| 摘要 |
A microprocessor includes an MSR and fuses. The microprocessor encounters an instruction requesting access to the MSR and specifying the MSR address, performs a function of the specified MSR address and a value read from the fuses to generate a first result, encrypts the first result with a secret key to generate a second result, compares the second result with an instruction-specified password, and allows the instruction to access the MSR if the second result matches the password and otherwise denies access MSR. Manufacturing subsequent instances of the microprocessor with a different fuse value effectively revokes the password. Alternatively, a control register of the microprocessor may be written by system software to override the fuse value and thereby revoke the password. The function may be XOR or concatenation, the encryption may be AES, and the secret key is externally invisible.
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