Re: [BUG] x86 kenel won't boot under Virtual PC

[H. Peter Anvin]

H. Peter Anvin wrote:
> Yes, it does:
>
>   /* We need to decide which NOP sequence to use for 32bit and
>      64bit. When -mtune= is used:
>
>      1. For PROCESSOR_I386, PROCESSOR_I486, PROCESSOR_PENTIUM and
>      PROCESSOR_GENERIC32, f32_patt will be used.
>      2. For PROCESSOR_PENTIUMPRO, PROCESSOR_PENTIUM4, PROCESSOR_NOCONA,
>      PROCESSOR_CORE, PROCESSOR_CORE2, and PROCESSOR_GENERIC64,
>      alt_long_patt will be used.
>      3. For PROCESSOR_ATHLON, PROCESSOR_K6, PROCESSOR_K8 and
>      PROCESSOR_AMDFAM10, alt_short_patt will be used.
>
>      When -mtune= isn't used, alt_long_patt will be used if
>      cpu_arch_isa_flags has Cpu686. Otherwise, f32_patt will
>      be used.
>
> "alt_long_patt" uses NOPL and its variants.

I should point out that the code above is from binutils (gas), not from 
gcc.  It is entirely possible that doing something like
"-mtune=core2 -Wa,-mtune=generic" might actually work, but I have not 
dug through the gcc code proper to figure out if that (a) would work, 
and (b) will remain the case...

	-hpa
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