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- 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.
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!
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Hiding spot for the assembly context switch routines. Severely outdated. Added here so they don't get lost if local machine dies.