1. A method comprising: receiving a primitive instruction into a trusted cryptographic processor; and regulating power to one or more functional units within the trusted cryptographic processor using power from a power management unit that is controlled by the trusted cryptographic processor, wherein the regulating is based on an identification of which of the one or more functional units are to execute a cryptographic operation based on the primitive instruction, wherein regulating power to the one or more functional units comprises decoding an occupancy tag within the primitive instruction, wherein the occupancy tag identifies at least one of the one or more functional units to execute a cryptographic operation.