[Qemu-devel] Problem with CPU recognition

[Qemu-devel] Problem with CPU recognition

[Sergey Kuzmin]

Hi! I tested MenuetOS in Qemu and it works!
Suggestion: downloading 5 MB is heavy for people with dial-up(about 90% 
of all internet visitors). So probably idea of bundling Qemu with 
smaller OS then Linux one is more appreciated by those people. Zipped 
MenuetOS is smaller then 1 MB, so developers can build package with size 
about 1.8 MB or even smaller.
Question that I have is: I run my program CPUID in emulated MenuetOS and 
got CPU signature (family, model, stepping) = 633.
So it is a Intel Pentium II codenamed Klamath with L2 cache = 128 KB. 
But my program shows that is surprisely have SSE2 support (?), and some 
problem with L1 data cache - unrecognized signature of its size, though 
my program support all cache signatures from Intel docs.

Can you give me information about CPU which is emulated by Qemu? Maybe 
piece of code which contain reaction to CPUID request?

Screenshot with running MenuetOS (and CPUID inside it) is here
http://coolthemes.narod.ru/files/cpuproblem.jpg

Good luck!

Re: [Qemu-devel] Problem with CPU recognition

[Natalia Portillo]

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This was discussed on the mailing list a long ago.

Just it have support for some instructions upper than Pentium II but  
not all, so that is why developers decided to stay with CPUID saying  
Pentium II.

Think itself like a steroid-Cyrix 5x86 (it was a 486 with support for  
some Pentium instructions but not all).

El 03/08/2005, a las 15:47, Sergey Kuzmin escribió:

> Hi! I tested MenuetOS in Qemu and it works!
> Suggestion: downloading 5 MB is heavy for people with dial-up(about  
> 90% of all internet visitors). So probably idea of bundling Qemu  
> with smaller OS then Linux one is more appreciated by those people.  
> Zipped MenuetOS is smaller then 1 MB, so developers can build  
> package with size about 1.8 MB or even smaller.
> Question that I have is: I run my program CPUID in emulated  
> MenuetOS and got CPU signature (family, model, stepping) = 633.
> So it is a Intel Pentium II codenamed Klamath with L2 cache = 128  
> KB. But my program shows that is surprisely have SSE2 support (?),  
> and some problem with L1 data cache - unrecognized signature of its  
> size, though my program support all cache signatures from Intel docs.
>
> Can you give me information about CPU which is emulated by Qemu?  
> Maybe piece of code which contain reaction to CPUID request?
>
> Screenshot with running MenuetOS (and CPUID inside it) is here
> http://coolthemes.narod.ru/files/cpuproblem.jpg
>
> Good luck!
>
>
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
>
>

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