src/hotspot/os_cpu/bsd_x86/os_bsd_x86.cpp

*** 799,808 ****
--- 799,820 ----
  
    return addr != NULL;
  #endif // AMD64
  }
  
+ juint os::cpu_microcode_revision() {
+   juint result = 0;
+   char data[8];
+   size_t sz = sizeof(data);
+   int ret = sysctlbyname("machdep.cpu.microcode_version", data, &sz, NULL, 0);
+   if (ret == 0) {
+     if (sz == 4) result = *((juint*)data);
+     if (sz == 8) result = *((juint*)data + 1); // upper 32-bits
+   }
+   return result;
+ }
+ 
  ////////////////////////////////////////////////////////////////////////////////
  // thread stack
  
  // Minimum usable stack sizes required to get to user code. Space for
  // HotSpot guard pages is added later.