[Qemu-devel] couid for x86 CPUs

[Qemu-devel] couid for x86 CPUs

[Ronald Aigner]

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Hi,
Version 0.7.2 from the Website returns invalid cache size for the i386
architecture.
Currently the 'cpuid' instruction with eax==1 returns a processor ID of
0x633 that is an "Intel Pentium II (Klamath)". The Klamath is specified
with 512kB of L2 Cache (see
http://www.pcguide.com/ref/cpu/fam/g6PII-c.html).
However the 'cpuid' instruction with eax==2 returns a descriptor value
of 0x41, which indicates 128kB of L2 Cache (see
http://faydoc.tripod.com/cpu/cpuid.htm). The correct value should be 0x43.
To fix this, line 1317 in file target-i386/helper.c should read:
EAX = 0x430601;

Thanks, Ron.

PS: A hint on the website on where to post bug-reports would be helpful.

PPS: Please include me into reply. I'm not subscribed to the list.
- --
Mit freundlichen Gruessen / with regards
ra3 @ inf.tu-dresden.de
http://os.inf.tu-dresden.de/~ra3/
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Re: [Qemu-devel] couid for x86 CPUs

[ace]

Can you test this with and without kqemu?
When I tested this last, the result of cpuid (and other CPU probing
operations) were differing in these 2 scenarios. Without kqemu, qemu
emulates a P II. With kqemu, some programs are able to find out the real
CPU on the host system.

Peter

Ronald Aigner wrote:

> Hi,
> Version 0.7.2 from the Website returns invalid cache size for the i386
> architecture.
> Currently the 'cpuid' instruction with eax==1 returns a processor ID of
> 0x633 that is an "Intel Pentium II (Klamath)". The Klamath is specified
> with 512kB of L2 Cache (see
> http://www.pcguide.com/ref/cpu/fam/g6PII-c.html).
> However the 'cpuid' instruction with eax==2 returns a descriptor value
> of 0x41, which indicates 128kB of L2 Cache (see
> http://faydoc.tripod.com/cpu/cpuid.htm). The correct value should be 0x43.
> To fix this, line 1317 in file target-i386/helper.c should read:
> EAX = 0x430601;
> 
> Thanks, Ron.
> 
> PS: A hint on the website on where to post bug-reports would be helpful.
> 
> PPS: Please include me into reply. I'm not subscribed to the list.
> --
> Mit freundlichen Gruessen / with regards
> ra3 @ inf.tu-dresden.de
> http://os.inf.tu-dresden.de/~ra3/

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