How do I determine the max frequency of the processor (Android)

I've used many apps that show the speed in MHz on my phone, but where are they getting the information from? I am trying to get the minimum and maximum frequencies of my processor, but am stuck. I've tried reading from:

/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq

but, the only folders under cpufreq are "power", "subsystem", "uevent", and "topology".

/sys/devices/system/cpu/cpufreq/

Also has no files.

/proc/cpuinfo

Has a lot of information, but it only shows BogoMIPS instead of both.

Is there elsewhere should be looking or is there some special equation that I need to use in order to calculate it from the data that I do have?

Solution

For me,this code works:

String cpuMaxFreq = "";
    RandomAccessFile reader = new RandomAccessFile("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq", "r");
    cpuMaxFreq = reader.readLine();
    reader.close();