[kernel] properly initialize the default thread context very early to avoid crash on pixies

include/kernel/thread.h

@@ -96,6 +96,7 @@ typedef struct thread {
 #define DEFAULT_STACK_SIZE 8192
 
 /* functions */
+void thread_init_early(void);
 void thread_init(void);
 void thread_become_idle(void) __NO_RETURN;
 void thread_set_name(const char *name);

kernel/main.c

@@ -58,6 +58,9 @@ static void call_constructors(void)
 void kmain(void) __NO_RETURN __EXTERNALLY_VISIBLE;
 void kmain(void)
 {
+	// get us into some sort of thread context
+	thread_init_early();
+
 	// early arch stuff
 	arch_early_init();
 

kernel/thread.c

@@ -409,7 +409,7 @@ void thread_sleep(time_t delay)
 	exit_critical_section();
 }
 
-void thread_init(void)
+void thread_init_early(void)
 {
 	int i;
 
@@ -432,6 +432,10 @@ void thread_init(void)
 	current_thread = t;
 }
 
+void thread_init(void)
+{
+}
+
 void thread_set_name(const char *name)
 {
 	strlcpy(current_thread->name, name, sizeof(current_thread->name));