Added detection of DS mode DSiWare. Fixes #95.

arm7/source/loader/CardSaveArranger.cpp

@@ -24,7 +24,7 @@ bool CardSaveArranger::SetupCardSave(const nds_header_ntr_t* header, const TCHAR
     if (header->nandBackupRegionStart != 0)
     {
         saveType = CardSaveType::Nand;
-        u32 blockSize = header->IsTwlRom() ? TWL_NAND_BLOCK_SIZE : NTR_NAND_BLOCK_SIZE;
+        u32 blockSize = header->SupportsDsiMode() ? 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);

arm7/source/loader/NdsLoader.cpp

@@ -187,6 +187,9 @@ void NdsLoader::Load(BootMode bootMode)
         if (bootMode != BootMode::Multiboot)
         {
             if (_romHeader.IsDsiWare())
+            {
+                // There exist DS mode DSiWare applications, which don't have a save file.
+                if (_romHeader.SupportsDsiMode())
                 {
                     if (bootMode == BootMode::SdkResetSystem)
                     {
@@ -201,6 +204,7 @@ void NdsLoader::Load(BootMode bootMode)
                         return;
                     }
                 }
+            }
             else
             {
                 if (bootMode != BootMode::SdkResetSystem)
@@ -231,7 +235,7 @@ void NdsLoader::Load(BootMode bootMode)
 
     if (Environment::IsDsiMode())
     {
-        if (_romHeader.IsTwlRom())
+        if (_romHeader.SupportsDsiMode())
         {
             SetupTwlConfig();
             TwlAes().SetupAes(&_romHeader);
@@ -248,7 +252,7 @@ void NdsLoader::Load(BootMode bootMode)
             return;
         }
 
-        if (Environment::IsDsiMode() && _romHeader.IsTwlRom())
+        if (Environment::IsDsiMode() && _romHeader.SupportsDsiMode())
         {
             if (!TryLoadArm9i())
             {
@@ -271,7 +275,7 @@ void NdsLoader::Load(BootMode bootMode)
             return;
         }
 
-        if (Environment::IsDsiMode() && _romHeader.IsTwlRom())
+        if (Environment::IsDsiMode() && _romHeader.SupportsDsiMode())
         {
             if (!TryLoadArm7i())
             {
@@ -293,7 +297,7 @@ void NdsLoader::Load(BootMode bootMode)
         LOG_DEBUG("Arm7 patches done\n");
     }
 
-    if (Environment::IsDsiMode() && _romHeader.IsTwlRom())
+    if (Environment::IsDsiMode() && _romHeader.SupportsDsiMode())
     {
         SetupDsiDeviceList();
 
@@ -329,7 +333,7 @@ void NdsLoader::Load(BootMode bootMode)
 
     if (Environment::IsDsiMode())
     {
-        if (_romHeader.IsTwlRom())
+        if (_romHeader.SupportsDsiMode())
         {
             if (!(_romHeader.twlFlags2 & 1))
             {
@@ -380,7 +384,7 @@ void NdsLoader::InsertArgv()
 
     // Find the address to write argv
     u32 argDst = ((_romHeader.arm9LoadAddress + _romHeader.arm9Size + 3) & ~3) + 4;
-    if (_romHeader.IsTwlRom())
+    if (_romHeader.SupportsDsiMode())
     {
         u32 argDstTwl = ((_romHeader.arm9iLoadAddress + _romHeader.arm9iSize + 3) & ~3) + 4;
         if (argDstTwl > argDst)
@@ -442,7 +446,7 @@ void NdsLoader::ApplyArm7Patches()
         u32 mbk6 = 0;
         u32 mbk7 = 0;
         u32 mbk8 = 0;
-        if (Environment::IsDsiMode() && _romHeader.IsTwlRom())
+        if (Environment::IsDsiMode() && _romHeader.SupportsDsiMode())
         {
             mbk6 = REG_MBK6;
             mbk7 = REG_MBK7;
@@ -466,7 +470,7 @@ void NdsLoader::ApplyArm7Patches()
             memcpy(patchCode.get(), srcAddress, patchSpaceSize);
         }
 
-        if (Environment::IsDsiMode() && _romHeader.IsTwlRom())
+        if (Environment::IsDsiMode() && _romHeader.SupportsDsiMode())
         {
             REG_MBK6 = mbk6;
             REG_MBK7 = mbk7;
@@ -493,7 +497,7 @@ void NdsLoader::SetupSharedMemory(u32 cardId, u32 agbMem, u32 resetParam, u32 ro
 
     LoadFirmwareUserSettings();
 
-    if (!_romHeader.IsTwlRom())
+    if (!_romHeader.SupportsDsiMode())
     {
         memcpy((void*)0x027FF800, (void*)0x02FFF800, sizeof(shared_memory_ntr_t));
         memcpy((void*)0x023FF800, (void*)0x02FFF800, sizeof(shared_memory_ntr_t));
@@ -505,10 +509,10 @@ void NdsLoader::SetupSharedMemory(u32 cardId, u32 agbMem, u32 resetParam, u32 ro
     {
         strcpy(TWL_SHARED_MEMORY->sysMenuVersionInfoContentId, "00000009");
         TWL_SHARED_MEMORY->sysMenuVersionInfoContentLastInitialCode = 'P'; // europe
+    }
 
     memcpy(TWL_SHARED_MEMORY->twlCardRomHeader, &_romHeader, sizeof(nds_header_twl_t));
     memcpy(TWL_SHARED_MEMORY->twlRomHeader, &_romHeader, sizeof(nds_header_twl_t));
-    }
 }
 
 void NdsLoader::LoadFirmwareUserSettings()
@@ -643,7 +647,7 @@ void NdsLoader::HandleAntiPiracy()
 void NdsLoader::RemapWram()
 {
     mem_unlockAllTwlWram();
-    if (_romHeader.IsTwlRom())
+    if (_romHeader.SupportsDsiMode())
     {
         REG_MBK6 = _romHeader.arm7MbkSettings[0];
         REG_MBK7 = _romHeader.arm7MbkSettings[1];

arm9/source/Arm7Patcher.cpp

@@ -35,8 +35,8 @@ void* Arm7Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform) const
     {
         (void*)romHeader->arm7LoadAddress,
         romHeader->arm7Size,
-        (romHeader->IsTwlRom()) ? (void*)twlRomHeader->arm7iLoadAddress : nullptr,
+        (romHeader->SupportsDsiMode()) ? (void*)twlRomHeader->arm7iLoadAddress : nullptr,
-        (romHeader->IsTwlRom()) ? twlRomHeader->arm7iSize : 0,
+        (romHeader->SupportsDsiMode()) ? twlRomHeader->arm7iSize : 0,
         sdkVersion,
         romHeader->gameCode,
         romHeader->softwareVersion,
@@ -114,7 +114,7 @@ void* Arm7Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform) const
         u32 mbk6 = 0;
         u32 mbk7 = 0;
         u32 mbk8 = 0;
-        if (gIsDsiMode && romHeader->IsTwlRom())
+        if (gIsDsiMode && romHeader->SupportsDsiMode())
         {
             mbk6 = REG_MBK6;
             mbk7 = REG_MBK7;
@@ -133,7 +133,7 @@ void* Arm7Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform) const
         ic_invalidateAll();
 
         // If in DSi mode and the rom is a DSi rom, restore twl wram.
-        if (gIsDsiMode && romHeader->IsTwlRom())
+        if (gIsDsiMode && romHeader->SupportsDsiMode())
         {
             REG_MBK6 = mbk6;
             REG_MBK7 = mbk7;

arm9/source/Arm9Patcher.cpp

@@ -51,7 +51,7 @@ 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;
     u32 arm9Size = romHeader->arm9Size;
-    u32 arm9iSize = romHeader->IsTwlRom() ? twlRomHeader->arm9iSize : 0;
+    u32 arm9iSize = romHeader->SupportsDsiMode() ? twlRomHeader->arm9iSize : 0;
     u32 compressedEnd = 0;
     auto moduleParams = ModuleParamsLocator().FindModuleParams(romHeader);
     SdkVersion sdkVersion = moduleParams ? moduleParams->sdkVersion : 0u;
@@ -76,7 +76,7 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
             }
         }
 
-        if (gIsDsiMode && romHeader->IsTwlRom())
+        if (gIsDsiMode && romHeader->SupportsDsiMode())
         {
             auto arm9iModuleParams = (module_params_twl_t*)(romHeader->arm9LoadAddress + twlRomHeader->arm9iModuleParamsAddress);
             if (arm9iModuleParams->magicBigEndian == MODULE_PARAMS_TWL_MAGIC_BE &&
@@ -112,7 +112,7 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
     {
         (void*)romHeader->arm9LoadAddress,
         arm9Size,
-        romHeader->IsTwlRom() ? (void*)twlRomHeader->arm9iLoadAddress : nullptr,
+        romHeader->SupportsDsiMode() ? (void*)twlRomHeader->arm9iLoadAddress : nullptr,
         arm9iSize,
         sdkVersion,
         romHeader->gameCode,
@@ -155,14 +155,11 @@ void Arm9Patcher::ApplyPatches(const LoaderPlatform* loaderPlatform, const ApLis
         if (sdkVersion.IsTwlSdk())
         {
             if (!twlRomHeader->IsDsiWare())
-            {
-                // if ((romHeader->unitCode & 3) != 3)
             {
                 patchCollection.AddPatch(new CardiIsRomDmaAvailablePatch());
-                }
                 patchCollection.AddPatch(new CardiReadRomWithCpuPatch());
 
-                if (gIsDsiMode && romHeader->IsTwlRom())
+                if (gIsDsiMode && romHeader->SupportsDsiMode())
                 {
                     patchCollection.AddPatch(new CardiReadCardWithHashInternalAsyncPatch());
                 }

arm9/source/main.cpp

@@ -220,7 +220,7 @@ static void handleBootCommand()
     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 (gIsDsiMode && ntrRomHeader->IsTwlRom())
+    if (gIsDsiMode && ntrRomHeader->SupportsDsiMode())
     {
         Arm9IoRegisterClearer().ClearTwlIoRegisters();
         REG_SCFG_EXT = 0x8307F100;

common/ndsHeader.h

@@ -1,6 +1,9 @@
 #pragma once
 #include <nds/ndstypes.h>
 
+#define NDS_HEADER_UNIT_CODE_NOT_SUPPORTS_DS_MODE   (1 << 0)
+#define NDS_HEADER_UNIT_CODE_SUPPORTS_DSI_MODE      (1 << 1)
+
 struct nds_header_ntr_t
 {
     u8 gameTitle[12];
@@ -55,9 +58,9 @@ struct nds_header_ntr_t
     u32 debugRomLoadAddress; // and arm9 entry
     u32 debugRomArm7EntryAddress;
 
-    constexpr bool IsTwlRom() const
+    constexpr bool SupportsDsiMode() const
     {
-        return unitCode & 2;
+        return unitCode & NDS_HEADER_UNIT_CODE_SUPPORTS_DSI_MODE;
     }
 };
 
@@ -134,29 +137,32 @@ struct nds_header_twl_t : public nds_header_ntr_t
     u8 gapF00[0x80];
     u8 headerRsaSha1Signature[0x80];
 
+    /// @brief Returns if this is a DSiWare application. Note that this does not imply that the app runs in DSi mode.
+    /// @return \c true when this is a DSiWare application, or \c false otherwise.
     constexpr bool IsDsiWare() const
     {
-        return IsTwlRom() && ((titleId >> 32) & 4) != 0;
+        // Do not use SupportsDsiMode() here, because there exist DS mode DSiWare applications.
+        return (twlFlags & 1) != 0 && ((titleId >> 32) & 4) != 0;
     }
 
     constexpr bool HasSdAccess() const
     {
-        return IsTwlRom() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_SD_ACCESS) != 0;
+        return SupportsDsiMode() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_SD_ACCESS) != 0;
     }
 
     constexpr bool HasNandAccess() const
     {
-        return IsTwlRom() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_NAND_ACCESS) != 0;
+        return SupportsDsiMode() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_NAND_ACCESS) != 0;
     }
 
     constexpr bool HasShared2Access() const
     {
-        return IsTwlRom() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_SHARED2_ACCESS) != 0;
+        return SupportsDsiMode() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_SHARED2_ACCESS) != 0;
     }
 
     constexpr bool HasSslCertAccess() const
     {
-        return IsTwlRom() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_SSLCERT_ACCESS) != 0;
+        return SupportsDsiMode() && (accessControl & NDS_HEADER_TWL_ACCESS_CONTROL_SSLCERT_ACCESS) != 0;
     }
 };