8b95e84870
As part of the RFC: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/13651, this patch adds the 'cm_prepare_el3_exit_ns' function. The function is a wrapper to 'cm_prepare_el3_exit' function for Non-secure state. When EL2 sysregs context exists (CTX_INCLUDE_EL2_REGS is enabled) EL1 and EL2 sysreg values are restored from the context instead of directly updating the registers. Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com> Change-Id: I9b071030576bb05500d54090e2a03b3f125d1653 |
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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.