| 摘要 |
The method involves executing instructions provided by a source external to a processor. The instructions is supplied to the processor via I/O to the processor, and, upon receiving an interrupt specifying a secure function, the following sub-steps are performed. The I/O to the processor is disabled, while the secure function specified by the interrupt is performed. The instructions for the secure function are stored in a read-only memory within the processor. On completion of performing the secure function, it then requires executing an exit routine, which enables I/O to the processor by a hardware control circuit and allows resumption of execution of instructions provided by the source external to the processor. The instructions for the exit routine are stored within the read-only memory.
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