Increase max num PMPs to 64 (!2279) · Merge requests · OpenHW Group / backup-20241120 / cva6

Eclipse Webmaster requested to merge github/fork/Moschn/increase-pmp-nr into master Jun 20, 2024

Created by: Moschn

According to the current priv spec, 64 is the new maximum number of PMP entries. This commit aligns the core with the spec and allows up to a maximum number of 64 PMP entries. This commit also tries to simplify and unify the CSR read/write logic for PMPs.

The maximum number of PMPs is only selected in cva64a6_mmu

Related to: #2244 (closed) and #2248

Some further notes:

Not yet fully tested. Will need some verification effort to test access to all CSRs, etc.
I found many further PMP-related documentation that mentions 16 entries. This will probably have to be adapted, but I was not sure how some of this documentation was generated, so I did not touch that part yet.

Increase max num PMPs to 64

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