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(nasm.info)Section B.4.270

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B.4.270. `RDMSR': Read Model-Specific Registers
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     RDMSR                         ; 0F 32                [PENT,PRIV]

   `RDMSR' reads the processor Model-Specific Register (MSR) whose index
is stored in `ECX', and stores the result in `EDX:EAX'. See also
`WRMSR' (*Note Section B.4.329::).