NV: Implemented the nvdrv:a service and the /dev/nvmap device.

src/core/hle/service/nvdrv/nvdrv.h

@@ -0,0 +1,25 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+#include "common/common_types.h"
+#include "core/hle/service/service.h"
+
+namespace Service {
+namespace NVDRV {
+
+class nvdevice {
+public:
+    virtual ~nvdevice() = default;
+
+    virtual u32 ioctl(u32 command, const std::vector<u8>& input, std::vector<u8>& output) = 0;
+};
+
+/// Registers all NVDRV services with the specified service manager.
+void InstallInterfaces(SM::ServiceManager& service_manager);
+
+} // namespace NVDRV
+} // namespace Service