| 摘要 |
A microprocessor having a control register to which the manufacturer of the microprocessor may limit access. The microprocessor includes a manufacturing identifier that uniquely identifies the microprocessor and that is externally readable from the microprocessor by a user. The microprocessor also includes a secret key, manufactured internally within the microprocessor and externally invisible. The microprocessor also includes an encryption engine, coupled to the secret key, configured to decrypt a user-supplied password using the secret key to generate a decrypted result in response to a user instruction instructing the microprocessor to access the control register. The user-supplied password is unique to the microprocessor. The microprocessor also includes an execution unit, coupled to the manufacturing identifier and the encryption engine, configured to allow the instruction access to the control register if the manufacturing identifier is included in the decrypted result, and to otherwise deny the instruction access to the control register.
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