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review.trustedfirmware.org / hafnium / hafnium.git / e06384d55458c47df2b9e708c25cca763d946c93
commite06384d55458c47df2b9e708c25cca763d946c93[log] [tgz]
authorKarl Meakin <karl.meakin@arm.com>Fri Nov 01 18:48:53 2024 +0000
committerKarl Meakin <karl.meakin@arm.com>Mon Nov 04 12:50:09 2024 +0000
tree50cd6d7f32a1ec194108aa232b6e88eb84e29013
parent50ef91174b38d2ecd392caec8662af302567b39d [diff]
docs: document VM availability messages

Document VM availability direct message request/responses. Also document
that SP cannot respond to a framework direct request with a
non-framework direct response.

Change-Id: I05da447f5cdae23b250550a1a7bac014d82e2c0a
Signed-off-by: Karl Meakin <karl.meakin@arm.com>
1 file changed
tree: 50cd6d7f32a1ec194108aa232b6e88eb84e29013
  1. .vscode/
  2. build/
  3. docs/
  4. inc/
  5. kokoro/
  6. project/
  7. src/
  8. test/
  9. third_party/
  10. vmlib/
  11. prebuilts
  12. .clang-format
  13. .clang-tidy
  14. .gitignore
  15. .gitmodules
  16. .gn
  17. .readthedocs.yaml
  18. AUTHORS
  19. BUILD.gn
  20. CONTRIBUTING.md
  21. dco.txt
  22. LICENSE
  23. Makefile
  24. navbar.md
  25. pyproject.toml
  26. README.md
README.md

Hafnium

Hafnium is the Secure Partition Manager(SPM) reference implementation, following the Arm's Firmware Framework specification.

It leverages Arm's virtualization extensions in the secure world of Arm's A class of devices (feature introduced with Armv8.4 FEAT_SEL2) to allow multiple Trusted OSes or Applications to run concurrently, inside the Trusted Execution Environment, each running as a Secure Partition (SP). Its main goal is to control the system access given to Trusted OSes, and serve as a mediator to the rest of the system.

For example, it limits the memory use, and handles all system calls from Trusted OS. Thus the SPM can enforce spacial isolation, and enforce some level of access control, protecting other critical system resources such as: the secure monitor, the normal world software stack, the SPM itself and other SPs/Trusted Applications. Other important features are: secure interrupt handling, device assignment, inter-partition communication and with the Normal World Software stack, also known as Rich Execution Environment (REE).

The following diagram shows an overview of a typical aarch64-based system, and where Hafnium fits:

Hafnium Architecture

Get in touch and keep up-to-date at:

See feature requests and bugs through github.

Documentation

To find more about Hafnium, view the full documentation. It includes valuable resources such as: Getting Started guide, Threat Model, and other documentation.