I'm working on a windows driver that enables and and installs an interrupt handler for a cpu's local APIC timer. According to the intel manual the apic timer freq is derived from the FSB frequency so I'm looking for a way to obtain that freq in windows. any suggestions would be appreciated.

I was hoping it was stored somewhere in windows but i decided to just calculate it when my driver launches. If anyone is interested I use QueryPerformanceCounter to calculate the time it takes for the APIC timer to count down from 0xFFFFF to 0 at the bus' frequency. I then calculate the FSB freq.

I'm still open to other ideas if there are any.