Commits on Sep 23, 2024

1. Add support for HPM counters …

   Implements Hardware Performance Monitoring counters, but only by making the registers available. Their values only change if explicitly written to and all values are legal.
   
   All 32 HPM counters are always implemented (the spec says this "should" be the case), and a platform callback `sys_writable_hpm_counters` is added to allow making any of them read-only. I haven't hooked `sys_writable_hpm_counters` up to CLI flags because Codasip does not use the CLI flags and it is quite tedious, and hopefully going to change when riscv-config is used.

   

   Timmmm committed Sep 23, 2024
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