/*
 * \brief  Implementation of Thread API interface for core
 * \author Stefan Kalkowski
 * \author Martin Stein
 * \date   2014-02-27
 */

/*
 * Copyright (C) 2014-2017 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU Affero General Public License version 3.
 */

/* Genode includes */
#include <base/thread.h>
#include <base/sleep.h>
#include <base/env.h>

/* base-internal stack */
#include <base/internal/stack.h>
#include <base/internal/native_utcb.h>

/* core includes */
#include <map_local.h>
#include <kernel/kernel.h>
#include <platform.h>
#include <platform_thread.h>
#include <trace/source_registry.h>

using namespace Genode;

namespace Hw { extern Untyped_capability _main_thread_cap; }


void Thread::start()
{
	/* start thread with stack pointer at the top of stack */
	if (native_thread().platform_thread->start((void *)&_thread_start, stack_top())) {
		error("failed to start thread");
		return;
	}

	struct Trace_source : public  Trace::Source::Info_accessor,
	                      private Trace::Control,
	                      private Trace::Source
	{
		Genode::Thread &thread;

		/**
		 * Trace::Source::Info_accessor interface
		 */
		Info trace_source_info() const override
		{
			Platform_thread * t = thread.native_thread().platform_thread;

			Trace::Execution_time execution_time { 0, 0 };
			if (t)
				execution_time = t->execution_time();

			return { Session_label("core"), thread.name(),
			         execution_time, thread.affinity() };
		}

		Trace_source(Trace::Source_registry &registry, Genode::Thread &thread)
		:
			Trace::Control(),
			Trace::Source(*this, *this),
			thread(thread)
		{
			registry.insert(this);
		}
	};

	/* create trace sources for core threads */
	new (platform().core_mem_alloc()) Trace_source(Trace::sources(), *this);
}


void Thread::cancel_blocking()
{
	native_thread().platform_thread->cancel_blocking();
}


void Thread::_deinit_platform_thread()
{
	/* destruct platform thread */
	destroy(platform().core_mem_alloc(), native_thread().platform_thread);
}


void Thread::_init_platform_thread(size_t, Type type)
{
	if (type == NORMAL) {
		native_thread().platform_thread = new (platform().core_mem_alloc())
			Platform_thread(_stack->name(), _stack->utcb());
		return;
	}

	/* remap initial main-thread UTCB according to stack-area spec */
	Genode::map_local(Platform::core_phys_addr((addr_t)Kernel::Core_thread::singleton().utcb()),
	                  (addr_t)&_stack->utcb(),
	                  max(sizeof(Native_utcb) / get_page_size(), (size_t)1));

	/* adjust initial object state in case of a main thread */
	native_thread().cap = Hw::_main_thread_cap;
}