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I can detect till now Intel processors... I have also documentation for AMD processors, so, for thows it will be no problems.
I can't find docs about Cyrix and other x86 processors... Can anybody help me?

Thank you!

Detecting the cpu type should be done with the CPUID opcode available in
every PC CPU since 386...for more information on this and more try  :

http://www.sandpile.org/ia32/cpuid.htm

There you'll find all the corresponding CPUstrings that are returned upon
calling of the CPUID command.

For Cyrix cpu's visit www.viatech.com - Cyrix manufacturer.
Then look for C3/CIII in some drop down menus if i remember correctly, then documentation links.
There's different builds of their cpu too , 3 or 4 i think, that have progresively newer documentation to them the better the cpu.