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RISC-V Nested Interrupt Support
Description
This adds nested interrupt support to the RISC-V port. As a bonus it adds a
xPortIsInsideInterrupt
macro. Inspired by Canaan's port.Test Steps
Tested on a Kendryte K210 64-bit RISC-V MCU with an interrupt-heavy application that would crash reproducibly without this change.
Disclaimer
I'm not a RISC-V or OS programming expert. I only tested this on a single target. I'm not mad if this PR stays open for a long time until someone can confirm its correctness (or not).
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.