From 28b494dadc5cbcc74ba47784872b0b58ca89d7a3 Mon Sep 17 00:00:00 2001
From: gibbed <rick@gibbed.us>
Date: Mon, 26 Nov 2018 10:21:09 -0600
Subject: [PATCH] [Kernel] Stub XMsg app 0x000000FE/msg 0x00020021.

---
 src/xenia/kernel/xam/app_manager.cc         |  4 +-
 src/xenia/kernel/xam/apps/unknown_fe_app.cc | 55 +++++++++++++++++++++
 src/xenia/kernel/xam/apps/unknown_fe_app.h  | 34 +++++++++++++
 3 files changed, 92 insertions(+), 1 deletion(-)
 create mode 100644 src/xenia/kernel/xam/apps/unknown_fe_app.cc
 create mode 100644 src/xenia/kernel/xam/apps/unknown_fe_app.h

diff --git a/src/xenia/kernel/xam/app_manager.cc b/src/xenia/kernel/xam/app_manager.cc
index e83740776..fc18ca729 100644
--- a/src/xenia/kernel/xam/app_manager.cc
+++ b/src/xenia/kernel/xam/app_manager.cc
@@ -10,6 +10,7 @@
 #include "xenia/kernel/xam/app_manager.h"
 
 #include "xenia/kernel/kernel_state.h"
+#include "xenia/kernel/xam/apps/unknown_fe_app.h"
 #include "xenia/kernel/xam/apps/xgi_app.h"
 #include "xenia/kernel/xam/apps/xlivebase_app.h"
 #include "xenia/kernel/xam/apps/xmp_app.h"
@@ -24,9 +25,10 @@ App::App(KernelState* kernel_state, uint32_t app_id)
       app_id_(app_id) {}
 
 void AppManager::RegisterApps(KernelState* kernel_state, AppManager* manager) {
+  manager->RegisterApp(std::make_unique<apps::XmpApp>(kernel_state));
   manager->RegisterApp(std::make_unique<apps::XgiApp>(kernel_state));
   manager->RegisterApp(std::make_unique<apps::XLiveBaseApp>(kernel_state));
-  manager->RegisterApp(std::make_unique<apps::XmpApp>(kernel_state));
+  manager->RegisterApp(std::make_unique<apps::UnknownFEApp>(kernel_state));
 }
 
 void AppManager::RegisterApp(std::unique_ptr<App> app) {
diff --git a/src/xenia/kernel/xam/apps/unknown_fe_app.cc b/src/xenia/kernel/xam/apps/unknown_fe_app.cc
new file mode 100644
index 000000000..cb05a339e
--- /dev/null
+++ b/src/xenia/kernel/xam/apps/unknown_fe_app.cc
@@ -0,0 +1,55 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/kernel/xam/apps/unknown_fe_app.h"
+
+#include "xenia/base/logging.h"
+#include "xenia/base/threading.h"
+
+namespace xe {
+namespace kernel {
+namespace xam {
+namespace apps {
+
+UnknownFEApp::UnknownFEApp(KernelState* kernel_state)
+    : App(kernel_state, 0xFE) {}
+
+X_RESULT UnknownFEApp::DispatchMessageSync(uint32_t message,
+                                           uint32_t buffer_ptr,
+                                           uint32_t buffer_length) {
+  // NOTE: buffer_length may be zero or valid.
+  auto buffer = memory_->TranslateVirtual(buffer_ptr);
+  switch (message) {
+    case 0x00020021: {
+      struct message_data {
+        char unk_00[64];
+        xe::be<uint32_t> unk_40;  // KeGetCurrentProcessType() < 1 ? 1 : 0
+        xe::be<uint32_t> unk_44;  // ? output_ptr ?
+        xe::be<uint32_t> unk_48;  // ? overlapped_ptr ?
+      }* data = reinterpret_cast<message_data*>(buffer);
+      assert_true(buffer_length == sizeof(message_data));
+      auto unk = memory_->TranslateVirtual<xe::be<uint32_t>*>(data->unk_44);
+      *unk = 0;
+      XELOGD("UnknownFEApp(0x00020021)('%s', %.8X, %.8X, %.8X)", data->unk_00,
+             (uint32_t)data->unk_40, (uint32_t)data->unk_44,
+             (uint32_t)data->unk_48);
+      return X_ERROR_SUCCESS;
+    }
+  }
+  XELOGE(
+      "Unimplemented 0xFE message app=%.8X, msg=%.8X, arg1=%.8X, "
+      "arg2=%.8X",
+      app_id(), message, buffer_ptr, buffer_length);
+  return X_STATUS_UNSUCCESSFUL;
+}
+
+}  // namespace apps
+}  // namespace xam
+}  // namespace kernel
+}  // namespace xe
diff --git a/src/xenia/kernel/xam/apps/unknown_fe_app.h b/src/xenia/kernel/xam/apps/unknown_fe_app.h
new file mode 100644
index 000000000..f2d764f17
--- /dev/null
+++ b/src/xenia/kernel/xam/apps/unknown_fe_app.h
@@ -0,0 +1,34 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_KERNEL_XAM_APPS_UNKNOWN_FE_APP_H_
+#define XENIA_KERNEL_XAM_APPS_UNKNOWN_FE_APP_H_
+
+#include "xenia/kernel/kernel_state.h"
+#include "xenia/kernel/xam/app_manager.h"
+
+namespace xe {
+namespace kernel {
+namespace xam {
+namespace apps {
+
+class UnknownFEApp : public App {
+ public:
+  explicit UnknownFEApp(KernelState* kernel_state);
+
+  X_RESULT DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
+                               uint32_t buffer_length) override;
+};
+
+}  // namespace apps
+}  // namespace xam
+}  // namespace kernel
+}  // namespace xe
+
+#endif  // XENIA_KERNEL_XAM_APPS_UNKNOWN_FE_APP_H_