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DO NOT MERGE #119

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DO NOT MERGE #119

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Commits on Mar 29, 2022

  1. RISC-V: Implement option to run NuttX in supervisor mode (S-mode) 

    - Add config "ARCH_USE_S_MODE" which controls whether the kernel
  runs in M-mode or S-mode
- Add more MSTATUS and most of the SSTATUS register definitions
- Add more MIP flags for interrupt delegation
- Add handling of interrupts from S-mode
- Add handling of FPU from S-mode
- Add new context handling functions that are not dependent on the trap
  handlers / ecall

NOTE: S-mode requires a companion SW (SBI) which is not yet implemented,
      thus S-mode is not usable as is, yet.
    @pussuw
    pussuw committed Mar 29, 2022
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  2. RISC-V: Implement skeleton for a per CPU structure 

    It might be useful to store things in memory per CPU. The tricky part
is that all CPUs run the same code and see the same memory, so some
kind of centralized access is required.

For now, the structure contains the hart id.

Access to the structure elements is provided via sscratch, which is
unique for every hart!
    @pussuw
    pussuw committed Mar 29, 2022
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