Kernel: APs now start their idle threads when scheduler is started

kernel/include/kernel/Scheduler.h

@@ -12,6 +12,7 @@ namespace Kernel
 	public:
 		static BAN::ErrorOr<void> initialize();
 		static Scheduler& get();
+		static bool is_started();
 
 		[[noreturn]] void start();
 

kernel/kernel/Scheduler.cpp

@@ -15,6 +15,7 @@ namespace Kernel
 	extern "C" [[noreturn]] void continue_thread(uintptr_t rsp, uintptr_t rip);
 
 	static Scheduler* s_instance = nullptr;
+	static BAN::Atomic<bool> s_started { false };
 
 	ALWAYS_INLINE static void load_temp_stack()
 	{
@@ -40,12 +41,17 @@ namespace Kernel
 	{
 		ASSERT(Processor::get_interrupt_state() == InterruptState::Disabled);
 		m_lock.lock();
-		ASSERT(!m_active_threads.empty());
+		s_started = true;
 		advance_current_thread();
 		execute_current_thread_locked();
 		ASSERT_NOT_REACHED();
 	}
 
+	bool Scheduler::is_started()
+	{
+		return s_started;
+	}
+
 	Thread& Scheduler::current_thread()
 	{
 		auto* current = Processor::get_current_thread();

kernel/kernel/kernel.cpp

@@ -217,6 +217,7 @@ extern "C" void ap_main()
 
 	dprintln("ap{} initialized", Processor::current_id());
 
-	for (;;)
-		asm volatile("hlt");
+	while (!Scheduler::is_started())
+		__builtin_ia32_pause();
+	Scheduler::get().start();
 }