diff --git a/sdk/xtdk/amd64/arfuncs.h b/sdk/xtdk/amd64/arfuncs.h
index 5b75003..6e059dd 100644
--- a/sdk/xtdk/amd64/arfuncs.h
+++ b/sdk/xtdk/amd64/arfuncs.h
@@ -20,10 +20,18 @@ XTCDECL
 VOID
 ArClearInterruptFlag();
 
+XTCDECL
+BOOLEAN
+ArCpuId(IN OUT PCPUID_REGISTERS Registers);
+
 XTCDECL
 VOID
 ArHalt();
 
+XTCDECL
+ULONG_PTR
+ArReadControlRegister(IN USHORT ControlRegister);
+
 XTCDECL
 VOID
 ArWriteControlRegister(IN USHORT ControlRegister,
diff --git a/sdk/xtdk/i686/arfuncs.h b/sdk/xtdk/i686/arfuncs.h
index db6acf9..ceab1ec 100644
--- a/sdk/xtdk/i686/arfuncs.h
+++ b/sdk/xtdk/i686/arfuncs.h
@@ -20,10 +20,18 @@ XTCDECL
 VOID
 ArClearInterruptFlag();
 
+XTCDECL
+BOOLEAN
+ArCpuId(IN OUT PCPUID_REGISTERS Registers);
+
 XTCDECL
 VOID
 ArHalt();
 
+XTCDECL
+ULONG_PTR
+ArReadControlRegister(IN USHORT ControlRegister);
+
 XTCDECL
 VOID
 ArWriteControlRegister(IN USHORT ControlRegister,