Add OS support to Ara #61
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Instructions with side effects flush the unissued instructions from the controller. The accelerator dispatcher buffer is flushed when this happens and avoids accepting a new instruction, but was not preventing the actual issue during a flush cycle.
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Thank you, @mp-17, for this! I think it would make sense to split these changes into separate PRs upstream to avoid maintaining them out-of-tree. Especially the bug fixes should be upstreamed. If there are any issues with merging specific changes (e.g. the MMU interface), we can still consider doing this here. What do you think? |
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Solve bug in
acc_dispatcherDon't mark vector instructions as "non-speculative" when flushing in the same cycle. Indeed, instructions with side effects flush the unissued instructions from the controller. The accelerator dispatcher buffer is flushed when this happens and avoids accepting a new instruction, but it does not prevent the actual issue during a flush cycle.
Solve non-propagated exception bug:
The exception from the vector accelerator is now correctly propagated to CVA6 backend for commit.
Add MMU interface for accelerator:
CVA6 can now share its MMU with the vector accelerator with a simple FSM and multiplexer.
Extend the instruction tracer to ease debugging:
Add initial support for VLD/VST to CVA6 tracer.
Update signal labels:
Update the nomenclature of the CVA6-Ara interface signals.