Description

The value in ECX specifies one of the 64-bit Model Specific Registers of the Pentium processor. The content of that Model-Specific Register is copied into EDX:EAX. EDX is loaded with the high-order 32 bits, and EAX is loaded with the low-order 32 bits.

The following values are used to select model specific registers on the Pentium processor.

┌─────┬──────────────────────┬──────────────────────────────────────────────┐
│VALUE│REGISTER NAME         │DESCRIPTION                                   │
├─────┼──────────────────────┼──────────────────────────────────────────────┤
│ 00H │Machine Check Address │Stores address of cycle causing the exception │
├─────┼──────────────────────┼──────────────────────────────────────────────┤
│ 01H │Machine Check Type    │Stores type of cycle causing the exception    │
└─────┴──────────────────────┴──────────────────────────────────────────────┘

For other values used to perform cache, TLB, and BTB testing and performance monitoring, see the Intel documentation.


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