did some restructuring, got multitasking almost working

kernel/lib/tasks.h

@@ -0,0 +1,13 @@
+#ifndef KTASKS_H
+#define KTASKS_H
+
+#include <stdint.h>
+
+typedef struct {
+    volatile uint32_t locked;
+} spinlock_t;
+
+void spin_lock(spinlock_t *lock);
+void spin_unlock(spinlock_t *lock);
+
+#endif