HLE: move SharedPage into Kernel

similar to config_mem, kernel is responsible for setting up this

src/core/hle/kernel/shared_page.h

@@ -0,0 +1,105 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+/**
+ * The shared page stores various runtime configuration settings. This memory page is
+ * read-only for user processes (there is a bit in the header that grants the process
+ * write access, according to 3dbrew; this is not emulated)
+ */
+
+#include <chrono>
+#include <ctime>
+#include <memory>
+#include "common/bit_field.h"
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "common/swap.h"
+#include "core/memory.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace CoreTiming {
+struct EventType;
+}
+
+namespace SharedPage {
+
+// See http://3dbrew.org/wiki/Configuration_Memory#Shared_Memory_Page_For_ARM11_Processes
+
+struct DateTime {
+    u64_le date_time;                  // 0
+    u64_le update_tick;                // 8
+    u64_le tick_to_second_coefficient; // 10
+    u64_le tick_offset;                // 18
+};
+static_assert(sizeof(DateTime) == 0x20, "Datetime size is wrong");
+
+union BatteryState {
+    u8 raw;
+    BitField<0, 1, u8> is_adapter_connected;
+    BitField<1, 1, u8> is_charging;
+    BitField<2, 3, u8> charge_level;
+};
+
+using MacAddress = std::array<u8, 6>;
+
+// Default MAC address in the Nintendo 3DS range
+constexpr MacAddress DefaultMac = {0x40, 0xF4, 0x07, 0x00, 0x00, 0x00};
+
+enum class WifiLinkLevel : u8 {
+    OFF = 0,
+    POOR = 1,
+    GOOD = 2,
+    BEST = 3,
+};
+
+struct SharedPageDef {
+    // Most of these names are taken from the 3dbrew page linked above.
+    u32_le date_time_counter; // 0
+    u8 running_hw;            // 4
+    /// "Microcontroller hardware info"
+    u8 mcu_hw_info;                      // 5
+    INSERT_PADDING_BYTES(0x20 - 0x6);    // 6
+    DateTime date_time_0;                // 20
+    DateTime date_time_1;                // 40
+    u8 wifi_macaddr[6];                  // 60
+    u8 wifi_link_level;                  // 66
+    u8 wifi_unknown2;                    // 67
+    INSERT_PADDING_BYTES(0x80 - 0x68);   // 68
+    float_le sliderstate_3d;             // 80
+    u8 ledstate_3d;                      // 84
+    BatteryState battery_state;          // 85
+    u8 unknown_value;                    // 86
+    INSERT_PADDING_BYTES(0xA0 - 0x87);   // 87
+    u64_le menu_title_id;                // A0
+    u64_le active_menu_title_id;         // A8
+    INSERT_PADDING_BYTES(0x1000 - 0xB0); // B0
+};
+static_assert(sizeof(SharedPageDef) == Memory::SHARED_PAGE_SIZE,
+              "Shared page structure size is wrong");
+
+class Handler {
+public:
+    Handler();
+
+    void SetMacAddress(const MacAddress&);
+
+    void SetWifiLinkLevel(WifiLinkLevel);
+
+    void Set3DLed(u8);
+
+    SharedPageDef& GetSharedPage();
+
+private:
+    u64 GetSystemTime() const;
+    void UpdateTimeCallback(u64 userdata, int cycles_late);
+    CoreTiming::EventType* update_time_event;
+    std::chrono::seconds init_time;
+
+    SharedPageDef shared_page;
+};
+
+} // namespace SharedPage