Implement time CSR
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Component:Doc
Component:RTL
Type:Enhancement
- Dominant language
- SystemVerilog
- Stars
- 2.1k
- Forks
- 810
- Avg merge
- 5d 23h
- Merged PRs (30d)
- 9
Description
We have `mtime` implemented. When implementing U mode (#88) we also need to implement `time`.
To simplify the implementation we can implement it via software trap handler, and document how such a trap handler should look like.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by examining the existing `mtime` implementation and the U-mode work referenced in #88. Then trace how a software trap handler would provide the `time` CSR behavior. Done means the CSR is implemented through that trap path and the expected trap-handler structure is documented.
Written by the indexing model from the issue text.
Assessment
- Domain
- embedded-iot
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100