[Skiboot] [PATCH v2] core/cpu.c: Add OPAL call to setup Nest MMU

Alistair Popple alistair at popple.id.au
Mon Aug 15 14:39:43 AEST 2016

On Tue, 9 Aug 2016 16:29:21 Balbir Singh wrote:
> On 09/08/16 15:27, Alistair Popple wrote:
> > POWER9 has an off core MMU called the Nest MMU which allows other

Actually this will need a respin. POWER9 has a nest mmu, POWER8 does not so we 
should add a check to return OPAL_UNSUPPORTED on those platforms rather than 
blindly writing to a random SCOM address.



> > units within a chip to perform address translations. The context and
> > setup for translations is handled by the requesting agents, however
> > the Nest MMU does need to know where in system memory the page tables
> > are located.
> > 
> > This patch adds a call to setup the Nest MMU page table pointer on a
> > per-chip basis.
> > 
> > Signed-off-by: Alistair Popple <alistair at popple.id.au>
> Reviewed-by: Balbir Singh <bsingharora at gmail.com>
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