--- 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
@@ -45,6 +45,7 @@
 #endif // AMD64
 
   static bool supports_sse();
+  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
@@ -378,6 +378,12 @@
 
 }
 
+juint os::cpu_microcode_revision() {
+  juint result = 0;
+  // to implement this, look at the source for ucodeadm -v
+  return result;
+}
+
 extern "C" JNIEXPORT int
 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid,
                           int abort_if_unrecognized) {