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Add Documentation for no-std
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Acked-by: Joakim Bech <[email protected]>
Reviewed-by: Sumit Garg <[email protected]>
Signed-off-by: Yuan Zhuang <[email protected]>
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DemesneGH committed May 9, 2024
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Expand Up @@ -14,9 +14,17 @@ TrustZone applications with Rust's standard library (std) and many third-party
libraries (i.e., crates). Teaclave TrustZone SDK is a sub-project of [Apache
Teaclave (incubating)](https://teaclave.apache.org/).

Teaclave TrustZone SDK provides two development modes for Rust TAs: `no-std`
(check out the `no-std` branch) and `std` (check out the `master` branch).
We recommend using `no-std` by default. For a detailed comparison, please refer
to [Comparison](#comparison).

## Table of Contents

- [Quick start with the OP-TEE Repo for QEMUv8](#quick-start-with-the-op-tee-repo-for-qemuv8)
- [TA Development Modes](#ta-development-modes)
- [Comparison](#comparison)
- [Supported Examples](#supported-examples)
- [Quick Start with the OP-TEE Repo for QEMUv8](#quick-start-with-the-op-tee-repo-for-qemuv8)
- [Getting started](#getting-started)
- [Environment](#environment)
- [Develop with QEMUv8](#develop-with-qemuv8)
Expand All @@ -25,11 +33,48 @@ Teaclave (incubating)](https://teaclave.apache.org/).
- [Run Rust Applications](#run-rust-applications)
- [Run Rust Applications in QEMUv8](#run-rust-applications-in-qemuv8)
- [Run Rust Applications on other platforms](#run-rust-applications-on-other-platforms)
- [Test](#test)
- [Documentation](#documentation)
- [Publication](#publication)
- [Contributing](#contributing)
- [Community](#community)


## TA Development Modes

### Comparison

#### `no-std`

- **Pros**:
- Reuses standard Rust tier-1 toolchain targets (`aarch64-unknown-linux-gnu`,
`arm-unknown-linux-gnueabihf`).
- Significant performance improvements.
- Substantial reduction in binary size.

- **Cons**:
- Limited support for third-party crates. In the no-std mode, Trusted Applications
(TAs) are unable to utilize crates dependent on the standard library (std).

#### `std`

- **Pros**:
- Enables the utilization of more third-party crates, including those requiring
`std`, such as `serde_json` and `rustls`, which are essential for functionality.

- **Cons**:
- Manual porting of `std` with infrequent updates. Currently using `std` version
`1.56.1` and `Rust` version `nightly-2021-09-20`. (Planned to update)

### Supported Examples

- **Common**: See
[Overview of OP-TEE Rust Examples](https://teaclave.apache.org/trustzone-sdk-docs/overview-of-optee-rust-examples/).

- **`no-std`**: Excludes `test_serde`, `test_tcp_client`, `test_udp_socket`,
`test_message_passing_interface`, `test_tls_client`, `test_tls_server`.


## Quick start with the OP-TEE Repo for QEMUv8

Teaclave TrustZone SDK has been integrated into the OP-TEE Repo since OP-TEE
Expand All @@ -38,6 +83,9 @@ into OP-TEE's default filesystem for QEMUv8. Follow [this
documentation](https://optee.readthedocs.io/en/latest/building/optee_with_rust.html)
to set up the OP-TEE repo and try the Rust examples!

UPDATES: The `no-std` TA has replaced the original `std` TAs since OP-TEE
Release 4.1.0 (19/Jan/24).

## Getting started

### Environment
Expand Down Expand Up @@ -215,6 +263,12 @@ describes.

Copy the applications to your platform and run.

### Test

In the `tests/` directory, we offer comprehensive tests for examples. The
applications can run on a pre-built QEMU image, independently of cloning the
OP-TEE repo. You can compose a simple test here to validate your application.

## Documentation

- [Overview of OP-TEE Rust
Expand Down

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