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Any FF-A SMC that arrives from the normal world is handled by the SPMD before being forwarded to the SPMC. Similarly any SMC arriving from the secure world will hit the SPMC first and be forwarded to the SPMD if required, otherwise the SPMC will respond directly. This allows for the existing flow of handling FF-A ABI's when the SPMC resides at a lower EL to be preserved. In order to facilitate this flow the spmd_smc_forward function has been split and control is either passed to the SPMC or it is forwarded as before. To allow this the flags and cookie parameters must now also be passed into this method as the SPMC must be able to provide these when calling back into the SPMD handler as appropriate. Signed-off-by: Marc Bonnici <marc.bonnici@arm.com> Change-Id: I84fee8390023295b9689067e14cd25cba23ca39b |
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readme.rst
Trusted Firmware-A
Trusted Firmware-A (TF-A) is a reference implementation of secure world software for Arm A-Profile architectures (Armv8-A and Armv7-A), including an Exception Level 3 (EL3) Secure Monitor. It provides a suitable starting point for productization of secure world boot and runtime firmware, in either the AArch32 or AArch64 execution states.
TF-A implements Arm interface standards, including:
- Power State Coordination Interface (PSCI)
- Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)
- SMC Calling Convention
- System Control and Management Interface (SCMI)
- Software Delegated Exception Interface (SDEI)
The code is designed to be portable and reusable across hardware platforms and software models that are based on the Armv8-A and Armv7-A architectures.
In collaboration with interested parties, we will continue to enhance TF-A with reference implementations of Arm standards to benefit developers working with Armv7-A and Armv8-A TrustZone technology.
Users are encouraged to do their own security validation, including penetration testing, on any secure world code derived from TF-A.
More Info and Documentation
To find out more about Trusted Firmware-A, please view the full documentation that is available through trustedfirmware.org.
Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.