[fpv/csr_assert] add csr support for regwen

Issue #3035 recorded compile errors when some module enabled FPV csr
assert. The reason was because of the regwen registers. They could not
be accessed through `reg2hw` or `hw2reg`. To solve this issue, this PR
stored the regwen values locally.
This PR also cleans up a few redundant code.
fpv CSR assert also does not support backdoor write, so the csr assert
will be disabled if backdoor write is enabled.

Right now the only compile error remaining are:
1. alert_handler: the enable register "classa_clren" can be written by
hw. Will need more support on FPV csr assert
2. flash_ctrl: the enable registers in flash_ctrl are not all W0C, reg
`ctrl_regwen` is RO. Will need more support on FPV csr assert

Signed-off-by: Cindy Chen <chencindy@google.com>
8 files changed
tree: 8fb24cf090482fb9335109c7f67cb741cab312a1
  1. .github/
  2. ci/
  3. doc/
  4. hw/
  5. site/
  6. sw/
  7. test/
  8. util/
  9. .clang-format
  10. .dockerignore
  11. .flake8
  12. .gitignore
  13. .style.yapf
  14. _index.md
  15. apt-requirements.txt
  16. azure-pipelines.yml
  17. check_tool_requirements.core
  18. CLA
  19. COMMITTERS
  20. CONTRIBUTING.md
  21. LICENSE
  22. meson.build
  23. meson_init.sh
  24. meson_options.txt
  25. python-requirements.txt
  26. README.md
  27. tool_requirements.py
  28. toolchain.txt
README.md

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