4 files changed, 84 insertions, 0 deletions
diff --git a/02-usart/include/arch/stm32l4xxx/peripherals/clock.h b/02-usart/include/arch/stm32l4xxx/peripherals/clock.h
index 6e461de..6f628fd 100644
--- a/02-usart/include/arch/stm32l4xxx/peripherals/clock.h
+++ b/02-usart/include/arch/stm32l4xxx/peripherals/clock.h
@@ -123,4 +123,6 @@ int configure_pll(
     pllm_divisor_t pllm, /* PLL denominator. */
     pll_src_t pllsrc /* PLL source */);
 
+uint8_t get_clock_mhz();
+
 #endif /* CORE_CLOCK_H__ */
diff --git a/02-usart/include/arch/stm32l4xxx/peripherals/usart.h b/02-usart/include/arch/stm32l4xxx/peripherals/usart.h
index e42e31e..a1542f4 100644
--- a/02-usart/include/arch/stm32l4xxx/peripherals/usart.h
+++ b/02-usart/include/arch/stm32l4xxx/peripherals/usart.h
@@ -3,6 +3,7 @@
 
 #include <arch.h>
 #include <stdint.h>
+#include <stdarg.h>
 
 #include "kern/common.h"
 #include "arch/stm32l4xxx/peripherals/rcc.h"
@@ -197,5 +198,7 @@ void usart_transmit_str_sync(__IO usart_t* usart, const char* str);
 
 void usart_printf(__IO usart_t* usart, const char* fmt, ...);
 
+void usart_vprintf(__IO usart_t* usart, const char* fmt, va_list l);
+
 
 #endif /* H__USART_ */
diff --git a/02-usart/include/kern/init.h b/02-usart/include/kern/init.h
new file mode 100644
index 0000000..737b85f
--- /dev/null
+++ b/02-usart/include/kern/init.h
@@ -0,0 +1,67 @@
+#ifndef INIT_H_
+#define INIT_H_
+
+/** Globals annotated with _no_init will not be set during init1 bootup
+ * where the data segement is loaded from flash and the bss segment is
+ * cleared.
+ *
+ * This is useful for routines that run in the init0 boot procedure
+ * that need persistent globals.
+ *
+ * Note that initializing a global annotated with _no_init will have
+ * no effect as the variable will remain uninitialized until explicitly
+ * set by by the program.
+ */
+#define _no_init \
+  __attribute((__section__(".noinit")))
+
+#define init0 \
+  static void init0fn(); \
+  static __attribute((__section__(".init0"))) \
+  __attribute((__used__)) \
+  void(*init0_ptr)() = init0fn; \
+  static void init0fn
+#define init1 \
+  static void init1fn(); \
+  static __attribute((__section__(".init1"))) \
+  __attribute((__used__)) \
+  void(*init1_ptr)() = init1fn; \
+  static void init1fn
+#define init2 \
+  static void init2fn(); \
+  static __attribute((__section__(".init2"))) \
+  __attribute((__used__)) \
+  void(*init2_ptr)() = init2fn; \
+  static void init2fn
+#define init3 \
+  static void init3fn(); \
+  static __attribute((__section__(".init3"))) \
+  __attribute((__used__)) \
+  void(*init3_ptr)() = init3fn; \
+  static void init3fn
+#define init4 \
+  static void init4fn(); \
+  static __attribute((__section__(".init4"))) \
+  __attribute((__used__)) \
+  void(*init4_ptr)() = init4fn; \
+  static void init4fn
+#define init5 \
+  static void init5fn(); \
+  static __attribute((__section__(".init5"))) \
+  __attribute((__used__)) \
+  void(*init5_ptr)() = init5fn; \
+  static void init5fn
+#define init6 \
+  static void init6fn(); \
+  static __attribute((__section__(".init6"))) \
+  __attribute((__used__)) \
+  void(*init6_ptr)() = init6fn; \
+  static void init6fn
+#define init7 \
+  static void init7fn(); \
+  static __attribute((__section__(".init7"))) \
+  __attribute((__used__)) \
+  void(*init7_ptr)() = init7fn; \
+  static void init7fn
+
+#endif /* INIT_H_ */
diff --git a/02-usart/include/kern/log.h b/02-usart/include/kern/log.h
new file mode 100644
index 0000000..5e49def
--- /dev/null
+++ b/02-usart/include/kern/log.h
@@ -0,0 +1,12 @@
+#ifndef LOG_H_
+#define LOG_H_
+
+/*
+ * Defines logging capabilities. This logging unit will enable logging on
+ * the systems main USART output.
+ */
+
+/** Similar to fprintf, but with a stripped-down format-string DSL. */
+void klogf(const char* fmt, ...);
+
+#endif