Re: i387/FPU init issues...

From: James Courtier-Dutton
Date: Sat May 03 2008 - 13:51:15 EST


H. Peter Anvin wrote:
Thomas Gleixner wrote:

Jan, are you sure that P3 knows the P6 NOPs ? AFAICT its P4, but I
have to dig up the manuals.


Pentium III is the P6 core, so it will.

Intel explicitly documents "all processors with family 6 or F."

-hpa

From the intel manual

0F 1F /0 NOP
The multi-byte form of NOP is available on processors with model encoding:
• CPUID.01H.EAX[Bytes 11:8] = 0110B or 1111B
The multi-byte NOP instruction does not alter the content of a register and will not
issue a memory operation. The instruction’s operation is the same in non-64-bit
modes and 64-bit mode.


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