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XUANTIE-RV / thead-extension-spec

XuanTie vendor extension Instruction Set spec
Apache License 2.0
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spec: Add XTheadMaee #42

Closed romanheros closed 7 months ago

romanheros commented 7 months ago

We name the mxstatus maee to a specific extension XTheadMaee, which describles whether enable the the extend page attributes in PTE or not.

CLAassistant commented 7 months ago

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cmuellner commented 7 months ago

I don't like so much the fact, that we introduce th.mxstatus here (I would prefer if we just introduce the MAEE bit). But I don't have a good proposal at the moment on how to structure this better. We could add another specification for th.mxstatus (and probably others) full of reserved bits and define only the MAEE bit here. This would clearly scale better, but since we only have one consumer specified yet, it is pointless at this time.

The important details (how to probe a CPU for the feature) are here, so let's keep it as it is for now.