Add better logging capabilities, including the ability to panic.

1 files changed, 36 insertions, 0 deletions

diff --git a/src/kern/panic.c b/src/kern/panic.c
new file mode 100644
index 0000000..8708456
--- /dev/null
+++ b/src/kern/panic.c
@@ -0,0 +1,36 @@
+#include "arch.h"
+#include "kern/panic.h"
+#include "kern/log.h"
+#include "kern/init.h"
+#include "arch/stm32l4xxx/peripherals/clock.h"
+#include "kern/gpio/sysled.h"
+#include "kern/gpio/gpio_manager.h"
+#include "kern/delay.h"
+
+#include <stdarg.h>
+
+#ifdef ARCH_STM32L4
+_Noreturn void panic(const char* fmt, ...)
+{
+
+  if (get_system_init_level() > INIT_LEVEL_2) {
+    va_list l;
+    va_start(l, fmt);
+
+    kerr_logf("** Kernel Panic! **\n");
+    kerr_vlogf(fmt, l);
+
+    set_system_clock_MHz(4); /* reduce power usage while we do nothing. */
+    for(;;);
+  } else {
+    set_system_clock_MHz(4); /* reduce power usage while we do nothing. */
+    gpio_reserved_pin_t pin3 = get_sysled();
+    for (;;) {
+      set_gpio_pin_high(pin3);
+      delay(100000);
+      set_gpio_pin_low(pin3);
+      delay(100000);
+    }
+  }
+}
+#endif