Oops, CreateMutex was missing a parameter.

Core/HLE/FunctionWrappers.h

@@ -133,6 +133,11 @@ template<u32 func(const char *, u32, u32)> void WrapU_CUU() {
   RETURN((u32)retval);
 }
 
+template<u32 func(const char *, u32, u32, u32)> void WrapU_CUUU() {
+  int retval = func(Memory::GetCharPointer(PARAM(0)), PARAM(1), PARAM(2), PARAM(3));
+  RETURN((u32)retval);
+}
+
 template<u32 func(u32, u32, u32)> void WrapU_UUU() {
   u32 retval = func(PARAM(0), PARAM(1), PARAM(2));
   RETURN(retval);

Core/HLE/sceKernel.cpp

@@ -343,7 +343,7 @@ const HLEFunction ThreadManForUser[] =
 	{0xB011B11F,&WrapU_UUU<sceKernelLockMutex>,"sceKernelLockMutex"},
 	{0x5bf4dd27,&WrapU_UUU<sceKernelLockMutexCB>,"sceKernelLockMutexCB"},
 	{0x6b30100f,&WrapV_UU<sceKernelUnlockMutex>,"sceKernelUnlockMutex"},
-	{0xb7d098c6,&WrapU_CUU<sceKernelCreateMutex>,"sceKernelCreateMutex"},
+	{0xb7d098c6,&WrapU_CUUU<sceKernelCreateMutex>,"sceKernelCreateMutex"},
 	{0x0DDCD2C9, 0, "sceKernelTryLockMutex"},
 	// NOTE: LockLwMutex and UnlockLwMutex are in Kernel_Library, see sceKernelInterrupt.cpp.
 

Core/HLE/sceKernelMutex.cpp

@@ -28,7 +28,7 @@
 #define PSP_MUTEX_ATTR_ALLOW_RECURSIVE 0x200
 
 // Not sure about the names of these
-#define PSP_MUTEX_ERROR_NOT_LOCKED 0x800201C7
+#define PSP_MUTEX_ERROR_NOT_LOCKED 0x800201C5
 #define PSP_MUTEX_ERROR_NO_SUCH_MUTEX 0x800201C3
 #define PSP_MUTEX_ERROR_UNLOCK_UNDERFLOW 0x800201C7
 
@@ -63,7 +63,7 @@ struct LWMutex : public KernelObject
 	std::vector<SceUID> waitingThreads;
 };
 
-u32 sceKernelCreateMutex(const char *name, u32 attr, u32 options)
+u32 sceKernelCreateMutex(const char *name, u32 attr, u32 initial_count, u32 options)
 {
 	DEBUG_LOG(HLE,"sceKernelCreateMutex(%s, %08x, %08x)", name, attr, options);
 
@@ -72,7 +72,8 @@ u32 sceKernelCreateMutex(const char *name, u32 attr, u32 options)
 
 	mutex->nm.size = sizeof(mutex);
 	mutex->nm.attr = attr;
-	mutex->nm.lockLevel = 0;
+	mutex->nm.lockLevel = initial_count;
+	// TODO: Does initial_count > 0 mean lock automatically by the current thread?  Would make sense.
 	mutex->nm.lockThread = -1;
 
 	strncpy(mutex->nm.name, name, 32);

Core/HLE/sceKernelMutex.h

@@ -18,7 +18,7 @@
 #pragma once
 
 // TODO
-u32 sceKernelCreateMutex(const char *name, u32 attr, u32 options);
+u32 sceKernelCreateMutex(const char *name, u32 attr, u32 initial_count, u32 options);
 u32 sceKernelDeleteMutex(u32 id);
 u32 sceKernelLockMutex(u32 id, u32 count, u32 timeoutPtr);
 u32 sceKernelLockMutexCB(u32 id, u32 count, u32 timeoutPtr);