// vim: set noet ts=4 sw=4:

#include "thread.h"
#include "../arch/core_ring.h"

#include "../debug/kernelpanic.h"
#include "../interrupt/guard.h"
#include "debug/output.h"

// counter for ID
static size_t idCounter = 1;

void Thread::kickoff(uintptr_t param1, uintptr_t param2, uintptr_t param3) {
	Thread *thread = reinterpret_cast<Thread *>(param1);
	assert(thread != nullptr && "Kickoff got nullptr pointer to Thread");
	(void)param2;  // will be used later
	(void)param3;  // will be used later
	// The core must have entered level 1/2 to cause a thread to be scheduled.
	Guard::leave();

	if(!thread->isKernel)
		Core::Ring::switchToUsermode(thread->StackPointer.user, reinterpret_cast<void*>(kickoffUsermode), thread);
	else
		if(thread->start == nullptr)
			thread->action();
		else
			((void(*)())thread->start)();

}

void Thread::kickoffUsermode (Thread *object){
	if(object->start == nullptr)
		object->action();
	else
		((void(*)())object->start)();
}

Thread::Thread 	(bool kernel, void * start): queue_link(nullptr), isKernel(kernel), start(start), id(idCounter++), kill_flag(false){
	StackPointer.isr = reinterpret_cast<void *>(reserved_stack_space_isr + STACK_SIZE);
	StackPointer.user = reinterpret_cast<void *>(reserved_stack_space_user + STACK_SIZE);
	prepareContext(StackPointer.isr, context, kickoff, reinterpret_cast<uintptr_t>(this), 0, 0);
}

Thread::Thread() : Thread(false, 0) {}
//Thread::Thread() : queue_link(nullptr), id(idCounter++), kill_flag(false) {
//	void *tos = reinterpret_cast<void *>(reserved_stack_space_isr + STACK_SIZE);
//	prepareContext(tos, context, kickoff, reinterpret_cast<uintptr_t>(this), 0, 0);
//}

void Thread::resume(Thread *next) {
	assert(next != nullptr && "Pointer to next Thread must not be nullptr!");
	context_switch(&next->context, &context);
}

void Thread::go() { context_launch(&context); }

void Thread::action() { kernelpanic("Wrong entry / missing action in Thread"); }