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Add the Octeon ZUC START and MORE helper operations and model the shared state window used by the hardware interface. This covers the keystream and MAC engine state, including the save-and-restore view that overlaps the HSH/SHA3 bank. Keep the LFSR words in the architectural HSH DAT input registers and the runtime MAC/FSM/result state in the documented HASHIV window. The third MAC lookahead word is generated on demand instead of being kept in a non-architectural shadow slot. Signed-off-by: James Hilliard <james.hilliard1@gmail.com> Message-ID: <20260608-mips-octeon-missing-insns-v2-v16-6-daef7a0d8b04@gmail.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>