5 files changed, 72 insertions, 18 deletions

diff --git a/src/core/hle/service/apt/apt.cpp b/src/core/hle/service/apt/apt.cpp
index 7b6ab4ce0..35402341b 100644
--- a/src/core/hle/service/apt/apt.cpp
+++ b/src/core/hle/service/apt/apt.cpp
@@ -101,18 +101,19 @@ void NotifyToWait(Service::Interface* self) {
 
 void GetLockHandle(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
-    u32 flags = cmd_buff[1]; // TODO(bunnei): Figure out the purpose of the flag field
+    // Bits [0:2] are the applet type (System, Library, etc)
+    // Bit 5 tells the application that there's a pending APT parameter,
+    // this will cause the app to wait until parameter_event is signaled.
+    u32 applet_attributes = cmd_buff[1];
 
     cmd_buff[1] = RESULT_SUCCESS.raw; // No error
 
-    // Not sure what these parameters are used for, but retail apps check that they are 0 after
-    // GetLockHandle has been called.
-    cmd_buff[2] = 0; // Applet Attributes, this value is passed to Enable.
-    cmd_buff[3] = 0;
-    cmd_buff[4] = 0;
-
+    cmd_buff[2] = applet_attributes; // Applet Attributes, this value is passed to Enable.
+    cmd_buff[3] = 0; // Least significant bit = power button state
+    cmd_buff[4] = IPC::CopyHandleDesc();
     cmd_buff[5] = Kernel::g_handle_table.Create(lock).MoveFrom();
-    LOG_TRACE(Service_APT, "called handle=0x%08X", cmd_buff[5]);
+
+    LOG_WARNING(Service_APT, "(STUBBED) called handle=0x%08X applet_attributes=0x%08X", cmd_buff[5], applet_attributes);
 }
 
 void Enable(Service::Interface* self) {
@@ -139,13 +140,16 @@ void IsRegistered(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
     u32 app_id = cmd_buff[1];
     cmd_buff[1] = RESULT_SUCCESS.raw; // No error
-    /// TODO(Subv): It is currently unknown what this value (0x400) means,
-    /// but i believe it is used as a global "LibraryApplet" id, to verify if there's
-    /// any LibApplet currently running. This is not verified.
-    if (app_id != 0x400)
+
+    // TODO(Subv): An application is considered "registered" if it has already called APT::Enable
+    // handle this properly once we implement multiprocess support.
+    cmd_buff[2] = 0; // Set to not registered by default
+
+    if (app_id == static_cast<u32>(AppletId::AnyLibraryApplet)) {
+        cmd_buff[2] = HLE::Applets::IsLibraryAppletRunning() ? 1 : 0;
+    } else if (auto applet = HLE::Applets::Applet::Get(static_cast<AppletId>(app_id))) {
         cmd_buff[2] = 1; // Set to registered
-    else
-        cmd_buff[2] = 0; // Set to not registered
+    }
     LOG_WARNING(Service_APT, "(STUBBED) called app_id=0x%08X", app_id);
 }
 
@@ -330,7 +334,26 @@ void GetAppCpuTimeLimit(Service::Interface* self) {
 void PrepareToStartLibraryApplet(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
     AppletId applet_id = static_cast<AppletId>(cmd_buff[1]);
-    cmd_buff[1] = HLE::Applets::Applet::Create(applet_id).raw;
+    auto applet = HLE::Applets::Applet::Get(applet_id);
+    if (applet) {
+        LOG_WARNING(Service_APT, "applet has already been started id=%08X", applet_id);
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        cmd_buff[1] = HLE::Applets::Applet::Create(applet_id).raw;
+    }
+    LOG_DEBUG(Service_APT, "called applet_id=%08X", applet_id);
+}
+
+void PreloadLibraryApplet(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+    AppletId applet_id = static_cast<AppletId>(cmd_buff[1]);
+    auto applet = HLE::Applets::Applet::Get(applet_id);
+    if (applet) {
+        LOG_WARNING(Service_APT, "applet has already been started id=%08X", applet_id);
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        cmd_buff[1] = HLE::Applets::Applet::Create(applet_id).raw;
+    }
     LOG_DEBUG(Service_APT, "called applet_id=%08X", applet_id);
 }
 
diff --git a/src/core/hle/service/apt/apt.h b/src/core/hle/service/apt/apt.h
index 72972d05b..4a72b6b5c 100644
--- a/src/core/hle/service/apt/apt.h
+++ b/src/core/hle/service/apt/apt.h
@@ -62,6 +62,7 @@ enum class AppletId : u32 {
     Extrapad           = 0x208,
     Memolib            = 0x209,
     Application        = 0x300,
+    AnyLibraryApplet   = 0x400,
     SoftwareKeyboard2  = 0x401,
 };
 
@@ -96,8 +97,26 @@ void GetSharedFont(Service::Interface* self);
  */
 void NotifyToWait(Service::Interface* self);
 
+/**
+ * APT::GetLockHandle service function
+ *  Inputs:
+ *      1 : Applet attributes
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      2 : Applet attributes
+ *      3 : Power button state
+ *      4 : IPC handle descriptor
+ *      5 : APT mutex handle
+ */
 void GetLockHandle(Service::Interface* self);
 
+/**
+ * APT::Enable service function
+ *  Inputs:
+ *      1 : Applet attributes
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
 void Enable(Service::Interface* self);
 
 /**
@@ -284,6 +303,17 @@ void GetAppCpuTimeLimit(Service::Interface* self);
 void PrepareToStartLibraryApplet(Service::Interface* self);
 
 /**
+ * APT::PreloadLibraryApplet service function
+ *  Inputs:
+ *      0 : Command header [0x00160040]
+ *      1 : Id of the applet to start
+ *  Outputs:
+ *      0 : Return header
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void PreloadLibraryApplet(Service::Interface* self);
+
+/**
  * APT::StartLibraryApplet service function
  *  Inputs:
  *      0 : Command header [0x001E0084]
diff --git a/src/core/hle/service/apt/apt_a.cpp b/src/core/hle/service/apt/apt_a.cpp
index 88de339f9..22800c56f 100644
--- a/src/core/hle/service/apt/apt_a.cpp
+++ b/src/core/hle/service/apt/apt_a.cpp
@@ -21,6 +21,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x000D0080, ReceiveParameter,             "ReceiveParameter"},
     {0x000E0080, GlanceParameter,              "GlanceParameter"},
     {0x000F0100, CancelParameter,              "CancelParameter"},
+    {0x00160040, PreloadLibraryApplet,         "PreloadLibraryApplet"},
     {0x00180040, PrepareToStartLibraryApplet,  "PrepareToStartLibraryApplet"},
     {0x001E0084, StartLibraryApplet,           "StartLibraryApplet"},
     {0x003B0040, nullptr,                      "CancelLibraryApplet?"},
diff --git a/src/core/hle/service/apt/apt_s.cpp b/src/core/hle/service/apt/apt_s.cpp
index 396d1f04a..3ac6ff94f 100644
--- a/src/core/hle/service/apt/apt_s.cpp
+++ b/src/core/hle/service/apt/apt_s.cpp
@@ -32,9 +32,9 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x00130000, nullptr,               "GetPreparationState"},
     {0x00140040, nullptr,               "SetPreparationState"},
     {0x00150140, nullptr,               "PrepareToStartApplication"},
-    {0x00160040, nullptr,               "PreloadLibraryApplet"},
+    {0x00160040, PreloadLibraryApplet,  "PreloadLibraryApplet"},
     {0x00170040, nullptr,               "FinishPreloadingLibraryApplet"},
-    {0x00180040, nullptr,               "PrepareToStartLibraryApplet"},
+    {0x00180040, PrepareToStartLibraryApplet,"PrepareToStartLibraryApplet"},
     {0x00190040, nullptr,               "PrepareToStartSystemApplet"},
     {0x001A0000, nullptr,               "PrepareToStartNewestHomeMenu"},
     {0x001B00C4, nullptr,               "StartApplication"},
diff --git a/src/core/hle/service/apt/apt_u.cpp b/src/core/hle/service/apt/apt_u.cpp
index b724cd72b..146bfd595 100644
--- a/src/core/hle/service/apt/apt_u.cpp
+++ b/src/core/hle/service/apt/apt_u.cpp
@@ -33,7 +33,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x00130000, nullptr,                         "GetPreparationState"},
     {0x00140040, nullptr,                         "SetPreparationState"},
     {0x00150140, nullptr,                         "PrepareToStartApplication"},
-    {0x00160040, nullptr,                         "PreloadLibraryApplet"},
+    {0x00160040, PreloadLibraryApplet,            "PreloadLibraryApplet"},
     {0x00170040, nullptr,                         "FinishPreloadingLibraryApplet"},
     {0x00180040, PrepareToStartLibraryApplet,     "PrepareToStartLibraryApplet"},
     {0x00190040, nullptr,                         "PrepareToStartSystemApplet"},