hw: make _processor private to Execution_context

ref #1078

base-hw/src/core/kernel/scheduler.cc

@@ -38,7 +38,7 @@ void Kernel::Execution_context::_interrupt(unsigned const processor_id)
 		if (timer()->interrupt_id(processor_id) == irq_id)
 		{
 			/* handle scheduling timeout */
-			_processor->scheduler()->yield();
+			__processor->scheduler()->yield();
 			timer()->clear_interrupt(processor_id);
 			reset_lap_time(processor_id);
 		} else {
@@ -50,3 +50,21 @@ void Kernel::Execution_context::_interrupt(unsigned const processor_id)
 	/* end interrupt request at controller */
 	pic()->finish_request();
 }
+
+
+void Kernel::Execution_context::_schedule()
+{
+	__processor->scheduler()->insert(this);
+}
+
+
+void Kernel::Execution_context::_unschedule()
+{
+	__processor->scheduler()->remove(this);
+}
+
+
+void Kernel::Execution_context::_yield()
+{
+	__processor->scheduler()->yield();
+}

base-hw/src/core/kernel/scheduler.h

@@ -297,9 +297,11 @@ class Kernel::Scheduler
 
 class Kernel::Execution_context : public Cpu_scheduler::Item
 {
-	protected:
+	private:
 
-		Processor * _processor;
+		Processor * __processor;
+
+	protected:
 
 		/**
 		 * Handle an interrupt exception that occured during execution
@@ -308,6 +310,31 @@ class Kernel::Execution_context : public Cpu_scheduler::Item
 		 */
 		void _interrupt(unsigned const processor_id);
 
+		/**
+		 * Insert context into the processor scheduling
+		 */
+		void _schedule();
+
+		/**
+		 * Remove context from the processor scheduling
+		 */
+		void _unschedule();
+
+		/**
+		 * Yield currently scheduled processor share of the context
+		 */
+		void _yield();
+
+
+		/***************
+		 ** Accessors **
+		 ***************/
+
+		void _processor(Processor * const processor)
+		{
+			__processor = processor;
+		}
+
 	public:
 
 		/**
@@ -327,9 +354,14 @@ class Kernel::Execution_context : public Cpu_scheduler::Item
 		/**
 		 * Constructor
 		 *
-		 * \param p  scheduling priority
+		 * \param processor  kernel object of targeted processor
+		 * \param priority   scheduling priority
 		 */
-		Execution_context(Priority const p) : Cpu_scheduler::Item(p) { }
+		Execution_context(Processor * const processor, Priority const priority)
+		:
+			Cpu_scheduler::Item(priority),
+			__processor(processor)
+		{ }
 
 		/**
 		 * Destructor

base-hw/src/core/kernel/thread.cc

@@ -166,21 +166,21 @@ void Thread::_pause()
 void Thread::_schedule()
 {
 	if (_state == SCHEDULED) { return; }
-	_processor->scheduler()->insert(this);
+	Execution_context::_schedule();
 	_state = SCHEDULED;
 }
 
 
 void Thread::_unschedule(State const s)
 {
-	if (_state == SCHEDULED) { _processor->scheduler()->remove(this); }
+	if (_state == SCHEDULED) { Execution_context::_unschedule(); }
 	_state = s;
 }
 
 
 Thread::Thread(unsigned const priority, char const * const label)
 :
-	Execution_context(priority),
+	Execution_context(0, priority),
 	Thread_cpu_support(this),
 	_state(AWAITS_START),
 	_pd(0),
@@ -201,7 +201,7 @@ Thread::init(Processor * const processor, unsigned const pd_id_arg,
 	assert(_state == AWAITS_START)
 
 	/* store thread parameters */
-	_processor = processor;
+	Execution_context::_processor(processor);
 	_utcb_phys = utcb_phys;
 
 	/* join protection domain */
@@ -446,7 +446,7 @@ void Thread::_call_yield_thread()
 {
 	Thread * const t = Thread::pool()->object(user_arg_1());
 	if (t) { t->_receive_yielded_cpu(); }
-	_processor->scheduler()->yield();
+	Execution_context::_yield();
 }
 
 

base-hw/src/core/kernel/vm.h

@@ -63,21 +63,19 @@ class Kernel::Vm : public Object<Vm, MAX_VMS, Vm_ids, vm_ids, vm_pool>,
 		Vm(void           * const state,
 		   Signal_context * const context)
 		:
-			Execution_context(Priority::MIN),
+			Execution_context(multiprocessor()->primary(), Priority::MIN),
 			_state((Vm_state * const)state),
 			_context(context)
-		{
+		{ }
-			_processor = multiprocessor()->primary();
-		}
 
 
 		/****************
 		 ** Vm_session **
 		 ****************/
 
-		void run()   { _processor->scheduler()->insert(this); }
+		void run()   { Execution_context::_schedule(); }
 
-		void pause() { _processor->scheduler()->remove(this); }
+		void pause() { Execution_context::_unschedule(); }
 
 
 		/***********************
@@ -94,7 +92,7 @@ class Kernel::Vm : public Object<Vm, MAX_VMS, Vm_ids, vm_ids, vm_pool>,
 			case Genode::Cpu_state::DATA_ABORT:
 				_state->dfar = Genode::Cpu::Dfar::read();
 			default:
-				_processor->scheduler()->remove(this);
+				Execution_context::_unschedule();
 				_context->submit(1);
 			}
 		}