By Frank Wildgrube, Intel Corporation
The table titled "Mobile Intel® Core™2 Processor Detection" is intended to help software developers that need to identify mobile processors based on the Intel® Core™2 processor microarchitecture. The software will need to have ring 0 privilege to take advantage of this table due to the execution privilege requirements of the RDMSR instruction. By examining the processor signature returned by CPUID.1.EAX[31:0] and testing the respective MSR Mobile Bit, software can determine if the processor it is executing on is an Intel® mobile processor. Exceptions to this do exist; for example, processor signature 00000F4xh when CPUID.1.EBX[23:16] returns a value > 2. This bit does not indicate mobile processor, but instead indicates a desktop Intel® Pentium® 4 processor that implements the low power boot feature.
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Processor Signature CPUID.1.EAX[31:0]
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Mobile Bit
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Bit meaning
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Additional Notes
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00000F2xh
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MSR 0x2C[21]
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0 = Not Mobile
1 = Mobile Processor
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No TjMax value ever specified.
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00000F3xh
00000F4xh
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MSR 0x2C[21]
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0 = Not Mobile
1 = Mobile Processor
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If this bit is = 1 in a multi-core processor, then the meaning is low power boot and a EIST transition is required to operate at a higher ratio. No TjMax value ever specified.
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00000F6xh
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MSR 0x2C[21]
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0 = Not Mobile
1 = Mobile Processor
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If this bit is = 1 in a multi-core processor, then the meaning is low power boot and a EIST transition is required to operate at a higher ratio. No TjMax value ever specified.
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000006Fxh
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MSR 0x17[28]
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0 = Not Mobile
1 = Mobile Processor
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If this bit is = 1 in a 4 core processor, then the meaning is low power boot and a EIST transition is required to operate at a higher ratio and the TjMax is not valid.
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0001066xh
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MSR 0x17[28]
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0 = Not Mobile
1 = Mobile Processor
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TjMax is only valid if a mobile processor
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0001067xh
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MSR 0x17[28]
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0 = Not Mobile
1 = Mobile Processor
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TjMax is only valid if a mobile processor
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000106Dxh
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MSR 0x17[28]
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0 = Not Mobile
1 = Mobile Processor
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No Mobile processors based on this processor signature.
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