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128 lines
4.2 KiB
Plaintext
128 lines
4.2 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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#include "68000.hpp"
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#include "CSROMFetcher.hpp"
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class EmuTOS: public CPU::MC68000::BusHandler {
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public:
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EmuTOS(const std::vector<uint8_t> &emuTOS) : 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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HalfCycles perform_bus_operation(const CPU::MC68000::Microcycle &cycle, int is_supervisor) {
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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_peripheral = word_address > (0xff0000 >> 1);
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const bool is_rom = word_address > (0xfc0000 >> 1) || word_address < 4;
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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 &= 0xffff;
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} else {
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word_address &= 0x3ffff;
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}
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using Microcycle = CPU::MC68000::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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// printf("Peripheral: %c %08x", (cycle.operation & Microcycle::Read) ? 'r' : 'w', *cycle.address);
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// if(!(cycle.operation & Microcycle::Read)) {
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// if(cycle.operation & Microcycle::SelectByte)
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// printf(" %02x", cycle.value->halves.low);
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// else
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// printf(" %04x", cycle.value->full);
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// }
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// printf("\n");
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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->full = is_peripheral ? peripheral_result : base[word_address];
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// if(!(cycle.operation & Microcycle::IsProgram)) printf("[word r %08x -> %04x] ", *cycle.address, cycle.value->full);
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break;
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case Microcycle::SelectByte | Microcycle::Read:
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cycle.value->halves.low = (is_peripheral ? peripheral_result : base[word_address]) >> cycle.byte_shift();
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// if(!(cycle.operation & Microcycle::IsProgram)) printf("[byte r %08x -> %02x] ", *cycle.address, cycle.value->halves.low);
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break;
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case Microcycle::SelectWord:
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assert(!(is_rom && !is_peripheral));
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// if(!(cycle.operation & Microcycle::IsProgram)) printf("[word w %04x -> %08x] ", cycle.value->full, *cycle.address);
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base[word_address] = cycle.value->full;
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break;
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case Microcycle::SelectByte:
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assert(!(is_rom && !is_peripheral));
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// if(!(cycle.operation & Microcycle::IsProgram)) printf("[byte w %02x -> %08x] ", cycle.value->halves.low, *cycle.address);
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base[word_address] = (cycle.value->halves.low << 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::MC68000::Processor<EmuTOS, 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)setUp {
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// Put setup code here. This method is called before the invocation of each test method in the class.
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const auto roms = CSROMFetcher()("AtariST", {"tos100.img"});
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_machine.reset(new EmuTOS(*roms[0]));
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}
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- (void)tearDown {
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// Put teardown code here. This method is called after the invocation of each test method in the class.
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}
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- (void)testStartup {
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// This is an example of a functional test case.
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// Use XCTAssert and related functions to verify your tests produce the correct results.
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_machine->run_for(HalfCycles(8000000));
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}
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@end
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