[dv, mem_bkdr_util] Implement mem_bkdr_if as class

There have been numerous pain points associated with the inflexibility
of not being able to override the base functionality of the existing
`mem_bkdr_if`, especially in the closed source repo. In this commit, the
existing `mem_bkdr_if` is implemented as a class.

The following are the key changes made:
- Implemented the backdoor interface as a class
- Removed the `MEM_ARRAY_PATH_SLICE` to directly manipulate the
hierarchical path to the memory array by binding the interface to a
sub-path.
- Instead, the class takes the string path to the memory hierarchy as a
runtime input, which is read / written using the DPI-C functions
`uvm_hdl_read` and `uvm_hdl_deposit`.
- There are no parameterizations - all memory attributes are treated as
runtime settings.
- Some optimizations in the overall code.

The class is not used in any of the testbenches in this commit, so that
the review is easy. The subsequent commits achieve that.

Signed-off-by: Srikrishna Iyer <sriyer@google.com>
4 files changed
tree: a56a6479e5d30651e22139a547cd2afd71f27f94
  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. .svlint.toml
  15. .svls.toml
  16. _index.md
  17. apt-requirements.txt
  18. azure-pipelines.yml
  19. check_tool_requirements.core
  20. CLA
  21. COMMITTERS
  22. CONTRIBUTING.md
  23. LICENSE
  24. meson.build
  25. meson_init.sh
  26. meson_options.txt
  27. python-requirements.txt
  28. README.md
  29. tool_requirements.py
  30. toolchain.txt
  31. topgen-generator.core
  32. topgen-reg-only.core
  33. topgen.core
  34. yum-requirements.txt
README.md

OpenTitan

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About the project

OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.

About this repository

This repository contains hardware, software and utilities written as part of the OpenTitan project. It is structured as monolithic repository, or “monorepo”, where all components live in one repository. It exists to enable collaboration across partners participating in the OpenTitan project.

Documentation

The project contains comprehensive documentation of all IPs and tools. You can access it online at docs.opentitan.org.

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Have a look at CONTRIBUTING and our documentation on project organization and processes for guidelines on how to contribute code to this repository.

Licensing

Unless otherwise noted, everything in this repository is covered by the Apache License, Version 2.0 (see LICENSE for full text).