ARM Trusted Firmware - New v0.4 release

The ARM Trusted Firmware team have just released v0.4 under a permissive BSD license to enable the ARM ecosystem with a high quality reference implementation of:

1. Secure Monitor Calls (SMC) Calling Convention

2. Power State Coordination Interface (PSCI)

3. Trusted Boot

The code is secure world low level firmware that can be adopted by silicon partners and software vendors as a common foundation.  It was developed for 64-bit ARMv8A but will be useful for ARMv7A implementations too.  You can download it from Github here:

https://github.com/ARM-software/arm-trusted-firmware/releases

Some of the new features are:

• Supports secure interrupts targeting the Secure-EL1 Payload
• Optionally supports making the BL31 entrypoint)
• Allows platforms with alternative image loading architecture to re-use BL3
• Specified and future-proof interface to BL31
• Isolation of secure memory through TrustZone
• Initializes secure world (e.g. exception vectors, control registers, GIC and interrupts), before transitioning into normal world at EL2
• Handles Secure Monitor Calls conforming to the SMCCC using EL3 runtime services framework
• Handles PSCI SMCs for CPU hotplugidle
• A Test Secure-EL1 Payload and Dispatcher demonstrates Secure Monitor functionality such as world switching, EL1 context management and interrupt routing

Please download and provide feedback to the ARM Trusted  Firmware team.

Thanks!