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142 lines
4.5 KiB
C++
142 lines
4.5 KiB
C++
//
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// CommodoreAnalyser.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 06/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "StaticAnalyser.hpp"
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#include "File.hpp"
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#include "Tape.hpp"
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#include "Disk.hpp"
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#include "../../Storage/Cartridge/Encodings/CommodoreROM.hpp"
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#include <sstream>
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using namespace StaticAnalyser::Commodore;
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static std::list<std::shared_ptr<Storage::Cartridge::Cartridge>>
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Vic20CartridgesFrom(const std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> &cartridges) {
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std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> vic20_cartridges;
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for(const auto &cartridge : cartridges) {
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const auto &segments = cartridge->get_segments();
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// only one mapped item is allowed
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if(segments.size() != 1) continue;
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// which must be 16 kb in size
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Storage::Cartridge::Cartridge::Segment segment = segments.front();
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if(segment.start_address != 0xa000) continue;
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if(!Storage::Cartridge::Encodings::CommodoreROM::isROM(segment.data)) continue;
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vic20_cartridges.push_back(cartridge);
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}
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return vic20_cartridges;
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}
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void StaticAnalyser::Commodore::AddTargets(const Media &media, std::list<Target> &destination) {
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Target target;
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target.machine = Target::Vic20; // TODO: machine estimation
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target.probability = 1.0; // TODO: a proper estimation
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int device = 0;
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std::list<File> files;
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bool is_disk = false;
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// strip out inappropriate cartridges
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target.media.cartridges = Vic20CartridgesFrom(media.cartridges);
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// check disks
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for(auto &disk : media.disks) {
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std::list<File> disk_files = GetFiles(disk);
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if(!disk_files.empty()) {
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is_disk = true;
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files.splice(files.end(), disk_files);
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target.media.disks.push_back(disk);
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if(!device) device = 8;
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}
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}
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// check tapes
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for(auto &tape : media.tapes) {
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std::list<File> tape_files = GetFiles(tape);
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tape->reset();
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if(!tape_files.empty()) {
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files.splice(files.end(), tape_files);
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target.media.tapes.push_back(tape);
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if(!device) device = 1;
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}
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}
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if(!files.empty()) {
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target.vic20.memory_model = Vic20MemoryModel::Unexpanded;
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std::ostringstream string_stream;
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string_stream << "LOAD\"" << (is_disk ? "*" : "") << "\"," << device << ",";
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if(files.front().is_basic()) {
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string_stream << "0";
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} else {
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string_stream << "1";
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}
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string_stream << "\nRUN\n";
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target.loading_command = string_stream.str();
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// make a first guess based on loading address
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switch(files.front().starting_address) {
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case 0x1001:
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default: break;
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case 0x1201:
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target.vic20.memory_model = Vic20MemoryModel::ThirtyTwoKB;
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break;
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case 0x0401:
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target.vic20.memory_model = Vic20MemoryModel::EightKB;
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break;
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}
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// General approach: increase memory size conservatively such that the largest file found will fit.
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for(File &file : files) {
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std::size_t file_size = file.data.size();
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// bool is_basic = file.is_basic();
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/*if(is_basic)
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{
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// BASIC files may be relocated, so the only limit is size.
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//
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// An unexpanded machine has 3583 bytes free for BASIC;
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// a 3kb expanded machine has 6655 bytes free.
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if(file_size > 6655)
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target.vic20.memory_model = Vic20MemoryModel::ThirtyTwoKB;
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else if(target.vic20.memory_model == Vic20MemoryModel::Unexpanded && file_size > 3583)
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target.vic20.memory_model = Vic20MemoryModel::EightKB;
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}
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else
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{*/
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// if(!file.type == File::NonRelocatableProgram)
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// {
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// Non-BASIC files may be relocatable but, if so, by what logic?
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// Given that this is unknown, take starting address as literal
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// and check against memory windows.
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//
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// (ignoring colour memory...)
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// An unexpanded Vic has memory between 0x0000 and 0x0400; and between 0x1000 and 0x2000.
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// A 3kb expanded Vic fills in the gap and has memory between 0x0000 and 0x2000.
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// A 32kb expanded Vic has memory in the entire low 32kb.
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uint16_t starting_address = file.starting_address;
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// If anything above the 8kb mark is touched, mark as a 32kb machine; otherwise if the
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// region 0x0400 to 0x1000 is touched and this is an unexpanded machine, mark as 3kb.
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if(starting_address + file_size > 0x2000)
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target.vic20.memory_model = Vic20MemoryModel::ThirtyTwoKB;
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else if(target.vic20.memory_model == Vic20MemoryModel::Unexpanded && !(starting_address >= 0x1000 || starting_address+file_size < 0x0400))
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target.vic20.memory_model = Vic20MemoryModel::ThirtyTwoKB;
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// }
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}
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}
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if(!target.media.tapes.empty() || !target.media.cartridges.empty() || !target.media.disks.empty())
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destination.push_back(target);
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}
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