Divide source code from other stuff

src/cpuid.c

@@ -0,0 +1,12 @@
+#include "cpuid.h"
+
+void cpuid(unsigned int *eax, unsigned int *ebx,
+                         unsigned int *ecx, unsigned int *edx)
+{
+        asm volatile("cpuid"
+            : "=a" (*eax),
+              "=b" (*ebx),
+              "=c" (*ecx),
+              "=d" (*edx)
+            : "0" (*eax), "2" (*ecx));
+}