diff --git a/.gitignore b/.gitignore
index c10b38da..67a268aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,6 +39,7 @@ bin/sdcard/*
 bin/screenshots/*
 bin/dump/*
 bin/cafeLibs/*
+bin/portable/*
 bin/keys.txt
 
 !bin/shaderCache/info.txt
diff --git a/src/Cafe/OS/common/OSCommon.cpp b/src/Cafe/OS/common/OSCommon.cpp
index a4410028..5297f201 100644
--- a/src/Cafe/OS/common/OSCommon.cpp
+++ b/src/Cafe/OS/common/OSCommon.cpp
@@ -221,5 +221,5 @@ void osLib_load()
 	nsyskbd::nsyskbd_load();
 	swkbd::load();
 	camera::load();
-	procui_load();
+	proc_ui::load();
 }
diff --git a/src/Cafe/OS/libs/coreinit/coreinit.cpp b/src/Cafe/OS/libs/coreinit/coreinit.cpp
index 660f874f..e18d0e8d 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit.cpp
+++ b/src/Cafe/OS/libs/coreinit/coreinit.cpp
@@ -179,27 +179,6 @@ void coreinitExport_OSGetSharedData(PPCInterpreter_t* hCPU)
 	osLib_returnFromFunction(hCPU, 1);
 }
 
-typedef struct
-{
-	MPTR getDriverName;
-	MPTR ukn04;
-	MPTR onAcquiredForeground;
-	MPTR onReleaseForeground;
-	MPTR ukn10;
-}OSDriverCallbacks_t;
-
-void coreinitExport_OSDriver_Register(PPCInterpreter_t* hCPU)
-{
-#ifdef CEMU_DEBUG_ASSERT
-	cemuLog_log(LogType::Force, "OSDriver_Register(0x{:08x},0x{:08x},0x{:08x},0x{:08x},0x{:08x},0x{:08x})", hCPU->gpr[3], hCPU->gpr[4], hCPU->gpr[5], hCPU->gpr[6], hCPU->gpr[7], hCPU->gpr[8]);
-#endif
-	OSDriverCallbacks_t* driverCallbacks = (OSDriverCallbacks_t*)memory_getPointerFromVirtualOffset(hCPU->gpr[5]);
-
-	// todo
-
-	osLib_returnFromFunction(hCPU, 0);
-}
-
 namespace coreinit
 {
 	sint32 OSGetCoreId()
@@ -379,7 +358,6 @@ void coreinit_load()
 	coreinit::miscInit();
 	osLib_addFunction("coreinit", "OSGetSharedData", coreinitExport_OSGetSharedData);
 	osLib_addFunction("coreinit", "UCReadSysConfig", coreinitExport_UCReadSysConfig);
-	osLib_addFunction("coreinit", "OSDriver_Register", coreinitExport_OSDriver_Register);
 
 	// async callbacks
 	InitializeAsyncCallback();
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_DynLoad.h b/src/Cafe/OS/libs/coreinit/coreinit_DynLoad.h
index 0be8226c..2a3172c7 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_DynLoad.h
+++ b/src/Cafe/OS/libs/coreinit/coreinit_DynLoad.h
@@ -2,6 +2,12 @@
 
 namespace coreinit
 {
+	enum class RplEntryReason
+	{
+		Loaded = 1,
+		Unloaded = 2,
+	};
+
 	uint32 OSDynLoad_SetAllocator(MPTR allocFunc, MPTR freeFunc);
 	void OSDynLoad_SetTLSAllocator(MPTR allocFunc, MPTR freeFunc);
 	uint32 OSDynLoad_GetAllocator(betype<MPTR>* funcAlloc, betype<MPTR>* funcFree);
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_FS.cpp b/src/Cafe/OS/libs/coreinit/coreinit_FS.cpp
index a007f5ee..0ca8fb8e 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_FS.cpp
+++ b/src/Cafe/OS/libs/coreinit/coreinit_FS.cpp
@@ -837,7 +837,7 @@ namespace coreinit
 
 	FSAsyncResult* FSGetAsyncResult(OSMessage* msg)
 	{
-		return (FSAsyncResult*)memory_getPointerFromVirtualOffset(_swapEndianU32(msg->message));
+		return (FSAsyncResult*)memory_getPointerFromVirtualOffset(msg->message);
 	}
 
 	sint32 __FSProcessAsyncResult(FSClient_t* fsClient, FSCmdBlock_t* fsCmdBlock, sint32 fsStatus, uint32 errHandling)
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Memory.cpp b/src/Cafe/OS/libs/coreinit/coreinit_Memory.cpp
index 4b147473..cff4ee2b 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Memory.cpp
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Memory.cpp
@@ -126,7 +126,7 @@ namespace coreinit
 		return physicalAddr;
 	}
 
-	void OSMemoryBarrier(PPCInterpreter_t* hCPU)
+	void OSMemoryBarrier()
 	{
 		// no-op
 	}
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Memory.h b/src/Cafe/OS/libs/coreinit/coreinit_Memory.h
index cfb3ed06..0a212f61 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Memory.h
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Memory.h
@@ -5,4 +5,9 @@ namespace coreinit
 	void InitializeMemory();
 
 	void OSGetMemBound(sint32 memType, MPTR* offsetOutput, uint32* sizeOutput);
+
+	void* OSBlockMove(MEMPTR<void> dst, MEMPTR<void> src, uint32 size, bool flushDC);
+	void* OSBlockSet(MEMPTR<void> dst, uint32 value, uint32 size);
+
+	void OSMemoryBarrier();
 }
\ No newline at end of file
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.cpp b/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.cpp
index 6e6a7bc1..cbcfa4d1 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.cpp
+++ b/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.cpp
@@ -3,6 +3,8 @@
 
 namespace coreinit
 {
+	void UpdateSystemMessageQueue();
+	void HandleReceivedSystemMessage(OSMessage* msg);
 
 	SysAllocator<OSMessageQueue> g_systemMessageQueue;
 	SysAllocator<OSMessage, 16> _systemMessageQueueArray;
@@ -27,6 +29,9 @@ namespace coreinit
 
 	bool OSReceiveMessage(OSMessageQueue* msgQueue, OSMessage* msg, uint32 flags)
 	{
+		bool isSystemMessageQueue = (msgQueue == g_systemMessageQueue);
+		if(isSystemMessageQueue)
+			UpdateSystemMessageQueue();
 		__OSLockScheduler(msgQueue);
 		while (msgQueue->usedCount == (uint32be)0)
 		{
@@ -50,6 +55,8 @@ namespace coreinit
 		if (!msgQueue->threadQueueSend.isEmpty())
 			msgQueue->threadQueueSend.wakeupSingleThreadWaitQueue(true);
 		__OSUnlockScheduler(msgQueue);
+		if(isSystemMessageQueue)
+			HandleReceivedSystemMessage(msg);
 		return true;
 	}
 
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.h b/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.h
index 6741ab84..35fdc3e7 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.h
+++ b/src/Cafe/OS/libs/coreinit/coreinit_MessageQueue.h
@@ -3,12 +3,21 @@
 
 namespace coreinit
 {
+	enum class SysMessageId : uint32
+	{
+		MsgAcquireForeground = 0xFACEF000,
+		MsgReleaseForeground = 0xFACEBACC,
+		MsgExit = 0xD1E0D1E0,
+		HomeButtonDenied = 0xCCC0FFEE,
+		NetIoStartOrStop = 0xAAC0FFEE,
+	};
+
 	struct OSMessage
 	{
-		MPTR           message;
-		uint32         data0;
-		uint32         data1;
-		uint32         data2;
+		uint32be		message;
+		uint32be		data0;
+		uint32be		data1;
+		uint32be		data2;
 	};
 
 	struct OSMessageQueue
@@ -36,5 +45,7 @@ namespace coreinit
 	bool OSPeekMessage(OSMessageQueue* msgQueue, OSMessage* msg);
 	sint32 OSSendMessage(OSMessageQueue* msgQueue, OSMessage* msg, uint32 flags);
 
+	OSMessageQueue* OSGetSystemMessageQueue();
+
 	void InitializeMessageQueue();
 };
\ No newline at end of file
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Misc.cpp b/src/Cafe/OS/libs/coreinit/coreinit_Misc.cpp
index 2d7468cf..e2b50661 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Misc.cpp
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Misc.cpp
@@ -1,5 +1,6 @@
 #include "Cafe/OS/common/OSCommon.h"
 #include "Cafe/OS/libs/coreinit/coreinit_Misc.h"
+#include "Cafe/OS/libs/coreinit/coreinit_MessageQueue.h"
 #include "Cafe/CafeSystem.h"
 #include "Cafe/Filesystem/fsc.h"
 #include <pugixml.hpp>
@@ -371,6 +372,23 @@ namespace coreinit
 		return true;
 	}
 
+	uint32 OSGetPFID()
+	{
+		return 15; // hardcoded as game
+	}
+
+	uint32 OSGetUPID()
+	{
+		return OSGetPFID();
+	}
+
+	uint64 s_currentTitleId;
+
+	uint64 OSGetTitleID()
+	{
+		return s_currentTitleId;
+	}
+
 	uint32 s_sdkVersion;
 
 	uint32 __OSGetProcessSDKVersion()
@@ -470,9 +488,78 @@ namespace coreinit
 		return 0;
 	}
 
+	void OSReleaseForeground()
+	{
+		cemuLog_logDebug(LogType::Force, "OSReleaseForeground not implemented");
+	}
+
+	bool s_transitionToBackground = false;
+	bool s_transitionToForeground = false;
+
+	void StartBackgroundForegroundTransition()
+	{
+		s_transitionToBackground = true;
+		s_transitionToForeground = true;
+	}
+
+	// called at the beginning of OSReceiveMessage if the queue is the system message queue
+	void UpdateSystemMessageQueue()
+	{
+		if(!OSIsInterruptEnabled())
+			return;
+		cemu_assert_debug(!__OSHasSchedulerLock());
+		// normally syscall 0x2E is used to get the next message
+		// for now we just have some preliminary logic here to allow a fake transition to background & foreground
+		if(s_transitionToBackground)
+		{
+			// add transition to background message
+			OSMessage msg{};
+			msg.data0 = stdx::to_underlying(SysMessageId::MsgReleaseForeground);
+			msg.data1 = 0; // 1 -> System is shutting down 0 -> Begin transitioning to background
+			OSMessageQueue* systemMessageQueue = coreinit::OSGetSystemMessageQueue();
+			if(OSSendMessage(systemMessageQueue, &msg, 0))
+				s_transitionToBackground = false;
+			return;
+		}
+		if(s_transitionToForeground)
+		{
+			// add transition to foreground message
+			OSMessage msg{};
+			msg.data0 = stdx::to_underlying(SysMessageId::MsgAcquireForeground);
+			msg.data1 = 1; // ?
+			msg.data2 = 1; // ?
+			OSMessageQueue* systemMessageQueue = coreinit::OSGetSystemMessageQueue();
+			if(OSSendMessage(systemMessageQueue, &msg, 0))
+				s_transitionToForeground = false;
+			return;
+		}
+	}
+
+	// called when OSReceiveMessage returns a message from the system message queue
+	void HandleReceivedSystemMessage(OSMessage* msg)
+	{
+		cemu_assert_debug(!__OSHasSchedulerLock());
+		cemuLog_log(LogType::Force, "Receiving message: {:08x}", (uint32)msg->data0);
+	}
+
+	uint32 OSDriver_Register(uint32 moduleHandle, sint32 priority, OSDriverInterface* driverCallbacks, sint32 driverId, uint32be* outUkn1, uint32be* outUkn2, uint32be* outUkn3)
+	{
+		cemuLog_logDebug(LogType::Force, "OSDriver_Register stubbed");
+		return 0;
+	}
+
+	uint32 OSDriver_Deregister(uint32 moduleHandle, sint32 driverId)
+	{
+		cemuLog_logDebug(LogType::Force, "OSDriver_Deregister stubbed");
+		return 0;
+	}
+
 	void miscInit()
 	{
+		s_currentTitleId = CafeSystem::GetForegroundTitleId();
 		s_sdkVersion = CafeSystem::GetForegroundTitleSDKVersion();
+		s_transitionToBackground = false;
+		s_transitionToForeground = false;
 
 		cafeExportRegister("coreinit", __os_snprintf, LogType::Placeholder);
 		cafeExportRegister("coreinit", OSReport, LogType::Placeholder);
@@ -480,6 +567,10 @@ namespace coreinit
 		cafeExportRegister("coreinit", COSWarn, LogType::Placeholder);
 		cafeExportRegister("coreinit", OSLogPrintf, LogType::Placeholder);
 		cafeExportRegister("coreinit", OSConsoleWrite, LogType::Placeholder);
+
+		cafeExportRegister("coreinit", OSGetPFID, LogType::Placeholder);
+		cafeExportRegister("coreinit", OSGetUPID, LogType::Placeholder);
+		cafeExportRegister("coreinit", OSGetTitleID, LogType::Placeholder);
 		cafeExportRegister("coreinit", __OSGetProcessSDKVersion, LogType::Placeholder);
 
 		g_homeButtonMenuEnabled = true; // enabled by default
@@ -489,6 +580,11 @@ namespace coreinit
 
 		cafeExportRegister("coreinit", OSLaunchTitleByPathl, LogType::Placeholder);
 		cafeExportRegister("coreinit", OSRestartGame, LogType::Placeholder);
+
+		cafeExportRegister("coreinit", OSReleaseForeground, LogType::Placeholder);
+
+		cafeExportRegister("coreinit", OSDriver_Register, LogType::Placeholder);
+		cafeExportRegister("coreinit", OSDriver_Deregister, LogType::Placeholder);
 	}
 
 };
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Misc.h b/src/Cafe/OS/libs/coreinit/coreinit_Misc.h
index 4a74d490..7abba92f 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Misc.h
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Misc.h
@@ -2,9 +2,29 @@
 
 namespace coreinit
 {
+	uint32 OSGetUPID();
+	uint32 OSGetPFID();
+	uint64 OSGetTitleID();
 	uint32 __OSGetProcessSDKVersion();
 	uint32 OSLaunchTitleByPathl(const char* path, uint32 pathLength, uint32 argc);
 	uint32 OSRestartGame(uint32 argc, MEMPTR<char>* argv);
 
+	void OSReleaseForeground();
+
+	void StartBackgroundForegroundTransition();
+
+	struct OSDriverInterface
+	{
+		MEMPTR<void> getDriverName;
+		MEMPTR<void> init;
+		MEMPTR<void> onAcquireForeground;
+		MEMPTR<void> onReleaseForeground;
+		MEMPTR<void> done;
+	};
+	static_assert(sizeof(OSDriverInterface) == 0x14);
+
+	uint32 OSDriver_Register(uint32 moduleHandle, sint32 priority, OSDriverInterface* driverCallbacks, sint32 driverId, uint32be* outUkn1, uint32be* outUkn2, uint32be* outUkn3);
+	uint32 OSDriver_Deregister(uint32 moduleHandle, sint32 driverId);
+
 	void miscInit();
 };
\ No newline at end of file
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Thread.cpp b/src/Cafe/OS/libs/coreinit/coreinit_Thread.cpp
index 809d7be4..654e57a8 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Thread.cpp
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Thread.cpp
@@ -294,9 +294,9 @@ namespace coreinit
 		__OSUnlockScheduler();
 	}
 
-	bool OSCreateThreadType(OSThread_t* thread, MPTR entryPoint, sint32 numParam, void* ptrParam, void* stackTop2, sint32 stackSize, sint32 priority, uint32 attr, OSThread_t::THREAD_TYPE threadType)
+	bool OSCreateThreadType(OSThread_t* thread, MPTR entryPoint, sint32 numParam, void* ptrParam, void* stackTop, sint32 stackSize, sint32 priority, uint32 attr, OSThread_t::THREAD_TYPE threadType)
 	{
-		OSCreateThreadInternal(thread, entryPoint, memory_getVirtualOffsetFromPointer(stackTop2) - stackSize, stackSize, attr, threadType);
+		OSCreateThreadInternal(thread, entryPoint, memory_getVirtualOffsetFromPointer(stackTop) - stackSize, stackSize, attr, threadType);
 		thread->context.gpr[3] = _swapEndianU32(numParam); // num arguments
 		thread->context.gpr[4] = _swapEndianU32(memory_getVirtualOffsetFromPointer(ptrParam)); // arguments pointer
 		__OSSetThreadBasePriority(thread, priority);
@@ -317,9 +317,15 @@ namespace coreinit
 		return true;
 	}
 
-	bool OSCreateThread(OSThread_t* thread, MPTR entryPoint, sint32 numParam, void* ptrParam, void* stackTop2, sint32 stackSize, sint32 priority, uint32 attr)
+	bool OSCreateThread(OSThread_t* thread, MPTR entryPoint, sint32 numParam, void* ptrParam, void* stackTop, sint32 stackSize, sint32 priority, uint32 attr)
 	{
-		return OSCreateThreadType(thread, entryPoint, numParam, ptrParam, stackTop2, stackSize, priority, attr, OSThread_t::THREAD_TYPE::TYPE_APP);
+		return OSCreateThreadType(thread, entryPoint, numParam, ptrParam, stackTop, stackSize, priority, attr, OSThread_t::THREAD_TYPE::TYPE_APP);
+	}
+
+	// alias to OSCreateThreadType, similar to OSCreateThread, but with an additional parameter for the thread type
+	bool __OSCreateThreadType(OSThread_t* thread, MPTR entryPoint, sint32 numParam, void* ptrParam, void* stackTop, sint32 stackSize, sint32 priority, uint32 attr, OSThread_t::THREAD_TYPE threadType)
+	{
+		return OSCreateThreadType(thread, entryPoint, numParam, ptrParam, stackTop, stackSize, priority, attr, threadType);
 	}
 
 	bool OSRunThread(OSThread_t* thread, MPTR funcAddress, sint32 numParam, void* ptrParam)
@@ -445,12 +451,12 @@ namespace coreinit
 		return currentThread->specificArray[index].GetPtr();
 	}
 
-	void OSSetThreadName(OSThread_t* thread, char* name)
+	void OSSetThreadName(OSThread_t* thread, const char* name)
 	{
 		thread->threadName = name;
 	}
 
-	char* OSGetThreadName(OSThread_t* thread)
+	const char* OSGetThreadName(OSThread_t* thread)
 	{
 		return thread->threadName.GetPtr();
 	}
@@ -1371,6 +1377,7 @@ namespace coreinit
 	{
 		cafeExportRegister("coreinit", OSCreateThreadType, LogType::CoreinitThread);
 		cafeExportRegister("coreinit", OSCreateThread, LogType::CoreinitThread);
+		cafeExportRegister("coreinit", __OSCreateThreadType, LogType::CoreinitThread);
 		cafeExportRegister("coreinit", OSExitThread, LogType::CoreinitThread);
 
 		cafeExportRegister("coreinit", OSGetCurrentThread, LogType::CoreinitThread);
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Thread.h b/src/Cafe/OS/libs/coreinit/coreinit_Thread.h
index e619d5b6..b401d96d 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Thread.h
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Thread.h
@@ -449,7 +449,7 @@ struct OSThread_t
 	/* +0x578 */ sint32								alarmRelatedUkn;
 	/* +0x57C */ std::array<MEMPTR<void>, 16>		specificArray;
 	/* +0x5BC */ betype<THREAD_TYPE>				type;
-	/* +0x5C0 */ MEMPTR<char>						threadName;
+	/* +0x5C0 */ MEMPTR<const char>					threadName;
 	/* +0x5C4 */ MPTR								waitAlarm;							// used only by OSWaitEventWithTimeout/OSSignalEvent ?
 
 	/* +0x5C8 */ uint32								userStackPointer;
@@ -505,6 +505,7 @@ namespace coreinit
 	void* OSGetDefaultThreadStack(sint32 coreIndex, uint32& size);
 
 	bool OSCreateThreadType(OSThread_t* thread, MPTR entryPoint, sint32 numParam, void* ptrParam, void* stackTop2, sint32 stackSize, sint32 priority, uint32 attr, OSThread_t::THREAD_TYPE threadType);
+	bool __OSCreateThreadType(OSThread_t* thread, MPTR entryPoint, sint32 numParam, void* ptrParam, void* stackTop, sint32 stackSize, sint32 priority, uint32 attr, OSThread_t::THREAD_TYPE threadType);
 	void OSCreateThreadInternal(OSThread_t* thread, uint32 entryPoint, MPTR stackLowerBaseAddr, uint32 stackSize, uint8 affinityMask, OSThread_t::THREAD_TYPE threadType);
 	bool OSRunThread(OSThread_t* thread, MPTR funcAddress, sint32 numParam, void* ptrParam);
 	void OSExitThread(sint32 exitValue);
@@ -519,8 +520,8 @@ namespace coreinit
 	bool OSSetThreadPriority(OSThread_t* thread, sint32 newPriority);
 	uint32 OSGetThreadAffinity(OSThread_t* thread);
 
-	void OSSetThreadName(OSThread_t* thread, char* name);
-	char* OSGetThreadName(OSThread_t* thread);
+	void OSSetThreadName(OSThread_t* thread, const char* name);
+	const char* OSGetThreadName(OSThread_t* thread);
 
 	sint32 __OSResumeThreadInternal(OSThread_t* thread, sint32 resumeCount);
 	sint32 OSResumeThread(OSThread_t* thread);
@@ -530,6 +531,7 @@ namespace coreinit
 	void OSSuspendThread(OSThread_t* thread);
 	void OSSleepThread(OSThreadQueue* threadQueue);
 	void OSWakeupThread(OSThreadQueue* threadQueue);
+	bool OSJoinThread(OSThread_t* thread, uint32be* exitValue);
 
 	void OSTestThreadCancelInternal();
 
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Time.cpp b/src/Cafe/OS/libs/coreinit/coreinit_Time.cpp
index 5a75b406..d6fc27b2 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Time.cpp
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Time.cpp
@@ -22,10 +22,9 @@ namespace coreinit
 		osLib_returnFromFunction(hCPU, (uint32)osTime);
 	}
 
-	void export_OSGetTime(PPCInterpreter_t* hCPU)
+	uint64 OSGetTime()
 	{
-		uint64 osTime = coreinit_getOSTime();
-		osLib_returnFromFunction64(hCPU, osTime);
+		return coreinit_getOSTime();
 	}
 
 	void export_OSGetSystemTime(PPCInterpreter_t* hCPU)
@@ -360,7 +359,7 @@ namespace coreinit
 
 	void InitializeTimeAndCalendar()
 	{
-		osLib_addFunction("coreinit", "OSGetTime", export_OSGetTime);
+		cafeExportRegister("coreinit", OSGetTime, LogType::Placeholder);
 		osLib_addFunction("coreinit", "OSGetSystemTime", export_OSGetSystemTime);
 		osLib_addFunction("coreinit", "OSGetTick", export_OSGetTick);
 		osLib_addFunction("coreinit", "OSGetSystemTick", export_OSGetSystemTick);
diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Time.h b/src/Cafe/OS/libs/coreinit/coreinit_Time.h
index f5dcf22e..018e8eb7 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Time.h
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Time.h
@@ -45,7 +45,8 @@ namespace coreinit
 	};
 
 	void OSTicksToCalendarTime(uint64 ticks, OSCalendarTime_t* calenderStruct);
-	
+	uint64 OSGetTime();
+
 	uint64 coreinit_getOSTime();
 	uint64 coreinit_getTimerTick();
 
diff --git a/src/Cafe/OS/libs/gx2/GX2_Misc.h b/src/Cafe/OS/libs/gx2/GX2_Misc.h
index e6ac8010..38a728c1 100644
--- a/src/Cafe/OS/libs/gx2/GX2_Misc.h
+++ b/src/Cafe/OS/libs/gx2/GX2_Misc.h
@@ -19,5 +19,7 @@ namespace GX2
 	void GX2SetTVBuffer(void* imageBuffePtr, uint32 imageBufferSize, E_TVRES tvResolutionMode, uint32 surfaceFormat, E_TVBUFFERMODE bufferMode);
 	void GX2SetTVGamma(float gamma);
 
+	void GX2Invalidate(uint32 invalidationFlags, MPTR invalidationAddr, uint32 invalidationSize);
+
 	void GX2MiscInit();
 };
\ No newline at end of file
diff --git a/src/Cafe/OS/libs/nn_olv/nn_olv.cpp b/src/Cafe/OS/libs/nn_olv/nn_olv.cpp
index 99c113c4..1916a18d 100644
--- a/src/Cafe/OS/libs/nn_olv/nn_olv.cpp
+++ b/src/Cafe/OS/libs/nn_olv/nn_olv.cpp
@@ -9,6 +9,7 @@
 
 #include "Cafe/OS/libs/proc_ui/proc_ui.h"
 #include "Cafe/OS/libs/coreinit/coreinit_Time.h"
+#include "Cafe/OS/libs/coreinit/coreinit_Misc.h"
 
 namespace nn
 {
@@ -37,7 +38,7 @@ namespace nn
 		void StubPostAppReleaseBackground(PPCInterpreter_t* hCPU)
 		{
 			coreinit::OSSleepTicks(ESPRESSO_TIMER_CLOCK * 2); // Sleep 2s
-			ProcUI_SendForegroundMessage();
+			coreinit::StartBackgroundForegroundTransition();
 		}
 
 		sint32 StubPostApp(void* pAnyPostParam)
diff --git a/src/Cafe/OS/libs/proc_ui/proc_ui.cpp b/src/Cafe/OS/libs/proc_ui/proc_ui.cpp
index 7de8691a..91d15af4 100644
--- a/src/Cafe/OS/libs/proc_ui/proc_ui.cpp
+++ b/src/Cafe/OS/libs/proc_ui/proc_ui.cpp
@@ -1,57 +1,905 @@
 #include "Cafe/OS/common/OSCommon.h"
+#include "Cafe/OS/libs/coreinit/coreinit_Alarm.h"
+#include "Cafe/OS/libs/coreinit/coreinit_Thread.h"
+#include "Cafe/OS/libs/coreinit/coreinit_MessageQueue.h"
+#include "Cafe/OS/libs/coreinit/coreinit_Misc.h"
+#include "Cafe/OS/libs/coreinit/coreinit_Memory.h"
+#include "Cafe/OS/libs/coreinit/coreinit_MEM_ExpHeap.h"
+#include "Cafe/OS/libs/coreinit/coreinit_Time.h"
+#include "Cafe/OS/libs/coreinit/coreinit_FG.h"
+#include "Cafe/OS/libs/coreinit/coreinit_DynLoad.h"
+#include "Cafe/OS/libs/gx2/GX2_Misc.h"
+#include "Cafe/OS/RPL/rpl.h"
+#include "Common/CafeString.h"
 #include "proc_ui.h"
 
-#define PROCUI_STATUS_FOREGROUND	0
-#define PROCUI_STATUS_BACKGROUND	1
-#define PROCUI_STATUS_RELEASING		2
-#define PROCUI_STATUS_EXIT			3
+// proc_ui is a utility wrapper to help apps with the transition between foreground and background
+// some games (like Xenoblades Chronicles X) bypass proc_ui.rpl and listen to OSGetSystemMessageQueue() directly
 
-uint32 ProcUIProcessMessages()
+using namespace coreinit;
+
+namespace proc_ui
 {
-	return PROCUI_STATUS_FOREGROUND;
-}
+	enum class ProcUICoreThreadCommand
+	{
+		AcquireForeground = 0x0,
+		ReleaseForeground = 0x1,
+		Exit = 0x2,
+		NetIoStart = 0x3,
+		NetIoStop = 0x4,
+		HomeButtonDenied = 0x5,
+		Initial = 0x6
+	};
+
+	struct ProcUIInternalCallbackEntry
+	{
+		coreinit::OSAlarm_t alarm;
+		uint64be tickDelay;
+		MEMPTR<void> funcPtr;
+		MEMPTR<void> userParam;
+		sint32be priority;
+		MEMPTR<ProcUIInternalCallbackEntry> next;
+	};
+	static_assert(sizeof(ProcUIInternalCallbackEntry) == 0x70);
+
+	struct ProcUICallbackList
+	{
+		MEMPTR<ProcUIInternalCallbackEntry> first;
+	};
+	static_assert(sizeof(ProcUICallbackList) == 0x4);
+
+	std::atomic_bool s_isInitialized;
+	bool s_isInForeground;
+	bool s_isInShutdown;
+	bool s_isForegroundProcess;
+	bool s_previouslyWasBlocking;
+	ProcUIStatus s_currentProcUIStatus;
+	MEMPTR<void> s_saveCallback; // no param and no return value, set by ProcUIInit()
+	MEMPTR<void> s_saveCallbackEx; // with custom param and return value, set by ProcUIInitEx()
+	MEMPTR<void> s_saveCallbackExUserParam;
+	MEMPTR<coreinit::OSMessageQueue> s_systemMessageQueuePtr;
+	SysAllocator<coreinit::OSEvent> s_eventStateMessageReceived;
+	SysAllocator<coreinit::OSEvent> s_eventWaitingBeforeReleaseForeground;
+	SysAllocator<coreinit::OSEvent> s_eventBackgroundThreadGotMessage;
+	// procUI core threads
+	uint32 s_coreThreadStackSize;
+	bool s_coreThreadsCreated;
+	std::atomic<ProcUICoreThreadCommand> s_commandForCoreThread;
+	SysAllocator<OSThread_t> s_coreThreadArray[Espresso::CORE_COUNT];
+	MEMPTR<void> s_coreThreadStackPerCore[Espresso::CORE_COUNT];
+	SysAllocator<CafeString<22>> s_coreThread0NameBuffer;
+	SysAllocator<CafeString<22>> s_coreThread1NameBuffer;
+	SysAllocator<CafeString<22>> s_coreThread2NameBuffer;
+	SysAllocator<coreinit::OSEvent> s_eventCoreThreadsNewCommandReady;
+	SysAllocator<coreinit::OSEvent> s_eventCoreThreadsCommandDone;
+	SysAllocator<coreinit::OSRendezvous> s_coreThreadRendezvousA;
+	SysAllocator<coreinit::OSRendezvous> s_coreThreadRendezvousB;
+	SysAllocator<coreinit::OSRendezvous> s_coreThreadRendezvousC;
+	// background thread
+	MEMPTR<void> s_backgroundThreadStack;
+	SysAllocator<OSThread_t> s_backgroundThread;
+	// user defined heap
+	MEMPTR<void> s_memoryPoolHeapPtr;
+	MEMPTR<void> s_memAllocPtr;
+	MEMPTR<void> s_memFreePtr;
+	// draw done release
+	bool s_drawDoneReleaseCalled;
+	// memory storage
+	MEMPTR<void> s_bucketStorageBasePtr;
+	MEMPTR<void> s_mem1StorageBasePtr;
+	// callbacks
+	ProcUICallbackList s_callbacksType0_AcquireForeground[Espresso::CORE_COUNT];
+	ProcUICallbackList s_callbacksType1_ReleaseForeground[Espresso::CORE_COUNT];
+	ProcUICallbackList s_callbacksType2_Exit[Espresso::CORE_COUNT];
+	ProcUICallbackList s_callbacksType3_NetIoStart[Espresso::CORE_COUNT];
+	ProcUICallbackList s_callbacksType4_NetIoStop[Espresso::CORE_COUNT];
+	ProcUICallbackList s_callbacksType5_HomeButtonDenied[Espresso::CORE_COUNT];
+	ProcUICallbackList* const s_CallbackTables[stdx::to_underlying(ProcUICallbackId::COUNT)] =
+		{s_callbacksType0_AcquireForeground, s_callbacksType1_ReleaseForeground, s_callbacksType2_Exit, s_callbacksType3_NetIoStart, s_callbacksType4_NetIoStop, s_callbacksType5_HomeButtonDenied};
+	ProcUICallbackList s_backgroundCallbackList;
+	// driver
+	bool s_driverIsActive;
+	uint32be s_driverArgUkn1;
+	uint32be s_driverArgUkn2;
+	bool s_driverInBackground;
+	SysAllocator<OSDriverInterface> s_ProcUIDriver;
+	SysAllocator<CafeString<16>> s_ProcUIDriverName;
 
 
-uint32 ProcUIInForeground(PPCInterpreter_t* hCPU)
-{
-	return 1; // true means application is in foreground
-}
+	void* _AllocMem(uint32 size)
+	{
+		MEMPTR<void> r{PPCCoreCallback(s_memAllocPtr, size)};
+		return r.GetPtr();
+	}
 
-struct ProcUICallback
-{
-	MPTR callback;
-	void* data;
-	sint32 priority;
+	void _FreeMem(void* ptr)
+	{
+		PPCCoreCallback(s_memFreePtr.GetMPTR(), ptr);
+	}
+
+	void ClearCallbacksWithoutMemFree()
+	{
+		for (sint32 coreIndex = 0; coreIndex < Espresso::CORE_COUNT; coreIndex++)
+		{
+			for (sint32 i = 0; i < stdx::to_underlying(ProcUICallbackId::COUNT); i++)
+				s_CallbackTables[i][coreIndex].first = nullptr;
+		}
+		s_backgroundCallbackList.first = nullptr;
+	}
+
+	void ShutdownThreads()
+	{
+		if ( !s_coreThreadsCreated)
+			return;
+		s_commandForCoreThread = ProcUICoreThreadCommand::Initial;
+		coreinit::OSMemoryBarrier();
+		OSSignalEvent(&s_eventCoreThreadsNewCommandReady);
+		for (sint32 coreIndex = 0; coreIndex < Espresso::CORE_COUNT; coreIndex++)
+		{
+			coreinit::OSJoinThread(&s_coreThreadArray[coreIndex], nullptr);
+			for (sint32 i = 0; i < stdx::to_underlying(ProcUICallbackId::COUNT); i++)
+			{
+				s_CallbackTables[i][coreIndex].first = nullptr; // memory is not cleanly released?
+			}
+		}
+		OSResetEvent(&s_eventCoreThreadsNewCommandReady);
+		for (sint32 coreIndex = 0; coreIndex < Espresso::CORE_COUNT; coreIndex++)
+		{
+			_FreeMem(s_coreThreadStackPerCore[coreIndex]);
+			s_coreThreadStackPerCore[coreIndex] = nullptr;
+		}
+		_FreeMem(s_backgroundThreadStack);
+		s_backgroundThreadStack = nullptr;
+		s_backgroundCallbackList.first = nullptr; // memory is not cleanly released?
+		s_coreThreadsCreated = false;
+	}
+
+	void DoCallbackChain(ProcUIInternalCallbackEntry* entry)
+	{
+		while (entry)
+		{
+			uint32 r = PPCCoreCallback(entry->funcPtr, entry->userParam);
+			if ( r )
+				cemuLog_log(LogType::APIErrors, "ProcUI: Callback returned error {}\n", r);
+			entry = entry->next;
+		}
+	}
+
+	void AlarmDoBackgroundCallback(PPCInterpreter_t* hCPU)
+	{
+		coreinit::OSAlarm_t* arg = MEMPTR<coreinit::OSAlarm_t>(hCPU->gpr[3]);
+		ProcUIInternalCallbackEntry* entry = (ProcUIInternalCallbackEntry*)arg;
+		uint32 r = PPCCoreCallback(entry->funcPtr, entry->userParam);
+		if ( r )
+			cemuLog_log(LogType::APIErrors, "ProcUI: Background callback returned error {}\n", r);
+		osLib_returnFromFunction(hCPU, 0); // return type is void
+	}
+
+	void StartBackgroundAlarms()
+	{
+		ProcUIInternalCallbackEntry* cb = s_backgroundCallbackList.first;
+		while(cb)
+		{
+			coreinit::OSCreateAlarm(&cb->alarm);
+			uint64 currentTime = coreinit::OSGetTime();
+			coreinit::OSSetPeriodicAlarm(&cb->alarm, currentTime, cb->tickDelay, RPLLoader_MakePPCCallable(AlarmDoBackgroundCallback));
+			cb = cb->next;
+		}
+	}
+
+	void CancelBackgroundAlarms()
+	{
+		ProcUIInternalCallbackEntry* entry = s_backgroundCallbackList.first;
+		while (entry)
+		{
+			OSCancelAlarm(&entry->alarm);
+			entry = entry->next;
+		}
+	}
+
+	void ProcUICoreThread(PPCInterpreter_t* hCPU)
+	{
+		uint32 coreIndex = hCPU->gpr[3];
+		cemu_assert_debug(coreIndex == OSGetCoreId());
+		while (true)
+		{
+			OSWaitEvent(&s_eventCoreThreadsNewCommandReady);
+			ProcUIInternalCallbackEntry* cbChain = nullptr;
+			cemuLog_logDebug(LogType::Force, "ProcUI: Core {} got command {}", coreIndex, (uint32)s_commandForCoreThread.load());
+			auto cmd = s_commandForCoreThread.load();
+			switch(cmd)
+			{
+			case ProcUICoreThreadCommand::Initial:
+			{
+				// signal to shut down thread
+				osLib_returnFromFunction(hCPU, 0);
+				return;
+			}
+			case ProcUICoreThreadCommand::AcquireForeground:
+				cbChain = s_callbacksType0_AcquireForeground[coreIndex].first;
+				break;
+			case ProcUICoreThreadCommand::ReleaseForeground:
+				cbChain = s_callbacksType1_ReleaseForeground[coreIndex].first;
+				break;
+			case ProcUICoreThreadCommand::Exit:
+				cbChain = s_callbacksType2_Exit[coreIndex].first;
+				break;
+			case ProcUICoreThreadCommand::NetIoStart:
+				cbChain = s_callbacksType3_NetIoStart[coreIndex].first;
+				break;
+			case ProcUICoreThreadCommand::NetIoStop:
+				cbChain = s_callbacksType4_NetIoStop[coreIndex].first;
+				break;
+			case ProcUICoreThreadCommand::HomeButtonDenied:
+				cbChain = s_callbacksType5_HomeButtonDenied[coreIndex].first;
+				break;
+			default:
+				cemu_assert_suspicious(); // invalid command
+			}
+			if(cmd == ProcUICoreThreadCommand::AcquireForeground)
+			{
+				if (coreIndex == 2)
+					CancelBackgroundAlarms();
+				cbChain = s_callbacksType0_AcquireForeground[coreIndex].first;
+			}
+			else if(cmd == ProcUICoreThreadCommand::ReleaseForeground)
+			{
+				if (coreIndex == 2)
+					StartBackgroundAlarms();
+				cbChain = s_callbacksType1_ReleaseForeground[coreIndex].first;
+			}
+			DoCallbackChain(cbChain);
+			OSWaitRendezvous(&s_coreThreadRendezvousA, 7);
+			if ( !coreIndex )
+			{
+				OSInitRendezvous(&s_coreThreadRendezvousC);
+				OSResetEvent(&s_eventCoreThreadsNewCommandReady);
+			}
+			OSWaitRendezvous(&s_coreThreadRendezvousB, 7);
+			if ( !coreIndex )
+			{
+				OSInitRendezvous(&s_coreThreadRendezvousA);
+				OSSignalEvent(&s_eventCoreThreadsCommandDone);
+			}
+			OSWaitRendezvous(&s_coreThreadRendezvousC, 7);
+			if ( !coreIndex )
+				OSInitRendezvous(&s_coreThreadRendezvousB);
+			if (cmd == ProcUICoreThreadCommand::ReleaseForeground)
+			{
+				OSWaitEvent(&s_eventWaitingBeforeReleaseForeground);
+				OSReleaseForeground();
+			}
+		}
+		osLib_returnFromFunction(hCPU, 0);
+	}
+
+	void RecreateProcUICoreThreads()
+	{
+		ShutdownThreads();
+		for (sint32 coreIndex = 0; coreIndex < Espresso::CORE_COUNT; coreIndex++)
+		{
+			s_coreThreadStackPerCore[coreIndex] = _AllocMem(s_coreThreadStackSize);
+		}
+		s_backgroundThreadStack = _AllocMem(s_coreThreadStackSize);
+		for (sint32 coreIndex = 0; coreIndex < Espresso::CORE_COUNT; coreIndex++)
+		{
+			__OSCreateThreadType(&s_coreThreadArray[coreIndex], RPLLoader_MakePPCCallable(ProcUICoreThread), coreIndex, nullptr,
+				(uint8*)s_coreThreadStackPerCore[coreIndex].GetPtr() + s_coreThreadStackSize, s_coreThreadStackSize, 16,
+				(1<<coreIndex), OSThread_t::THREAD_TYPE::TYPE_DRIVER);
+			OSResumeThread(&s_coreThreadArray[coreIndex]);
+		}
+		s_coreThread0NameBuffer->assign("{SYS ProcUI Core 0}");
+		s_coreThread1NameBuffer->assign("{SYS ProcUI Core 1}");
+		s_coreThread2NameBuffer->assign("{SYS ProcUI Core 2}");
+		OSSetThreadName(&s_coreThreadArray[0], s_coreThread0NameBuffer->c_str());
+		OSSetThreadName(&s_coreThreadArray[1], s_coreThread1NameBuffer->c_str());
+		OSSetThreadName(&s_coreThreadArray[2], s_coreThread2NameBuffer->c_str());
+		s_coreThreadsCreated = true;
+	}
+
+	void _SubmitCommandToCoreThreads(ProcUICoreThreadCommand cmd)
+	{
+		s_commandForCoreThread = cmd;
+		OSMemoryBarrier();
+		OSResetEvent(&s_eventCoreThreadsCommandDone);
+		OSSignalEvent(&s_eventCoreThreadsNewCommandReady);
+		OSWaitEvent(&s_eventCoreThreadsCommandDone);
+	}
+
+	void ProcUIInitInternal()
+	{
+		if( s_isInitialized.exchange(true) )
+			return;
+		if (!s_memoryPoolHeapPtr)
+		{
+			// user didn't specify a custom heap, use default heap instead
+			s_memAllocPtr = gCoreinitData->MEMAllocFromDefaultHeap.GetMPTR();
+			s_memFreePtr = gCoreinitData->MEMFreeToDefaultHeap.GetMPTR();
+		}
+		OSInitEvent(&s_eventStateMessageReceived, OSEvent::EVENT_STATE::STATE_NOT_SIGNALED, OSEvent::EVENT_MODE::MODE_MANUAL);
+		OSInitEvent(&s_eventCoreThreadsNewCommandReady, OSEvent::EVENT_STATE::STATE_NOT_SIGNALED, OSEvent::EVENT_MODE::MODE_MANUAL);
+		OSInitEvent(&s_eventWaitingBeforeReleaseForeground, OSEvent::EVENT_STATE::STATE_NOT_SIGNALED, OSEvent::EVENT_MODE::MODE_MANUAL);
+		OSInitEvent(&s_eventCoreThreadsCommandDone, OSEvent::EVENT_STATE::STATE_NOT_SIGNALED, OSEvent::EVENT_MODE::MODE_MANUAL);
+		OSInitRendezvous(&s_coreThreadRendezvousA);
+		OSInitRendezvous(&s_coreThreadRendezvousB);
+		OSInitRendezvous(&s_coreThreadRendezvousC);
+		OSInitEvent(&s_eventBackgroundThreadGotMessage, OSEvent::EVENT_STATE::STATE_NOT_SIGNALED, OSEvent::EVENT_MODE::MODE_MANUAL);
+		s_currentProcUIStatus = ProcUIStatus::Foreground;
+		s_drawDoneReleaseCalled = false;
+		s_isInForeground = true;
+		s_coreThreadStackSize = 0x2000;
+		s_systemMessageQueuePtr = coreinit::OSGetSystemMessageQueue();
+		uint32 upid = coreinit::OSGetUPID();
+		s_isForegroundProcess = upid == 2 || upid == 15; // either Wii U Menu or game title, both are RAMPID 7 (foreground process)
+		RecreateProcUICoreThreads();
+		ClearCallbacksWithoutMemFree();
+	}
+
+	void ProcUIInit(MEMPTR<void> callbackReadyToRelease)
+	{
+		s_saveCallback = callbackReadyToRelease;
+		s_saveCallbackEx = nullptr;
+		s_saveCallbackExUserParam = nullptr;
+		ProcUIInitInternal();
+	}
+
+	void ProcUIInitEx(MEMPTR<void> callbackReadyToReleaseEx, MEMPTR<void> userParam)
+	{
+		s_saveCallback = nullptr;
+		s_saveCallbackEx = callbackReadyToReleaseEx;
+		s_saveCallbackExUserParam = userParam;
+		ProcUIInitInternal();
+	}
+
+	void ProcUIShutdown()
+	{
+		if (!s_isInitialized.exchange(false))
+			return;
+		if ( !s_isInForeground )
+			CancelBackgroundAlarms();
+		for (sint32 i = 0; i < Espresso::CORE_COUNT; i++)
+			OSSetThreadPriority(&s_coreThreadArray[i], 0);
+		_SubmitCommandToCoreThreads(ProcUICoreThreadCommand::Exit);
+		ProcUIClearCallbacks();
+		ShutdownThreads();
+	}
+
+	bool ProcUIIsRunning()
+	{
+		return s_isInitialized;
+	}
+
+	bool ProcUIInForeground()
+	{
+		return s_isInForeground;
+	}
+
+	bool ProcUIInShutdown()
+	{
+		return s_isInShutdown;
+	}
+
+	void AddCallbackInternal(void* funcPtr, void* userParam, uint64 tickDelay, sint32 priority, ProcUICallbackList& callbackList)
+	{
+		if ( __OSGetProcessSDKVersion() < 21102 )
+		{
+			// in earlier COS versions it was possible/allowed to register a callback before initializing ProcUI
+			s_memAllocPtr = gCoreinitData->MEMAllocFromDefaultHeap.GetMPTR();
+			s_memFreePtr = gCoreinitData->MEMFreeToDefaultHeap.GetMPTR();
+		}
+		else if ( !s_isInitialized )
+		{
+			cemuLog_log(LogType::Force, "ProcUI: Trying to register callback before init");
+			cemu_assert_suspicious();
+		}
+		ProcUIInternalCallbackEntry* entry = (ProcUIInternalCallbackEntry*)_AllocMem(sizeof(ProcUIInternalCallbackEntry));
+		entry->funcPtr = funcPtr;
+		entry->userParam = userParam;
+		entry->tickDelay = tickDelay;
+		entry->priority = priority;
+		ProcUIInternalCallbackEntry* cur = callbackList.first;
+		cur = callbackList.first;
+		if (!cur || cur->priority > priority)
+		{
+			// insert as the first element
+			entry->next = cur;
+			callbackList.first = entry;
+		}
+		else
+		{
+			// find the correct position to insert
+			while (cur->next && cur->next->priority < priority)
+				cur = cur->next;
+			entry->next = cur->next;
+			cur->next = entry;
+		}
+	}
+
+	void ProcUIRegisterCallbackCore(ProcUICallbackId callbackType, void* funcPtr, void* userParam, sint32 priority, uint32 coreIndex)
+	{
+		if(callbackType >= ProcUICallbackId::COUNT)
+		{
+			cemuLog_log(LogType::Force, "ProcUIRegisterCallback: Invalid callback type {}", stdx::to_underlying(callbackType));
+			return;
+		}
+		if(callbackType != ProcUICallbackId::AcquireForeground)
+			priority = -priority;
+		AddCallbackInternal(funcPtr, userParam, priority, 0, s_CallbackTables[stdx::to_underlying(callbackType)][coreIndex]);
+	}
+
+	void ProcUIRegisterCallback(ProcUICallbackId callbackType, void* funcPtr, void* userParam, sint32 priority)
+	{
+		ProcUIRegisterCallbackCore(callbackType, funcPtr, userParam, priority, OSGetCoreId());
+	}
+
+	void ProcUIRegisterBackgroundCallback(void* funcPtr, void* userParam, uint64 tickDelay)
+	{
+		AddCallbackInternal(funcPtr, userParam, 0, tickDelay, s_backgroundCallbackList);
+	}
+
+	void FreeCallbackChain(ProcUICallbackList& callbackList)
+	{
+		ProcUIInternalCallbackEntry* entry = callbackList.first;
+		while (entry)
+		{
+			ProcUIInternalCallbackEntry* next = entry->next;
+			_FreeMem(entry);
+			entry = next;
+		}
+		callbackList.first = nullptr;
+	}
+
+	void ProcUIClearCallbacks()
+	{
+		for (sint32 coreIndex = 0; coreIndex < Espresso::CORE_COUNT; coreIndex++)
+		{
+			for (sint32 i = 0; i < stdx::to_underlying(ProcUICallbackId::COUNT); i++)
+			{
+				FreeCallbackChain(s_CallbackTables[i][coreIndex]);
+			}
+		}
+		if (!s_isInForeground)
+			CancelBackgroundAlarms();
+		FreeCallbackChain(s_backgroundCallbackList);
+	}
+
+	void ProcUISetSaveCallback(void* funcPtr, void* userParam)
+	{
+		s_saveCallback = nullptr;
+		s_saveCallbackEx = funcPtr;
+		s_saveCallbackExUserParam = userParam;
+	}
+
+	void ProcUISetCallbackStackSize(uint32 newStackSize)
+	{
+		s_coreThreadStackSize = newStackSize;
+		if( s_isInitialized )
+			RecreateProcUICoreThreads();
+	}
+
+	uint32 ProcUICalcMemorySize(uint32 numCallbacks)
+	{
+		// each callback entry is 0x70 bytes with 0x14 bytes of allocator overhead (for ExpHeap). But for some reason proc_ui on 5.5.5 seems to reserve 0x8C0 bytes per callback?
+		uint32 stackReserveSize = (Espresso::CORE_COUNT + 1) * s_coreThreadStackSize; // 3 core threads + 1 message receive thread
+		uint32 callbackReserveSize = 0x8C0 * numCallbacks;
+		return stackReserveSize + callbackReserveSize + 100;
+	}
+
+	void _MemAllocFromMemoryPool(PPCInterpreter_t* hCPU)
+	{
+		uint32 size = hCPU->gpr[3];
+		MEMPTR<void> r = MEMAllocFromExpHeapEx((MEMHeapHandle)s_memoryPoolHeapPtr.GetPtr(), size, 4);
+		osLib_returnFromFunction(hCPU, r.GetMPTR());
+	}
+
+	void _FreeToMemoryPoolExpHeap(PPCInterpreter_t* hCPU)
+	{
+		MEMPTR<void> mem{hCPU->gpr[3]};
+		MEMFreeToExpHeap((MEMHeapHandle)s_memoryPoolHeapPtr.GetPtr(), mem.GetPtr());
+		osLib_returnFromFunction(hCPU, 0);
+	}
+
+	sint32 ProcUISetMemoryPool(void* memBase, uint32 size)
+	{
+		s_memAllocPtr = RPLLoader_MakePPCCallable(_MemAllocFromMemoryPool);
+		s_memFreePtr = RPLLoader_MakePPCCallable(_FreeToMemoryPoolExpHeap);
+		s_memoryPoolHeapPtr = MEMCreateExpHeapEx(memBase, size, MEM_HEAP_OPTION_THREADSAFE);
+		return s_memoryPoolHeapPtr ? 0 : -1;
+	}
+
+	void ProcUISetBucketStorage(void* memBase, uint32 size)
+	{
+		MEMPTR<void> fgBase;
+		uint32be fgFreeSize;
+		OSGetForegroundBucketFreeArea((MPTR*)&fgBase, (MPTR*)&fgFreeSize);
+		if(fgFreeSize < size)
+			cemuLog_log(LogType::Force, "ProcUISetBucketStorage: Buffer size too small");
+		s_bucketStorageBasePtr = memBase;
+	}
+
+	void ProcUISetMEM1Storage(void* memBase, uint32 size)
+	{
+		MEMPTR<void> memBound;
+		uint32be memBoundSize;
+		OSGetMemBound(1, (MPTR*)memBound.GetBEPtr(), (uint32*)&memBoundSize);
+		if(memBoundSize < size)
+			cemuLog_log(LogType::Force, "ProcUISetMEM1Storage: Buffer size too small");
+		s_mem1StorageBasePtr = memBase;
+	}
+
+	void ProcUIDrawDoneRelease()
+	{
+		s_drawDoneReleaseCalled = true;
+	}
+
+	OSMessage g_lastMsg;
+
+	void ProcUI_BackgroundThread_ReceiveSingleMessage(PPCInterpreter_t* hCPU)
+	{
+		// the background thread receives messages in a loop until the title is either exited or foreground is acquired
+		while ( true )
+		{
+			OSReceiveMessage(s_systemMessageQueuePtr, &g_lastMsg, OS_MESSAGE_BLOCK); // blocking receive
+			SysMessageId lastMsgId = static_cast<SysMessageId>((uint32)g_lastMsg.data0);
+			if(lastMsgId == SysMessageId::MsgExit || lastMsgId == SysMessageId::MsgAcquireForeground)
+				break;
+			else if (lastMsgId == SysMessageId::HomeButtonDenied)
+			{
+				cemu_assert_suspicious(); // Home button denied should not be sent to background app
+			}
+			else if ( lastMsgId == SysMessageId::NetIoStartOrStop )
+			{
+				if (g_lastMsg.data1 )
+				{
+					// NetIo start message
+					for (sint32 i = 0; i < Espresso::CORE_COUNT; i++)
+						DoCallbackChain(s_callbacksType3_NetIoStart[i].first);
+				}
+				else
+				{
+					// NetIo stop message
+					for (sint32 i = 0; i < Espresso::CORE_COUNT; i++)
+						DoCallbackChain(s_callbacksType4_NetIoStop[i].first);
+				}
+			}
+			else
+			{
+				cemuLog_log(LogType::Force, "ProcUI: BackgroundThread received invalid message 0x{:08x}", lastMsgId);
+			}
+		}
+		OSSignalEvent(&s_eventBackgroundThreadGotMessage);
+		osLib_returnFromFunction(hCPU, 0);
+	}
+
+	// handle received message
+	// if the message is Exit this function returns false, in all other cases it returns true
+	bool ProcessSysMessage(OSMessage* msg)
+	{
+		SysMessageId lastMsgId = static_cast<SysMessageId>((uint32)msg->data0);
+		if ( lastMsgId == SysMessageId::MsgAcquireForeground )
+		{
+			cemuLog_logDebug(LogType::Force, "ProcUI: Received Acquire Foreground message");
+			s_isInShutdown = false;
+			_SubmitCommandToCoreThreads(ProcUICoreThreadCommand::AcquireForeground);
+			s_currentProcUIStatus = ProcUIStatus::Foreground;
+			s_isInForeground = true;
+			OSMemoryBarrier();
+			OSSignalEvent(&s_eventStateMessageReceived);
+			return true;
+		}
+		else if (lastMsgId == SysMessageId::MsgExit)
+		{
+			cemuLog_logDebug(LogType::Force, "ProcUI: Received Exit message");
+			s_isInShutdown = true;
+			_SubmitCommandToCoreThreads(ProcUICoreThreadCommand::Exit);
+			for (sint32 i = 0; i < Espresso::CORE_COUNT; i++)
+				FreeCallbackChain(s_callbacksType2_Exit[i]);
+			s_currentProcUIStatus = ProcUIStatus::Exit;
+			OSMemoryBarrier();
+			OSSignalEvent(&s_eventStateMessageReceived);
+			return 0;
+		}
+		if (lastMsgId == SysMessageId::MsgReleaseForeground)
+		{
+			if (msg->data1 != 0)
+			{
+				cemuLog_logDebug(LogType::Force, "ProcUI: Received Release Foreground message as part of shutdown initiation");
+				s_isInShutdown = true;
+			}
+			else
+			{
+				cemuLog_logDebug(LogType::Force, "ProcUI: Received Release Foreground message");
+			}
+			s_currentProcUIStatus = ProcUIStatus::Releasing;
+			OSResetEvent(&s_eventStateMessageReceived);
+			// dont submit a command for the core threads yet, we need to wait for ProcUIDrawDoneRelease()
+		}
+		else if (lastMsgId == SysMessageId::HomeButtonDenied)
+		{
+			cemuLog_logDebug(LogType::Force, "ProcUI: Received Home Button Denied message");
+			_SubmitCommandToCoreThreads(ProcUICoreThreadCommand::HomeButtonDenied);
+		}
+		else if ( lastMsgId == SysMessageId::NetIoStartOrStop )
+		{
+			if (msg->data1 != 0)
+			{
+				cemuLog_logDebug(LogType::Force, "ProcUI: Received Net IO Start message");
+				_SubmitCommandToCoreThreads(ProcUICoreThreadCommand::NetIoStart);
+			}
+			else
+			{
+				cemuLog_logDebug(LogType::Force, "ProcUI: Received Net IO Stop message");
+				_SubmitCommandToCoreThreads(ProcUICoreThreadCommand::NetIoStop);
+			}
+		}
+		else
+		{
+			cemuLog_log(LogType::Force, "ProcUI: Received unknown message 0x{:08x}", (uint32)lastMsgId);
+		}
+		return true;
+	}
+
+	ProcUIStatus ProcUIProcessMessages(bool isBlockingInBackground)
+	{
+		OSMessage msg;
+		if (!s_isInitialized)
+		{
+			cemuLog_logOnce(LogType::Force, "ProcUIProcessMessages: ProcUI not initialized");
+			cemu_assert_suspicious();
+			return ProcUIStatus::Foreground;
+		}
+		if ( !isBlockingInBackground && OSGetCoreId() != 2 )
+		{
+			cemuLog_logOnce(LogType::Force, "ProcUIProcessMessages: Non-blocking call must run on core 2");
+		}
+		if (s_previouslyWasBlocking && isBlockingInBackground )
+		{
+			cemuLog_logOnce(LogType::Force, "ProcUIProcessMessages: Cannot switch to blocking mode when in background");
+		}
+		s_currentProcUIStatus = s_isInForeground ? ProcUIStatus::Foreground : ProcUIStatus::Background;
+		if (s_drawDoneReleaseCalled)
+		{
+			s_isInForeground = false;
+			s_currentProcUIStatus = ProcUIStatus::Background;
+			_SubmitCommandToCoreThreads(ProcUICoreThreadCommand::ReleaseForeground);
+			OSResetEvent(&s_eventWaitingBeforeReleaseForeground);
+			if(s_saveCallback)
+				PPCCoreCallback(s_saveCallback);
+			if(s_saveCallbackEx)
+				PPCCoreCallback(s_saveCallbackEx, s_saveCallbackExUserParam);
+			if (s_isForegroundProcess && isBlockingInBackground)
+			{
+				// start background thread
+				__OSCreateThreadType(&s_backgroundThread, RPLLoader_MakePPCCallable(ProcUI_BackgroundThread_ReceiveSingleMessage),
+					0, nullptr, (uint8*)s_backgroundThreadStack.GetPtr() + s_coreThreadStackSize, s_coreThreadStackSize,
+					16, (1<<2), OSThread_t::THREAD_TYPE::TYPE_DRIVER);
+				OSResumeThread(&s_backgroundThread);
+				s_previouslyWasBlocking = true;
+			}
+			cemuLog_logDebug(LogType::Force, "ProcUI: Releasing foreground");
+			OSSignalEvent(&s_eventWaitingBeforeReleaseForeground);
+			s_drawDoneReleaseCalled = false;
+		}
+		if (s_isInForeground || !isBlockingInBackground)
+		{
+			// non-blocking mode
+			if ( OSReceiveMessage(s_systemMessageQueuePtr, &msg, 0) )
+			{
+				s_previouslyWasBlocking = false;
+				if ( !ProcessSysMessage(&msg) )
+					return s_currentProcUIStatus;
+				// continue below, if we are now in background then ProcUIProcessMessages enters blocking mode
+			}
+		}
+		// blocking mode (if in background and param is true)
+		while (!s_isInForeground && isBlockingInBackground)
+		{
+			if ( !s_isForegroundProcess)
+			{
+				OSReceiveMessage(s_systemMessageQueuePtr, &msg, OS_MESSAGE_BLOCK);
+				s_previouslyWasBlocking = false;
+				if ( !ProcessSysMessage(&msg) )
+					return s_currentProcUIStatus;
+			}
+			// this code should only run if the background thread was started? Maybe rearrange the code to make this more clear
+			OSWaitEvent(&s_eventBackgroundThreadGotMessage);
+			OSResetEvent(&s_eventBackgroundThreadGotMessage);
+			OSJoinThread(&s_backgroundThread, nullptr);
+			msg = g_lastMsg; // g_lastMsg is set by the background thread
+			s_previouslyWasBlocking = false;
+			if ( !ProcessSysMessage(&msg) )
+				return s_currentProcUIStatus;
+		}
+		return s_currentProcUIStatus;
+	}
+
+	ProcUIStatus ProcUISubProcessMessages(bool isBlockingInBackground)
+	{
+		if (isBlockingInBackground)
+		{
+			while (s_currentProcUIStatus == ProcUIStatus::Background)
+				OSWaitEvent(&s_eventStateMessageReceived);
+		}
+		return s_currentProcUIStatus;
+	}
+
+	const char* ProcUIDriver_GetName()
+	{
+		s_ProcUIDriverName->assign("ProcUI");
+		return s_ProcUIDriverName->c_str();
+	}
+
+	void ProcUIDriver_Init(/* parameters unknown */)
+	{
+		s_driverIsActive = true;
+		OSMemoryBarrier();
+	}
+
+	void ProcUIDriver_OnDone(/* parameters unknown */)
+	{
+		if (s_driverIsActive)
+		{
+			ProcUIShutdown();
+			s_driverIsActive = false;
+			OSMemoryBarrier();
+		}
+	}
+
+	void StoreMEM1AndFGBucket()
+	{
+		if (s_mem1StorageBasePtr)
+		{
+			MEMPTR<void> memBound;
+			uint32be memBoundSize;
+			OSGetMemBound(1, (MPTR*)memBound.GetBEPtr(), (uint32*)&memBoundSize);
+			OSBlockMove(s_mem1StorageBasePtr.GetPtr(), memBound.GetPtr(), memBoundSize, true);
+		}
+		if (s_bucketStorageBasePtr)
+		{
+			MEMPTR<void> memBound;
+			uint32be memBoundSize;
+			OSGetForegroundBucketFreeArea((MPTR*)memBound.GetBEPtr(), (MPTR*)&memBoundSize);
+			OSBlockMove(s_bucketStorageBasePtr.GetPtr(), memBound.GetPtr(), memBoundSize, true);
+		}
+	}
+
+	void RestoreMEM1AndFGBucket()
+	{
+		if (s_mem1StorageBasePtr)
+		{
+			MEMPTR<void> memBound;
+			uint32be memBoundSize;
+			OSGetMemBound(1, (MPTR*)memBound.GetBEPtr(), (uint32*)&memBoundSize);
+			OSBlockMove(memBound.GetPtr(), s_mem1StorageBasePtr, memBoundSize, true);
+			GX2::GX2Invalidate(0x40, s_mem1StorageBasePtr.GetMPTR(), memBoundSize);
+		}
+		if (s_bucketStorageBasePtr)
+		{
+			MEMPTR<void> memBound;
+			uint32be memBoundSize;
+			OSGetForegroundBucketFreeArea((MPTR*)memBound.GetBEPtr(), (MPTR*)&memBoundSize);
+			OSBlockMove(memBound.GetPtr(), s_bucketStorageBasePtr, memBoundSize, true);
+			GX2::GX2Invalidate(0x40, memBound.GetMPTR(), memBoundSize);
+		}
+	}
+
+	void ProcUIDriver_OnAcquiredForeground(/* parameters unknown */)
+	{
+		if (s_driverInBackground)
+		{
+			ProcUIDriver_Init();
+			s_driverInBackground = false;
+		}
+		else
+		{
+			RestoreMEM1AndFGBucket();
+			s_driverIsActive = true;
+			OSMemoryBarrier();
+		}
+	}
+
+	void ProcUIDriver_OnReleaseForeground(/* parameters unknown */)
+	{
+		StoreMEM1AndFGBucket();
+		s_driverIsActive = false;
+		OSMemoryBarrier();
+	}
+
+	sint32 rpl_entry(uint32 moduleHandle, RplEntryReason reason)
+	{
+		if ( reason == RplEntryReason::Loaded )
+		{
+			s_ProcUIDriver->getDriverName = RPLLoader_MakePPCCallable([](PPCInterpreter_t* hCPU) {MEMPTR<const char> namePtr(ProcUIDriver_GetName()); osLib_returnFromFunction(hCPU, namePtr.GetMPTR()); });
+			s_ProcUIDriver->init = RPLLoader_MakePPCCallable([](PPCInterpreter_t* hCPU) {ProcUIDriver_Init(); osLib_returnFromFunction(hCPU, 0); });
+			s_ProcUIDriver->onAcquireForeground = RPLLoader_MakePPCCallable([](PPCInterpreter_t* hCPU) {ProcUIDriver_OnAcquiredForeground(); osLib_returnFromFunction(hCPU, 0); });
+			s_ProcUIDriver->onReleaseForeground = RPLLoader_MakePPCCallable([](PPCInterpreter_t* hCPU) {ProcUIDriver_OnReleaseForeground(); osLib_returnFromFunction(hCPU, 0); });
+			s_ProcUIDriver->done = RPLLoader_MakePPCCallable([](PPCInterpreter_t* hCPU) {ProcUIDriver_OnDone(); osLib_returnFromFunction(hCPU, 0); });
+
+			s_driverIsActive = false;
+			s_driverArgUkn1 = 0;
+			s_driverArgUkn2 = 0;
+			s_driverInBackground = false;
+			uint32be ukn3;
+			OSDriver_Register(moduleHandle, 200, &s_ProcUIDriver, 0, &s_driverArgUkn1, &s_driverArgUkn2, &ukn3);
+			if ( ukn3 )
+			{
+				if ( OSGetForegroundBucket(nullptr, nullptr) )
+				{
+					ProcUIDriver_Init();
+					OSMemoryBarrier();
+					return 0;
+				}
+				s_driverInBackground = true;
+			}
+			OSMemoryBarrier();
+		}
+		else if ( reason == RplEntryReason::Unloaded )
+		{
+			ProcUIDriver_OnDone();
+			OSDriver_Deregister(moduleHandle, 0);
+		}
+		return 0;
+	}
+
+	void reset()
+	{
+		// set variables to their initial state as if the RPL was just loaded
+		s_isInitialized = false;
+		s_isInShutdown = false;
+		s_isInForeground = false; // ProcUIInForeground returns false until ProcUIInit(Ex) is called
+		s_isForegroundProcess = true;
+		s_saveCallback = nullptr;
+		s_saveCallbackEx = nullptr;
+		s_systemMessageQueuePtr = nullptr;
+		ClearCallbacksWithoutMemFree();
+		s_currentProcUIStatus = ProcUIStatus::Foreground;
+		s_bucketStorageBasePtr = nullptr;
+		s_mem1StorageBasePtr = nullptr;
+		s_drawDoneReleaseCalled = false;
+		s_previouslyWasBlocking = false;
+		// core threads
+		s_coreThreadStackSize = 0;
+		s_coreThreadsCreated = false;
+		s_commandForCoreThread = ProcUICoreThreadCommand::Initial;
+		// background thread
+		s_backgroundThreadStack = nullptr;
+		// user defined heap
+		s_memoryPoolHeapPtr = nullptr;
+		s_memAllocPtr = nullptr;
+		s_memFreePtr = nullptr;
+		// driver
+		s_driverIsActive = false;
+		s_driverInBackground = false;
+	}
+
+	void load()
+	{
+		reset();
+
+		cafeExportRegister("proc_ui", ProcUIInit, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIInitEx, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIShutdown, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIIsRunning, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIInForeground, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIInShutdown, LogType::ProcUi);
+
+		cafeExportRegister("proc_ui", ProcUIRegisterCallbackCore, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIRegisterCallback, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIRegisterBackgroundCallback, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIClearCallbacks, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUISetSaveCallback, LogType::ProcUi);
+
+		cafeExportRegister("proc_ui", ProcUISetCallbackStackSize, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUICalcMemorySize, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUISetMemoryPool, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUISetBucketStorage, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUISetMEM1Storage, LogType::ProcUi);
+
+		cafeExportRegister("proc_ui", ProcUIDrawDoneRelease, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUIProcessMessages, LogType::ProcUi);
+		cafeExportRegister("proc_ui", ProcUISubProcessMessages, LogType::ProcUi);
+
+		// manually call rpl_entry for now
+		rpl_entry(-1, RplEntryReason::Loaded);
+	}
 };
-std::unordered_map<uint32, ProcUICallback> g_Callbacks;
-
-uint32 ProcUIRegisterCallback(uint32 message, MPTR callback, void* data, sint32 priority)
-{
-	g_Callbacks.insert_or_assign(message, ProcUICallback{ .callback = callback, .data = data, .priority = priority });
-	return 0;
-}
-
-void ProcUI_SendBackgroundMessage()
-{
-	if (g_Callbacks.contains(PROCUI_STATUS_BACKGROUND))
-	{
-		ProcUICallback& callback = g_Callbacks[PROCUI_STATUS_BACKGROUND];
-		PPCCoreCallback(callback.callback, callback.data);
-	}
-}
-
-void ProcUI_SendForegroundMessage()
-{
-	if (g_Callbacks.contains(PROCUI_STATUS_FOREGROUND))
-	{
-		ProcUICallback& callback = g_Callbacks[PROCUI_STATUS_FOREGROUND];
-		PPCCoreCallback(callback.callback, callback.data);
-	}
-}
-
-void procui_load()
-{
-	cafeExportRegister("proc_ui", ProcUIRegisterCallback, LogType::ProcUi);
-	cafeExportRegister("proc_ui", ProcUIProcessMessages, LogType::ProcUi);
-	cafeExportRegister("proc_ui", ProcUIInForeground, LogType::ProcUi);
-}
\ No newline at end of file
diff --git a/src/Cafe/OS/libs/proc_ui/proc_ui.h b/src/Cafe/OS/libs/proc_ui/proc_ui.h
index 1cd04fb1..8de7bb4d 100644
--- a/src/Cafe/OS/libs/proc_ui/proc_ui.h
+++ b/src/Cafe/OS/libs/proc_ui/proc_ui.h
@@ -1,5 +1,44 @@
 
-void procui_load();
+namespace proc_ui
+{
+	enum class ProcUIStatus
+	{
+		Foreground = 0,
+		Background = 1,
+		Releasing = 2,
+		Exit = 3
+	};
 
-void ProcUI_SendForegroundMessage();
-void ProcUI_SendBackgroundMessage();
\ No newline at end of file
+	enum class ProcUICallbackId
+	{
+		AcquireForeground = 0,
+		ReleaseForeground = 1,
+		Exit = 2,
+		NetIoStart = 3,
+		NetIoStop = 4,
+		HomeButtonDenied = 5,
+		COUNT = 6
+	};
+
+	void ProcUIInit(MEMPTR<void> callbackReadyToRelease);
+	void ProcUIInitEx(MEMPTR<void> callbackReadyToReleaseEx, MEMPTR<void> userParam);
+	void ProcUIShutdown();
+	bool ProcUIIsRunning();
+	bool ProcUIInForeground();
+	bool ProcUIInShutdown();
+	void ProcUIRegisterCallback(ProcUICallbackId callbackType, void* funcPtr, void* userParam, sint32 priority);
+	void ProcUIRegisterCallbackCore(ProcUICallbackId callbackType, void* funcPtr, void* userParam, sint32 priority, uint32 coreIndex);
+	void ProcUIRegisterBackgroundCallback(void* funcPtr, void* userParam, uint64 tickDelay);
+	void ProcUIClearCallbacks();
+	void ProcUISetSaveCallback(void* funcPtr, void* userParam);
+	void ProcUISetCallbackStackSize(uint32 newStackSize);
+	uint32 ProcUICalcMemorySize(uint32 numCallbacks);
+	sint32 ProcUISetMemoryPool(void* memBase, uint32 size);
+	void ProcUISetBucketStorage(void* memBase, uint32 size);
+	void ProcUISetMEM1Storage(void* memBase, uint32 size);
+	void ProcUIDrawDoneRelease();
+	ProcUIStatus ProcUIProcessMessages(bool isBlockingInBackground);
+	ProcUIStatus ProcUISubProcessMessages(bool isBlockingInBackground);
+
+	void load();
+}
\ No newline at end of file
diff --git a/src/Cafe/OS/libs/sysapp/sysapp.cpp b/src/Cafe/OS/libs/sysapp/sysapp.cpp
index 413d535a..ecaa940a 100644
--- a/src/Cafe/OS/libs/sysapp/sysapp.cpp
+++ b/src/Cafe/OS/libs/sysapp/sysapp.cpp
@@ -639,11 +639,34 @@ namespace sysapp
 		return coreinit::OSRestartGame(argc, argv);
 	}
 
+	struct EManualArgs
+	{
+		sysStandardArguments_t stdArgs;
+		uint64be titleId;
+	};
+	static_assert(sizeof(EManualArgs) == 0x10);
+
+	void _SYSSwitchToEManual(EManualArgs* args)
+	{
+		// the struct has the titleId at offset 8 and standard args at 0 (total size is most likely 0x10)
+		cemuLog_log(LogType::Force, "SYSSwitchToEManual called. Opening the manual is not supported");
+		coreinit::StartBackgroundForegroundTransition();
+	}
+
+	void SYSSwitchToEManual()
+	{
+		EManualArgs args{};
+		args.titleId = coreinit::OSGetTitleID();
+		_SYSSwitchToEManual(&args);
+	}
+
 	void load()
 	{
 		cafeExportRegisterFunc(SYSClearSysArgs, "sysapp", "SYSClearSysArgs", LogType::Placeholder);
 		cafeExportRegisterFunc(_SYSLaunchTitleByPathFromLauncher, "sysapp", "_SYSLaunchTitleByPathFromLauncher", LogType::Placeholder);
 		cafeExportRegisterFunc(SYSRelaunchTitle, "sysapp", "SYSRelaunchTitle", LogType::Placeholder);
+		cafeExportRegister("sysapp", _SYSSwitchToEManual, LogType::Placeholder);
+		cafeExportRegister("sysapp", SYSSwitchToEManual, LogType::Placeholder);
 	}
 }
 
diff --git a/src/Common/CafeString.h b/src/Common/CafeString.h
index 45a515b1..d902d721 100644
--- a/src/Common/CafeString.h
+++ b/src/Common/CafeString.h
@@ -20,6 +20,11 @@ class CafeString // fixed buffer size, null-terminated, PPC char
 		return true;
 	}
 
+	const char* c_str()
+	{
+		return (const char*)data;
+	}
+
 	uint8be data[N];
 };