[PATCH 6/6] powerpc/8xx: implementation of huge pages

Aneesh Kumar K.V aneesh.kumar at linux.vnet.ibm.com
Mon Aug 15 00:25:30 AEST 2016

Christophe Leroy <christophe.leroy at c-s.fr> writes:

> The 8xx has 512k and 8M pages. This patch implements hugepages using
> those sizes.
> On the 8xx, the size of pages is in the PGD entry,
> using PS field (bits 28-29):
> 00 : Small pages (4k or 16k)
> 01 : 512k pages
> 10 : reserved
> 11 : 8M pages
> The implementation uses a mix of what is used on BOOKS and BOOKE,
> as 512k pages are in HUGEPTE tables while for 8M pages we have
> several PGD entries pointing on a leaf HUGEPTE entry
> For the time being, we do not support CPU15 ERRATA if HUGETLB is
> selected

Can you also document here the format for linux page table with different
huge page size. ?

> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>

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