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- Develop final charter and plan with the group and send to Chairs (tech-chairs@lists.riscv.org) for approval within 4 weeks
- Fill in DoD Plan tab in checklist and send to chairs for approval of any deliverables that don't match the defaults along with any requested waivers
- Freeze-time preliminary POC definition approved by IC
- Fill in task group and specification status spreadsheet information including extension or extension group names, projected dates, DoD component effort sizing, DoD tasks your group needs resource help with,...
- Develop Rationale document and send to chairs for approval
- Notify TSC and Chairs when you complete this milestone and include any waivers and an updated DoD spreadsheet.
- Plan: RISCV has prioritized RVA22. expect CLIC to possibly be ratified at similar times with other embedded extensions like Zfinx, new compressed, rv32e, p-extension. So CLIC still on roadmap but probably next gen RISC-V grouping. Continue working on issues and refining spec.
- Hypervisor support? One simple option is CLIC doesn’t work with H? Both CLIC and AIA are evolving. CLIC problematic places: table read hardware vectoring. Otherwise no real complication. If systems have both AIA and CLIC, how would it work. Maybe don’t need to worry about it?
- Impact of N-extension on CLIC?
Charter
- Current Charter at https://github.com/riscv/groups/tree/main/Fast-Interrupts to be moved to https://github.com/riscv-admin-docs (possibly renamed)
- Develop a low-latency, vectored, priority-based, preemptive interrupt scheme for interrupts directed to a single hart, compatible with the existing RISC-V standards. Provide both hardware specifications and software ABIs/APIs. Standardize compiler conventions for annotating interrupt handler functions.
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- Latest Draft Fast Interrupt Specification (v0.9-draft-20210511)20210525)
- clarified 32-bit writes to clicint registers are legal but effects are not defined.
- clarified that MPRV and SUM are obeyed on vector table accesses
- Added explanation of xinhv operation during xret.
- What's next:
- 34 36 outstanding issues to be addressed. (previously 3635).
Encoding/OpCode consistency review
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