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Add a note on SMCCC conduits #153

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vstehle merged 1 commit into from
Nov 19, 2025
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Add a note on SMCCC conduits #153

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6 changes: 5 additions & 1 deletion source/chapter3-secureworld.rst
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Expand Up @@ -28,7 +28,11 @@ conform to the Power State Coordination Interface specification [PSCI]_ and to
the SMC Calling Convention [SMCCC]_.

Platforms without EL3 must implement PSCI and SMCCC at EL2 (leaving only EL1
available to an operating system).
available to an operating system). [#ConduitNote]_

.. [#ConduitNote] Refer to [SMCCC]_ § 2.5.3 Conduits for details on the conduit
instructions (SMC & HVC) and their dependence on Exception Levels (EL3 &
EL2).

It is recommended that firmware implements PSCI version 1.0 or later
[#PSCINote]_ and SMCCC version 1.1 or later [#SMCCCNote]_.
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