Boot: Add support for booting NAND titles with just the ID

Source/Core/Core/Boot/Boot.cpp

@@ -339,7 +339,8 @@ bool CBoot::BootUp(std::unique_ptr<BootParameters> boot)
         HID4.SBE = 1;
         // Because there is no TMD to get the requested system (IOS) version from,
         // we default to IOS58, which is the version used by the Homebrew Channel.
-        SetupWiiMemory(0x000000010000003a);
+        SetupWiiMemory();
+        IOS::HLE::GetIOS()->BootIOS(0x000000010000003a);
       }
       else
       {
@@ -363,6 +364,12 @@ bool CBoot::BootUp(std::unique_ptr<BootParameters> boot)
       return Boot_WiiWAD(nand.content_path);
     }
 
+    bool operator()(const BootParameters::NANDTitle& nand_title) const
+    {
+      SetDefaultDisc();
+      return BootNANDTitle(nand_title.id);
+    }
+
     bool operator()(const BootParameters::IPL& ipl) const
     {
       NOTICE_LOG(BOOT, "Booting GC IPL: %s", ipl.path.c_str());

Source/Core/Core/Boot/Boot.h

@@ -50,6 +50,11 @@ struct BootParameters
     std::string content_path;
   };
 
+  struct NANDTitle
+  {
+    u64 id;
+  };
+
   struct IPL
   {
     explicit IPL(DiscIO::Region region_);
@@ -67,7 +72,7 @@ struct BootParameters
 
   static std::unique_ptr<BootParameters> GenerateFromFile(const std::string& path);
 
-  using Parameters = std::variant<Disc, Executable, NAND, IPL, DFF>;
+  using Parameters = std::variant<Disc, Executable, NAND, NANDTitle, IPL, DFF>;
   BootParameters(Parameters&& parameters_);
 
   Parameters parameters;
@@ -99,6 +104,7 @@ private:
   static void UpdateDebugger_MapLoaded();
 
   static bool Boot_WiiWAD(const std::string& filename);
+  static bool BootNANDTitle(u64 title_id);
 
   static void SetupMSR();
   static void SetupBAT(bool is_wii);
@@ -109,7 +115,7 @@ private:
   static bool Load_BS2(const std::string& boot_rom_filename);
 
   static void SetupGCMemory();
-  static bool SetupWiiMemory(u64 ios_title_id);
+  static bool SetupWiiMemory();
 };
 
 class BootExecutableReader

Source/Core/Core/Boot/Boot_BS2Emu.cpp

@@ -213,7 +213,7 @@ bool CBoot::EmulatedBS2_GC(const DiscIO::Volume& volume)
   return RunApploader(/*is_wii*/ false, volume);
 }
 
-bool CBoot::SetupWiiMemory(u64 ios_title_id)
+bool CBoot::SetupWiiMemory()
 {
   static const std::map<DiscIO::Region, const RegionSetting> region_settings = {
       {DiscIO::Region::NTSC_J, {"JPN", "NTSC", "JP", "LJ"}},
@@ -308,9 +308,6 @@ bool CBoot::SetupWiiMemory(u64 ios_title_id)
   // It is fine to always use the latest value as apploaders work with all versions.
   Memory::Write_U16(0x0113, 0x0000315e);
 
-  if (!IOS::HLE::GetIOS()->BootIOS(ios_title_id))
-    return false;
-
   Memory::Write_U8(0x80, 0x0000315c);         // OSInit
   Memory::Write_U16(0x0000, 0x000030e0);      // PADInit
   Memory::Write_U32(0x80000000, 0x00003184);  // GameID Address
@@ -367,7 +364,7 @@ bool CBoot::EmulatedBS2_Wii(const DiscIO::Volume& volume)
   Memory::Write_U32(0, 0x3194);
   Memory::Write_U32(static_cast<u32>(data_partition.offset >> 2), 0x3198);
 
-  if (!SetupWiiMemory(tmd.GetIOSId()))
+  if (!SetupWiiMemory() || !IOS::HLE::GetIOS()->BootIOS(tmd.GetIOSId()))
     return false;
 
   DVDRead(volume, 0x00000000, 0x00000000, 0x20, DiscIO::PARTITION_NONE);  // Game Code

Source/Core/Core/Boot/Boot_WiiWAD.cpp

@@ -21,6 +21,20 @@
 
 #include "DiscIO/NANDContentLoader.h"
 
+bool CBoot::BootNANDTitle(const u64 title_id)
+{
+  UpdateStateFlags([](StateFlags* state) {
+    state->type = 0x03;  // TYPE_RETURN
+  });
+
+  if (title_id == Titles::SYSTEM_MENU)
+    IOS::HLE::CreateVirtualFATFilesystem();
+
+  SetupWiiMemory();
+  auto* ios = IOS::HLE::GetIOS();
+  return ios->GetES()->LaunchTitle(title_id);
+}
+
 bool CBoot::Boot_WiiWAD(const std::string& _pFilename)
 {
   UpdateStateFlags([](StateFlags* state) {

Source/Core/Core/ConfigManager.cpp

@@ -902,6 +902,21 @@ struct SetGameMetadata
     return true;
   }
 
+  bool operator()(const BootParameters::NANDTitle& nand_title) const
+  {
+    IOS::HLE::Kernel ios;
+    const IOS::ES::TMDReader tmd = ios.GetES()->FindInstalledTMD(nand_title.id);
+    if (!tmd.IsValid() || !IOS::ES::IsChannel(nand_title.id))
+    {
+      PanicAlertT("This title cannot be booted.");
+      return false;
+    }
+    config->SetRunningGameMetadata(tmd);
+    config->bWii = true;
+    *region = tmd.GetRegion();
+    return true;
+  }
+
   bool operator()(const BootParameters::IPL& ipl) const
   {
     config->bWii = false;

Source/Core/DolphinQt2/MainWindow.cpp

@@ -652,8 +652,7 @@ void MainWindow::PerformOnlineUpdate(const std::string& region)
 
 void MainWindow::BootWiiSystemMenu()
 {
-  StartGame(QString::fromStdString(
-      Common::GetTitleContentPath(Titles::SYSTEM_MENU, Common::FROM_CONFIGURED_ROOT)));
+  StartGame(std::make_unique<BootParameters>(BootParameters::NANDTitle{Titles::SYSTEM_MENU}));
 }
 
 void MainWindow::NetPlayInit()

Source/Core/DolphinWX/FrameTools.cpp

@@ -1225,7 +1225,7 @@ void CFrame::OnShowCheatsWindow(wxCommandEvent& WXUNUSED(event))
 
 void CFrame::OnLoadWiiMenu(wxCommandEvent& WXUNUSED(event))
 {
-  BootGame(Common::GetTitleContentPath(Titles::SYSTEM_MENU, Common::FROM_CONFIGURED_ROOT));
+  StartGame(std::make_unique<BootParameters>(BootParameters::NANDTitle{Titles::SYSTEM_MENU}));
 }
 
 void CFrame::OnInstallWAD(wxCommandEvent& event)