From d67c4f34d110edf3f5d9593f948265ff75fb8111 Mon Sep 17 00:00:00 2001
From: Pokechu22 <Pokechu022@gmail.com>
Date: Mon, 13 Jan 2020 19:48:19 -0800
Subject: [PATCH 1/2] Fix crash when launching gamecube games with MIOS (from
 the Wii menu)

---
 Source/Core/Core/IOS/DI/DI.cpp | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/Source/Core/Core/IOS/DI/DI.cpp b/Source/Core/Core/IOS/DI/DI.cpp
index 5a53e76446..f6d8c249c3 100644
--- a/Source/Core/Core/IOS/DI/DI.cpp
+++ b/Source/Core/Core/IOS/DI/DI.cpp
@@ -526,6 +526,16 @@ std::optional<DI::DIResult> DI::StartImmediateTransfer(const IOCtlRequest& reque
   return {};
 }
 
+static std::shared_ptr<DI> GetDevice()
+{
+  auto ios = IOS::HLE::GetIOS();
+  if (!ios)
+    return nullptr;
+  auto di = ios->GetDeviceByName("/dev/di");
+  // di may be empty, but static_pointer_cast returns empty in that case
+  return std::static_pointer_cast<DI>(di);
+}
+
 void DI::InterruptFromDVDInterface(DVDInterface::DIInterruptType interrupt_type)
 {
   DIResult result;
@@ -544,10 +554,10 @@ void DI::InterruptFromDVDInterface(DVDInterface::DIInterruptType interrupt_type)
     break;
   }
 
-  auto di = IOS::HLE::GetIOS()->GetDeviceByName("/dev/di");
+  auto di = GetDevice();
   if (di)
   {
-    std::static_pointer_cast<DI>(di)->FinishDICommand(result);
+    di->FinishDICommand(result);
   }
   else
   {
@@ -560,9 +570,9 @@ void DI::FinishDICommandCallback(u64 userdata, s64 ticksbehind)
 {
   const DIResult result = static_cast<DIResult>(userdata);
 
-  auto di = IOS::HLE::GetIOS()->GetDeviceByName("/dev/di");
+  auto di = GetDevice();
   if (di)
-    std::static_pointer_cast<DI>(di)->FinishDICommand(result);
+    di->FinishDICommand(result);
   else
     PanicAlert("IOS::HLE::Device::DI: Received interrupt from DI when device wasn't registered!");
 }
@@ -691,12 +701,12 @@ void DI::ChangePartition(const DiscIO::Partition partition)
 
 DiscIO::Partition DI::GetCurrentPartition()
 {
-  auto di = IOS::HLE::GetIOS()->GetDeviceByName("/dev/di");
+  auto di = GetDevice();
   // Note that this function is called in Gamecube mode for UpdateRunningGameMetadata,
   // so both cases are hit in normal circumstances.
   if (!di)
     return DiscIO::PARTITION_NONE;
-  return std::static_pointer_cast<DI>(di)->m_current_partition;
+  return di->m_current_partition;
 }
 
 void DI::InitializeIfFirstTime()

From ddba80133a1a2f0c82d23c10197aa23cfb6f0066 Mon Sep 17 00:00:00 2001
From: Pokechu22 <Pokechu022@gmail.com>
Date: Mon, 13 Jan 2020 19:48:46 -0800
Subject: [PATCH 2/2] Fix launching DTK games with MIOS

---
 Source/Core/Core/IOS/MIOS.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Source/Core/Core/IOS/MIOS.cpp b/Source/Core/Core/IOS/MIOS.cpp
index d7de03d494..e5bb987ea5 100644
--- a/Source/Core/Core/IOS/MIOS.cpp
+++ b/Source/Core/Core/IOS/MIOS.cpp
@@ -34,7 +34,10 @@ static void ReinitHardware()
   // IOS clears mem2 and overwrites it with pseudo-random data (for security).
   std::memset(Memory::m_pEXRAM, 0, Memory::EXRAM_SIZE);
   // MIOS appears to only reset the DI and the PPC.
-  DVDInterface::Reset();
+  // HACK However, resetting DI will reset the DTK config, which is set by the system menu
+  // (and not by MIOS), causing games that use DTK to break.  Perhaps MIOS doesn't actually
+  // reset DI fully, in such a way that the DTK config isn't cleared?
+  // DVDInterface::Reset();
   PowerPC::Reset();
   Wiimote::ResetAllWiimotes();
   // Note: this is specific to Dolphin and is required because we initialised it in Wii mode.