Turn threads into processes by giving them unique page directories

src/kernel/include/proc.h

@@ -1,25 +1,26 @@
 #pragma once
 #include <stdint.h>
 
-struct thread
+struct process
 {
-    struct thread *q_next;
-    uint64_t tid;
+    uint64_t pid;
     void *stack_ptr;
     uint64_t state;
+    uint64_t P4;
+    struct process *q_next;
     uint8_t stack[];
 };
 
-// proc/thread.c
-extern struct thread *current_thread;
+// proc/process.c
+extern struct process *current_proc;
 
 // proc/swtch.S
 void *switch_stack(void *out, void *in);
 
-// proc/thread.c
-struct thread *new_thread(void (*function)(void));
-struct thread *thread();
+// proc/process.c
+struct process *new_process(void (*function)(void));
+struct process *proc();
 
 // proc/scheduler.c
-void scheduler_insert(struct thread *new);
+void scheduler_insert(struct process *new);
 void start_scheduler();