powerpc/64: rtas avoid accessing paca in 32-bit mode

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Commit 177ba7c647 ("powerpc/mm/radix: Limit paca allocation in radix")
limited the paca allocation address to 1G on pSeries because RTAS return
accesses the paca in 32-bit mode:

    On return from RTAS we access the paca variables and we have 64 bit
    disabled. This requires us to limit paca in 32 bit range.

    Fix this by setting ppc64_rma_size to first_memblock_size/1G range.

Avoid this limit by switching to 64-bit mode before accessing any memory.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nicholas Piggin 2017-12-22 21:17:10 +10:00 • committed by Michael Ellerman

parent 98ae0069cb

commit 47fee31dbd

1 changed files with 11 additions and 6 deletions

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arch/powerpc/kernel/entry_64.S

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