/*
	This file is part of Fennix Kernel.

	Fennix Kernel is free software: you can redistribute it and/or
	modify it under the terms of the GNU General Public License as
	published by the Free Software Foundation, either version 3 of
	the License, or (at your option) any later version.

	Fennix Kernel is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/

#include <time.hpp>

#include <memory.hpp>
#include <acpi.hpp>
#include <debug.h>
#include <io.h>

#include "../../kernel.h"

namespace Time
{
	bool TimeStampCounter::Sleep(size_t Duration, Units Unit)
	{
#if defined(a86)
		uint64_t Target = this->GetCounter() + (Duration * ConvertUnit(Unit)) / this->clk;
		while (this->GetCounter() < Target)
			CPU::Pause();
		return true;
#endif
	}

	uint64_t TimeStampCounter::GetCounter()
	{
#if defined(a86)
		return CPU::Counter();
#endif
	}

	uint64_t TimeStampCounter::CalculateTarget(uint64_t Target, Units Unit)
	{
#if defined(a86)
		return uint64_t((this->GetCounter() + (Target * ConvertUnit(Unit))) / this->clk);
#endif
	}

	uint64_t TimeStampCounter::GetNanosecondsSinceClassCreation()
	{
#if defined(a86)
		return uint64_t((this->GetCounter() - this->ClassCreationTime) / this->clk);
#endif
	}

	TimeStampCounter::TimeStampCounter()
	{
#if defined(a86)
		stub; // FIXME: This is not a good way to measure the clock speed
		uint64_t Start = CPU::Counter();
		TimeManager->Sleep(1, Units::Milliseconds);
		uint64_t End = CPU::Counter();

		this->clk = End - Start;
		this->ClassCreationTime = this->GetCounter();
#endif
	}

	TimeStampCounter::~TimeStampCounter()
	{
	}
}