Detect cpu

Pitchu · Post by **Pitchu** » Sat Mar 22, 2008 7:32 am

Hi
While i am passing data about HW to kernel during booting i want to display cpu model like "pentium 4 2.4 ghz.
How to do that?

Combuster · Post by **Combuster** » Sat Mar 22, 2008 7:35 am

Google for CPUID.

lukem95 · Post by **lukem95** » Sat Mar 22, 2008 2:20 pm

CPUID is what you want (as combuster said).

You could also use ACPI and/or MP tables to get this information, as some CPU's don't support the CPUID instruction.

wilsonsamm · Post by **wilsonsamm** » Wed Mar 26, 2008 4:31 am

Some people's way of doing it is to see if the leftmost three bits in FLAGS may be set. If they can, then you know that you have at least an i386, but this method is not always reliable.

mov ax,7000h
push ax
popf
pushf
pop ax
and ax,7000h
cmp ax,7000h
je CPU386
halt
CPU386: nop ; if we get here, then we have at least a 386.