tio: implement SdCardObserver (finishes sysmodule)

stratosphere/TioServer/source/tio_sd_card_observer.hpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+
+namespace ams::tio {
+
+    using SdCardInsertionCallback = void(*)(bool inserted);
+
+    class SdCardObserver {
+        private:
+            bool m_inserted;
+            SdCardInsertionCallback m_callback;
+            os::ThreadType m_thread;
+        public:
+            constexpr SdCardObserver() : m_inserted(false), m_callback(nullptr), m_thread{} { /* ... */ }
+
+            bool IsSdCardInserted() const { return m_inserted; }
+        private:
+            static void ThreadEntry(void *arg) {
+                static_cast<SdCardObserver *>(arg)->ThreadFunc();
+            }
+
+            void ThreadFunc();
+        public:
+            void Initialize(void *thread_stack, size_t thread_stack_size);
+            void SetCallback(SdCardInsertionCallback callback);
+    };
+
+}