MMU: Implement a vestigial partition table

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This implements a 1-entry partition table, so that instead of getting
the process table base address from the PRTBL SPR, the MMU now reads
the doubleword pointed to by the PTCR register plus 8 to get the
process table base address.  The partition table entry is cached.

Having the PTCR and the vestigial partition table reduces the amount
of software change required in Linux for Microwatt support.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Paul Mackerras

2021-06-17 20:01:32 +10:00

parent 84473eda1b

commit 18120f153d

14 changed files with 67 additions and 27 deletions

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