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Clarify CBO access size #1431

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May 28, 2024
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Clarify CBO access size #1431

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3 changes: 3 additions & 0 deletions src/cmo.adoc
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Expand Up @@ -337,6 +337,9 @@ _This specification assumes that the above constraints will typically be met for
main memory regions and may be met for certain I/O regions._
====

Additionally, for the purposes of PMP and PMA checks, the access size of a CMO
instruction equals the size of the cache block accessed by the instruction.

The Zicboz extension introduces an additional supported access type PMA for
cache-block zero instructions. Main memory regions are required to support
accesses by cache-block zero instructions; however, I/O regions may specify
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