At this point the threads are really processes...

src/kernel/include/process.h

@@ -0,0 +1,22 @@
+#pragma once
+#include <queue.h>
+#include <scheduler.h>
+#include <stdint.h>
+
+struct process
+{
+  uint64_t pid;
+  void *stack_ptr;
+  uint64_t state;
+  uint64_t P4;
+  QUEUE_SPOT(runQ);
+  uint8_t stack[];
+};
+
+struct process *process();
+
+struct process *new_process(void (*function)(void));
+void yield();
+void start_scheduler();
+
+void switch_stack(void *old_ptr, void *new_ptr);