powerpc/8xx: Map linear memory with huge pages

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Map linear memory space with 512k and 8M pages whenever
possible.

Three mappings are performed:
- One for kernel text
- One for RO data
- One for the rest

Separating the mappings is done to be able to update the
protection later when using STRICT_KERNEL_RWX.

The ITLB miss handler now need to also handle huge TLBs
unless kernel text in pinned.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c44f0ab5510474f25123d904cd1f4e5c6aa3c1ac.1589866984.git.christophe.leroy@csgroup.eu

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This commit is contained in:

Christophe Leroy 2020-05-19 05:49:24 +00:00 • committed by Michael Ellerman

parent a623bb5861

commit cf209951fa

2 changed files with 51 additions and 3 deletions

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4

arch/powerpc/kernel/head_8xx.S

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50

arch/powerpc/mm/nohash/8xx.c

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