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The complete Intel algorithm is available in AP-485, or via anonymous FTP at
==CPUID and [[SMPon x86|multiple processors]]==
Some CPUID attributes require multiple CPUID calls to retrieve (often EAX is first set to 0 to determine the highest attribute request supported, then called again with specific requests). Behavior is undefined if CPUID information from one processor is used to form requests for another (especially in a heterogeneous system). Furthermore, CPUID must be performed on each processor used -- results for one processor have no general ramifications for others (again, especially in a heterogeneous system). Thus, either:
* the process using CPUID must be bound to a single CPU by the system administrator,