Kernel keeps information about each cpu

- kernel maintains a cpu_info array which contains various
  information about each cpu as filled when each cpu boots

- the information contains idetification, features etc.

kernel/arch/i386/arch_clock.c

@@ -115,6 +115,7 @@ PRIVATE void estimate_cpu_freq(void)
 
 	cpu_freq = mul64(div64u64(tsc_delta, PROBE_TICKS - 1), make64(system_hz, 0));
 	cpu_set_freq(cpuid, cpu_freq);
+	cpu_info[cpuid].freq = div64u(cpu_freq, 1000000);
 	BOOT_VERBOSE(cpu_print_freq(cpuid));
 }