diff --git a/c/include/bits.h b/c/include/bits.h
index 85d6ea0..6a841af 100644
--- a/c/include/bits.h
+++ b/c/include/bits.h
@@ -44,11 +44,30 @@ typedef uint8_t  u8;
 
 /* convenience types
  */
+typedef long long int llong;
+typedef unsigned long long int ullong;
 typedef unsigned long int ulong;
 typedef unsigned int uint;
 typedef unsigned short ushort;
 typedef unsigned char uchar;
 
+/* define common types sizes
+ */
+#define BITS_PER_CHAR 8
+
+#ifndef BITS_PER_SHORT
+#define BITS_PER_SHORT (BITS_PER_CHAR * sizeof (short))
+#endif
+#ifndef BITS_PER_INT
+#define BITS_PER_INT   (BITS_PER_CHAR * sizeof (int))
+#endif
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG  (BITS_PER_CHAR * sizeof (long))
+#endif
+#ifndef BITS_PER_LLONG
+#define BITS_PER_LLONG (BITS_PER_CHAR * sizeof (long long))
+#endif
+
 /* count set bits:  10101000 -> 3
  *                  ^ ^ ^
  */
diff --git a/c/include/br.h b/c/include/br.h
index 3bec0ad..8475d55 100644
--- a/c/include/br.h
+++ b/c/include/br.h
@@ -18,6 +18,8 @@
 #ifndef _BR_H
 #define _BR_H
 
+#include "struct-group.h"
+
 /* Indirect stringification.  Doing two levels allows the parameter to be a
  * macro itself.  For example, compile with -DFOO=bar, __stringify(FOO)
  * converts to "bar".
@@ -31,6 +33,17 @@
 #define __PASTE(x, y)       ___PASTE(x, y)
 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
 
+/* unused/used parameters/functions
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-unused-function-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-unused-type-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-unused-variable-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html#index-unused-label-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-used-function-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-used-variable-attribute
+ */
+#define __unused             __attribute__((__unused__))
+#define __used               __attribute__((__used__))
+
 /* see https://lkml.org/lkml/2018/3/20/845 for explanation of this monster
  */
 #define __is_constexpr(x) \
diff --git a/c/include/debug.h b/c/include/debug.h
index fcceefd..1c12acf 100644
--- a/c/include/debug.h
+++ b/c/include/debug.h
@@ -25,6 +25,7 @@
 #ifdef DEBUG_DEBUG
 void debug_init(u32 level);
 void debug_level_set(u32 level);
+u32  debug_level_get(void);
 void _printf debug(u32 level, bool timestamp,
                    u32 indent, const char *src,
                    u32 line, const char *, ...);