/*
	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 <power.hpp>

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

#include "../kernel.h"

namespace Power
{
	void Power::Reboot()
	{
		if (((ACPI::ACPI *)this->acpi)->FADT)
			if (((ACPI::DSDT *)this->dsdt)->ACPIShutdownSupported)
				((ACPI::DSDT *)this->dsdt)->Reboot();

#if defined(__amd64__) || defined(__i386__)
		asmv("cli");
		uint8_t temp;
		do
		{
			temp = inb(0x64);
			if (((temp) & (1 << (0))) != 0)
				inb(0x60);
		} while (((temp) & (1 << (1))) != 0);
		outb(0x64, 0xFE);
#elif defined(__aarch64__)
		warn("aarch64 is not supported yet");
#endif
	}

	void Power::Shutdown()
	{
		if (((ACPI::ACPI *)this->acpi)->FADT)
		{
			if (((ACPI::DSDT *)this->dsdt)->ACPIShutdownSupported)
				((ACPI::DSDT *)this->dsdt)->Shutdown();
			else
				KPrint("Shutdown not supported");
			/* TODO: If no ACPI, display "It is now safe to turn off your computer"? */
		}
		/* FIXME: Detect emulators and use their shutdown methods */
#ifdef DEBUG
#if defined(__amd64__) || defined(__i386__)
		outl(0xB004, 0x2000); // for qemu
		outl(0x604, 0x2000);  // if qemu not working, bochs and older versions of qemu
		outl(0x4004, 0x3400); // virtual box
#endif
#endif
	}

	void Power::InitDSDT()
	{
		if (((ACPI::ACPI *)this->acpi)->FADT)
			this->dsdt = new ACPI::DSDT((ACPI::ACPI *)acpi);
	}

	Power::Power()
	{
		this->acpi = new ACPI::ACPI;
		this->madt = new ACPI::MADT(((ACPI::ACPI *)acpi)->MADT);
		trace("Power manager initialized");
	}
}
