diff --git a/sys/amd64/include/specialreg.h b/sys/amd64/include/specialreg.h
index 23d11499bef..49513d93f2f 100644
--- a/sys/amd64/include/specialreg.h
+++ b/sys/amd64/include/specialreg.h
@@ -135,6 +135,15 @@
 #define	CPUID2_POPCNT	0x00800000
 #define	CPUID2_AESNI	0x02000000
 
+/*
+ * Important bits in the Thermal and Power Management flags
+ * CPUID.6 EAX and ECX.
+ */
+#define	CPUTPM1_SENSOR	0x00000001
+#define	CPUTPM1_TURBO	0x00000002
+#define	CPUTPM1_ARAT	0x00000004
+#define	CPUTPM2_EFFREQ	0x00000001
+
 /*
  * Important bits in the AMD extended cpuid flags
  */
diff --git a/sys/i386/include/specialreg.h b/sys/i386/include/specialreg.h
index dd0d4eeea74..73e7a8454be 100644
--- a/sys/i386/include/specialreg.h
+++ b/sys/i386/include/specialreg.h
@@ -132,6 +132,15 @@
 #define	CPUID2_POPCNT	0x00800000
 #define	CPUID2_AESNI	0x02000000
 
+/*
+ * Important bits in the Thermal and Power Management flags
+ * CPUID.6 EAX and ECX.
+ */
+#define	CPUTPM1_SENSOR	0x00000001
+#define	CPUTPM1_TURBO	0x00000002
+#define	CPUTPM1_ARAT	0x00000004
+#define	CPUTPM2_EFFREQ	0x00000001
+
 /*
  * Important bits in the AMD extended cpuid flags
  */