Kernel: init2 is now launched as a process instead of thread

Also only process can now add threads to scheduler. Nobody should
have raw access to scheduler and everything should be through
Process::current() or irqs (reschedules)

kernel/include/kernel/Scheduler.h

@@ -17,8 +17,6 @@ namespace Kernel
 		void reschedule();
 		void reschedule_if_idling();
 
-		BAN::ErrorOr<void> add_thread(Thread*);
-
 		void set_current_thread_sleeping(uint64_t);
 		[[noreturn]] void set_current_thread_done();
 
@@ -38,6 +36,8 @@ namespace Kernel
 		void advance_current_thread();
 		[[noreturn]] void execute_current_thread();
 
+		BAN::ErrorOr<void> add_thread(Thread*);
+
 	private:
 		struct ActiveThread
 		{
@@ -69,6 +69,8 @@ namespace Kernel
 		BAN::LinkedList<ActiveThread>::iterator m_current_thread;
 
 		uint64_t m_last_reschedule = 0;
+
+		friend class Process;
 	};
 
 }

kernel/kernel/kernel.cpp

@@ -165,9 +165,9 @@ extern "C" void kernel_main()
 
 	MUST(Scheduler::initialize());
 	Scheduler& scheduler = Scheduler::get();
-	MUST(scheduler.add_thread(MUST(Thread::create(init2, tty1, nullptr))));
+	MUST(Process::create_kernel(init2, tty1));
 	scheduler.start();
-
+	
 	ASSERT_NOT_REACHED();
 }