integration of n64 core

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "external/toml11"]
-	path = external/toml11
-	url = https://github.com/ToruNiina/toml11

CMakeLists.txt

@@ -6,4 +6,5 @@ set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
 
 add_subdirectory(src)
 add_executable(natsukashii src/main.cpp)
+target_include_directories(natsukashii PUBLIC src/frontend/)
 target_link_libraries(natsukashii cores frontend)

external/CMakeLists.txt

@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.20)
+
+include_directories(.)

external/portable_endian_bswap.h

@@ -0,0 +1,177 @@
+// "License": Public Domain
+// I, Mathias Panzenböck, place this file hereby into the public domain. Use it at your own risk for whatever you like.
+// In case there are jurisdictions that don't support putting things in the public domain you can also consider it to
+// be "dual licensed" under the BSD, MIT and Apache licenses, if you want to. This code is trivial anyway. Consider it
+// an example on how to get the endian conversion functions on different platforms.
+
+#pragma once
+
+#if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && !defined(__WINDOWS__)
+
+#	define __WINDOWS__
+
+#endif
+
+#if defined(__linux__) || defined(__CYGWIN__)
+
+#	include <endian.h>
+
+#elif defined(__APPLE__)
+
+#	include <libkern/OSByteOrder.h>
+
+#	define htobe16(x) OSSwapHostToBigInt16(x)
+#	define htole16(x) OSSwapHostToLittleInt16(x)
+#	define be16toh(x) OSSwapBigToHostInt16(x)
+#	define le16toh(x) OSSwapLittleToHostInt16(x)
+ 
+#	define htobe32(x) OSSwapHostToBigInt32(x)
+#	define htole32(x) OSSwapHostToLittleInt32(x)
+#	define be32toh(x) OSSwapBigToHostInt32(x)
+#	define le32toh(x) OSSwapLittleToHostInt32(x)
+ 
+#	define htobe64(x) OSSwapHostToBigInt64(x)
+#	define htole64(x) OSSwapHostToLittleInt64(x)
+#	define be64toh(x) OSSwapBigToHostInt64(x)
+#	define le64toh(x) OSSwapLittleToHostInt64(x)
+
+#	define __BYTE_ORDER    BYTE_ORDER
+#	define __BIG_ENDIAN    BIG_ENDIAN
+#	define __LITTLE_ENDIAN LITTLE_ENDIAN
+#	define __PDP_ENDIAN    PDP_ENDIAN
+
+#elif defined(__OpenBSD__)
+
+#	include <sys/endian.h>
+
+#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
+
+#	include <sys/endian.h>
+
+#	define be16toh(x) betoh16(x)
+#	define le16toh(x) letoh16(x)
+
+#	define be32toh(x) betoh32(x)
+#	define le32toh(x) letoh32(x)
+
+#	define be64toh(x) betoh64(x)
+#	define le64toh(x) letoh64(x)
+
+#elif defined(__WINDOWS__)
+
+#	include <winsock2.h>
+#	include <sys/param.h>
+
+#	if BYTE_ORDER == LITTLE_ENDIAN
+
+#		define htobe16(x) htons(x)
+#		define htole16(x) (x)
+#		define be16toh(x) ntohs(x)
+#		define le16toh(x) (x)
+ 
+#		define htobe32(x) htonl(x)
+#		define htole32(x) (x)
+#		define be32toh(x) ntohl(x)
+#		define le32toh(x) (x)
+ 
+#		define htobe64(x) htonll(x)
+#		define htole64(x) (x)
+#		define be64toh(x) ntohll(x)
+#		define le64toh(x) (x)
+
+#	elif BYTE_ORDER == BIG_ENDIAN
+
+		/* that would be xbox 360 */
+#		define htobe16(x) (x)
+#		define htole16(x) __builtin_bswap16(x)
+#		define be16toh(x) (x)
+#		define le16toh(x) __builtin_bswap16(x)
+ 
+#		define htobe32(x) (x)
+#		define htole32(x) __builtin_bswap32(x)
+#		define be32toh(x) (x)
+#		define le32toh(x) __builtin_bswap32(x)
+ 
+#		define htobe64(x) (x)
+#		define htole64(x) __builtin_bswap64(x)
+#		define be64toh(x) (x)
+#		define le64toh(x) __builtin_bswap64(x)
+
+#	else
+
+#		error byte order not supported
+
+#	endif
+
+#	define __BYTE_ORDER    BYTE_ORDER
+#	define __BIG_ENDIAN    BIG_ENDIAN
+#	define __LITTLE_ENDIAN LITTLE_ENDIAN
+#	define __PDP_ENDIAN    PDP_ENDIAN
+
+#else
+
+#	error platform not supported
+
+#endif
+
+// Adapted from Google's CityHash source code:
+//
+// https://github.com/google/cityhash/blob/8af9b8c2b889d80c22d6bc26ba0df1afb79a30db/src/city.cc#L50
+
+#if defined(_MSC_VER)
+
+#include <stdlib.h>
+#define bswap_16(x) _byteswap_ushort(x)
+#define bswap_32(x) _byteswap_ulong(x)
+#define bswap_64(x) _byteswap_uint64(x)
+
+#elif defined(__APPLE__)
+
+// Mac OS X / Darwin features
+#include <libkern/OSByteOrder.h>
+#define bswap_16(x) OSSwapInt16(x)
+#define bswap_32(x) OSSwapInt32(x)
+#define bswap_64(x) OSSwapInt64(x)
+
+#elif defined(__sun) || defined(sun)
+
+#include <sys/byteorder.h>
+#define bswap_16(x) BSWAP_16(x)
+#define bswap_32(x) BSWAP_32(x)
+#define bswap_64(x) BSWAP_64(x)
+
+#elif defined(__FreeBSD__)
+
+#include <sys/endian.h>
+#define bswap_16(x) bswap16(x)
+#define bswap_32(x) bswap32(x)
+#define bswap_64(x) bswap64(x)
+
+#elif defined(__OpenBSD__)
+
+#include <sys/types.h>
+#define bswap_16(x) swap16(x)
+#define bswap_32(x) swap32(x)
+#define bswap_64(x) swap64(x)
+
+#elif defined(__NetBSD__)
+
+#include <sys/types.h>
+#include <machine/bswap.h>
+#if defined(__BSWAP_RENAME) && !defined(__bswap_32)
+#define bswap_16(x) bswap16(x)
+#define bswap_32(x) bswap32(x)
+#define bswap_64(x) bswap64(x)
+#endif
+
+#elif __has_builtin(__builtin_bswap16) && __has_builtin(__builtin_bswap32) && __has_builtin(__builtin_bswap64)
+
+#define bswap_16(x) __builtin_bswap16(x)
+#define bswap_32(x) __builtin_bswap32(x)
+#define bswap_64(x) __builtin_bswap64(x)
+
+#else
+
+#include <byteswap.h>
+
+#endif

src/core/BaseCore.hpp

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace natsukashii::core {
+struct BaseCore {
+  virtual void Run() {}
+};
+}

src/core/CMakeLists.txt

@@ -5,9 +5,13 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 add_subdirectory(gb)
+add_subdirectory(n64)
+
 add_library(cores
   Scheduler.cpp
   Scheduler.hpp
-  common.hpp)
-target_include_directories(cores PUBLIC .)
-target_link_libraries(cores PUBLIC gb)
+  common.hpp
+  BaseCore.hpp)
+target_include_directories(cores PRIVATE .)
+target_include_directories(cores PUBLIC ../../external)
+target_link_libraries(cores PUBLIC gb n64)

src/core/gb/CMakeLists.txt

@@ -5,7 +5,8 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 find_package(mio REQUIRED)
 find_package(fmt REQUIRED)
+find_package(toml11 REQUIRED)
 
 add_library(gb Core.hpp Core.cpp Cpu.hpp Cpu.cpp Ppu.hpp Ppu.cpp Mem.cpp Mem.hpp mbc.cpp mbc.hpp memory_regions.hpp)
-target_include_directories(gb PUBLIC . ..)
-target_link_libraries(gb PUBLIC mio::mio fmt::fmt)
+target_include_directories(gb PRIVATE . ..)
+target_link_libraries(gb PUBLIC toml11::toml11 mio::mio fmt::fmt)

src/core/gb/Core.cpp

@@ -1,7 +1,9 @@
 #include <Core.hpp>
 
-namespace natsukashii::core {
-Core::Core() {}
+namespace natsukashii::gb::core {
+Core::Core(const std::string& rom) {
+  mem.LoadROM(rom);
+}
 
 void Core::Run() {
   while(true) {

src/core/gb/Core.hpp

@@ -1,12 +1,13 @@
 #pragma once
-#include "Cpu.hpp"
-#include "Ppu.hpp"
-#include "Mem.hpp"
+#include <Cpu.hpp>
+#include <Ppu.hpp>
+#include <Mem.hpp>
+#include <BaseCore.hpp>
 
-namespace natsukashii::core {
-struct Core {
-  Core();
-  void Run();
+namespace natsukashii::gb::core {
+struct Core : natsukashii::core::BaseCore {
+  Core(const std::string&);
+  void Run() override;
 private:
   Mem mem;
   Cpu cpu;

src/core/gb/Cpu.cpp

@@ -1,18 +1,30 @@
 #include <Cpu.hpp>
 #include <util.hpp>
 
-namespace natsukashii::core {
-Cpu::Cpu() {
-}
+namespace natsukashii::gb::core {
+Cpu::Cpu() {}
 
 void Cpu::Step(Mem& mem) {
-  u8 opcode = mem.Consume<u8>(pc);
-  DecodeAndExecute(opcode);
+  FetchDecodeExecute(mem);
 }
 
-void Cpu::DecodeAndExecute(u8 opcode) {
+void Cpu::FetchDecodeExecute(Mem& mem) {
+  u8 opcode = mem.Read8(regs.pc);
   switch(opcode) {
-    default: util::panic("Unimplemented opcode %02X", opcode);
+    case 0x01: case 0x11: case 0x21: case 0x31: // LD r16, u16
+      SetR16<1>((opcode >> 4) & 3, mem.Consume16(regs.pc));
+      break;
+    case 0xA8 ... 0xAF: // XOR A, r8
+      regs.a() ^= GetR8(opcode & 7, mem);
+      regs.f().set(regs.a() == 0, false, false, false);
+      break;
+    case 0x02: case 0x12: case 0x22: case 0x32: {
+      u8 bits = (opcode >> 4) & 3;
+      mem.Write8(GetR16<2>(bits), regs.a());
+    } break;
+    default: util::panic("Unimplemented opcode {:02X}, pc: {:04X}", opcode, regs.pc);
   }
+
+  regs.pc++;
 }
 }

src/core/gb/Cpu.hpp

@@ -1,23 +1,8 @@
 #pragma once
-#include "Mem.hpp"
-
-namespace natsukashii::core {
-#define af regs.AF
-#define bc regs.BC
-#define de regs.DE
-#define hl regs.HL
-#define pc regs.PC
-#define sp regs.SP
-
-#define a af.A
-#define f af.F
-#define b bc.B
-#define c bc.C
-#define d de.D
-#define e de.E
-#define h hl.H
-#define l hl.L
+#include <Mem.hpp>
+#include <util.hpp>
 
+namespace natsukashii::gb::core {
 #define REGIMPL(type1, reg1, type2, reg2) \
   struct reg##reg1##reg2 { \
     reg##reg1##reg2() {} \
@@ -26,17 +11,11 @@ namespace natsukashii::core {
       type2 reg2; \
     }; \
     u16 raw = 0; \
-    reg##reg1##reg2& operator=(const u16& rhs) { \
-      reg1 = rhs >> 8; \
-      reg2 = rhs & 0xff; \
-      return *this; \
-    } \
   } reg1##reg2
 
 struct RegF {
   RegF() : raw(0) {}
   RegF(const u8& val) : raw(val) {}
-  u8 raw = 0;
 
   RegF& operator=(const u8& rhs) {
     raw |= ((rhs >> 7) << 7);
@@ -52,6 +31,24 @@ struct RegF {
   bool halfcarry() { return (raw >> 5) & 1; }
   bool carry() { return (raw >> 4) & 1; }
 
+  void reset() {
+    zero(false);
+    negative(false);
+    halfcarry(false);
+    carry(false);
+  }
+
+  void set(bool z, bool n, bool hc, bool ca) {
+    zero(z);
+    negative(n);
+    halfcarry(hc);
+    carry(ca);
+  }
+
+  u8& get() { return raw; }
+private:
+  u8 raw = 0;
+
   void zero(const bool& rhs) {
     raw &= ~0xF;
     raw |= (rhs << 7);
@@ -76,16 +73,111 @@ struct RegF {
 struct Registers {
   REGIMPL(u8, A, RegF, F);
   REGIMPL(u8, B, u8, C);
-  REGIMPL(u8, C, u8, E);
-  REGIMPL(u8, D, u8, L);
-  u16 PC = 0, SP = 0;
+  REGIMPL(u8, D, u8, E);
+  REGIMPL(u8, H, u8, L);
+  u16 pc = 0, sp = 0;
+
+  u8& a() { return AF.A; }
+  RegF& f() { return AF.F; }
+  u8& b() { return BC.B; }
+  u8& c() { return BC.C; }
+  u8& d() { return DE.D; }
+  u8& e() { return DE.E; }
+  u8& h() { return HL.H; }
+  u8& l() { return HL.L; }
+  
+  u16& af() { return AF.raw; }
+  u16& bc() { return BC.raw; }
+  u16& de() { return DE.raw; }
+  u16& hl() { return HL.raw; } 
 };
 
 struct Cpu {
   Cpu();
   void Step(Mem&);
 private:
-  void DecodeAndExecute(u8);
+  void FetchDecodeExecute(Mem& mem);
   Registers regs;
+
+  template <int group>
+  u16 GetR16(u8 bits) {
+    static_assert(group > 0 && group < 3, "Invalid GetR16 group");
+    if constexpr (group == 1) {
+      switch(bits & 3) {
+        case 0: return regs.bc();
+        case 1: return regs.de();
+        case 2: return regs.hl();
+        case 3: return regs.sp;
+      }
+    } else if constexpr (group == 2) {
+      switch(bits & 3) {
+        case 0: return regs.bc();
+        case 1: return regs.de();
+        case 2: return regs.hl()++;
+        case 3: return regs.hl()--;
+      }
+    } else if constexpr (group == 3) {
+      switch(bits & 3) {
+        case 0: return regs.bc();
+        case 1: return regs.de();
+        case 2: return regs.hl();
+        case 3: return regs.af();
+      }
+    }
+  }
+
+  template <int group>
+  void SetR16(u8 bits, u16 val) {
+    static_assert(group > 0 && group < 3, "Invalid SetR16 group");
+    if constexpr (group == 1) {
+      switch(bits & 3) {
+        case 0: regs.bc() = val; break;
+        case 1: regs.de() = val; break;
+        case 2: regs.hl() = val; break;
+        case 3: regs.sp = val; break;
+      }
+    } else if constexpr (group == 2) {
+      switch(bits & 3) {
+        case 0: regs.bc() = val; break;
+        case 1: regs.de() = val; break;
+        case 2: regs.hl() = val; regs.hl()++; break;
+        case 3: regs.hl() = val; regs.hl()--; break;
+      }
+    } else if constexpr (group == 3) {
+      switch(bits & 3) {
+        case 0: regs.bc() = val; break;
+        case 1: regs.de() = val; break;
+        case 2: regs.hl() = val; break;
+        case 3: regs.af() = val; break;
+      }
+    }
+  }
+
+  u8 GetR8(u8 bits, Mem& mem) {
+    switch(bits & 7) {
+      case 0: return regs.b();
+      case 1: return regs.c();
+      case 2: return regs.d();
+      case 3: return regs.e();
+      case 4: return regs.h();
+      case 5: return regs.l();
+      case 6: return mem.Read8(regs.hl());
+      case 7: return regs.a();
+    }
+    return 0;
+  }
+
+  void SetR8(u8 bits, u8 val, Mem& mem) {
+    switch(bits & 7) {
+      case 0: regs.b() = val; break;
+      case 1: regs.c() = val; break;
+      case 2: regs.d() = val; break;
+      case 3: regs.e() = val; break;
+      case 4: regs.h() = val; break;
+      case 5: regs.l() = val; break;
+      case 6: return mem.Write8(regs.hl(), val);
+      case 7: regs.a() = val; break;
+    }
+  }
 };
 }

src/core/gb/Mem.cpp

@@ -2,20 +2,27 @@
 #include <util.hpp>
 #include <memory_regions.hpp>
 #include <fstream>
+#include <toml.hpp>
 
-namespace natsukashii::core {
-template <class T>
-T ReadCart(const std::unique_ptr<Cartridge>& cart, u16 addr) {
-  if constexpr(sizeof(T) == 1) return cart->Read8(addr);
-  else if constexpr(sizeof(T) == 2) return cart->Read16(addr);
-  else if constexpr(sizeof(T) == 4) return cart->Read32(addr);
+namespace natsukashii::gb::core {
+Mem::Mem() {
+  auto data = toml::parse("config.toml");
+  auto gb = toml::find(data, "gb");
+  auto bootromPath = toml::find<std::string>(gb, "bootrom");
+
+  LoadBootROM(bootromPath);
 }
 
-template <class T>
-void WriteCart(const std::unique_ptr<Cartridge>& cart, u16 addr, T val) {
-  if constexpr(sizeof(T) == 1) cart->Write8(addr, val);
-  else if constexpr(sizeof(T) == 2) cart->Write16(addr, val);
-  else if constexpr(sizeof(T) == 4) cart->Write32(addr, val);
+void Mem::LoadBootROM(const std::string &filename) {
+  std::ifstream file(filename, std::ios::binary);
+  file.unsetf(std::ios::skipws);
+
+  if(!file.is_open()) {
+    util::panic("Unable to open {}!", filename);
+  }
+
+  file.read(reinterpret_cast<char*>(bootrom), 256);
+  file.close();
 }
 
 void Mem::LoadROM(const std::string& filename) {
@@ -37,45 +44,49 @@ void Mem::LoadROM(const std::string& filename) {
              std::istream_iterator<u8>());
 
   file.close();
-
-  cart = std::make_unique<NoMBC>(rom);
+  switch(rom[0x147]) {
+    case 0:
+      cart = std::make_unique<NoMBC>(rom);
+      break;
+    default:
+      util::panic("Unimplemented cartridge type {:02X}!", rom[0x147]);
+  }
 }
 
-template <typename T>
-T Mem::Read(u16 addr) {
+u8 Mem::Read8(u16 addr) {
   switch(addr) {
-    case ROM_RNG00: return io.BootROMMapped() ? bootrom[addr] : ReadCart<T>(cart, addr);
-    case ROM_RNGNN: return ReadCart<T>(cart, addr);
+    case ROM_RNG00: return io.BootROMMapped() ? bootrom[addr] : cart->Read(addr);
+    case ROM_RNGNN: return cart->Read(addr);
     default: util::panic("[READ] Unimplemented addr:  {:04X}", addr);
   }
 
   return 0;
 }
 
-template u8 Mem::Read<u8>(u16);
-template u16 Mem::Read<u16>(u16);
-template u32 Mem::Read<u32>(u16);
-
-template <typename T>
-void Mem::Write(u16 addr, T val) {
+void Mem::Write8(u16 addr, u8 val) {
   switch(addr) {
-    case ROM_RNG00: case ROM_RNGNN: WriteCart<T>(cart, addr, val);
+    case ROM_RNG00: case ROM_RNGNN: cart->Write(addr, val);
     default: util::panic("[WRITE] Unimplemented addr:  {:04X}", addr);
   }
 }
 
-template void Mem::Write<u8>(u16, u8);
-template void Mem::Write<u16>(u16, u16);
-template void Mem::Write<u32>(u16, u32);
-
-template <typename T>
-T Mem::Consume(u16& pc) {
-  T result = Read<T>(pc);
-  pc += sizeof(T);
+u8 Mem::Consume8(u16& pc) {
+  u8 result = Read8(pc);
+  pc += 1;
   return result;
 }
 
-template u8 Mem::Consume<u8>(u16&);
-template u16 Mem::Consume<u16>(u16&);
-template u32 Mem::Consume<u32>(u16&);
+u16 Mem::Read16(u16 addr) {
+  return ((u16)Read8(addr) << 8) | Read8(addr + 1);
+}
+
+void Mem::Write16(u16 addr, u16 val) {
+  Write8(addr, val >> 8);
+  Write8(addr + 1, val & 0xff);
+}
+
+u16 Mem::Consume16(u16& pc) {
+  u8 hi = Consume8(pc);
+  return ((u16)hi << 8) | Consume8(pc);
+}
 }

src/core/gb/Mem.hpp

@@ -3,10 +3,10 @@
 #include <memory>
 #include <mio/mmap.hpp>
 #include <vector>
-#include <memory_regions.hpp>
-#include <mbc.hpp>
+#include "memory_regions.hpp"
+#include "mbc.hpp"
 
-namespace natsukashii::core {
+namespace natsukashii::gb::core {
 struct IO {
   [[nodiscard]] bool BootROMMapped() const { return ff50 != 1; }
 private:
@@ -14,15 +14,16 @@ private:
 };
 
 struct Mem {
-  Mem() = default;
+  Mem();
   void LoadROM(const std::string& filename);
-  template <typename T>
-  T Read(u16 addr);
-  template <typename T>
-  void Write(u16 addr, T val);
-  template <typename T>
-  T Consume(u16& pc);
+  u8 Read8(u16 addr);
+  void Write8(u16 addr, u8 val);
+  u8 Consume8(u16& pc);
+  u16 Read16(u16 addr);
+  void Write16(u16 addr, u16 val);
+  u16 Consume16(u16& pc);
 private:
+  void LoadBootROM(const std::string& filename);
   std::unique_ptr<Cartridge> cart;
   IO io{};
   u8 bootrom[BOOTROM_SIZE]{};

src/core/gb/mbc.cpp

@@ -2,23 +2,14 @@
 #include <utility>
 #include <util.hpp>
 
-namespace natsukashii::core {
+namespace natsukashii::gb::core {
 NoMBC::NoMBC(std::vector<u8> rom) : data(std::move(rom)) {}
 
-u8 NoMBC::Read8(u16 addr) {
+u8 NoMBC::Read(u16 addr) {
   return data[addr];
 }
 
-void NoMBC::Write8(u16 addr, u8 val) {
-  util::panic("Writing to a NoMBC cartridge is not allowed!");
-}
-
-u16 NoMBC::Read16(u16 addr) {
-  return ((u16)Read8(addr) << 8) | Read8(addr + 1);
-}
-
-void NoMBC::Write16(u16 addr, u16 val) {
-  Write8(addr, val >> 8);
-  Write8(addr + 1, val & 0xff);
+void NoMBC::Write(u16 addr, u8 val) {
+  util::panic("Writing to a NoMBC cartridge is not allowed! (Addr: {:04X})", addr);
 }
 }

src/core/gb/mbc.hpp

@@ -1,22 +1,17 @@
 #pragma once
 #include <common.hpp>
-#include <memory_regions.hpp>
 #include <vector>
 
-namespace natsukashii::core {
+namespace natsukashii::gb::core {
 struct Cartridge {
-  virtual u8 Read8(u16 addr);
-  virtual u16 Read16(u16 addr);
-  virtual void Write8(u16 addr, u8 val);
-  virtual void Write16(u16 addr, u16 val);
+  virtual u8 Read(u16 addr) { return 0; }
+  virtual void Write(u16 addr, u8 val) {}
 };
 
 struct NoMBC : public Cartridge {
   explicit NoMBC(std::vector<u8> rom);
-  u8 Read8(u16 addr) override;
-  void Write8(u16 addr, u8 val) override;
-  u16 Read16(u16 addr) override;
-  void Write16(u16 addr, u16 val) override;
+  u8 Read(u16 addr) override;
+  void Write(u16 addr, u8 val) override;
 private:
   std::vector<u8> data{};
 };

src/core/gb/memory_regions.hpp

@@ -3,21 +3,21 @@
 
 #define BOOTROM_SIZE 512
 #define ROM_STR00 0x0000
-#define ROM_END00 ROM_STR00 + 16 KiB - 1
+#define ROM_END00 ROM_STR00 + 0x3fff
 #define ROM_STRNN ROM_END00 + 1
-#define ROM_ENDNN ROM_STRNN + 16 KiB - 1
+#define ROM_ENDNN ROM_STRNN + 0x3fff
 #define ROM_RNG00 ROM_STR00 ... ROM_END00
 #define ROM_RNGNN ROM_STRNN ... ROM_ENDNN
 #define VRAM_START ROM_ENDNN + 1
-#define VRAM_END VRAM_START + 8 KiB - 1
+#define VRAM_END VRAM_START + 0x1fff
 #define VRAM_RANGE VRAM_START ... VRAM_END
 #define EXTRAM_START VRAM_END + 1
-#define EXTRAM_END EXTRAM_START + 8 KiB - 1
+#define EXTRAM_END EXTRAM_START + 0x1fff
 #define EXTRAM_RANGE EXTRAM_START ... EXTRAM_END
 #define WRAM_STR00 EXTRAM_END + 1
-#define WRAM_END00 WRAM_STR00 + 4 KiB - 1
+#define WRAM_END00 WRAM_STR00 + 0xfff
 #define WRAM_STRNN WRAM_END00 + 1
-#define WRAM_ENDNN WRAM_STRNN + 4 KiB - 1
+#define WRAM_ENDNN WRAM_STRNN + 0xfff
 #define WRAM_RNG00 WRAM_STR00 ... WRAM_END00
 #define WRAM_RNGNN WRAM_STRNN ... WRAM_ENDNN
 #define OAM_START WRAM_ENDNN + 1

src/core/n64/CMakeLists.txt

@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.20)
+project(n64 CXX)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+#find_package(mio REQUIRED)
+find_package(fmt REQUIRED)
+#find_package(toml11 REQUIRED)
+
+add_library(n64 Core.hpp Core.cpp Cpu.hpp Cpu.cpp Mem.cpp Mem.hpp memory_regions.hpp)
+target_include_directories(n64 PRIVATE . ..)
+target_link_libraries(n64 PUBLIC fmt::fmt)

src/core/n64/Core.cpp

@@ -0,0 +1,9 @@
+#include <Core.hpp>
+
+namespace natsukashii::n64::core {
+Core::Core(const std::string& rom) {}
+
+void Core::Run() {
+
+}
+}

src/core/n64/Core.hpp

@@ -0,0 +1,12 @@
+#pragma once
+#include <BaseCore.hpp>
+#include <Cpu.hpp>
+#include <Mem.hpp>
+#include <string>
+
+namespace natsukashii::n64::core {
+struct Core : natsukashii::core::BaseCore {
+  Core(const std::string&);
+  virtual void Run() override;
+};
+}

src/core/n64/Cpu.cpp

@@ -0,0 +1 @@
+#include <Cpu.hpp>

src/core/n64/Cpu.hpp

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace natsukashii::n64::core {
+struct Cpu {
+
+};
+}

src/core/n64/Mem.cpp

@@ -0,0 +1,33 @@
+#include <Mem.hpp>
+#include <fstream>
+#include <util.hpp>
+
+namespace natsukashii::n64::core {
+Mem::Mem() {
+  rdram.resize(RDRAM_SIZE);
+  sram.resize(SRAM_SIZE);
+}
+
+void Mem::LoadROM(const std::string& filename) {
+  std::ifstream file(filename, std::ios::binary);
+  file.unsetf(std::ios::skipws);
+
+  if(!file.is_open()) {
+    util::panic("Unable to open {}!", filename);
+  }
+
+  file.seekg(std::ios::end);
+  auto size = file.tellg();
+  file.seekg(std::ios::beg);
+
+  std::vector<u8> rom;
+  rom.reserve(size);
+  rom.insert(rom.begin(),
+             std::istream_iterator<u8>(file),
+             std::istream_iterator<u8>());
+
+  file.close();
+  util::SwapN64Rom(size, rom.data());
+  memcpy(dmem, rom.data(), 0x1000);
+}
+}

src/core/n64/Mem.hpp

@@ -0,0 +1,16 @@
+#pragma once
+#include <common.hpp>
+#include <memory_regions.hpp>
+#include <vector>
+
+namespace natsukashii::n64::core {
+struct Mem {
+  Mem();
+  void LoadROM(const std::string&);
+private:
+  std::vector<u8> cart, rdram, sram;
+  u8 dmem[DMEM_SIZE]{}, imem[IMEM_SIZE]{}, pif_ram[PIF_RAM_SIZE]{};
+  u8 pif_bootrom[PIF_BOOTROM_SIZE]{};
+  size_t rom_mask;
+};
+}

src/core/n64/memory_regions.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#define RDRAM_SIZE 0x800000
+#define RDRAM_DSIZE (RDRAM_SIZE - 1)
+#define SRAM_SIZE 0x8000000
+#define SRAM_DSIZE (SRAM_SIZE - 1)
+#define DMEM_SIZE 0x1000
+#define DMEM_DSIZE (DMEM_SIZE - 1)
+#define IMEM_SIZE 0x1000
+#define IMEM_DSIZE (IMEM_SIZE - 1)
+#define PIF_RAM_SIZE 0x40
+#define PIF_RAM_DSIZE (PIF_RAM_SIZE - 1)
+#define PIF_BOOTROM_SIZE 0x7C0
+#define PIF_BOOTROM_DSIZE (PIF_BOOTROM_SIZE - 1)

src/core/util.hpp

@@ -2,6 +2,7 @@
 #include <common.hpp>
 #include <type_traits>
 #include <cassert>
+#include <portable_endian_bswap.h>
 
 namespace natsukashii::util {
 template <typename ...Args>
@@ -36,4 +37,62 @@ T BitSlice(const T& num, int start, int end) {
   return (num >> start) & ((1 << correctedEnd) - 1);
 }
 
+template <typename T, bool FromHToBE = false>
+auto GetSwapFunc(T num) -> T {
+  if constexpr(sizeof(T) == 2) {
+    if constexpr(FromHToBE)
+      return htobe16(num);
+    return be16toh(num);
+  } else if constexpr(sizeof(T) == 4) {
+    if constexpr(FromHToBE)
+      return htobe32(num);
+    return be32toh(num);
+  } else if constexpr(sizeof(T) == 8) {
+    if constexpr(FromHToBE)
+      return htobe32(num);
+    return be32toh(num);
+  }
+}
+
+template <typename T>
+inline T ReadAccess(u8* data, u32 index) {
+  static_assert(sizeof(T) != 2 && sizeof(T) != 4 && sizeof(T) != 8);
+  T result = 0;
+  memcpy(&result, &data[index], sizeof(T));
+  return GetSwapFunc(result);
+}
+
+template <typename T>
+inline void WriteAccess(u8* data, u32 index, T val) {
+  static_assert(sizeof(T) != 2 && sizeof(T) != 4 && sizeof(T) != 8);
+  T temp = GetSwapFunc<T, true>(val);
+  memcpy(&data[index], &temp, sizeof(T));
+}
+
+#define Z64 0x80371240
+#define N64 0x40123780
+#define V64 0x37804012
+
+inline void SwapN64Rom(size_t size, u8* data) {
+  u32 endianness;
+  memcpy(&endianness, data, 4);
+  endianness = be32toh(endianness);
+  switch(endianness) {
+    case V64:
+      for(int i = 0; i < size; i += 2) {
+        u16 original = *(u16*)&data[i];
+        *(u16*)&data[i] = bswap_16(original);
+      }
+      break;
+    case N64:
+      for(int i = 0; i < size; i += 4) {
+        u32 original = *(u32*)&data[i];
+        *(u32*)&data[i] = bswap_32(original);
+      }
+      break;
+    case Z64: break;
+    default:
+      panic("Unrecognized rom format! Make sure this is a valid Nintendo 64 ROM dump!\n");
+  }
+}
 }

src/frontend/qt/CMakeLists.txt

@@ -9,6 +9,8 @@ set(CMAKE_AUTOUIC ON)
 
 find_package(Qt5 COMPONENTS Widgets REQUIRED)
 
-add_library(frontend Frontend.hpp)
+add_library(frontend Frontend.hpp Frontend.cpp)
+
+target_compile_definitions(frontend PUBLIC FRONTEND_QT)
 target_include_directories(frontend PUBLIC .)
 target_link_libraries(frontend PUBLIC Qt5::Widgets)

src/frontend/sdl/CMakeLists.txt

@@ -6,5 +6,6 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 find_package(SDL2 REQUIRED)
 
 add_library(frontend Frontend.cpp Frontend.hpp)
-target_include_directories(frontend PUBLIC . ../../core)
+target_compile_definitions(frontend PUBLIC FRONTEND_SDL)
+target_include_directories(frontend PUBLIC . ../../core ../../core/gb ../../core/n64)
 target_link_libraries(frontend PUBLIC SDL2)

src/frontend/sdl/Frontend.cpp

@@ -1,4 +1,8 @@
 #include <Frontend.hpp>
+#include <algorithm>
+#include <cctype>
+#include <gb/Core.hpp>
+#include <n64/Core.hpp>
 
 namespace natsukashii::frontend {
 App::~App() {
@@ -7,16 +11,25 @@ App::~App() {
   SDL_Quit();
 }
 
-App::App() {
+App::App(const std::string& rom) {
   SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
   window = SDL_CreateWindow("natukashii", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN);
   renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
   id = SDL_GetWindowID(window);
+
+  std::string ext{rom.begin() + rom.find_first_of('.') + 1, rom.end()};
+  std::transform(ext.begin(), ext.end(), ext.begin(), [](unsigned char c){
+    return std::tolower(c);
+  });
+
+  if(ext == "gb") core = std::make_unique<gb::core::Core>(rom);
+  else if(ext == "n64") core = std::make_unique<n64::core::Core>(rom);
+  else util::panic("Unimplemented core!");
 }
 
 void App::Run() {
   while(!quit) {
-    gb.Run();
+    core->Run();
 
     SDL_Event event;
     SDL_PollEvent(&event);

src/frontend/sdl/Frontend.hpp

@@ -1,17 +1,21 @@
 #pragma once
 #include <SDL2/SDL.h>
-#include <gb/Core.hpp>
+#include <BaseCore.hpp>
+#include <string>
+#include <memory>
+#include <util.hpp>
 
 namespace natsukashii::frontend {
+using namespace natsukashii::core;
 struct App {
   ~App();
-  App();
+  App(const std::string&);
   void Run();
 private:
   SDL_Window *window = nullptr;
   SDL_Renderer *renderer = nullptr;
   Uint32 id;
   bool quit = false;
-  core::Core gb;
+  std::unique_ptr<BaseCore> core;
 };
 }

src/main.cpp

@@ -1,7 +1,20 @@
-#include <Frontend.hpp>
+#ifdef FRONTEND_QT
+#include <qt/Frontend.hpp>
+#elifdef FRONTEND_SDL
+#include <sdl/Frontend.hpp>
+#endif
 
-int main() {
+#include <util.hpp>
+
+int main(int argc, char* argv[]) {
+#ifdef FRONTEND_SDL
+  if(argc < 2) {
+    natsukashii::util::panic("Usage: natsukashii [rom]");
+  }
+  natsukashii::frontend::App app(argv[1]);
+#else
   natsukashii::frontend::App app;
+#endif
   app.Run();
   return 0;
 }