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Intel486™ And Pentium ® Processor Signatures; Feature Flags From Cpuid Instruction - Intel MultiProcessor Specification

Intel multiprocessor specification
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Table 4-5. Intel486 and Pentium Processor Signatures
Family
Model
0000
0000
0100
0000 and 0001
0100
0010
0100
0011
0100
0011
0100
0100
0100
0101
0100
1000
0101
0001
0101
0010
Values not shown are reserved for future processors.
Refer to the documentation of each new processor for its family and model values.
1111
1111
a Intel releases information about stepping numbers as needed.
Table 4-6. Feature Flags from CPUID Instruction
Bit
Name
Description
0
FPU
On-chip Floating
Point Unit
1–6
7
MCE
Machine Check
Exception
8
CX8
CMPXCHG8B
Instruction
9
APIC
On-chip APIC
10–31
Version 1.4
a
Stepping
Description
0000
Not a valid CPU signature.
xxxx
Intel486 DX Processor
xxxx
Intel486 SX Processor
xxxx
Intel487 Processor
xxxx
IntelDX2™ Processor
xxxx
Intel486 SL Processor
xxxx
IntelSX2™ Processor
xxxx
IntelDX4™ Processor
xxxx
Pentium Processors (510\60, 567\66)
xxxx
Pentium Processors (735\90, 815\100)
1111
Not a valid CPU signature. Indicates a processor that is not
an Intel architecture-compatible processor (a graphics
controller, for example)
Comments
The processor contains an FPU that supports the Intel387
processor floating point instruction set.
Reserved.
Exception 18 is defined for machine checks, including CR4.MCE for
controlling the feature. This feature does not define the model-
specific implementations of machine-check error logging reporting
and processor shutdowns. Machine-check exception handlers may
have to depend on processor version to do model-specific
processing of the exception or test for the presence of the standard
machine-check feature.
The 8 byte (64 bits) compare-and-exchange instruction is supported
(implicitly locked and atomic). Introduced by the Pentium
processor.
Indicates that an integrated APIC is present and hardware enabled.
(Software disabling does not affect this bit.)
Reserved.
MP Configuration Table
4-9

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