393 lines
12 KiB
C++
393 lines
12 KiB
C++
#ifndef MEM_H
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#define MEM_H
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#include <cstdint>
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#include <iostream>
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#include <string>
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#include <vector>
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#include "app/emu/debug/log.h"
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// LoROM (Mode 20):
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// Banks Offset Purpose
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// 00-3F 0000-1FFF LowRAM (shadowed from 7E)
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// 2000-2FFF PPU1, APU
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// 3000-3FFF SFX, DSP, etc.
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// 4000-41FF Controller
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// 4200-5FFF PPU2, DMA, etc.
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// 6000-7FFF Expansion RAM (reserved)
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// 8000-FFFF 32k ROM Chunk
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// 40-7C 0000-7FFF 32k ROM Chunk
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// 8000-FFFF 32k ROM Chunk
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// 7D 0000-FFFF SRAM
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// 7E 0000-1FFF LowRAM
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// 2000-FFFF System RAM
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// 7F 0000-FFFF System RAM
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namespace yaze {
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namespace app {
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namespace emu {
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enum ROMSpeed { SLOW_ROM = 0x00, FAST_ROM = 0x07 };
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enum BankSize { LOW_ROM = 0x00, HI_ROM = 0x01 };
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enum ROMType {
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ROM_DEFAULT = 0x00,
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ROM_RAM = 0x01,
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ROM_SRAM = 0x02,
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ROM_DSP1 = 0x03,
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ROM_DSP1_RAM = 0x04,
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ROM_DSP1_SRAM = 0x05,
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FX = 0x06
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};
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enum ROMSize {
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SIZE_2_MBIT = 0x08,
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SIZE_4_MBIT = 0x09,
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SIZE_8_MBIT = 0x0A,
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SIZE_16_MBIT = 0x0B,
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SIZE_32_MBIT = 0x0C
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};
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enum SRAMSize {
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NO_SRAM = 0x00,
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SRAM_16_KBIT = 0x01,
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SRAM_32_KBIT = 0x02,
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SRAM_64_KBIT = 0x03
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};
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enum CountryCode {
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JAPAN = 0x00,
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USA = 0x01,
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EUROPE_OCEANIA_ASIA = 0x02,
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// ... and other countries
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};
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enum License {
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INVALID = 0,
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NINTENDO = 1,
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ZAMUSE = 5,
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CAPCOM = 8,
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// ... and other licenses
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};
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class ROMInfo {
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public:
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std::string title;
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ROMSpeed romSpeed;
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BankSize bankSize;
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ROMType romType;
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ROMSize romSize;
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SRAMSize sramSize;
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CountryCode countryCode;
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License license;
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uint8_t version;
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uint16_t checksumComplement;
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uint16_t checksum;
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uint16_t nmiVblVector;
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uint16_t resetVector;
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};
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class Observer {
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public:
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virtual ~Observer() = default;
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virtual void Notify(uint32_t address, uint8_t data) = 0;
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};
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constexpr uint32_t kROMStart = 0x008000;
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constexpr uint32_t kROMSize = 0x200000;
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constexpr uint32_t kRAMStart = 0x7E0000;
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constexpr uint32_t kRAMSize = 0x20000;
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constexpr uint32_t kVRAMStart = 0x210000;
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constexpr uint32_t kVRAMSize = 0x10000;
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constexpr uint32_t kOAMStart = 0x218000;
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constexpr uint32_t kOAMSize = 0x220;
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// memory.h
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class Memory {
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public:
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virtual ~Memory() = default;
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virtual uint8_t ReadByte(uint32_t address) const = 0;
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virtual uint16_t ReadWord(uint32_t address) const = 0;
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virtual uint32_t ReadWordLong(uint32_t address) const = 0;
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virtual std::vector<uint8_t> ReadByteVector(uint32_t address,
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uint16_t length) const = 0;
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virtual void WriteByte(uint32_t address, uint8_t value) = 0;
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virtual void WriteWord(uint32_t address, uint16_t value) = 0;
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virtual void PushByte(uint8_t value) = 0;
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virtual uint8_t PopByte() = 0;
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virtual void PushWord(uint16_t value) = 0;
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virtual uint16_t PopWord() = 0;
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virtual void PushLong(uint32_t value) = 0;
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virtual uint32_t PopLong() = 0;
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virtual uint16_t SP() const = 0;
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virtual void SetSP(uint16_t value) = 0;
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virtual void ClearMemory() = 0;
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virtual uint8_t operator[](int i) const = 0;
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virtual uint8_t at(int i) const = 0;
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};
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enum class MemoryMapping { SNES_LOROM = 0, PC_ADDRESS = 1 };
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class MemoryImpl : public Memory, public Loggable {
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public:
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void Initialize(const std::vector<uint8_t>& romData,
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MemoryMapping mapping = MemoryMapping::SNES_LOROM) {
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mapping_ = mapping;
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if (mapping == MemoryMapping::PC_ADDRESS) {
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memory_.resize(romData.size());
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std::copy(romData.begin(), romData.end(), memory_.begin());
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return;
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}
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memory_.resize(0x1000000); // 16 MB
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const size_t ROM_CHUNK_SIZE = 0x8000; // 32 KB
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const size_t SRAM_SIZE = 0x10000; // 64 KB
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const size_t SYSTEM_RAM_SIZE = 0x20000; // 128 KB
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const size_t EXPANSION_RAM_SIZE = 0x2000; // 8 KB
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const size_t HARDWARE_REGISTERS_SIZE = 0x4000; // 16 KB
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// Clear memory
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std::fill(memory_.begin(), memory_.end(), 0);
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// Load ROM data into memory based on LoROM mapping
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size_t romSize = romData.size();
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size_t romAddress = 0;
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for (size_t bank = 0x00; bank <= 0x3F; ++bank) {
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for (size_t offset = 0x8000; offset <= 0xFFFF; offset += ROM_CHUNK_SIZE) {
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if (romAddress < romSize) {
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std::copy(romData.begin() + romAddress,
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romData.begin() + romAddress + ROM_CHUNK_SIZE,
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memory_.begin() + (bank << 16) + offset);
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romAddress += ROM_CHUNK_SIZE;
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}
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}
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}
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// Initialize SRAM at banks 0x7D and 0xFD
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std::fill(memory_.begin() + (0x7D << 16), memory_.begin() + (0x7E << 16),
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0);
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std::fill(memory_.begin() + (0xFD << 16), memory_.begin() + (0xFE << 16),
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0);
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// Initialize System RAM at banks 0x7E and 0x7F
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std::fill(memory_.begin() + (0x7E << 16),
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memory_.begin() + (0x7E << 16) + SYSTEM_RAM_SIZE, 0);
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// Initialize Shadow RAM at banks 0x00-0x3F and 0x80-0xBF
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for (size_t bank = 0x00; bank <= 0xBF; bank += 0x80) {
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std::fill(memory_.begin() + (bank << 16),
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memory_.begin() + (bank << 16) + 0x2000, 0);
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}
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// Initialize Hardware Registers at banks 0x00-0x3F and 0x80-0xBF
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for (size_t bank = 0x00; bank <= 0xBF; bank += 0x80) {
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std::fill(
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memory_.begin() + (bank << 16) + 0x2000,
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memory_.begin() + (bank << 16) + 0x2000 + HARDWARE_REGISTERS_SIZE, 0);
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}
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// Initialize Expansion RAM at banks 0x00-0x3F and 0x80-0xBF
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for (size_t bank = 0x00; bank <= 0xBF; bank += 0x80) {
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std::fill(memory_.begin() + (bank << 16) + 0x6000,
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memory_.begin() + (bank << 16) + 0x6000 + EXPANSION_RAM_SIZE,
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0);
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}
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// Initialize Reset and NMI Vectors at bank 0xFF
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std::fill(memory_.begin() + (0xFF << 16) + 0xFF00,
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memory_.begin() + (0xFF << 16) + 0xFFFF + 1, 0);
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// Copy data into rom_ vector
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rom_.resize(kROMSize);
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std::copy(memory_.begin() + kROMStart,
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memory_.begin() + kROMStart + kROMSize, rom_.begin());
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// Copy data into ram_ vector
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ram_.resize(kRAMSize);
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std::copy(memory_.begin() + kRAMStart,
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memory_.begin() + kRAMStart + kRAMSize, ram_.begin());
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// Copy data into vram_ vector
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vram_.resize(kVRAMSize);
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std::copy(memory_.begin() + kVRAMStart,
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memory_.begin() + kVRAMStart + kVRAMSize, vram_.begin());
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// Copy data into oam_ vector
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oam_.resize(kOAMSize);
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std::copy(memory_.begin() + kOAMStart,
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memory_.begin() + kOAMStart + kOAMSize, oam_.begin());
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}
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uint8_t ReadByte(uint32_t address) const override {
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uint32_t mapped_address = GetMappedAddress(address);
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NotifyObservers(mapped_address, /*data=*/0);
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return memory_.at(mapped_address);
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}
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uint16_t ReadWord(uint32_t address) const override {
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uint32_t mapped_address = GetMappedAddress(address);
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NotifyObservers(mapped_address, /*data=*/0);
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return static_cast<uint16_t>(memory_.at(mapped_address)) |
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(static_cast<uint16_t>(memory_.at(mapped_address + 1)) << 8);
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}
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uint32_t ReadWordLong(uint32_t address) const override {
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uint32_t mapped_address = GetMappedAddress(address);
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NotifyObservers(mapped_address, /*data=*/0);
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return static_cast<uint32_t>(memory_.at(mapped_address)) |
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(static_cast<uint32_t>(memory_.at(mapped_address + 1)) << 8) |
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(static_cast<uint32_t>(memory_.at(mapped_address + 2)) << 16);
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}
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std::vector<uint8_t> ReadByteVector(uint32_t address,
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uint16_t length) const override {
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uint32_t mapped_address = GetMappedAddress(address);
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NotifyObservers(mapped_address, /*data=*/0);
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return std::vector<uint8_t>(memory_.begin() + mapped_address,
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memory_.begin() + mapped_address + length);
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}
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void WriteByte(uint32_t address, uint8_t value) override {
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uint32_t mapped_address = GetMappedAddress(address);
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memory_[mapped_address] = value;
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}
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void WriteWord(uint32_t address, uint16_t value) override {
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uint32_t mapped_address = GetMappedAddress(address);
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memory_.at(mapped_address) = value & 0xFF;
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memory_.at(mapped_address + 1) = (value >> 8) & 0xFF;
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}
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// Stack operations
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void PushByte(uint8_t value) override {
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if (SP_ > 0x0100) {
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memory_.at(SP_--) = value;
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} else {
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// Handle stack underflow
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std::cout << "Stack underflow!" << std::endl;
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throw std::runtime_error("Stack underflow!");
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}
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}
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uint8_t PopByte() override {
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if (SP_ < 0x1FF) {
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return memory_.at(++SP_);
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} else {
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// Handle stack overflow
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std::cout << "Stack overflow!" << std::endl;
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throw std::runtime_error("Stack overflow!");
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}
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}
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void PushWord(uint16_t value) override {
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PushByte(value >> 8);
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PushByte(value & 0xFF);
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}
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uint16_t PopWord() override {
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uint8_t low = PopByte();
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uint8_t high = PopByte();
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return (static_cast<uint16_t>(high) << 8) | low;
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}
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void PushLong(uint32_t value) override {
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PushByte(value >> 16);
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PushByte(value >> 8);
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PushByte(value & 0xFF);
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}
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uint32_t PopLong() override {
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uint8_t low = PopByte();
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uint8_t mid = PopByte();
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uint8_t high = PopByte();
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return (static_cast<uint32_t>(high) << 16) |
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(static_cast<uint32_t>(mid) << 8) | low;
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}
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void AddObserver(Observer* observer) { observers_.push_back(observer); }
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// Stack Pointer access.
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uint16_t SP() const override { return SP_; }
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void SetSP(uint16_t value) override { SP_ = value; }
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void ClearMemory() override { std::fill(memory_.begin(), memory_.end(), 0); }
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uint8_t at(int i) const override { return memory_[i]; }
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uint8_t operator[](int i) const override {
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if (i > memory_.size()) {
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std::cout << i << " out of bounds \n";
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return memory_[0];
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}
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return memory_[i];
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}
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auto size() const { return memory_.size(); }
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auto begin() const { return memory_.begin(); }
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auto end() const { return memory_.end(); }
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auto data() const { return memory_.data(); }
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// Define memory regions
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std::vector<uint8_t> rom_;
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std::vector<uint8_t> ram_;
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std::vector<uint8_t> vram_;
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std::vector<uint8_t> oam_;
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private:
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uint32_t GetMappedAddress(uint32_t address) const {
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uint32_t bank = address >> 16;
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uint32_t offset = address & 0xFFFF;
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if (mapping_ == MemoryMapping::PC_ADDRESS) {
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return address;
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}
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if (bank <= 0x3F) {
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if (offset <= 0x1FFF) {
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return offset; // Shadow RAM
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} else if (offset <= 0x5FFF) {
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return offset - 0x2000 + 0x2000; // Hardware Registers
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} else if (offset <= 0x7FFF) {
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return offset - 0x6000 + 0x6000; // Expansion RAM
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} else {
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// Return lorom mapping
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return (bank << 16) + (offset - 0x8000) + 0x8000; // ROM
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}
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} else if (bank == 0x7D) {
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return offset + 0x7D0000; // SRAM
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} else if (bank == 0x7E || bank == 0x7F) {
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return offset + 0x7E0000; // System RAM
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} else if (bank >= 0x80) {
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// Handle HiROM and mirrored areas
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}
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return address; // Return the original address if no mapping is defined
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}
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void NotifyObservers(uint32_t address, uint8_t data) const {
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for (auto observer : observers_) {
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observer->Notify(address, data);
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}
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}
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std::vector<Observer*> observers_;
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// Memory (64KB)
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std::vector<uint8_t> memory_;
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// Stack Pointer
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uint16_t SP_ = 0x01FF;
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MemoryMapping mapping_ = MemoryMapping::SNES_LOROM;
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};
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void DrawSnesMemoryMapping(const MemoryImpl& memory);
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} // namespace emu
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} // namespace app
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} // namespace yaze
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#endif // MEM_H
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