#RISCV "Wait for Interrupt instruction (WFI) provides a hint to the implementation that the current hart can be stalled until an interrupt ... so a legal implementation is to simply implement WFI as a NOP" 🤔
Source: https://github.com/riscv/riscv-isa-manual/releases/download/Priv-v1.12/riscv-privileged-20211203.pdf
@lupyuen Yes this is legal, just not green.
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@icenowy Yep thanks! I just realised that Linux Boot Code uses WFI + Loop together: https://github.com/torvalds/linux/blob/f6cef5f8c37f58a3bc95b3754c3ae98e086631ca/arch/riscv/kernel/head.S#L185-L188
