diff --git a/include/debug.h b/include/debug.h
index e3c3c93..e8ba7e2 100644
--- a/include/debug.h
+++ b/include/debug.h
@@ -55,5 +55,15 @@
 
 #define ERROR(...)	printf("ERROR: " __VA_ARGS__)
 
+
+/* For the moment this Panic function is very basic, Report an error and
+ * spin. This can be expanded in the future to provide more information.
+ */
+static inline void panic(void)
+{
+	ERROR("PANIC\n");
+	while (1);
+}
+
 #endif /* __ASSEMBLY__ */
 #endif /* __DEBUG_H__ */
diff --git a/include/mmio.h b/include/mmio.h
index b72daca..313448e 100644
--- a/include/mmio.h
+++ b/include/mmio.h
@@ -38,6 +38,9 @@
 extern void mmio_write_32(uintptr_t addr, uint32_t value);
 extern uint32_t mmio_read_32(uintptr_t addr);
 
+extern void mmio_write_64(uintptr_t addr, uint64_t value);
+extern uint64_t mmio_read_64(uintptr_t addr);
+
 #endif /*__ASSEMBLY__*/
 
 #endif /* __MMIO_H__ */