: A new MIPS64 ABI

[David Daney <ddaney@caviumnetworks.com>]

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