OPPO Kernel Craftsman

Dec 2, 2022 · Information Security

Understanding ARM TrustZone TEE and SMC Calls: Architecture, Conventions, and Implementation

The article explains how ARM TrustZone creates a Secure World Trusted Execution Environment, details the REE‑to‑TEE interaction via Secure Monitor Calls, outlines AArch32/AArch64 register conventions, fast versus yielding SMCs, service registration, and the low‑level boot and handling flow of the Secure Monitor.