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A brief history of Mac enclaves and exclaves

T1 and T2 chips in Intel Macs, integral in M-series chips, used in Sequoia’s virtual machines at last, and an essential feature in Private Cloud Compute.

Alongside that is a 32-bit Arm CPU running a completely different operating system, sepOS (a custom version of the L4 microkernel), dedicated to handling and working with the secrets protected by its Secure Enclave. All code that can run on a node is part of a trust cache signed by Apple and loaded by the Secure Enclave to ensure that it can’t be changed at runtime. References Posted in Macs, Technology and tagged Apple silicon, exclave, macOS 15, Private Cloud Compute, Secure Enclave, SEP, sepOS, Sequoia, T1, T2, virtualisation, VM.

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