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opensecura / 3p / lowrisc / opentitan / c42725cdb717f9e059759a26bfbfdc4e37ccf96e
commitc42725cdb717f9e059759a26bfbfdc4e37ccf96e[log] [tgz]
authorGreg Chadwick <gac@lowrisc.org>Fri Mar 19 17:14:37 2021 +0000
committerGreg Chadwick <gac@lowrisc.org>Mon Mar 22 15:44:12 2021 +0000
tree58df0aabafc348a303243c4e73a93849b5a91ecc
parent781738435f6d11f333a50f889b3b87b30f432e61 [diff]
[otbn] Refactor ISS stalling behaviour

Previously the ISS would execute an instruction then stall for some
number of cycles before committing the result. This alters the behaviour
so instructions can explicitly request a stall (via returning False from
OTBN.pre_execute) and multi-cycle instructions (LW/BN.LID are the only
examples so far) will stall themselves before they execute rather than
after.

A seperate OTBNState.non_insn_stall is introduced to support non
instuction related sources of stall. For now this is just used by a
single stall cycle at the beginning of execution.

Signed-off-by: Greg Chadwick <gac@lowrisc.org>
9 files changed
tree: 58df0aabafc348a303243c4e73a93849b5a91ecc
  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

OpenTitan logo

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.

How to contribute

Have a look at CONTRIBUTING 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).