CLK/Machines/Apple/Macintosh/Macintosh.cpp

//
//  Macintosh.cpp
//  Clock Signal
//
//  Created by Thomas Harte on 03/05/2019.
//  Copyright © 2019 Thomas Harte. All rights reserved.
//

#include "Macintosh.hpp"

#include "Video.hpp"

#include "../../CRTMachine.hpp"

#include "../../../Processors/68000/68000.hpp"
#include "../../../Components/6522/6522.hpp"

#include "../../Utility/MemoryPacker.hpp"

namespace Apple {
namespace Macintosh {

class ConcreteMachine:
	public Machine,
	public CRTMachine::Machine,
	public CPU::MC68000::BusHandler {
	public:
		ConcreteMachine(const ROMMachine::ROMFetcher &rom_fetcher) :
		 	mc68000_(*this),
		 	video_(ram_),
		 	via_(via_port_handler_) {

			// Grab a copy of the ROM and convert it into big-endian data.
			const auto roms = rom_fetcher("Macintosh", { "mac128k.rom" });
			if(!roms[0]) {
				throw ROMMachine::Error::MissingROMs;
			}
			roms[0]->resize(64*1024);
			Memory::PackBigEndian16(*roms[0], rom_);

			// The Mac runs at 7.8336mHz.
			set_clock_rate(7833600.0);
		}

		void set_scan_target(Outputs::Display::ScanTarget *scan_target) override {
			video_.set_scan_target(scan_target);
		}

		Outputs::Speaker::Speaker *get_speaker() override {
			return nullptr;
		}

		void run_for(const Cycles cycles) override {
			mc68000_.run_for(cycles);
		}

		HalfCycles perform_bus_operation(const CPU::MC68000::Microcycle &cycle, int is_supervisor) {
			via_.run_for(cycle.length);

			// TODO: the entirety of dealing with this cycle.

			return HalfCycles(0);
		}

		/*
			Notes to self: accesses to the VIA are via the 68000's
			synchronous bus.
		*/

	private:
		class VIAPortHandler: public MOS::MOS6522::PortHandler {

		};

		CPU::MC68000::Processor<ConcreteMachine, true> mc68000_;
		Video video_;

		MOS::MOS6522::MOS6522<VIAPortHandler> via_;
 		VIAPortHandler via_port_handler_;

		uint16_t rom_[32*1024];
		uint16_t ram_[64*1024];
};

}
}

using namespace Apple::Macintosh;

Machine *Machine::Macintosh(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
	return new ConcreteMachine(rom_fetcher);
}

Machine::~Machine() {}