Processor and operating method for a homogeneous dual computing system

A method for operating a homogeneous dual computing system, comprising:

• planning a processor with multiple cores to provide a trusted core that has an access right to an isolated storage space of a system memory, and a normal core which is homogeneous with the trusted core and is prohibited from accessing the isolated storage space, wherein the trusted core and the normal core share a shared cache;
• and
• in response to a cache flush instruction issued by the normal core, operating the trusted core to initiate and execute a second cache write-back instruction that is different from the first cache write-back instruction, wherein instead of responding to the cache flush instruction issued by the normal core as the second cache write-back instruction, the first cache write-back instruction is executed to write all cache lines of the shared cache back to the system memory;
• and
• according to the second cache write-back instruction, writing isolated data associated with the isolated storage space and cached in the shared cache back to the isolated storage space before flushing of the isolated data cached in the shared cache.