[kernel, hle] Initial 22.0.0 kernel changes and cmd stubs (#3761)

- KProcess::Run() and CreateThread() SVC now write the current thread handle to TLS+0x110
- KPageTableBase::LockForMapDeviceAddressSpace now checks for a new KPageTableBase boolean, m_allowed_exec_device_mapping
- Stub `am` + `acc` + `settings` cmd module that needs to work for qlaunch

Thanks to: @alula and @yellows8
Source for changes: https://github.com/Atmosphere-NX/Atmosphere/pull/2744, https://switchbrew.org/, https://yls8.mtheall.com/

Co-authored-by: PavelBARABANOV <pavelbarabanov94@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3761
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/core/hle/service/set/settings_types.h

@@ -409,6 +409,13 @@ struct AccountNotificationSettings {
 static_assert(sizeof(AccountNotificationSettings) == 0x18,
               "AccountNotificationSettings is an invalid size");
 
+/// This is nn::settings::system::AccountUserSettings (stubbed)
+struct AccountUserSettings {
+    std::array<u8, 0x40> data;
+};
+static_assert(sizeof(AccountUserSettings) == 0x40,
+              "AccountUserSettings is an invalid size");
+
 /// This is nn::settings::factory::BatteryLot
 struct BatteryLot {
     std::array<char, 0x18> lot_number;

src/core/hle/service/set/system_settings_server.cpp

@@ -340,9 +340,9 @@ ISystemSettingsServer::ISystemSettingsServer(Core::System& system_)
         {306, nullptr, "GetPinCodeReregistrationGuideAccounts"}, //20.0.0+
         {307, nullptr, "SetPinCodeReregistrationGuideAccounts"}, //20.0.0+
         {315, C<&ISystemSettingsServer::GetHttpAuthConfigs>, "GetHttpAuthConfigs"}, //21.0.0+
-        {319, nullptr, "GetAccountUserSettings"}, //21.0.0+
+        {319, C<&ISystemSettingsServer::GetAccountUserSettings>, "GetAccountUserSettings"}, //21.0.0+
         {320, nullptr, "SetAccountUserSettings"}, //21.0.0+
-        {321, nullptr, "GetDefaultAccountUserSettings"}, //21.0.0+
+        {321, C<&ISystemSettingsServer::GetDefaultAccountUserSettings>, "GetDefaultAccountUserSettings"}, //21.0.0+
     };
     // clang-format on
 
@@ -1428,6 +1428,23 @@ Result ISystemSettingsServer::GetHttpAuthConfigs(Out<s32> out_count, OutBuffer<B
     R_SUCCEED();
 }
 
+Result ISystemSettingsServer::GetAccountUserSettings(
+    Out<u32> out_count,
+    OutLargeData<AccountUserSettings, BufferAttr_HipcMapAlias> out_settings) {
+    LOG_WARNING(Service_SET, "(STUBBED) called");
+
+    *out_count = 0;
+    *out_settings = {};
+    R_SUCCEED();
+}
+
+Result ISystemSettingsServer::GetDefaultAccountUserSettings(Out<AccountUserSettings> out_settings) {
+    LOG_WARNING(Service_SET, "(STUBBED) called");
+
+    *out_settings = {};
+    R_SUCCEED();
+}
+
 void ISystemSettingsServer::SetupSettings() {
     auto system_dir = Common::FS::GetEdenPath(Common::FS::EdenPath::NANDDir) / "system/save/8000000000000050";
     if (!LoadSettingsFile(system_dir, []() { return DefaultSystemSettings(); })) {

src/core/hle/service/set/system_settings_server.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -161,6 +161,10 @@ public:
     Result GetPanelCrcMode(Out<s32> out_panel_crc_mode);
     Result SetPanelCrcMode(s32 panel_crc_mode);
     Result GetHttpAuthConfigs(Out<s32> out_count, OutBuffer<BufferAttr_HipcMapAlias> out_configs);
+    Result GetAccountUserSettings(
+        Out<u32> out_count,
+        OutLargeData<AccountUserSettings, BufferAttr_HipcMapAlias> out_settings);
+    Result GetDefaultAccountUserSettings(Out<AccountUserSettings> out_settings);
 
 private:
     bool LoadSettingsFile(std::filesystem::path& path, auto&& default_func);