1 files changed, 105 insertions, 43 deletions

diff --git a/src/core/core.h b/src/core/core.h
index ffbfa91c3..1015e8847 100644
--- a/src/core/core.h
+++ b/src/core/core.h
@@ -5,56 +5,118 @@
 #pragma once
 
 #include <memory>
+#include <string>
+
 #include "common/common_types.h"
+#include "core/memory.h"
 
+class EmuWindow;
 class ARM_Interface;
 
-////////////////////////////////////////////////////////////////////////////////////////////////////
+namespace Loader {
+class AppLoader;
+}
 
 namespace Core {
 
-struct ThreadContext {
-    u32 cpu_registers[13];
-    u32 sp;
-    u32 lr;
-    u32 pc;
-    u32 cpsr;
-    u32 fpu_registers[64];
-    u32 fpscr;
-    u32 fpexc;
+class System {
+public:
+    /**
+     * Gets the instance of the System singleton class.
+     * @returns Reference to the instance of the System singleton class.
+     */
+    static System& GetInstance() {
+        return s_instance;
+    }
+
+    /// Enumeration representing the return values of the System Initialize and Load process.
+    enum class ResultStatus : u32 {
+        Success,                    ///< Succeeded
+        ErrorNotInitialized,        ///< Error trying to use core prior to initialization
+        ErrorGetLoader,             ///< Error finding the correct application loader
+        ErrorSystemMode,            ///< Error determining the system mode
+        ErrorLoader,                ///< Error loading the specified application
+        ErrorLoader_ErrorEncrypted, ///< Error loading the specified application due to encryption
+        ErrorLoader_ErrorInvalidFormat, ///< Error loading the specified application due to an
+                                        /// invalid format
+        ErrorVideoCore,                 ///< Error in the video core
+    };
+
+    /**
+     * Run the core CPU loop
+     * This function runs the core for the specified number of CPU instructions before trying to
+     * update hardware. This is much faster than SingleStep (and should be equivalent), as the CPU
+     * is not required to do a full dispatch with each instruction. NOTE: the number of instructions
+     * requested is not guaranteed to run, as this will be interrupted preemptively if a hardware
+     * update is requested (e.g. on a thread switch).
+     * @param tight_loop Number of instructions to execute.
+     * @return Result status, indicating whethor or not the operation succeeded.
+     */
+    ResultStatus RunLoop(int tight_loop = 1000);
+
+    /**
+     * Step the CPU one instruction
+     * @return Result status, indicating whethor or not the operation succeeded.
+     */
+    ResultStatus SingleStep();
+
+    /// Shutdown the emulated system.
+    void Shutdown();
+
+    /**
+     * Load an executable application.
+     * @param emu_window Pointer to the host-system window used for video output and keyboard input.
+     * @param filepath String path to the executable application to load on the host file system.
+     * @returns ResultStatus code, indicating if the operation succeeded.
+     */
+    ResultStatus Load(EmuWindow* emu_window, const std::string& filepath);
+
+    /**
+     * Indicates if the emulated system is powered on (all subsystems initialized and able to run an
+     * application).
+     * @returns True if the emulated system is powered on, otherwise false.
+     */
+    bool IsPoweredOn() const {
+        return cpu_core != nullptr;
+    }
+
+    /// Prepare the core emulation for a reschedule
+    void PrepareReschedule();
+
+    /**
+     * Gets a reference to the emulated CPU.
+     * @returns A reference to the emulated CPU.
+     */
+    ARM_Interface& CPU() {
+        return *cpu_core;
+    }
+
+private:
+    /**
+     * Initialize the emulated system.
+     * @param emu_window Pointer to the host-system window used for video output and keyboard input.
+     * @param system_mode The system mode.
+     * @return ResultStatus code, indicating if the operation succeeded.
+     */
+    ResultStatus Init(EmuWindow* emu_window, u32 system_mode);
+
+    /// Reschedule the core emulation
+    void Reschedule();
+
+    /// AppLoader used to load the current executing application
+    std::unique_ptr<Loader::AppLoader> app_loader;
+
+    ///< ARM11 CPU core
+    std::unique_ptr<ARM_Interface> cpu_core;
+
+    /// When true, signals that a reschedule should happen
+    bool reschedule_pending{};
+
+    static System s_instance;
 };
 
-extern std::unique_ptr<ARM_Interface> g_app_core; ///< ARM11 application core
-extern std::unique_ptr<ARM_Interface> g_sys_core; ///< ARM11 system (OS) core
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-/// Start the core
-void Start();
-
-/**
- * Run the core CPU loop
- * This function runs the core for the specified number of CPU instructions before trying to update
- * hardware. This is much faster than SingleStep (and should be equivalent), as the CPU is not
- * required to do a full dispatch with each instruction. NOTE: the number of instructions requested
- * is not guaranteed to run, as this will be interrupted preemptively if a hardware update is
- * requested (e.g. on a thread switch).
- */
-void RunLoop(int tight_loop = 1000);
-
-/// Step the CPU one instruction
-void SingleStep();
-
-/// Halt the core
-void Halt(const char* msg);
-
-/// Kill the core
-void Stop();
-
-/// Initialize the core
-void Init();
-
-/// Shutdown the core
-void Shutdown();
+static ARM_Interface& CPU() {
+    return System::GetInstance().CPU();
+}
 
-} // namespace
+} // namespace Core