[pmp] MSB and LSB of PMP address now params #2328
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Keeping this PR as draft until I confirm the PMP pass rate is unchanged. |
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I've now run Ibex DV on this:
So now marking this as ready for review. |
SamuelRiedel
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Thanks Marno. I have two small nits, but otherwise it looks good to me. I also ran a quick synthesis on your changes and it looks good.
Instead of hardcoding 33 and 2 all over the code base as the most significant and least significant bit of the PMP address, this change creates appropriate parameters in the Ibex package that can be re-used in the rest of the code base. This commit also replaces some hard-coded 16 values with PMP_MAX_REGIONS which was already a parameter in the Ibex package. I thought of adding a parameter for the least significant bit of the PMP address while analysing a question posed by Shutong Jin during the HACK@CHES'25 event.
Functionally pmp_mseccfg and pmp_mseccfg_q are the same when PMP is enabled. However, the RTL is a bit more clear if both the MML and RLB register are referenced through the pmp_mseccfg_q register name. I thought of this clarification while analysing a question posed by Shutong Jin during the HACK@CHES'25 event.
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Instead of hardcoding 33 and 2 all over the code base as the most significant and least significant bit of the PMP address, this change creates appropriate parameters in the Ibex package that can be re-used in the rest of the code base.
This commit also replaces some hard-coded 16 values with PMP_MAX_REGIONS which was already a parameter in the Ibex package.
Finally it makes a slight clarifying change to avoid mixing pmp_mseccfg and pmp_mseccfg_q in the same assignment even though they refer to the same value.