--- a/src/hotspot/os_cpu/solaris_x86/os_solaris_x86.hpp	Tue Jul 28 18:40:12 2020
+++ b/src/hotspot/os_cpu/solaris_x86/os_solaris_x86.hpp	Tue Jul 28 19:48:19 2020
@@ -44,5 +44,7 @@
   static void setup_fpu();
 #endif // AMD64
+
+  static juint cpu_microcode_revision();
 
   static jlong rdtsc();
 
--- a/src/hotspot/os_cpu/solaris_x86/os_solaris_x86.cpp	Tue Jul 28 18:40:12 2020
+++ b/src/hotspot/os_cpu/solaris_x86/os_solaris_x86.cpp	Tue Jul 28 19:50:48 2020
@@ -294,6 +294,12 @@
 }
 
 
+juint os::cpu_microcode_revision() {
+  juint result = 0;
+  // to implement this, look at the source for ucodeadm -v
+  return result;
+}
+
 bool PosixSignals::pd_hotspot_signal_handler(int sig, siginfo_t* info,
                                              ucontext_t* uc, JavaThread* thread) {