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123 lines
3.6 KiB
Plaintext
123 lines
3.6 KiB
Plaintext
//
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// EmuTOSTests.m
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// Clock SignalTests
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//
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// Created by Thomas Harte on 10/03/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#import <XCTest/XCTest.h>
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#include <array>
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#include <cassert>
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//#define LOG_TRACE
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#include "68000Mk2.hpp"
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#include "Comparative68000.hpp"
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#include "CSROMFetcher.hpp"
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class EmuTOS: public ComparativeBusHandler {
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public:
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EmuTOS(const std::vector<uint8_t> &emuTOS, const char *trace_name) : ComparativeBusHandler(trace_name), m68000_(*this) {
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assert(!(emuTOS.size() & 1));
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emuTOS_.resize(emuTOS.size() / 2);
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for(size_t c = 0; c < emuTOS_.size(); ++c) {
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emuTOS_[c] = (emuTOS[c << 1] << 8) | emuTOS[(c << 1) + 1];
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}
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}
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void run_for(HalfCycles cycles) {
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m68000_.run_for(cycles);
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}
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CPU::MC68000Mk2::State get_state() final {
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return m68000_.get_state();
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}
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HalfCycles perform_bus_operation(const CPU::MC68000Mk2::Microcycle &cycle, int) {
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const uint32_t address = cycle.word_address();
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uint32_t word_address = address;
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// As much about the Atari ST's memory map as is relevant here: the ROM begins
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// at 0xfc0000, and the first eight bytes are mirrored to the first four memory
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// addresses in order for /RESET to work properly. RAM otherwise fills the first
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// 512kb of the address space. Trying to write to ROM raises a bus error.
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const bool is_rom = (word_address >= (0xfc0000 >> 1) && word_address < (0xff0000 >> 1)) || word_address < 4;
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const bool is_ram = word_address < ram_.size();
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const bool is_peripheral = !is_rom && !is_ram;
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uint16_t *const base = is_rom ? emuTOS_.data() : ram_.data();
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if(is_rom) {
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word_address %= emuTOS_.size();
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} else {
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word_address %= ram_.size();
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}
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using Microcycle = CPU::MC68000Mk2::Microcycle;
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if(cycle.data_select_active()) {
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uint16_t peripheral_result = 0xffff;
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if(is_peripheral) {
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switch(address & 0x7ff) {
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// A hard-coded value for TIMER B.
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case (0xa21 >> 1):
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peripheral_result = 0x00000001;
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break;
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}
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}
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switch(cycle.operation & (Microcycle::SelectWord | Microcycle::SelectByte | Microcycle::Read)) {
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default: break;
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case Microcycle::SelectWord | Microcycle::Read:
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cycle.value->w = is_peripheral ? peripheral_result : base[word_address];
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break;
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case Microcycle::SelectByte | Microcycle::Read:
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cycle.value->b = (is_peripheral ? peripheral_result : base[word_address]) >> cycle.byte_shift();
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break;
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case Microcycle::SelectWord:
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base[word_address] = cycle.value->w;
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break;
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case Microcycle::SelectByte:
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base[word_address] = (cycle.value->b << cycle.byte_shift()) | (base[word_address] & (0xffff ^ cycle.byte_mask()));
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break;
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}
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}
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return HalfCycles(0);
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}
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private:
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CPU::MC68000Mk2::Processor<EmuTOS, true, true> m68000_;
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std::vector<uint16_t> emuTOS_;
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std::array<uint16_t, 256*1024> ram_;
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};
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@interface EmuTOSTests : XCTestCase
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@end
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@implementation EmuTOSTests {
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std::unique_ptr<EmuTOS> _machine;
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}
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- (void)testImage:(ROM::Name)name trace:(NSString *)trace length:(int)length {
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const auto roms = CSROMFetcher()(ROM::Request(name));
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NSString *const traceLocation = [[NSBundle bundleForClass:[self class]] pathForResource:trace ofType:@"trace.txt.gz"];
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_machine = std::make_unique<EmuTOS>(roms.find(name)->second, traceLocation.fileSystemRepresentation);
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_machine->run_for(HalfCycles(length));
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}
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- (void)testEmuTOSStartup {
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[self testImage:ROM::Name::AtariSTEmuTOS192 trace:@"etos192uk" length:313490];
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// TODO: assert that machine is now STOPped.
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}
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- (void)testTOSStartup {
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[self testImage:ROM::Name::AtariSTTOS100 trace:@"tos100" length:54011091];
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}
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@end
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