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riscv / riscv-fast-interrupt

Proposal for a RISC-V Core-Local Interrupt Controller (CLIC)
https://jira.riscv.org/browse/RVG-63
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issue #401 - First round of changes to improve clarity of document. Removed mention of U-mode interrupts. #403

Closed james-ball-qualcomm closed 2 months ago

james-ball-qualcomm commented 2 months ago

This PR contains my many updates to the CLIC spec to improve clarity. Based on discussions in the Fast Interrupt TG, I removed references to user-mode interrupts to simplify the specification. If the N extension someday moves forward towards ratification, we can add in support to the CLIC specification at that time.

christian-herber-nxp commented 2 months ago

i went roughly half through this PR for now. I gave some comments, but I don't think I can review this as a whole. In general, it is good to limit the scope of a PR to one issue to enable a good review. E.g. a single PR to fix the notion of mode/level would be easy to review.

james-ball-qualcomm commented 2 months ago

I’ll look at the table build error. Works fine in my VSCode preview but I should be building this first before doing a PR. Sorry, I’m still ramping up on these sorts of tasks.

From: Christian Herber @.> Sent: Wednesday, September 4, 2024 1:01 AM To: riscv/riscv-fast-interrupt @.> Cc: James Ball @.>; Author @.> Subject: Re: [riscv/riscv-fast-interrupt] issue #401 - First round of changes to improve clarity of document. Removed mention of U-mode interrupts. (PR #403)

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@christian-herber-nxp commented on this pull request.

In src/clic.adochttps://github.com/riscv/riscv-fast-interrupt/pull/403#discussion_r1743257742:

+interrupt input. The mideleg CSR (if present) no longer controls interrupt delegation.

+

+=== CLIC Extensions Summary

+

+This table provides a summary of the extensions supported by the CLIC.

+

+[%autowidth]

+|===

+| Extension Name | Description

+

+| smclic | CLIC support for M-mode

+| ssclic | CLIC support for S-mode

+| smclicshv | Selective Hardware Vectoring for M-mode

+| smclicconfig | Allows implementations to support different parameterizations of CLIC extensions

+|

+|===

this table is giving an error in the build process

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james-ball-qualcomm commented 2 months ago

I did the merge since it was approved (hope I'm supposed to do this, I'm still learning GitHub)

christian-herber-nxp commented 2 months ago

I did the merge since it was approved (hope I'm supposed to do this, I'm still learning GitHub)

looks good. I would recommend to do a squash merge in future, to make to have one commit on the main branch per PR.