Handle BLX branches in CardiTryReadCardDmaPatch (#91)

* DATEL: Make read sector function vram safe

The platform code was performing reads in single byte units, breaking in case the destination buffer was in vram.
This caused issues with some games (e.g. Castelvania Order of Ecclesia), and also broke soft resetting.

* Halve wait timeout on sector read since we read 2 bytes at the time

.github/workflows/nightly.yml

@@ -2,7 +2,6 @@ name: Build Pico Loader
 
 on:
   push:
-    branches: ["develop"]
     paths-ignore:
       - 'README.md'
   pull_request:
@@ -19,12 +18,15 @@ jobs:
           "ACE3DS",
           "AK2",
           "AKRPG",
+          "DATEL",
           "DSPICO",
           "DSTT",
+          "EZP",
           "G003",
           "M3DS",
           "R4",
           "R4iDSN",
+          "STARGATE",
           "SUPERCARD"
         ]
     runs-on: ubuntu-latest
@@ -46,14 +48,15 @@ jobs:
       - name: Run build script
         run: |
           make PICO_PLATFORM=${{ matrix.platform }}
-          mv picoLoader7.bin data/picoLoader7.bin
-          mv picoLoader9_${{ matrix.platform }}.bin data/picoLoader9.bin
+      - name: Package artifact
+        run: |
+          mkdir Pico_Loader_${{ matrix.platform }}
+          mv picoLoader7.bin data/aplist.bin data/savelist.bin Pico_Loader_${{ matrix.platform }}
+          mv picoLoader9_${{ matrix.platform }}.bin Pico_Loader_${{ matrix.platform }}/picoLoader9.bin
       - name: Publish build to GH Actions
         uses: actions/upload-artifact@v4
         with:
           path: |
-            data/aplist.bin
-            data/savelist.bin
-            data/picoLoader7.bin
-            data/picoLoader9.bin
-          name: Pico Loader for ${{ matrix.platform }}
+            Pico_Loader_${{ matrix.platform }}
+          # For some reason without explicitly setting a name there is some odd conflicts
+          name: Pico_Loader_${{ matrix.platform }}

.github/workflows/release.yml

@@ -0,0 +1,67 @@
+name: Build Pico Loader release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  pico_loader:
+    strategy:
+      matrix:
+        platform: [
+          "ACE3DS",
+          "AK2",
+          "AKRPG",
+          "DATEL",
+          "DSPICO",
+          "DSTT",
+          "EZP",
+          "G003",
+          "M3DS",
+          "R4",
+          "R4iDSN",
+          "STARGATE",
+          "SUPERCARD"
+        ]
+    runs-on: ubuntu-latest
+    container: skylyrac/blocksds:slim-v1.13.1
+    name: Build Pico Loader
+    env:
+      DOTNET_CLI_TELEMETRY_OPTOUT: 1
+      DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+      DOTNET_SYSTEM_GLOBALIZATION_INVARIANT: 1
+      DOTNET_NOLOGO: true
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 9.x
+      - name: Install zip
+        run:
+          apt-get update && apt-get -y install zip
+      - name: Run build script
+        run: |
+          make PICO_PLATFORM=${{ matrix.platform }}
+      - name: Package artifact
+        run: |
+          mkdir Pico_Loader_${{ matrix.platform }}
+          mv picoLoader7.bin data/aplist.bin data/savelist.bin Pico_Loader_${{ matrix.platform }}
+          mv picoLoader9_${{ matrix.platform }}.bin Pico_Loader_${{ matrix.platform }}/picoLoader9.bin
+      - name: Publish build to GH Actions
+        uses: actions/upload-artifact@v4
+        with:
+          path: |
+            Pico_Loader_${{ matrix.platform }}
+          # For some reason without explicitly setting a name there is some odd conflicts
+          name: Pico_Loader_${{ matrix.platform }}
+      - name: Package for release
+        run: |
+          cd Pico_Loader_${{ matrix.platform }} && zip -r $PWD.zip *
+      - name: Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            Pico_Loader_${{ matrix.platform }}.zip

README.md

@@ -25,14 +25,17 @@ Note that there can be some game compatibility differences between different pla
 | ACE3DS        | Ace3DS+, Gateway 3DS (blue), r4isdhc.com.cn carts, r4isdhc.hk carts 2020+, various derivatives | ✅ |
 | AK2           | Acekard 2, 2.1, 2i, r4ids.cn, various derivatives                                              | ❌ |
 | AKRPG         | Acekard RPG SD card                                                                            | ❌ |
+| DATEL         | DATEL devices consisting of GAMES n' MUSIC and Action Replay DS(i) Media Edition               | ❌ |
 | DSPICO        | DSpico                                                                                         | ✅ |
 | DSTT          | DSTT, SuperCard DSONE SDHC, r4isdhc.com carts 2014+, r4i-sdhc.com carts, various derivatives   | ❌ |
+| EZP           | EZ-Flash Parallel                                                                              | ❌ |
 | G003          | M3i Zero (GMP-Z003)                                                                            | ✅ |
 | ISNITRO       | Supports the IS-NITRO-EMULATOR through agb semihosting.                                        | ❌ |
 | M3DS          | M3 DS Real, M3i Zero, iTouchDS, r4rts.com, r4isdhc.com RTS (black)                             | ❌ |
 | MELONDS       | Melon DS support for testing purposes only.                                                    | ❌ |
 | R4            | Original R4DS (non-SDHC), M3 DS Simply                                                         | ❌ |
 | R4iDSN        | r4idsn.com                                                                                     | ❌ |
+| STARGATE      | Stargate 3DS DS-mode                                                                           | ✅ |
 | SUPERCARD     | SuperCard (Slot-2 flashcart)                                                                   | ❌ |
 
 The DMA column indicates whether DMA card reads are implemented for the platform . Without DMA card reads, some games can have cache related issues.<br>
@@ -42,7 +45,7 @@ Note that there are still SDK versions and variants for which Pico Loader does n
 We recommend using WSL (Windows Subsystem for Linux), or MSYS2 to compile this repository.
 The steps provided will assume you already have one of those environments set up.
 
-1. Install [BlocksDS](https://blocksds.skylyrac.net/docs/setup/options/)
+1. Install [BlocksDS](https://blocksds.skylyrac.net/docs/setup/)
 2. Install [.NET 9.0](https://learn.microsoft.com/en-us/dotnet/core/install/linux-ubuntu-install?tabs=dotnet9&pivots=os-linux-ubuntu-2404) for your system (note: this link points to the instructions for Ubuntu, but links for most OS'es are available on the same page)
 
 ## Compiling

arm7/source/core/Environment.cpp

@@ -2,6 +2,9 @@
 #include "picoAgbAdapter.h"
 #include "Environment.h"
 
+#define NOCASH_ID         0x67246F6E
+#define NOCASH_ID_MELONDS 0x6F6C656D
+
 u32 Environment::_flags;
 
 static bool detectIsNitroEmulator()
@@ -15,10 +18,10 @@ static bool detectIsNitroEmulator()
     return true;
 }
 
-static bool detectNocashPrintSuppport()
+static bool detectNocashPrintSupport()
 {
     u32 nocashIdentifier = *(vu32*)0x04FFFA00;
-    return nocashIdentifier == 0x67246F6E; //no$g
+    return nocashIdentifier == NOCASH_ID || nocashIdentifier == NOCASH_ID_MELONDS;
 }
 
 static bool detectPicoAgbAdapter()
@@ -55,7 +58,7 @@ void Environment::Initialize(bool dsiMode)
     }
     if (!(_flags & ENVIRONMENT_FLAGS_IS_NITRO_EMULATOR))
     {
-        if (detectNocashPrintSuppport())
+        if (detectNocashPrintSupport())
             _flags |= ENVIRONMENT_FLAGS_NOCASH_PRINT;
     }
 }

arm7/source/loader/CardSaveArranger.cpp

@@ -1,32 +1,54 @@
 #include "common.h"
+#include <algorithm>
 #include <string.h>
 #include "SaveList.h"
 #include "SaveListFactory.h"
 #include "fileInfo.h"
+#include "gameCode.h"
 #include "CardSaveArranger.h"
 
 #define SAVE_LIST_PATH      "/_pico/savelist.bin"
 #define DEFAULT_SAVE_SIZE   (512 * 1024)
 #define SAVE_FILL_VALUE     0xFF
+#define NTR_NAND_BLOCK_SIZE 0x20000
+#define TWL_NAND_BLOCK_SIZE 0x80000
+#define NAND_RW_REGION_END  0x07A00000
 
-bool CardSaveArranger::SetupCardSave(u32 gameCode, const TCHAR* savePath) const
+static const u8 sBandBrothersSaveId[12] = { 0x48, 0x8A, 0x00, 0x00, 0x42, 0x42, 0x44, 0x58, 0x31, 0x32, 0x33, 0x34 };
+static const u8 sJamWithTheBandSaveId[16] = { 0xEC, 0x00, 0x9E, 0xA1, 0x51, 0x65, 0x34, 0x35, 0x30, 0x35, 0x30, 0x31, 0x19, 0x19, 0x02, 0x0A };
+
+bool CardSaveArranger::SetupCardSave(const nds_header_ntr_t* header, const TCHAR* savePath) const
 {
-    SaveList* saveList = SaveListFactory().CreateFromFile(SAVE_LIST_PATH);
+    auto saveType = CardSaveType::None;
     u32 saveSize = DEFAULT_SAVE_SIZE;
-    if (saveList)
+    if (header->nandBackupRegionStart != 0)
     {
-        const auto saveListEntry = saveList->FindEntry(gameCode);
-        if (!saveListEntry)
+        saveType = CardSaveType::Nand;
+        u32 blockSize = header->IsTwlRom() ? TWL_NAND_BLOCK_SIZE : NTR_NAND_BLOCK_SIZE;
+        u32 nandBackupRegionStart = header->nandBackupRegionStart * blockSize;
+        saveSize = NAND_RW_REGION_END - nandBackupRegionStart;
+        LOG_DEBUG("NAND save. Size: 0x%X.", saveSize);
+    }
+    else
+    {
+        SaveList* saveList = SaveListFactory().CreateFromFile(SAVE_LIST_PATH);
+        if (saveList)
         {
-            LOG_WARNING("Game code %c%c%c%c not found in save list\n",
-                gameCode & 0xFF, (gameCode >> 8) & 0xFF, (gameCode >> 16) & 0xFF, gameCode >> 24);
+            const auto saveListEntry = saveList->FindEntry(header->gameCode);
+            if (!saveListEntry)
+            {
+                LOG_WARNING("Game code %c%c%c%c not found in save list\n",
+                    header->gameCode & 0xFF, (header->gameCode >> 8) & 0xFF,
+                    (header->gameCode >> 16) & 0xFF, header->gameCode >> 24);
+            }
+            else
+            {
+                saveType = saveListEntry->GetSaveType();
+                saveSize = saveListEntry->GetSaveSize();
+                saveListEntry->Dump();
+            }
+            delete saveList;
         }
-        else
-        {
-            saveSize = saveListEntry->GetSaveSize();
-            saveListEntry->Dump();
-        }
-        delete saveList;
     }
     if (saveSize == 0)
     {
@@ -50,8 +72,9 @@ bool CardSaveArranger::SetupCardSave(u32 gameCode, const TCHAR* savePath) const
             return false;
         }
 
-        auto ffBuffer = std::make_unique<u8[]>(512);
-        memset(ffBuffer.get(), SAVE_FILL_VALUE, 512);
+        const u32 ffBufferSize = 32 * 1024;
+        auto ffBuffer = std::make_unique<u8[]>(ffBufferSize);
+        memset(ffBuffer.get(), SAVE_FILL_VALUE, ffBufferSize);
 
         u32 offset = initialSize;
         // Align to 512 bytes
@@ -68,17 +91,45 @@ bool CardSaveArranger::SetupCardSave(u32 gameCode, const TCHAR* savePath) const
             offset += remainingTo512;
         }
 
-        // Write in 512-byte blocks
+        // Write in up to 32kb blocks
         while (offset < saveSize)
         {
+            u32 bytesToWrite = std::min<u32>(saveSize - offset, ffBufferSize);
             UINT bytesWritten = 0;
-            if (f_write(file.get(), ffBuffer.get(), 512, &bytesWritten) != FR_OK ||
-                bytesWritten != 512)
+            if (f_write(file.get(), ffBuffer.get(), bytesToWrite, &bytesWritten) != FR_OK ||
+                bytesWritten != bytesToWrite)
             {
                 LOG_FATAL("Failed to expand save file\n");
                 return false;
             }
-            offset += 512;
+            offset += bytesToWrite;
+        }
+
+        // Additional save initialization
+        if (header->gameCode == GAMECODE("AXBJ"))
+        {
+            // Write save id for Band Brothers
+            UINT bytesWritten = 0;
+            if (f_lseek(file.get(), 0) != FR_OK ||
+                f_write(file.get(), sBandBrothersSaveId, sizeof(sBandBrothersSaveId), &bytesWritten) != FR_OK ||
+                bytesWritten != sizeof(sBandBrothersSaveId))
+            {
+                LOG_FATAL("Failed to write Band Brothers save id\n");
+                return false;
+            }
+        }
+        else if (header->gameCode == GAMECODE("UXBP"))
+        {
+            // Write save id for Jam with the Band
+            // See also https://github.com/melonDS-emu/melonDS/blob/3a3388c4c50e8735af125c1af4d89e457f5e9035/src/NDSCart.cpp#L1067
+            UINT bytesWritten = 0;
+            if (f_lseek(file.get(), saveSize - 0x800) != FR_OK ||
+                f_write(file.get(), sJamWithTheBandSaveId, sizeof(sJamWithTheBandSaveId), &bytesWritten) != FR_OK ||
+                bytesWritten != sizeof(sJamWithTheBandSaveId))
+            {
+                LOG_FATAL("Failed to write Jam with the Band save id\n");
+                return false;
+            }
         }
     }
 

arm7/source/loader/CardSaveArranger.h

@@ -1,12 +1,13 @@
 #pragma once
+#include "ndsHeader.h"
 
 /// @brief Class for setting up the save file for retail card roms.
 class CardSaveArranger
 {
 public:
     /// @brief Sets up the save file at \p savePath for a retail card rom with the given \p gameCode.
-    /// @param gameCode The game code of the retail card rom.
+    /// @param header The header of the retail card rom.
     /// @param savePath The desired save file path.
     /// @return \c true when setting up the save was successful, or \c false otherwise.
-    bool SetupCardSave(u32 gameCode, const TCHAR* savePath) const;
+    bool SetupCardSave(const nds_header_ntr_t* header, const TCHAR* savePath) const;
 };

arm7/source/loader/ConsoleRegion.h

@@ -0,0 +1,12 @@
+#pragma once
+
+/// @brief Enum for DSi console region.
+enum class ConsoleRegion
+{
+    Japan,
+    America,
+    Europe,
+    Australia,
+    China,
+    Korea
+};

arm7/source/loader/DsiWareSaveArranger.cpp

@@ -1,5 +1,6 @@
 #include "common.h"
 #include <string.h>
+#include <algorithm>
 #include <memory>
 #include "DsiWareSaveArranger.h"
 
@@ -70,7 +71,7 @@ bool DsiWareSaveArranger::SetupDsiWareSaveFile(const TCHAR* savePath, u32 saveSi
         if (f_lseek(file.get(), saveSize) != FR_OK ||
             f_lseek(file.get(), 0) != FR_OK)
         {
-            LOG_FATAL("Failed to create private save file\n");
+            LOG_FATAL("Failed to create DSiWare save file\n");
             return false;
         }
 
@@ -80,21 +81,28 @@ bool DsiWareSaveArranger::SetupDsiWareSaveFile(const TCHAR* savePath, u32 saveSi
         if (f_write(file.get(), fatHeader.get(), sizeof(fat_header_t), &bytesWritten) != FR_OK ||
             bytesWritten != sizeof(fat_header_t))
         {
-            LOG_FATAL("Failed to format private save file\n");
+            LOG_FATAL("Failed to format DSiWare save file\n");
             return false;
         }
 
-        memset(fatHeader.get(), 0, 512);
+        fatHeader.reset();
 
-        while (f_tell(file.get()) < saveSize)
+        const u32 clearBufferSize = 32 * 1024;
+        auto clearBuffer = std::make_unique<u8[]>(clearBufferSize);
+        memset(clearBuffer.get(), 0, clearBufferSize);
+
+        u32 offset = f_tell(file.get());
+        while (offset < saveSize)
         {
+            u32 bytesToWrite = std::min<u32>(saveSize - offset, clearBufferSize);
             bytesWritten = 0;
-            if (f_write(file.get(), fatHeader.get(), 512, &bytesWritten) != FR_OK ||
-                bytesWritten != 512)
+            if (f_write(file.get(), clearBuffer.get(), bytesToWrite, &bytesWritten) != FR_OK ||
+                bytesWritten != bytesToWrite)
             {
-                LOG_FATAL("Failed to format private save file\n");
+                LOG_FATAL("Failed to format DSiWare save file\n");
                 return false;
             }
+            offset += bytesToWrite;
         }
     }
 

arm7/source/loader/NdsLoader.cpp

@@ -165,9 +165,9 @@ void NdsLoader::Load(BootMode bootMode)
         }
     }
 
-    bool isHomebrew = (_romHeader.ntrHeader.makerCode[0] == 0 && _romHeader.ntrHeader.makerCode[1] == 0)
-        || _romHeader.ntrHeader.arm9AutoLoadDoneHookAddress == 0
-        || _romHeader.ntrHeader.arm7LoadAddress >= 0x03000000;
+    bool isHomebrew = (_romHeader.makerCode[0] == 0 && _romHeader.makerCode[1] == 0)
+        || (_romHeader.arm9AutoLoadDoneHookAddress == 0 && _romHeader.arm7AutoLoadDoneHookAddress == 0)
+        || _romHeader.arm7LoadAddress >= 0x03000000;
 
     if (isHomebrew)
     {
@@ -186,16 +186,7 @@ void NdsLoader::Load(BootMode bootMode)
         memset(&_dsiwareSaveResult, 0, sizeof(_dsiwareSaveResult));
         if (bootMode != BootMode::Multiboot)
         {
-            if (!_romHeader.IsDsiWare())
-            {
-                if (bootMode != BootMode::SdkResetSystem)
-                {
-                    HandleCardSave();
-                }
-
-                HandleAntiPiracy();
-            }
-            else
+            if (_romHeader.IsDsiWare())
             {
                 if (bootMode == BootMode::SdkResetSystem)
                 {
@@ -210,12 +201,26 @@ void NdsLoader::Load(BootMode bootMode)
                     return;
                 }
             }
+            else
+            {
+                if (bootMode != BootMode::SdkResetSystem)
+                {
+                    if (!CardSaveArranger().SetupCardSave(&_romHeader, _savePath))
+                    {
+                        ErrorDisplay().PrintError("Failed to setup save file.");
+                        return;
+                    }
+                }
+
+                HandleAntiPiracy();
+            }
         }
     }
 
     if (bootMode == BootMode::Normal)
     {
         bootType = _romHeader.IsDsiWare() ? BOOT_TYPE_NAND : BOOT_TYPE_CARD;
+        HandleIQueRegionFreePatching();
     }
     else if (bootMode == BootMode::Multiboot)
     {
@@ -224,14 +229,14 @@ void NdsLoader::Load(BootMode bootMode)
 
     SetupSharedMemory(cardId, agbMem, resetParam, romOffset, bootType);
 
-    if (Environment::IsDsiMode() && _romHeader.IsTwlRom())
-    {
-        SetupTwlConfig();
-        TwlAes().SetupAes(&_romHeader);
-    }
-
     if (Environment::IsDsiMode())
     {
+        if (_romHeader.IsTwlRom())
+        {
+            SetupTwlConfig();
+            TwlAes().SetupAes(&_romHeader);
+        }
+
         RemapWram();
     }
 
@@ -292,6 +297,9 @@ void NdsLoader::Load(BootMode bootMode)
     {
         SetupDsiDeviceList();
 
+        // Set twl wram locking (REG_MBK9) settings from rom header
+        REG_MBK9 = _romHeader.mbk9Setting[0] | (_romHeader.mbk9Setting[1] << 8) | (_romHeader.mbk9Setting[2] << 16);
+
         u32 scfgExt7 = 0x93FBFB00 | (_romHeader.arm7ScfgExt7 & 0x40407);
         REG_SCFG_EXT = scfgExt7;
         REG_SCFG_CLK = 0x187;
@@ -321,20 +329,20 @@ void NdsLoader::Load(BootMode bootMode)
 
     if (Environment::IsDsiMode())
     {
-        if (!_romHeader.IsTwlRom())
-        {
-            DSMode().SwitchToDSMode(_romHeader.ntrHeader.gameCode);
-        }
-        else
+        if (_romHeader.IsTwlRom())
         {
             if (!(_romHeader.twlFlags2 & 1))
             {
-                DSMode().SwitchToDSTouchAndSoundMode(_romHeader.ntrHeader.gameCode);
+                DSMode().SwitchToDSTouchAndSoundMode(_romHeader.gameCode);
             }
 
             // Set back power button handling to irq mode
             mcu_writeReg(MCU_REG_MODE, 1);
         }
+        else
+        {
+            DSMode().SwitchToDSMode(_romHeader.gameCode);
+        }
     }
 
     if (isHomebrew)
@@ -349,11 +357,11 @@ void NdsLoader::Load(BootMode bootMode)
 bool NdsLoader::IsCloneBootRom(u32 romOffset)
 {
     bool isCloneBootRom = false;
-    if (_romHeader.ntrHeader.ntrRomSize != 0)
+    if (_romHeader.ntrRomSize != 0)
     {
         UINT bytesRead = 0;
         u16 signatureHeader;
-        if (f_lseek(&_romFile, romOffset + _romHeader.ntrHeader.ntrRomSize) == FR_OK &&
+        if (f_lseek(&_romFile, romOffset + _romHeader.ntrRomSize) == FR_OK &&
             f_read(&_romFile, &signatureHeader, sizeof(signatureHeader), &bytesRead) == FR_OK &&
             bytesRead == 2 &&
             signatureHeader == 0x6361)
@@ -371,7 +379,7 @@ void NdsLoader::InsertArgv()
     u32 argSize = 0;
 
     // Find the address to write argv
-    u32 argDst = ((_romHeader.ntrHeader.arm9LoadAddress + _romHeader.ntrHeader.arm9Size + 3) & ~3) + 4;
+    u32 argDst = ((_romHeader.arm9LoadAddress + _romHeader.arm9Size + 3) & ~3) + 4;
     if (_romHeader.IsTwlRom())
     {
         u32 argDstTwl = ((_romHeader.arm9iLoadAddress + _romHeader.arm9iSize + 3) & ~3) + 4;
@@ -475,8 +483,8 @@ void NdsLoader::SetupSharedMemory(u32 cardId, u32 agbMem, u32 resetParam, u32 ro
     memcpy(TWL_SHARED_MEMORY->ntrSharedMem.romHeader, &_romHeader, sizeof(nds_header_ntr_t));
     *(vu32*)&TWL_SHARED_MEMORY->ntrSharedMem.bootCheckInfo[0] = cardId;
     *(vu32*)&TWL_SHARED_MEMORY->ntrSharedMem.bootCheckInfo[4] = cardId;
-    *(vu16*)&TWL_SHARED_MEMORY->ntrSharedMem.bootCheckInfo[8] = _romHeader.ntrHeader.headerCrc;
-    *(vu16*)&TWL_SHARED_MEMORY->ntrSharedMem.bootCheckInfo[0xA] = _romHeader.ntrHeader.secureAreaCrc;
+    *(vu16*)&TWL_SHARED_MEMORY->ntrSharedMem.bootCheckInfo[8] = _romHeader.headerCrc;
+    *(vu16*)&TWL_SHARED_MEMORY->ntrSharedMem.bootCheckInfo[0xA] = _romHeader.secureAreaCrc;
     *(vu32*)&TWL_SHARED_MEMORY->ntrSharedMem.bootCheckInfo[0x10] = 0x5835; // use correct card id address
     *(vu32*)&TWL_SHARED_MEMORY->ntrSharedMem.isDebuggerData[0x1C] = agbMem;
     TWL_SHARED_MEMORY->ntrSharedMem.resetParam = resetParam;
@@ -534,13 +542,19 @@ void NdsLoader::LoadFirmwareUserSettings()
 
 bool NdsLoader::ShouldAttemptDldiPatch()
 {
-    switch (_romHeader.ntrHeader.gameCode)
+    // Some games contain a fake dldi header to trick flashcards
+    // See also: https://shutterbug2000.github.io/very-clever/
+    switch (_romHeader.gameCode)
     {
-        // Final Fantasy IV contains a fake dldi header to trick flashcards
-        // See also: https://shutterbug2000.github.io/very-clever/
+        // Final Fantasy IV
         case GAMECODE("YF4P"):
         case GAMECODE("YF4E"):
         case GAMECODE("YF4J"):
+        // Final Fantasy Crystal Chronicles - Ring of Fates
+        case GAMECODE("AFXE"):
+        case GAMECODE("AFXP"):
+        // Nanashi no Geemu
+        case GAMECODE("YFQJ"):
         {
             return false;
         }
@@ -602,20 +616,12 @@ bool NdsLoader::TryLoadRomHeader(u32 romOffset)
     return true;
 }
 
-void NdsLoader::HandleCardSave()
-{
-    if (!CardSaveArranger().SetupCardSave(_romHeader.ntrHeader.gameCode, _savePath))
-    {
-        ErrorDisplay().PrintError("Failed to setup save file.");
-    }
-}
-
 void NdsLoader::HandleAntiPiracy()
 {
     auto apList = ApListFactory().CreateFromFile(AP_LIST_PATH);
     if (apList)
     {
-        auto entry = apList->FindEntry(_romHeader.ntrHeader.gameCode, _romHeader.ntrHeader.softwareVersion);
+        auto entry = apList->FindEntry(_romHeader.gameCode, _romHeader.softwareVersion);
         if (entry)
         {
             entry->Dump();
@@ -677,15 +683,15 @@ void NdsLoader::RemapWram()
 
 bool NdsLoader::TryLoadArm9()
 {
-    if (f_lseek(&_romFile, _romHeader.ntrHeader.arm9RomOffset + TWL_SHARED_MEMORY->ntrSharedMem.romOffset) != FR_OK)
+    if (f_lseek(&_romFile, _romHeader.arm9RomOffset + TWL_SHARED_MEMORY->ntrSharedMem.romOffset) != FR_OK)
     {
         LOG_FATAL("Failed to seek to arm9\n");
         return false;
     }
 
     UINT bytesRead = 0;
-    FRESULT result = f_read(&_romFile, (void*)_romHeader.ntrHeader.arm9LoadAddress, _romHeader.ntrHeader.arm9Size, &bytesRead);
-    if (result != FR_OK || bytesRead != _romHeader.ntrHeader.arm9Size)
+    FRESULT result = f_read(&_romFile, (void*)_romHeader.arm9LoadAddress, _romHeader.arm9Size, &bytesRead);
+    if (result != FR_OK || bytesRead != _romHeader.arm9Size)
     {
         LOG_FATAL("Failed to read arm9. Result: %d, bytesRead: %d\n", result, bytesRead);
         return false;
@@ -730,7 +736,7 @@ bool NdsLoader::TryLoadArm9i()
 
 bool NdsLoader::TryDecryptArm9i()
 {
-    if (!(_romHeader.ntrHeader.twlFlags & (1 << 1)))
+    if (!(_romHeader.twlFlags & (1 << 1)))
     {
         return true;
     }
@@ -750,7 +756,7 @@ bool NdsLoader::TryDecryptArm9i()
 
 bool NdsLoader::TryDecryptArm7i()
 {
-    if (!(_romHeader.ntrHeader.twlFlags & (1 << 1)) || _romHeader.modcryptArea2Size == 0)
+    if (!(_romHeader.twlFlags & (1 << 1)) || _romHeader.modcryptArea2Size == 0)
     {
         return true;
     }
@@ -770,15 +776,15 @@ bool NdsLoader::TryDecryptArm7i()
 
 bool NdsLoader::TryLoadArm7()
 {
-    if (f_lseek(&_romFile, _romHeader.ntrHeader.arm7RomOffset + TWL_SHARED_MEMORY->ntrSharedMem.romOffset) != FR_OK)
+    if (f_lseek(&_romFile, _romHeader.arm7RomOffset + TWL_SHARED_MEMORY->ntrSharedMem.romOffset) != FR_OK)
     {
         LOG_FATAL("Failed to seek to arm7\n");
         return false;
     }
 
     UINT bytesRead = 0;
-    FRESULT result = f_read(&_romFile, (void*)_romHeader.ntrHeader.arm7LoadAddress, _romHeader.ntrHeader.arm7Size, &bytesRead);
-    if (result != FR_OK || bytesRead != _romHeader.ntrHeader.arm7Size)
+    FRESULT result = f_read(&_romFile, (void*)_romHeader.arm7LoadAddress, _romHeader.arm7Size, &bytesRead);
+    if (result != FR_OK || bytesRead != _romHeader.arm7Size)
     {
         LOG_FATAL("Failed to read arm7. Result: %d, bytesRead: %d\n", result, bytesRead);
         return false;
@@ -822,19 +828,19 @@ void NdsLoader::HandleDldiPatching()
     }
 
     int arm9DldiAddr = sDldiStubMatcher.FindFirstOccurance(
-        (const u32*)_romHeader.ntrHeader.arm9LoadAddress, _romHeader.ntrHeader.arm9Size >> 2) << 2;
+        (const u32*)_romHeader.arm9LoadAddress, _romHeader.arm9Size >> 2) << 2;
     if (arm9DldiAddr >= 0)
     {
-        dldi_header_t* arm9Dldi = (dldi_header_t*)(_romHeader.ntrHeader.arm9LoadAddress + arm9DldiAddr);
+        dldi_header_t* arm9Dldi = (dldi_header_t*)(_romHeader.arm9LoadAddress + arm9DldiAddr);
         LOG_DEBUG("Dldi found in arm9 at address %p\n", arm9Dldi);
         dldi_patchTo(arm9Dldi);
     }
 
     int arm7DldiAddr = sDldiStubMatcher.FindFirstOccurance(
-        (const u32*)_romHeader.ntrHeader.arm7LoadAddress, _romHeader.ntrHeader.arm7Size >> 2) << 2;
+        (const u32*)_romHeader.arm7LoadAddress, _romHeader.arm7Size >> 2) << 2;
     if (arm7DldiAddr >= 0)
     {
-        dldi_header_t* arm7Dldi = (dldi_header_t*)(_romHeader.ntrHeader.arm7LoadAddress + arm7DldiAddr);
+        dldi_header_t* arm7Dldi = (dldi_header_t*)(_romHeader.arm7LoadAddress + arm7DldiAddr);
         LOG_DEBUG("Dldi found in arm7 at address %p\n", arm7Dldi);
         dldi_patchTo(arm7Dldi);
     }
@@ -854,11 +860,15 @@ void NdsLoader::StartRom(BootMode bootMode)
         REG_IF2 = ~0u;
     }
 
-    ((entrypoint_t)_romHeader.ntrHeader.arm7EntryAddress)();
+    ((entrypoint_t)_romHeader.arm7EntryAddress)();
 }
 
 void NdsLoader::SetupTwlConfig()
 {
+    ConsoleRegion romRegion = GetRomRegion(_romHeader.gameCode);
+    // Set language based on rom region, TODO: allow user to override this via some config or so
+    UserLanguage userLang = GetLanguageByRomRegion(romRegion);
+
     twl_config_t* twlConfig = (twl_config_t*)0x02000400;
     *(twl_config_t**)0x02FFFDFC = twlConfig;
     *(vu8*)0x02FFFDFA = 0x80;
@@ -866,7 +876,7 @@ void NdsLoader::SetupTwlConfig()
     memset(twlConfig, 0, sizeof(twl_config_t));
     twlConfig->configFlags = 0x0100000F;
     twlConfig->country = 0x4E;
-    twlConfig->language = TWL_SHARED_MEMORY->ntrSharedMem.firmwareUserData[0x64];
+    twlConfig->language = static_cast<u8>(userLang);
     twlConfig->rtcYear = TWL_SHARED_MEMORY->ntrSharedMem.firmwareUserData[0x66];
     twlConfig->rtcOffset = *(s64*)&TWL_SHARED_MEMORY->ntrSharedMem.firmwareUserData[0x68];
     twlConfig->eulaAgreeVersion[0] = 1;
@@ -874,7 +884,7 @@ void NdsLoader::SetupTwlConfig()
     twlConfig->alarmMinute = TWL_SHARED_MEMORY->ntrSharedMem.firmwareUserData[0x53];
     twlConfig->alarmEnable = TWL_SHARED_MEMORY->ntrSharedMem.firmwareUserData[0x56];
     twlConfig->systemMenuUsedTitleSlots = 9;
-    twlConfig->systemMenuUsedTitleSlots = 30;
+    twlConfig->systemMenuFreeTitleSlots = 30;
     twlConfig->field24 = 3;
     memcpy(&twlConfig->touchCalibrationX1Adc, &TWL_SHARED_MEMORY->ntrSharedMem.firmwareUserData[0x58], 0xC);
     twlConfig->field3C = 0x0201209C;
@@ -900,9 +910,10 @@ void NdsLoader::SetupTwlConfig()
     }
     *(vu16*)0x020005E2 = swi_getCrc16(0xFFFF, (void*)0x020005E4, 0xC);
 
-    *(vu32*)0x02FFFD68 = 0x3E; // supported languages
+    // Set bitmask for supported languages
+    *(vu32*)0x02FFFD68 = GetSupportedLanguagesByRegion(romRegion);
     *(vu32*)0x02FFFD6C = 0;
-    *(vu8*)0x02FFFD70 = 2; // region, 2 = europe
+    *(vu8*)0x02FFFD70 = static_cast<u8>(romRegion); // region
 }
 
 void NdsLoader::SetDeviceListEntry(dsi_devicelist_entry_t& deviceListEntry,
@@ -964,20 +975,20 @@ bool NdsLoader::TrySetupDsiWareSave()
 
 bool NdsLoader::TryDecryptSecureArea()
 {
-    if (_romHeader.ntrHeader.arm9RomOffset < 0x4000 || _romHeader.ntrHeader.arm9RomOffset >= 0x8000)
+    if (_romHeader.arm9RomOffset < 0x4000 || _romHeader.arm9RomOffset >= 0x8000)
     {
         return true;
     }
 
-    if (((u32*)_romHeader.ntrHeader.arm9LoadAddress)[0] == 0xE7FFDEFF &&
-        ((u32*)_romHeader.ntrHeader.arm9LoadAddress)[1] == 0xE7FFDEFF)
+    if (((u32*)_romHeader.arm9LoadAddress)[0] == 0xE7FFDEFF &&
+        ((u32*)_romHeader.arm9LoadAddress)[1] == 0xE7FFDEFF)
     {
         return true;
     }
 
     u16 secureAreaCrc = swi_getCrc16(0xFFFF,
-        (const void*)_romHeader.ntrHeader.arm9LoadAddress, 0x8000 - _romHeader.ntrHeader.arm9RomOffset);
-    if (secureAreaCrc != _romHeader.ntrHeader.secureAreaCrc)
+        (const void*)_romHeader.arm9LoadAddress, 0x8000 - _romHeader.arm9RomOffset);
+    if (secureAreaCrc != _romHeader.secureAreaCrc)
     {
         return true;
     }
@@ -994,14 +1005,122 @@ bool NdsLoader::TryDecryptSecureArea()
     }
 
     auto blowfish = std::make_unique<Blowfish>(keyTable.get());
-    blowfish->TransformTable(_romHeader.ntrHeader.gameCode, 3, 8);
+    blowfish->TransformTable(_romHeader.gameCode, 3, 8);
     blowfish->Decrypt(
-        (const void*)_romHeader.ntrHeader.arm9LoadAddress,
-        (void*)_romHeader.ntrHeader.arm9LoadAddress,
-        0x4800 - _romHeader.ntrHeader.arm9RomOffset);
-    ((u32*)_romHeader.ntrHeader.arm9LoadAddress)[0] = 0xE7FFDEFF;
-    ((u32*)_romHeader.ntrHeader.arm9LoadAddress)[1] = 0xE7FFDEFF;
+        (const void*)_romHeader.arm9LoadAddress,
+        (void*)_romHeader.arm9LoadAddress,
+        0x4800 - _romHeader.arm9RomOffset);
+    ((u32*)_romHeader.arm9LoadAddress)[0] = 0xE7FFDEFF;
+    ((u32*)_romHeader.arm9LoadAddress)[1] = 0xE7FFDEFF;
 
     LOG_DEBUG("Decrypted secure area\n");
     return true;
 }
+
+void NdsLoader::HandleIQueRegionFreePatching()
+{
+    if ((_romHeader.flags & 0x80) == 0x80)
+    {
+        _romHeader.flags &= ~0x80;
+        _romHeader.headerCrc = swi_getCrc16(0xFFFF, (void*)&_romHeader, 0x15E);
+    }
+}
+
+ConsoleRegion NdsLoader::GetRomRegion(u32 gameCode)
+{
+    u8 gameRegionCode = (gameCode >> 24) & 0xFF;
+    if (gameRegionCode != 'A' && gameRegionCode != 'O')
+    {
+        // Determine region by TID
+        if (gameRegionCode == 'J')
+        {
+            return ConsoleRegion::Japan;
+        }
+        else if (gameRegionCode == 'E' || gameRegionCode == 'T')
+        {
+            return ConsoleRegion::America;
+        }
+        else if (gameRegionCode == 'P' || gameRegionCode == 'V')
+        {
+            return ConsoleRegion::Europe;
+        }
+        else if (gameRegionCode == 'U')
+        {
+            return ConsoleRegion::Australia;
+        }
+        else if (gameRegionCode == 'C')
+        {
+            return ConsoleRegion::China;
+        }
+        else if (gameRegionCode== 'K')
+        {
+            return ConsoleRegion::Korea;
+        }
+    }
+
+    return ConsoleRegion::Europe; // Default to EUR
+}
+
+UserLanguage NdsLoader::GetLanguageByRomRegion(ConsoleRegion romRegion)
+{
+    UserLanguage userLang = static_cast<UserLanguage>(TWL_SHARED_MEMORY->ntrSharedMem.firmwareUserData[0x64] & 0x07);
+
+    if (romRegion == ConsoleRegion::Japan)
+    {
+        return UserLanguage::Japanese;
+    }
+    else if (romRegion == ConsoleRegion::America &&
+            (userLang != UserLanguage::English ||
+             userLang != UserLanguage::French ||
+             userLang != UserLanguage::Spanish))
+    {
+        return UserLanguage::English;
+    }
+    else if (romRegion == ConsoleRegion::Europe && userLang < UserLanguage::English && userLang > UserLanguage::Spanish)
+    {
+        return UserLanguage::English;
+    }
+    else if (romRegion == ConsoleRegion::China)
+    {
+        return UserLanguage::Chinese;
+    }
+    else if (romRegion == ConsoleRegion::Korea)
+    {
+        return UserLanguage::Korean;
+    }
+
+    return userLang;
+}
+
+u32 NdsLoader::GetSupportedLanguagesByRegion(ConsoleRegion region)
+{
+    switch (region)
+    {
+        case ConsoleRegion::Japan:
+        {
+            return 0x01;
+        }
+        case ConsoleRegion::America:
+        {
+            return 0x26;
+        }
+        case ConsoleRegion::Europe:
+        {
+            return 0x3E;
+        }
+        case ConsoleRegion::Australia:
+        {
+            return 0x02;
+        }
+        case ConsoleRegion::China:
+        {
+            return 0x40;
+        }
+        case ConsoleRegion::Korea:
+        {
+            return 0x80;
+        }
+    }
+
+    return 0x3E;
+}

arm7/source/loader/NdsLoader.h

@@ -3,6 +3,8 @@
 #include "ndsHeader.h"
 #include "DsiWareSaveArranger.h"
 #include "BootMode.h"
+#include "ConsoleRegion.h"
+#include "UserLanguage.h"
 
 struct dsi_devicelist_entry_t;
 
@@ -54,7 +56,6 @@ private:
     void ClearMainMemory();
     void CreateRomClusterTable();
     bool TryLoadRomHeader(u32 romOffset);
-    void HandleCardSave();
     void HandleAntiPiracy();
     void RemapWram();
     bool TryLoadArm9();
@@ -72,4 +73,8 @@ private:
     void InsertArgv();
     bool TrySetupDsiWareSave();
     bool TryDecryptSecureArea();
+    void HandleIQueRegionFreePatching();
+    ConsoleRegion GetRomRegion(u32 gameCode);
+    UserLanguage GetLanguageByRomRegion(ConsoleRegion romRegion);
+    u32 GetSupportedLanguagesByRegion(ConsoleRegion region);
 };

arm7/source/loader/SaveList.h

@@ -7,13 +7,13 @@
 class SaveListEntry
 {
     u32 gameCode;
-    u8 saveType; // see CardSaveType
+    CardSaveType saveType;
     u8 saveSize; // 0 or 1 << x
     u8 reserved[2]; // for possible future use
 
 public:
     u32 GetGameCode() const { return gameCode; }
-    CardSaveType GetSaveType() const { return static_cast<CardSaveType>(saveType); }
+    CardSaveType GetSaveType() const { return saveType; }
     u32 GetSaveSize() const { return saveSize == 0 ? 0 : (1u << saveSize); }
 
     void Dump() const

arm7/source/loader/TwlAes.cpp

@@ -104,7 +104,7 @@ void TwlAes::DecryptModuleAes(void* data, u32 length, const aes_u128_t* iv) cons
 
 void TwlAes::SetupModuleKeyXY(const nds_header_twl_t* romHeader) const
 {
-    if ((romHeader->ntrHeader.twlFlags & (1 << 2)) || (romHeader->twlFlags2 & (1 << 7)))
+    if ((romHeader->twlFlags & (1 << 2)) || (romHeader->twlFlags2 & (1 << 7)))
     {
         // debug
         aes_setKey(KEY_SLOT_MODULE, (const aes_u128_t*)romHeader);
@@ -116,8 +116,8 @@ void TwlAes::SetupModuleKeyXY(const nds_header_twl_t* romHeader) const
         {
             MODULE_KEYX_NINT,
             MODULE_KEYX_ENDO,
-            romHeader->ntrHeader.gameCode,
-            __builtin_bswap32(romHeader->ntrHeader.gameCode)
+            romHeader->gameCode,
+            __builtin_bswap32(romHeader->gameCode)
         }};
         aes_setKeyXY(KEY_SLOT_MODULE, &keyX, (const aes_u128_t*)romHeader->arm9iSha1Hmac);
     }

arm7/source/loader/UserLanguage.h

@@ -0,0 +1,14 @@
+#pragma once
+
+/// @brief Enum for DSi user language.
+enum class UserLanguage
+{
+    Japanese,
+    English,
+    French,
+    German,
+    Italian,
+    Spanish,
+    Chinese,
+    Korean
+};

arm9/source/Arm7Patcher.cpp

@@ -49,15 +49,18 @@ void* Arm7Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform) const
         patchCollection.AddPatch(arm7ArenaPatch);
 
         if (romHeader->unitCode == 0) // seems only present on NITRO, not on HYBRID or LIMITED
+        {
             patchCollection.AddPatch(new DisableArm7WramClearPatch());
+        }
 
         if (sdkVersion.IsTwlSdk())
         {
-            if (gIsDsiMode && romHeader->IsTwlRom() && twlRomHeader->IsDsiWare())
+            if (gIsDsiMode && (twlRomHeader->HasNandAccess() || twlRomHeader->HasSdAccess()))
             {
                 patchCollection.AddPatch(new Sdk5DsiSdCardRedirectPatch());
             }
-            else
+
+            if (!twlRomHeader->IsDsiWare())
             {
                 patchCollection.AddPatch(new CardiDoTaskFromArm9Patch());
             }

arm9/source/Arm9Patcher.cpp

@@ -12,10 +12,17 @@
 #include "patches/arm9/CardiReadRomIdCorePatch.h"
 #include "patches/arm9/OSResetSystemPatch.h"
 #include "patches/arm9/PokemonDownloaderArm9Patch.h"
+#include "patches/arm9/DSProtectArm9Patch.h"
+#include "patches/arm9/NandSave/FaceTrainingNandSavePatch.h"
+#include "patches/arm9/NandSave/JamWithTheBandNandSavePatch.h"
+#include "patches/arm9/NandSave/NintendoDSGuideNandSavePatch.h"
+#include "patches/arm9/NandSave/WarioWareDiyNandSavePatch.h"
 #include "patches/arm9/OverlayPatches/FsStartOverlayHookPatch.h"
 #include "patches/arm9/OverlayPatches/DSProtectPatches/DSProtectOverlayPatch.h"
-#include "patches/arm9/OverlayPatches/PokemonBw1/PokemonBw1IrApPatch.h"
-#include "patches/arm9/OverlayPatches/PokemonBw2/PokemonBw2IrApPatch.h"
+#include "patches/arm9/OverlayPatches/DSProtectPatches/DSProtectPuyoPuyo7Patch.h"
+#include "patches/arm9/OverlayPatches/PokemonIr/PokemonIrApPatch.h"
+#include "patches/arm9/OverlayPatches/KirbySuperStarUltra/KirbySuperStarUltraPatch.h"
+#include "patches/arm9/OverlayPatches/RabbidsGoHome/RabbidsGoHomePatch.h"
 #include "patches/arm9/OverlayPatches/GoldenSunDarkDawn/GoldenSunDarkDawnOverlayHookPatch.h"
 #include "SecureSysCallsUnusedSpaceLocator.h"
 #include "fastSearch.h"
@@ -33,9 +40,9 @@
 
 typedef void (*uncompress_func_t)(void* compressedEnd);
 
-static const u32 sMiiUncompressBackwardPatternOld[] = { 0xE3500000, 0x0A000025, 0xE92D00F0, 0xE9100006 }; // mkds beta; version 0x2012774
-static const u32 sMiiUncompressBackwardPatternOld2[] = { 0xE3500000, 0x0A00002B, 0xE92D00F0, 0xE9100006 }; // asterix & obelix xxl 2; version 0x3017531
-static const u32 sMiiUncompressBackwardPattern[] = { 0xE3500000, 0x0A000027, 0xE92D00F0, 0xE9100006 }; // mkds
+static const u32 sMiiUncompressBackwardPatternOld[] = { 0xE3500000, 0x0A000025, 0xE92D00F0, 0xE9100006 };
+static const u32 sMiiUncompressBackwardPatternOld2[] = { 0xE3500000, 0x0A00002B, 0xE92D00F0, 0xE9100006 };
+static const u32 sMiiUncompressBackwardPattern[] = { 0xE3500000, 0x0A000027, 0xE92D00F0, 0xE9100006 };
 static const u32 sMiiUncompressBackwardPatternHybrid[] = { 0xE3500000, 0x0A000029, 0xE92D01F0, 0xE9100006 };
 
 void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApListEntry* apListEntry,
@@ -43,13 +50,11 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
 {
     auto romHeader = (const nds_header_ntr_t*)TWL_SHARED_MEMORY->ntrSharedMem.romHeader;
     auto twlRomHeader = (const nds_header_twl_t*)TWL_SHARED_MEMORY->twlRomHeader;
-    ModuleParamsLocator moduleParamsLocator;
-    auto moduleParams = moduleParamsLocator.FindModuleParams(romHeader);
     u32 arm9Size = romHeader->arm9Size;
     u32 arm9iSize = romHeader->IsTwlRom() ? twlRomHeader->arm9iSize : 0;
-    SdkVersion sdkVersion = moduleParams ? moduleParams->sdkVersion : 0u;
     u32 compressedEnd = 0;
-    PatchCollection patchCollection;
+    auto moduleParams = ModuleParamsLocator().FindModuleParams(romHeader);
+    SdkVersion sdkVersion = moduleParams ? moduleParams->sdkVersion : 0u;
     if (moduleParams)
     {
         LOG_DEBUG("Module params found at 0x%p\n", moduleParams);
@@ -57,18 +62,7 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
         const u32* miiUncompressBackward = nullptr;
         if (moduleParams->compressedEnd)
         {
-            const u32* miiUncompressBackwardPattern;
-            if (sdkVersion <= 0x2017532)
-                miiUncompressBackwardPattern = sMiiUncompressBackwardPatternOld;
-            else
-                miiUncompressBackwardPattern = sMiiUncompressBackwardPattern;
-
-            miiUncompressBackward = fastSearch16((const u32*)romHeader->arm9LoadAddress, 0x1000, miiUncompressBackwardPattern);
-            if (!sdkVersion.IsTwlSdk() && !miiUncompressBackward)
-                miiUncompressBackward = fastSearch16((const u32*)romHeader->arm9LoadAddress, 0x1000, sMiiUncompressBackwardPatternOld2);
-            if (sdkVersion.IsTwlSdk() && !miiUncompressBackward)
-                miiUncompressBackward = fastSearch16((const u32*)romHeader->arm9LoadAddress, 0x1000, sMiiUncompressBackwardPatternHybrid);
-
+            miiUncompressBackward = FindMIiUncompressBackward(romHeader->arm9LoadAddress, sdkVersion);
             if (miiUncompressBackward)
             {
                 arm9Size = moduleParams->compressedEnd + *(u32*)(moduleParams->compressedEnd - 4) - romHeader->arm9LoadAddress;
@@ -86,22 +80,20 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
         {
             auto arm9iModuleParams = (module_params_twl_t*)(romHeader->arm9LoadAddress + twlRomHeader->arm9iModuleParamsAddress);
             if (arm9iModuleParams->magicBigEndian == MODULE_PARAMS_TWL_MAGIC_BE &&
-                arm9iModuleParams->magicLittleEndian == MODULE_PARAMS_TWL_MAGIC_LE)
+                arm9iModuleParams->magicLittleEndian == MODULE_PARAMS_TWL_MAGIC_LE &&
+                arm9iModuleParams->compressedEnd != 0)
             {
-                if (arm9iModuleParams->compressedEnd)
+                LOG_DEBUG("Compressed arm9i found\n");
+                if (miiUncompressBackward)
                 {
-                    LOG_DEBUG("Compressed arm9i found\n");
-                    if (miiUncompressBackward)
-                    {
-                        arm9iSize = arm9iModuleParams->compressedEnd + *(u32*)(arm9iModuleParams->compressedEnd - 4) - twlRomHeader->arm9iLoadAddress;
-                        ((uncompress_func_t)miiUncompressBackward)((void*)arm9iModuleParams->compressedEnd);
-                        arm9iModuleParams->compressedEnd = 0;
-                        LOG_DEBUG("Decompressed arm9i\n");
-                    }
-                    else
-                    {
-                        LOG_DEBUG("Could not decompress arm9i\n");
-                    }
+                    arm9iSize = arm9iModuleParams->compressedEnd + *(u32*)(arm9iModuleParams->compressedEnd - 4) - twlRomHeader->arm9iLoadAddress;
+                    ((uncompress_func_t)miiUncompressBackward)((void*)arm9iModuleParams->compressedEnd);
+                    arm9iModuleParams->compressedEnd = 0;
+                    LOG_DEBUG("Decompressed arm9i\n");
+                }
+                else
+                {
+                    LOG_DEBUG("Could not decompress arm9i\n");
                 }
             }
         }
@@ -126,6 +118,7 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
         romHeader->gameCode,
         loaderPlatform
     };
+    PatchCollection patchCollection;
     if (sdkVersion != 0)
     {
         if (*(vu32*)0x02FFF00C == GAMECODE("ADAJ") &&
@@ -154,14 +147,13 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
             }
             else
             {
-                SecureSysCallsUnusedSpaceLocator secureSysCallsUnusedSpaceLocator;
-                secureSysCallsUnusedSpaceLocator.FindUnusedSpace(romHeader, patchContext.GetPatchHeap());
+                SecureSysCallsUnusedSpaceLocator().FindUnusedSpace(romHeader, patchContext.GetPatchHeap());
             }
         }
 
         if (sdkVersion.IsTwlSdk())
         {
-            if (!(romHeader->IsTwlRom() && twlRomHeader->IsDsiWare()))
+            if (!twlRomHeader->IsDsiWare())
             {
                 // if ((romHeader->unitCode & 3) != 3)
                 {
@@ -169,7 +161,7 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
                 }
                 patchCollection.AddPatch(new CardiReadRomWithCpuPatch());
 
-                if (gIsDsiMode && (romHeader->unitCode & 2))
+                if (gIsDsiMode && romHeader->IsTwlRom())
                 {
                     patchCollection.AddPatch(new CardiReadCardWithHashInternalAsyncPatch());
                 }
@@ -182,98 +174,8 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
         }
 
         patchCollection.AddPatch(new CardiReadRomIdCorePatch());
-
         patchCollection.AddPatch(new OSResetSystemPatch(loaderInfo));
-
-        OverlayHookPatch* overlayHookPatch;
-        if (romHeader->gameCode == GAMECODE("BO5P") ||
-            romHeader->gameCode == GAMECODE("BO5E") ||
-            romHeader->gameCode == GAMECODE("BO5J"))
-        {
-            overlayHookPatch = new GoldenSunDarkDawnOverlayHookPatch();
-            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(334, 0, DSProtectVersion::v2_01, ~0u));
-            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(335, 0, DSProtectVersion::v2_01s, ~0u));
-        }
-        else
-        {
-            overlayHookPatch = new FsStartOverlayHookPatch();
-            if (apListEntry)
-            {
-                u32 regularOverlayId = apListEntry->GetRegularOverlayId();
-                if (regularOverlayId != AP_LIST_OVERLAY_ID_INVALID)
-                {
-                    if (regularOverlayId == AP_LIST_OVERLAY_ID_STATIC_ARM9)
-                    {
-                        LOG_WARNING("Patching DSProtect in main memory currently not supported\n");
-                    }
-                    else
-                    {
-                        overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(
-                            regularOverlayId, apListEntry->GetRegularOffset(),
-                            apListEntry->GetDSProtectVersion(), apListEntry->GetDSProtectFunctionMask()));
-                    }
-                }
-                u32 sOverlayId = apListEntry->GetSOverlayId();
-                if (sOverlayId != AP_LIST_OVERLAY_ID_INVALID)
-                {
-                    if (sOverlayId == AP_LIST_OVERLAY_ID_STATIC_ARM9)
-                    {
-                        LOG_WARNING("Patching DSProtect in main memory currently not supported\n");
-                    }
-                    else
-                    {
-                        auto version = apListEntry->GetDSProtectVersion();
-                        if (version < DSProtectVersion::v2_00s)
-                        {
-                            version = (DSProtectVersion)((u32)version - (u32)DSProtectVersion::v2_00 + (u32)DSProtectVersion::v2_00s);
-                        }
-                        overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(
-                            sOverlayId, apListEntry->GetSOffset(), version, ~0u));
-                    }
-                }
-            }
-            switch (romHeader->gameCode)
-            {
-                // Pokemon Black & White
-                case GAMECODE("IRAD"):
-                case GAMECODE("IRAF"):
-                case GAMECODE("IRAI"):
-                case GAMECODE("IRAJ"):
-                case GAMECODE("IRAK"):
-                case GAMECODE("IRAO"):
-                case GAMECODE("IRAS"):
-                case GAMECODE("IRBD"):
-                case GAMECODE("IRBF"):
-                case GAMECODE("IRBI"):
-                case GAMECODE("IRBJ"):
-                case GAMECODE("IRBK"):
-                case GAMECODE("IRBO"):
-                case GAMECODE("IRBS"):
-                {
-                    overlayHookPatch->AddOverlayPatch(new PokemonBw1IrApPatch());
-                    break;
-                }
-                // Pokemon Black & White 2
-                // todo: IRDJ and IREJ have two revisions and the first one seems to be different
-                case GAMECODE("IRDD"):
-                case GAMECODE("IRDF"):
-                case GAMECODE("IRDI"):
-                case GAMECODE("IRDK"):
-                case GAMECODE("IRDO"):
-                case GAMECODE("IRDS"):
-                case GAMECODE("IRED"):
-                case GAMECODE("IREF"):
-                case GAMECODE("IREI"):
-                case GAMECODE("IREK"):
-                case GAMECODE("IREO"):
-                case GAMECODE("IRES"):
-                {
-                    overlayHookPatch->AddOverlayPatch(new PokemonBw2IrApPatch());
-                    break;
-                }
-            }
-        }
-        patchCollection.AddPatch(overlayHookPatch);
+        AddGamePatches(patchCollection, romHeader->gameCode, apListEntry);
 
         if (moduleParams && compressedEnd != 0)
         {
@@ -293,6 +195,236 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
     ic_invalidateAll();
 }
 
+const u32* Arm9Patcher::FindMIiUncompressBackward(u32 arm9LoadAddress, SdkVersion sdkVersion) const
+{
+    const u32* miiUncompressBackwardPattern;
+    if (sdkVersion <= 0x2017532)
+    {
+        miiUncompressBackwardPattern = sMiiUncompressBackwardPatternOld;
+    }
+    else
+    {
+        miiUncompressBackwardPattern = sMiiUncompressBackwardPattern;
+    }
+
+    const u32* miiUncompressBackward = fastSearch16((const u32*)arm9LoadAddress, 0x1000, miiUncompressBackwardPattern);
+    if (!sdkVersion.IsTwlSdk() && !miiUncompressBackward)
+    {
+        miiUncompressBackward = fastSearch16((const u32*)arm9LoadAddress, 0x1000, sMiiUncompressBackwardPatternOld2);
+    }
+    if (sdkVersion.IsTwlSdk() && !miiUncompressBackward)
+    {
+        miiUncompressBackward = fastSearch16((const u32*)arm9LoadAddress, 0x1000, sMiiUncompressBackwardPatternHybrid);
+    }
+
+    return miiUncompressBackward;
+}
+
+void Arm9Patcher::AddGamePatches(PatchCollection& patchCollection, u32 gameCode, const ApListEntry* apListEntry) const
+{
+    OverlayHookPatch* overlayHookPatch;
+    if (gameCode == GAMECODE("BO5P") || gameCode == GAMECODE("BO5E") || gameCode == GAMECODE("BO5J"))
+    {
+        overlayHookPatch = new GoldenSunDarkDawnOverlayHookPatch();
+        overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(334, 0, DSProtectVersion::v2_01, ~0u));
+        overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(335, 0, DSProtectVersion::v2_01s, ~0u));
+    }
+    else
+    {
+        overlayHookPatch = new FsStartOverlayHookPatch();
+        if (apListEntry)
+        {
+            AddDSProtectPatches(patchCollection, overlayHookPatch, apListEntry);
+        }
+        AddGameSpecificPatches(patchCollection, overlayHookPatch, gameCode);
+    }
+
+    patchCollection.AddPatch(overlayHookPatch);
+}
+
+void Arm9Patcher::AddDSProtectPatches(
+    PatchCollection& patchCollection, OverlayHookPatch* overlayHookPatch, const ApListEntry* apListEntry) const
+{
+    u32 regularOverlayId = apListEntry->GetRegularOverlayId();
+    if (regularOverlayId != AP_LIST_OVERLAY_ID_INVALID)
+    {
+        if (regularOverlayId == AP_LIST_OVERLAY_ID_STATIC_ARM9)
+        {
+            patchCollection.AddPatch(new DSProtectArm9Patch(
+                apListEntry->GetRegularOffset(), apListEntry->GetDSProtectVersion(),
+                apListEntry->GetDSProtectFunctionMask()));
+        }
+        else
+        {
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(
+                regularOverlayId, apListEntry->GetRegularOffset(),
+                apListEntry->GetDSProtectVersion(), apListEntry->GetDSProtectFunctionMask()));
+        }
+    }
+    u32 sOverlayId = apListEntry->GetSOverlayId();
+    if (sOverlayId != AP_LIST_OVERLAY_ID_INVALID)
+    {
+        auto version = apListEntry->GetDSProtectVersion();
+        if (version < DSProtectVersion::v2_00s)
+        {
+            version = (DSProtectVersion)((u32)version - (u32)DSProtectVersion::v2_00 + (u32)DSProtectVersion::v2_00s);
+        }
+        if (sOverlayId == AP_LIST_OVERLAY_ID_STATIC_ARM9)
+        {
+            patchCollection.AddPatch(new DSProtectArm9Patch(
+                apListEntry->GetSOffset(), version, ~0u));
+        }
+        else
+        {
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(
+                sOverlayId, apListEntry->GetSOffset(), version, ~0u));
+        }
+    }
+}
+
+void Arm9Patcher::AddGameSpecificPatches(
+    PatchCollection& patchCollection, OverlayHookPatch* overlayHookPatch, u32 gameCode) const
+{
+    switch (gameCode)
+    {
+        // Dragon Ball: Origins 2
+        case GAMECODE("BDBE"):
+        {
+            // BDBE;2;1.23;111111;0x1FC;-1;0x0
+            // BDBE;3;1.23;111111;0x47DC;-1;0x0
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(2, 0x1FC, DSProtectVersion::v1_23, ~0u));
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(3, 0x47DC, DSProtectVersion::v1_23, ~0u));
+            break;
+        }
+        case GAMECODE("BDBJ"):
+        {
+            // BDBJ;2;1.23;111111;0x1FC;-1;0x0
+            // BDBJ;3;1.23;111111;0x4C34;-1;0x0
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(2, 0x1FC, DSProtectVersion::v1_23, ~0u));
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(3, 0x4C34, DSProtectVersion::v1_23, ~0u));
+            break;
+        }
+        case GAMECODE("BDBP"):
+        {
+            // BDBP;2;1.23;111111;0x1FC;-1;0x0
+            // BDBP;3;1.23;111111;0x484C;-1;0x0
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(2, 0x1FC, DSProtectVersion::v1_23, ~0u));
+            overlayHookPatch->AddOverlayPatch(new DSProtectOverlayPatch(3, 0x484C, DSProtectVersion::v1_23, ~0u));
+            break;
+        }
+        // Puyo Puyo 7
+        case GAMECODE("BYOJ"):
+        {
+            // BYOJ;9;1.08;100110;1.08;0x21AC;-1;0x0
+            // BYOJ;12;1.08;100101;1.08;0xC568;-1;0x0
+            // BYOJ;14;1.08;010101;1.08;0x13AB8;-1;0x0
+            // BYOJ;15;1.08;010110;1.08;0x16DF0;-1;0x0
+            // BYOJ;19;1.08;011010;1.08;0x17F8;-1;0x0
+            overlayHookPatch->AddOverlayPatch(new DSProtectPuyoPuyo7Patch());
+            break;
+        }
+        // Pokemon HeartGold & SoulSilver
+        case GAMECODE("IPGD"):
+        case GAMECODE("IPGE"):
+        case GAMECODE("IPGF"):
+        case GAMECODE("IPGI"):
+        case GAMECODE("IPGJ"):
+        case GAMECODE("IPGK"):
+        case GAMECODE("IPGS"):
+        case GAMECODE("IPKD"):
+        case GAMECODE("IPKE"):
+        case GAMECODE("IPKF"):
+        case GAMECODE("IPKI"):
+        case GAMECODE("IPKJ"):
+        case GAMECODE("IPKK"):
+        case GAMECODE("IPKS"):
+        {
+            overlayHookPatch->AddOverlayPatch(new PokemonIrApPatch(PokemonIrVersion::Hgss));
+            break;
+        }
+        // Pokemon Black & White
+        case GAMECODE("IRAD"):
+        case GAMECODE("IRAF"):
+        case GAMECODE("IRAI"):
+        case GAMECODE("IRAJ"):
+        case GAMECODE("IRAK"):
+        case GAMECODE("IRAO"):
+        case GAMECODE("IRAS"):
+        case GAMECODE("IRBD"):
+        case GAMECODE("IRBF"):
+        case GAMECODE("IRBI"):
+        case GAMECODE("IRBJ"):
+        case GAMECODE("IRBK"):
+        case GAMECODE("IRBO"):
+        case GAMECODE("IRBS"):
+        {
+            overlayHookPatch->AddOverlayPatch(new PokemonIrApPatch(PokemonIrVersion::Bw1));
+            break;
+        }
+        // Pokemon Black & White 2
+        case GAMECODE("IRDD"):
+        case GAMECODE("IRDF"):
+        case GAMECODE("IRDI"):
+        case GAMECODE("IRDJ"):
+        case GAMECODE("IRDK"):
+        case GAMECODE("IRDO"):
+        case GAMECODE("IRDS"):
+        case GAMECODE("IRED"):
+        case GAMECODE("IREF"):
+        case GAMECODE("IREI"):
+        case GAMECODE("IREJ"):
+        case GAMECODE("IREK"):
+        case GAMECODE("IREO"):
+        case GAMECODE("IRES"):
+        {
+            overlayHookPatch->AddOverlayPatch(new PokemonIrApPatch(PokemonIrVersion::Bw2));
+            break;
+        }
+        // WarioWare: D.I.Y.
+        case GAMECODE("UORE"):
+        case GAMECODE("UORP"):
+        case GAMECODE("UORJ"):
+        {
+            patchCollection.AddPatch(new WarioWareDiyNandSavePatch());
+            break;
+        }
+        // Jam with the Band
+        case GAMECODE("UXBP"):
+        {
+            patchCollection.AddPatch(new JamWithTheBandNandSavePatch());
+            break;
+        }
+        // Face Training
+        case GAMECODE("USKV"):
+        {
+            patchCollection.AddPatch(new FaceTrainingNandSavePatch());
+            break;
+        }
+        // Nintendo DS Guide
+        case GAMECODE("UGDA"):
+        {
+            patchCollection.AddPatch(new NintendoDSGuideNandSavePatch());
+            break;
+        }
+        // Rabbids Go Home
+        case GAMECODE("VRGE"):
+        case GAMECODE("VRGV"):
+        {
+            overlayHookPatch->AddOverlayPatch(new RabbidsGoHomePatch());
+            break;
+        }
+        // Kirby Super Star Ultra
+        case GAMECODE("YKWE"):
+        case GAMECODE("YKWJ"):
+        case GAMECODE("YKWK"):
+        case GAMECODE("YKWP"):
+        {
+            overlayHookPatch->AddOverlayPatch(new KirbySuperStarUltraPatch());
+            break;
+        }
+    }
+}
+
 void Arm9Patcher::AddRestoreCompressedEndPatch(PatchContext& patchContext,
     u32 arm9AutoLoadDoneHookAddress, u32* moduleParamsCompressedEnd, u32 originalCompressedEndValue) const
 {

arm9/source/Arm9Patcher.h

@@ -1,9 +1,12 @@
 #pragma once
 #include "LoaderInfo.h"
+#include "SdkVersion.h"
 
 class ApListEntry;
 class LoaderPlatform;
 class PatchContext;
+class PatchCollection;
+class OverlayHookPatch;
 
 /// @brief Class for patching the arm9 of retail roms.
 class Arm9Patcher
@@ -18,6 +21,12 @@ public:
         bool isCloneBootRom, const loader_info_t* loaderInfo) const;
 
 private:
+    const u32* FindMIiUncompressBackward(u32 arm9LoadAddress, SdkVersion sdkVersion) const;
+    void AddGamePatches(PatchCollection& patchCollection, u32 gameCode, const ApListEntry* apListEntry) const;
+    void AddDSProtectPatches(PatchCollection& patchCollection,
+        OverlayHookPatch* overlayHookPatch, const ApListEntry* apListEntry) const;
+    void AddGameSpecificPatches(PatchCollection& patchCollection,
+        OverlayHookPatch* overlayHookPatch, u32 gameCode) const;
     void AddRestoreCompressedEndPatch(PatchContext& patchContext,
         u32 arm9AutoLoadDoneHookAddress, u32* moduleParamsCompressedEnd, u32 originalCompressedEndValue) const;
     u32 GetAvailableParentSectionSpace() const;

arm9/source/jumpToArm9EntryPoint.h

@@ -0,0 +1,5 @@
+#pragma once
+
+/// @brief Clears all cpu registers and jumps to the specified \p arm9EntryPoint.
+/// @param arm9EntryPoint The arm9 entry point to jump to.
+extern "C" void jumpToArm9EntryPoint(void* arm9EntryPoint);

arm9/source/jumpToArm9EntryPoint.s

@@ -0,0 +1,29 @@
+.section ".itcm", "ax"
+.arm
+
+// r0: arm9EntryPoint
+.global jumpToArm9EntryPoint
+.type jumpToArm9EntryPoint, %function
+jumpToArm9EntryPoint:
+    str r0, entry_point
+    // Clear all registers
+    mov r0, #0
+    mov r1, #0
+    mov r2, #0
+    mov r3, #0
+    mov r4, #0
+    mov r5, #0
+    mov r6, #0
+    mov r7, #0
+    mov r8, #0
+    mov r9, #0
+    mov r10, #0
+    mov r11, #0
+    mov r12, #0
+    mov sp, #0
+    mov lr, #0
+    // Jump to the arm9 entry point
+    ldr pc, entry_point
+
+entry_point:
+    .word 0

arm9/source/main.cpp

@@ -26,8 +26,7 @@
 #include "arm9Clock.h"
 #include "errorDisplay/ErrorDisplay.h"
 #include "LoaderInfo.h"
-
-typedef void (*entrypoint_t)(void);
+#include "jumpToArm9EntryPoint.h"
 
 #define HANDSHAKE_PART0     0xA
 #define HANDSHAKE_PART1     0xB
@@ -109,7 +108,7 @@ static void bootArm9()
     while (gfx_getVCount() == 191);
     REG_IF = ~0u; // final clear of REG_IF bits
     auto romHeader = (const nds_header_ntr_t*)TWL_SHARED_MEMORY->ntrSharedMem.romHeader;
-    ((entrypoint_t)romHeader->arm9EntryAddress)();
+    jumpToArm9EntryPoint((void*)romHeader->arm9EntryAddress);
 }
 
 static void handleInitializeSdCardCommand()
@@ -193,8 +192,8 @@ static void handleGetSdFunctionsCommand()
     {
         auto sdReadPatchCode = sLoaderPlatform->CreateSdReadPatchCode(patchCodeCollection, patchHeap);
         auto sdWritePatchCode = sLoaderPlatform->CreateSdWritePatchCode(patchCodeCollection, patchHeap);
-        *(vu32*)0x037F8000 = (u32)sdReadPatchCode->GetSdReadFunction();
-        *(vu32*)0x037F8004 = (u32)sdWritePatchCode->GetSdWriteFunction();
+        *(vu32*)0x037F8000 = (u32)sdReadPatchCode->GetReadSectorsFunction();
+        *(vu32*)0x037F8004 = (u32)sdWritePatchCode->GetWriteSectorFunction();
         patchCodeCollection.CopyAllToTarget();
     }
     dc_flushAll();
@@ -219,22 +218,15 @@ static void handleBootCommand()
     REG_EXMEMCNT &= ~0x0880; // map ds and gba slot to arm9
     sLoaderPlatform->PrepareRomBoot(sRomDirSector, sRomDirSectorOffset);
     Arm9IoRegisterClearer().ClearNtrIoRegisters(isSdkResetSystem);
+    REG_EXMEMCNT |= 0x0880; // map ds and gba slot to arm7
     auto ntrRomHeader = (const nds_header_ntr_t*)TWL_SHARED_MEMORY->ntrSharedMem.romHeader;
-    if (ntrRomHeader->IsTwlRom())
+    if (gIsDsiMode && ntrRomHeader->IsTwlRom())
     {
-        if (gIsDsiMode)
-        {
-            Arm9IoRegisterClearer().ClearTwlIoRegisters();
-            REG_SCFG_EXT = 0x8307F100;
-            scfg_setArm9Clock(ScfgArm9Clock::Twl134MHz);
-            REG_SCFG_CLK = 0x87;
-            REG_SCFG_RST = 1;
-        }
-        auto twlRomHeader = (const nds_header_twl_t*)TWL_SHARED_MEMORY->twlRomHeader;
-        if (twlRomHeader->IsDsiWare())
-        {
-            REG_EXMEMCNT |= 0x0880; // map ds and gba slot to arm7
-        }
+        Arm9IoRegisterClearer().ClearTwlIoRegisters();
+        REG_SCFG_EXT = 0x8307F100;
+        scfg_setArm9Clock(ScfgArm9Clock::Twl134MHz);
+        REG_SCFG_CLK = 0x87;
+        REG_SCFG_RST = 1;
     }
     bootArm9();
 }

arm9/source/patches/ISectorRemapPatchCode.h

@@ -0,0 +1,13 @@
+#pragma once
+
+/// @brief Interface for sector remapping patch code.
+class ISectorRemapPatchCode
+{
+protected:
+    ISectorRemapPatchCode() { }
+
+public:
+    /// @brief Gets a pointer to the sector remap function in the patch code.
+    /// @return The pointer to the sector remap function.
+    virtual const void* GetRemapFunction() const = 0;
+};