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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/03/18 16:10:48 UTC

[GitHub] [incubator-nuttx] pussuw edited a comment on pull request #5782: RISC-V: Implement option to run NuttX in supervisor mode (S-mode)

pussuw edited a comment on pull request #5782:
URL: https://github.com/apache/incubator-nuttx/pull/5782#issuecomment-1072561739


   > 
   > Why not directly handle timer interrupt in S-mode?
   >
   The memory mapped registers are available in M-mode only.
    
   > > * For some reason clearing the interrupt does not work from S-mode, so
   > >   created a call gate to clear the interrupt in M-mode
   > 
   > Could we find the root cause?
   
   I tried to simply clear the interrupt from S-mode but nothing happens. Writing e.g. CLEAR_CSR(sie, SIP_STIP); leaves the interrupt asserted unfortunately. Clearing from M-mode works. I can only assume this is by design, even though it is a bit silly IMO.
   


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