src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp

*** 618,627 ****
--- 618,647 ----
                 major,minor, result ? "DOES" : "does NOT");
    return result;
  #endif // AMD64
  }
  
+ juint os::cpu_microcode_revision() {
+   juint result = 0;
+   char data[2048] = {0}; // lines should fit in 2K buf
+   size_t len = sizeof(data);
+   FILE *fp = fopen("/proc/cpuinfo", "r");
+   if (fp) {
+     while (!feof(fp)) {
+       if (fgets(data, len, fp)) {
+         if (strstr(data, "microcode") != NULL) {
+           char* rev = strchr(data, ':');
+           if (rev != NULL) sscanf(rev + 1, "%x", &result);
+           break;
+         }
+       }
+     }
+     fclose(fp);
+   }
+   return result;
+ }
+ 
  bool os::is_allocatable(size_t bytes) {
  #ifdef AMD64
    // unused on amd64?
    return true;
  #else