Android #156

kernel: implement remaining IPC syscalls

README.md

@@ -1,3 +1,11 @@
+| Pull Request | Commit | Title | Author | Merged? |
+|----|----|----|----|----|
+
+
+End of merge log. You can find the original README.md below the break.
+
+-----
+
 <!--
 SPDX-FileCopyrightText: 2018 yuzu Emulator Project
 SPDX-License-Identifier: GPL-2.0-or-later

dist/72-yuzu-input.rules

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: 2023 yuzu Emulator Project
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Allow systemd-logind to manage user access to hidraw with this file
+# On most systems, this file should be installed to /etc/udev/rules.d/72-yuzu-input.rules
+# Consult your distro if this is not the case
+
+# Switch Pro Controller (USB/Bluetooth)
+KERNEL=="hidraw*", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="2009", MODE="0660", TAG+="uaccess"
+KERNEL=="hidraw*", KERNELS=="*057e:2009*", MODE="0660", TAG+="uaccess"
+
+# Joy-Con L (Bluetooth)
+KERNEL=="hidraw*", KERNELS=="*057e:2006*", MODE="0660", TAG+="uaccess"
+
+# Joy-Con R (Bluetooth)
+KERNEL=="hidraw*", KERNELS=="*057e:2007*", MODE="0660", TAG+="uaccess"
+
+# Joy-Con Charging Grip (USB)
+KERNEL=="hidraw*", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="200e", MODE="0660", TAG+="uaccess"

src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/AddGameFolderDialogFragment.kt

@@ -14,8 +14,10 @@ import org.yuzu.yuzu_emu.R
 import org.yuzu.yuzu_emu.databinding.DialogAddFolderBinding
 import org.yuzu.yuzu_emu.model.GameDir
 import org.yuzu.yuzu_emu.model.GamesViewModel
+import org.yuzu.yuzu_emu.model.HomeViewModel
 
 class AddGameFolderDialogFragment : DialogFragment() {
+    private val homeViewModel: HomeViewModel by activityViewModels()
     private val gamesViewModel: GamesViewModel by activityViewModels()
 
     override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
@@ -30,6 +32,7 @@ class AddGameFolderDialogFragment : DialogFragment() {
             .setTitle(R.string.add_game_folder)
             .setPositiveButton(android.R.string.ok) { _: DialogInterface, _: Int ->
                 val newGameDir = GameDir(folderUriString!!, binding.deepScanSwitch.isChecked)
+                homeViewModel.setGamesDirSelected(true)
                 gamesViewModel.addFolder(newGameDir)
             }
             .setNegativeButton(android.R.string.cancel, null)

src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/SetupFragment.kt

@@ -4,6 +4,7 @@
 package org.yuzu.yuzu_emu.fragments
 
 import android.Manifest
+import android.annotation.SuppressLint
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
@@ -75,6 +76,8 @@ class SetupFragment : Fragment() {
         return binding.root
     }
 
+    // This is using the correct scope, lint is just acting up
+    @SuppressLint("UnsafeRepeatOnLifecycleDetector")
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         mainActivity = requireActivity() as MainActivity
 
@@ -206,7 +209,8 @@ class SetupFragment : Fragment() {
             )
         }
 
-        viewLifecycleOwner.lifecycleScope.launch {
+        viewLifecycleOwner.lifecycleScope.apply {
+            launch {
                 repeatOnLifecycle(Lifecycle.State.CREATED) {
                     homeViewModel.shouldPageForward.collect {
                         if (it) {
@@ -216,6 +220,17 @@ class SetupFragment : Fragment() {
                     }
                 }
             }
+            launch {
+                repeatOnLifecycle(Lifecycle.State.CREATED) {
+                    homeViewModel.gamesDirSelected.collect {
+                        if (it) {
+                            gamesDirCallback.onStepCompleted()
+                            homeViewModel.setGamesDirSelected(false)
+                        }
+                    }
+                }
+            }
+        }
 
         binding.viewPager2.apply {
             adapter = SetupAdapter(requireActivity() as AppCompatActivity, pages)
@@ -339,7 +354,6 @@ class SetupFragment : Fragment() {
         registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { result ->
             if (result != null) {
                 mainActivity.processGamesDir(result)
-                gamesDirCallback.onStepCompleted()
             }
         }
 

src/android/app/src/main/java/org/yuzu/yuzu_emu/model/GamesViewModel.kt

@@ -133,7 +133,7 @@ class GamesViewModel : ViewModel() {
         viewModelScope.launch {
             withContext(Dispatchers.IO) {
                 NativeConfig.addGameDir(gameDir)
-                getGameDirs()
+                getGameDirs(true)
             }
         }
 

src/android/app/src/main/java/org/yuzu/yuzu_emu/model/HomeViewModel.kt

@@ -6,6 +6,7 @@ package org.yuzu.yuzu_emu.model
 import androidx.lifecycle.ViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 
 class HomeViewModel : ViewModel() {
     val navigationVisible: StateFlow<Pair<Boolean, Boolean>> get() = _navigationVisible
@@ -17,6 +18,9 @@ class HomeViewModel : ViewModel() {
     val shouldPageForward: StateFlow<Boolean> get() = _shouldPageForward
     private val _shouldPageForward = MutableStateFlow(false)
 
+    private val _gamesDirSelected = MutableStateFlow(false)
+    val gamesDirSelected get() = _gamesDirSelected.asStateFlow()
+
     var navigatedToSetup = false
 
     fun setNavigationVisibility(visible: Boolean, animated: Boolean) {
@@ -36,4 +40,8 @@ class HomeViewModel : ViewModel() {
     fun setShouldPageForward(pageForward: Boolean) {
         _shouldPageForward.value = pageForward
     }
+
+    fun setGamesDirSelected(selected: Boolean) {
+        _gamesDirSelected.value = selected
+    }
 }

src/common/settings.cpp

@@ -160,12 +160,16 @@ static bool is_nce_enabled = false;
 
 void SetNceEnabled(bool is_39bit) {
     const bool is_nce_selected = values.cpu_backend.GetValue() == CpuBackend::Nce;
-    is_nce_enabled = IsFastmemEnabled() && is_nce_selected && is_39bit;
+    if (is_nce_selected && !IsFastmemEnabled()) {
-    if (is_nce_selected && !is_nce_enabled) {
+        LOG_WARNING(Common, "Fastmem is required to natively execute code in a performant manner, "
+                            "falling back to Dynarmic");
+    }
+    if (is_nce_selected && !is_39bit) {
         LOG_WARNING(
             Common,
             "Program does not utilize 39-bit address space, unable to natively execute code");
     }
+    is_nce_enabled = IsFastmemEnabled() && is_nce_selected && is_39bit;
 }
 
 bool IsNceEnabled() {

src/common/settings.h

@@ -180,14 +180,20 @@ struct Values {
                                              &use_speed_limit};
 
     // Cpu
-    SwitchableSetting<CpuBackend, true> cpu_backend{
+    SwitchableSetting<CpuBackend, true> cpu_backend{linkage,
-        linkage,         CpuBackend::Dynarmic, CpuBackend::Dynarmic,
 #ifdef HAS_NCE
                                                     CpuBackend::Nce,
 #else
                                                     CpuBackend::Dynarmic,
 #endif
-        "cpu_backend",   Category::Cpu};
+                                                    CpuBackend::Dynarmic,
+#ifdef HAS_NCE
+                                                    CpuBackend::Nce,
+#else
+                                                    CpuBackend::Dynarmic,
+#endif
+                                                    "cpu_backend",
+                                                    Category::Cpu};
     SwitchableSetting<CpuAccuracy, true> cpu_accuracy{linkage,           CpuAccuracy::Auto,
                                                       CpuAccuracy::Auto, CpuAccuracy::Paranoid,
                                                       "cpu_accuracy",    Category::Cpu};

src/core/CMakeLists.txt

@@ -251,10 +251,16 @@ add_library(core STATIC
     hle/kernel/k_hardware_timer.h
     hle/kernel/k_interrupt_manager.cpp
     hle/kernel/k_interrupt_manager.h
+    hle/kernel/k_light_client_session.cpp
+    hle/kernel/k_light_client_session.h
     hle/kernel/k_light_condition_variable.cpp
     hle/kernel/k_light_condition_variable.h
     hle/kernel/k_light_lock.cpp
     hle/kernel/k_light_lock.h
+    hle/kernel/k_light_server_session.cpp
+    hle/kernel/k_light_server_session.h
+    hle/kernel/k_light_session.cpp
+    hle/kernel/k_light_session.h
     hle/kernel/k_memory_block.h
     hle/kernel/k_memory_block_manager.cpp
     hle/kernel/k_memory_block_manager.h
@@ -543,6 +549,8 @@ add_library(core STATIC
     hle/service/hid/xcd.cpp
     hle/service/hid/xcd.h
     hle/service/hid/errors.h
+    hle/service/hid/controllers/applet_resource.cpp
+    hle/service/hid/controllers/applet_resource.h
     hle/service/hid/controllers/console_six_axis.cpp
     hle/service/hid/controllers/console_six_axis.h
     hle/service/hid/controllers/controller_base.cpp

src/core/arm/debug.cpp

@@ -282,6 +282,8 @@ Loader::AppLoader::Modules FindModules(const Kernel::KProcess* process) {
 
                     // Ignore leading directories.
                     char* path_pointer = module_path.path.data();
+                    char* path_end =
+                        path_pointer + std::min(PathLengthMax, module_path.path_length);
 
                     for (s32 i = 0; i < std::min(PathLengthMax, module_path.path_length) &&
                                     module_path.path[i] != '\0';
@@ -292,7 +294,8 @@ Loader::AppLoader::Modules FindModules(const Kernel::KProcess* process) {
                     }
 
                     // Insert output.
-                    modules.emplace(svc_mem_info.base_address, path_pointer);
+                    modules.emplace(svc_mem_info.base_address,
+                                    std::string_view(path_pointer, path_end));
                 }
             }
         }

src/core/file_sys/fsmitm_romfsbuild.cpp

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <cstring>
+#include <span>
 #include <string_view>
 #include "common/alignment.h"
 #include "common/assert.h"
@@ -134,7 +135,7 @@ void RomFSBuildContext::VisitDirectory(VirtualDir romfs_dir, VirtualDir ext_dir,
 
         child->size = child->source->GetSize();
 
-        AddFile(parent, child);
+        AddFile(parent, std::move(child));
     }
 
     for (auto& child_romfs_dir : romfs_dir->GetSubdirectories()) {
@@ -163,36 +164,24 @@ void RomFSBuildContext::VisitDirectory(VirtualDir romfs_dir, VirtualDir ext_dir,
 
 bool RomFSBuildContext::AddDirectory(std::shared_ptr<RomFSBuildDirectoryContext> parent_dir_ctx,
                                      std::shared_ptr<RomFSBuildDirectoryContext> dir_ctx) {
-    // Check whether it's already in the known directories.
-    const auto [it, is_new] = directories.emplace(dir_ctx->path, nullptr);
-    if (!is_new) {
-        return false;
-    }
-
     // Add a new directory.
     num_dirs++;
     dir_table_size +=
         sizeof(RomFSDirectoryEntry) + Common::AlignUp(dir_ctx->path_len - dir_ctx->cur_path_ofs, 4);
-    dir_ctx->parent = parent_dir_ctx;
+    dir_ctx->parent = std::move(parent_dir_ctx);
-    it->second = dir_ctx;
+    directories.emplace_back(std::move(dir_ctx));
 
     return true;
 }
 
 bool RomFSBuildContext::AddFile(std::shared_ptr<RomFSBuildDirectoryContext> parent_dir_ctx,
                                 std::shared_ptr<RomFSBuildFileContext> file_ctx) {
-    // Check whether it's already in the known files.
-    const auto [it, is_new] = files.emplace(file_ctx->path, nullptr);
-    if (!is_new) {
-        return false;
-    }
-
     // Add a new file.
     num_files++;
     file_table_size +=
         sizeof(RomFSFileEntry) + Common::AlignUp(file_ctx->path_len - file_ctx->cur_path_ofs, 4);
-    file_ctx->parent = parent_dir_ctx;
+    file_ctx->parent = std::move(parent_dir_ctx);
-    it->second = file_ctx;
+    files.emplace_back(std::move(file_ctx));
 
     return true;
 }
@@ -201,7 +190,7 @@ RomFSBuildContext::RomFSBuildContext(VirtualDir base_, VirtualDir ext_)
     : base(std::move(base_)), ext(std::move(ext_)) {
     root = std::make_shared<RomFSBuildDirectoryContext>();
     root->path = "\0";
-    directories.emplace(root->path, root);
+    directories.emplace_back(root);
     num_dirs = 1;
     dir_table_size = 0x18;
 
@@ -210,28 +199,43 @@ RomFSBuildContext::RomFSBuildContext(VirtualDir base_, VirtualDir ext_)
 
 RomFSBuildContext::~RomFSBuildContext() = default;
 
-std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
+std::vector<std::pair<u64, VirtualFile>> RomFSBuildContext::Build() {
     const u64 dir_hash_table_entry_count = romfs_get_hash_table_count(num_dirs);
     const u64 file_hash_table_entry_count = romfs_get_hash_table_count(num_files);
     dir_hash_table_size = 4 * dir_hash_table_entry_count;
     file_hash_table_size = 4 * file_hash_table_entry_count;
 
-    // Assign metadata pointers
+    // Assign metadata pointers.
     RomFSHeader header{};
 
-    std::vector<u32> dir_hash_table(dir_hash_table_entry_count, ROMFS_ENTRY_EMPTY);
+    std::vector<u8> metadata(file_hash_table_size + file_table_size + dir_hash_table_size +
-    std::vector<u32> file_hash_table(file_hash_table_entry_count, ROMFS_ENTRY_EMPTY);
+                             dir_table_size);
+    u32* const dir_hash_table_pointer = reinterpret_cast<u32*>(metadata.data());
+    u8* const dir_table_pointer = metadata.data() + dir_hash_table_size;
+    u32* const file_hash_table_pointer =
+        reinterpret_cast<u32*>(metadata.data() + dir_hash_table_size + dir_table_size);
+    u8* const file_table_pointer =
+        metadata.data() + dir_hash_table_size + dir_table_size + file_hash_table_size;
 
-    std::vector<u8> dir_table(dir_table_size);
+    std::span<u32> dir_hash_table(dir_hash_table_pointer, dir_hash_table_entry_count);
-    std::vector<u8> file_table(file_table_size);
+    std::span<u32> file_hash_table(file_hash_table_pointer, file_hash_table_entry_count);
+    std::span<u8> dir_table(dir_table_pointer, dir_table_size);
+    std::span<u8> file_table(file_table_pointer, file_table_size);
 
-    std::shared_ptr<RomFSBuildFileContext> cur_file;
+    // Initialize hash tables.
+    std::memset(dir_hash_table.data(), 0xFF, dir_hash_table.size_bytes());
+    std::memset(file_hash_table.data(), 0xFF, file_hash_table.size_bytes());
+
+    // Sort tables by name.
+    std::sort(files.begin(), files.end(),
+              [](const auto& a, const auto& b) { return a->path < b->path; });
+    std::sort(directories.begin(), directories.end(),
+              [](const auto& a, const auto& b) { return a->path < b->path; });
 
     // Determine file offsets.
     u32 entry_offset = 0;
     std::shared_ptr<RomFSBuildFileContext> prev_file = nullptr;
-    for (const auto& it : files) {
+    for (const auto& cur_file : files) {
-        cur_file = it.second;
         file_partition_size = Common::AlignUp(file_partition_size, 16);
         cur_file->offset = file_partition_size;
         file_partition_size += cur_file->size;
@@ -243,34 +247,48 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
     }
     // Assign deferred parent/sibling ownership.
     for (auto it = files.rbegin(); it != files.rend(); ++it) {
-        cur_file = it->second;
+        auto& cur_file = *it;
         cur_file->sibling = cur_file->parent->file;
         cur_file->parent->file = cur_file;
     }
 
-    std::shared_ptr<RomFSBuildDirectoryContext> cur_dir;
-
     // Determine directory offsets.
     entry_offset = 0;
-    for (const auto& it : directories) {
+    for (const auto& cur_dir : directories) {
-        cur_dir = it.second;
         cur_dir->entry_offset = entry_offset;
         entry_offset +=
             static_cast<u32>(sizeof(RomFSDirectoryEntry) +
                              Common::AlignUp(cur_dir->path_len - cur_dir->cur_path_ofs, 4));
     }
     // Assign deferred parent/sibling ownership.
-    for (auto it = directories.rbegin(); it->second != root; ++it) {
+    for (auto it = directories.rbegin(); (*it) != root; ++it) {
-        cur_dir = it->second;
+        auto& cur_dir = *it;
         cur_dir->sibling = cur_dir->parent->child;
         cur_dir->parent->child = cur_dir;
     }
 
-    std::multimap<u64, VirtualFile> out;
+    // Create output map.
+    std::vector<std::pair<u64, VirtualFile>> out;
+    out.reserve(num_files + 2);
+
+    // Set header fields.
+    header.header_size = sizeof(RomFSHeader);
+    header.file_hash_table_size = file_hash_table_size;
+    header.file_table_size = file_table_size;
+    header.dir_hash_table_size = dir_hash_table_size;
+    header.dir_table_size = dir_table_size;
+    header.file_partition_ofs = ROMFS_FILEPARTITION_OFS;
+    header.dir_hash_table_ofs = Common::AlignUp(header.file_partition_ofs + file_partition_size, 4);
+    header.dir_table_ofs = header.dir_hash_table_ofs + header.dir_hash_table_size;
+    header.file_hash_table_ofs = header.dir_table_ofs + header.dir_table_size;
+    header.file_table_ofs = header.file_hash_table_ofs + header.file_hash_table_size;
+
+    std::vector<u8> header_data(sizeof(RomFSHeader));
+    std::memcpy(header_data.data(), &header, header_data.size());
+    out.emplace_back(0, std::make_shared<VectorVfsFile>(std::move(header_data)));
 
     // Populate file tables.
-    for (const auto& it : files) {
+    for (const auto& cur_file : files) {
-        cur_file = it.second;
         RomFSFileEntry cur_entry{};
 
         cur_entry.parent = cur_file->parent->entry_offset;
@@ -287,7 +305,7 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
 
         cur_entry.name_size = name_size;
 
-        out.emplace(cur_file->offset + ROMFS_FILEPARTITION_OFS, std::move(cur_file->source));
+        out.emplace_back(cur_file->offset + ROMFS_FILEPARTITION_OFS, std::move(cur_file->source));
         std::memcpy(file_table.data() + cur_file->entry_offset, &cur_entry, sizeof(RomFSFileEntry));
         std::memset(file_table.data() + cur_file->entry_offset + sizeof(RomFSFileEntry), 0,
                     Common::AlignUp(cur_entry.name_size, 4));
@@ -296,8 +314,7 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
     }
 
     // Populate dir tables.
-    for (const auto& it : directories) {
+    for (const auto& cur_dir : directories) {
-        cur_dir = it.second;
         RomFSDirectoryEntry cur_entry{};
 
         cur_entry.parent = cur_dir == root ? 0 : cur_dir->parent->entry_offset;
@@ -323,34 +340,13 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
                     cur_dir->path.data() + cur_dir->cur_path_ofs, name_size);
     }
 
-    // Set header fields.
+    // Write metadata.
-    header.header_size = sizeof(RomFSHeader);
+    out.emplace_back(header.dir_hash_table_ofs,
-    header.file_hash_table_size = file_hash_table_size;
+                     std::make_shared<VectorVfsFile>(std::move(metadata)));
-    header.file_table_size = file_table_size;
-    header.dir_hash_table_size = dir_hash_table_size;
-    header.dir_table_size = dir_table_size;
-    header.file_partition_ofs = ROMFS_FILEPARTITION_OFS;
-    header.dir_hash_table_ofs = Common::AlignUp(header.file_partition_ofs + file_partition_size, 4);
-    header.dir_table_ofs = header.dir_hash_table_ofs + header.dir_hash_table_size;
-    header.file_hash_table_ofs = header.dir_table_ofs + header.dir_table_size;
-    header.file_table_ofs = header.file_hash_table_ofs + header.file_hash_table_size;
 
-    std::vector<u8> header_data(sizeof(RomFSHeader));
+    // Sort the output.
-    std::memcpy(header_data.data(), &header, header_data.size());
+    std::sort(out.begin(), out.end(),
-    out.emplace(0, std::make_shared<VectorVfsFile>(std::move(header_data)));
+              [](const auto& a, const auto& b) { return a.first < b.first; });
-
-    std::vector<u8> metadata(file_hash_table_size + file_table_size + dir_hash_table_size +
-                             dir_table_size);
-    std::size_t index = 0;
-    std::memcpy(metadata.data(), dir_hash_table.data(), dir_hash_table.size() * sizeof(u32));
-    index += dir_hash_table.size() * sizeof(u32);
-    std::memcpy(metadata.data() + index, dir_table.data(), dir_table.size());
-    index += dir_table.size();
-    std::memcpy(metadata.data() + index, file_hash_table.data(),
-                file_hash_table.size() * sizeof(u32));
-    index += file_hash_table.size() * sizeof(u32);
-    std::memcpy(metadata.data() + index, file_table.data(), file_table.size());
-    out.emplace(header.dir_hash_table_ofs, std::make_shared<VectorVfsFile>(std::move(metadata)));
 
     return out;
 }

src/core/file_sys/fsmitm_romfsbuild.h

@@ -22,14 +22,14 @@ public:
     ~RomFSBuildContext();
 
     // This finalizes the context.
-    std::multimap<u64, VirtualFile> Build();
+    std::vector<std::pair<u64, VirtualFile>> Build();
 
 private:
     VirtualDir base;
     VirtualDir ext;
     std::shared_ptr<RomFSBuildDirectoryContext> root;
-    std::map<std::string, std::shared_ptr<RomFSBuildDirectoryContext>, std::less<>> directories;
+    std::vector<std::shared_ptr<RomFSBuildDirectoryContext>> directories;
-    std::map<std::string, std::shared_ptr<RomFSBuildFileContext>, std::less<>> files;
+    std::vector<std::shared_ptr<RomFSBuildFileContext>> files;
     u64 num_dirs = 0;
     u64 num_files = 0;
     u64 dir_table_size = 0;

src/core/file_sys/romfs.cpp

@@ -55,44 +55,68 @@ struct FileEntry {
 };
 static_assert(sizeof(FileEntry) == 0x20, "FileEntry has incorrect size.");
 
-template <typename Entry>
+struct RomFSTraversalContext {
-std::pair<Entry, std::string> GetEntry(const VirtualFile& file, std::size_t offset) {
+    RomFSHeader header;
-    Entry entry{};
+    VirtualFile file;
-    if (file->ReadObject(&entry, offset) != sizeof(Entry))
+    std::vector<u8> directory_meta;
+    std::vector<u8> file_meta;
+};
+
+template <typename EntryType, auto Member>
+std::pair<EntryType, std::string> GetEntry(const RomFSTraversalContext& ctx, size_t offset) {
+    const size_t entry_end = offset + sizeof(EntryType);
+    const std::vector<u8>& vec = ctx.*Member;
+    const size_t size = vec.size();
+    const u8* data = vec.data();
+    EntryType entry{};
+
+    if (entry_end > size) {
         return {};
-    std::string string(entry.name_length, '\0');
+    }
-    if (file->ReadArray(&string[0], string.size(), offset + sizeof(Entry)) != string.size())
+    std::memcpy(&entry, data + offset, sizeof(EntryType));
-        return {};
+
-    return {entry, string};
+    const size_t name_length = std::min(entry_end + entry.name_length, size) - entry_end;
+    std::string name(reinterpret_cast<const char*>(data + entry_end), name_length);
+
+    return {entry, std::move(name)};
 }
 
-void ProcessFile(const VirtualFile& file, std::size_t file_offset, std::size_t data_offset,
+std::pair<DirectoryEntry, std::string> GetDirectoryEntry(const RomFSTraversalContext& ctx,
-                 u32 this_file_offset, std::shared_ptr<VectorVfsDirectory>& parent) {
+                                                         size_t directory_offset) {
-    while (this_file_offset != ROMFS_ENTRY_EMPTY) {
+    return GetEntry<DirectoryEntry, &RomFSTraversalContext::directory_meta>(ctx, directory_offset);
-        auto entry = GetEntry<FileEntry>(file, file_offset + this_file_offset);
+}
 
-        parent->AddFile(std::make_shared<OffsetVfsFile>(
+std::pair<FileEntry, std::string> GetFileEntry(const RomFSTraversalContext& ctx,
-            file, entry.first.size, entry.first.offset + data_offset, entry.second));
+                                               size_t file_offset) {
+    return GetEntry<FileEntry, &RomFSTraversalContext::file_meta>(ctx, file_offset);
+}
+
+void ProcessFile(const RomFSTraversalContext& ctx, u32 this_file_offset,
+                 std::shared_ptr<VectorVfsDirectory>& parent) {
+    while (this_file_offset != ROMFS_ENTRY_EMPTY) {
+        auto entry = GetFileEntry(ctx, this_file_offset);
+
+        parent->AddFile(std::make_shared<OffsetVfsFile>(ctx.file, entry.first.size,
+                                                        entry.first.offset + ctx.header.data_offset,
+                                                        std::move(entry.second)));
 
         this_file_offset = entry.first.sibling;
     }
 }
 
-void ProcessDirectory(const VirtualFile& file, std::size_t dir_offset, std::size_t file_offset,
+void ProcessDirectory(const RomFSTraversalContext& ctx, u32 this_dir_offset,
-                      std::size_t data_offset, u32 this_dir_offset,
                       std::shared_ptr<VectorVfsDirectory>& parent) {
     while (this_dir_offset != ROMFS_ENTRY_EMPTY) {
-        auto entry = GetEntry<DirectoryEntry>(file, dir_offset + this_dir_offset);
+        auto entry = GetDirectoryEntry(ctx, this_dir_offset);
         auto current = std::make_shared<VectorVfsDirectory>(
             std::vector<VirtualFile>{}, std::vector<VirtualDir>{}, entry.second);
 
         if (entry.first.child_file != ROMFS_ENTRY_EMPTY) {
-            ProcessFile(file, file_offset, data_offset, entry.first.child_file, current);
+            ProcessFile(ctx, entry.first.child_file, current);
         }
 
         if (entry.first.child_dir != ROMFS_ENTRY_EMPTY) {
-            ProcessDirectory(file, dir_offset, file_offset, data_offset, entry.first.child_dir,
+            ProcessDirectory(ctx, entry.first.child_dir, current);
-                             current);
         }
 
         parent->AddDirectory(current);
@@ -107,22 +131,25 @@ VirtualDir ExtractRomFS(VirtualFile file) {
         return root_container;
     }
 
-    RomFSHeader header{};
+    RomFSTraversalContext ctx{};
-    if (file->ReadObject(&header) != sizeof(RomFSHeader)) {
+
-        return root_container;
+    if (file->ReadObject(&ctx.header) != sizeof(RomFSHeader)) {
+        return nullptr;
     }
 
-    if (header.header_size != sizeof(RomFSHeader)) {
+    if (ctx.header.header_size != sizeof(RomFSHeader)) {
-        return root_container;
+        return nullptr;
     }
 
-    const u64 file_offset = header.file_meta.offset;
+    ctx.file = file;
-    const u64 dir_offset = header.directory_meta.offset;
+    ctx.directory_meta =
+        file->ReadBytes(ctx.header.directory_meta.size, ctx.header.directory_meta.offset);
+    ctx.file_meta = file->ReadBytes(ctx.header.file_meta.size, ctx.header.file_meta.offset);
 
-    ProcessDirectory(file, dir_offset, file_offset, header.data_offset, 0, root_container);
+    ProcessDirectory(ctx, 0, root_container);
 
     if (auto root = root_container->GetSubdirectory(""); root) {
-        return std::make_shared<CachedVfsDirectory>(std::move(root));
+        return root;
     }
 
     ASSERT(false);

src/core/file_sys/vfs_concat.cpp

@@ -59,8 +59,8 @@ VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(std::string&& name,
     return VirtualFile(new ConcatenatedVfsFile(std::move(name), std::move(concatenation_map)));
 }
 
-VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte, std::string&& name,
+VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(
-                                                      std::multimap<u64, VirtualFile>&& files) {
+    u8 filler_byte, std::string&& name, std::vector<std::pair<u64, VirtualFile>>&& files) {
     // Fold trivial cases.
     if (files.empty()) {
         return nullptr;

src/core/file_sys/vfs_concat.h

@@ -37,7 +37,7 @@ public:
     /// Convenience function that turns a map of offsets to files into a concatenated file, filling
     /// gaps with a given filler byte.
     static VirtualFile MakeConcatenatedFile(u8 filler_byte, std::string&& name,
-                                            std::multimap<u64, VirtualFile>&& files);
+                                            std::vector<std::pair<u64, VirtualFile>>&& files);
 
     std::string GetName() const override;
     std::size_t GetSize() const override;

src/core/file_sys/vfs_layered.cpp

@@ -3,6 +3,7 @@
 
 #include <algorithm>
 #include <set>
+#include <unordered_set>
 #include <utility>
 #include "core/file_sys/vfs_layered.h"
 
@@ -59,13 +60,12 @@ std::string LayeredVfsDirectory::GetFullPath() const {
 
 std::vector<VirtualFile> LayeredVfsDirectory::GetFiles() const {
     std::vector<VirtualFile> out;
-    std::set<std::string, std::less<>> out_names;
+    std::unordered_set<std::string> out_names;
 
     for (const auto& layer : dirs) {
         for (auto& file : layer->GetFiles()) {
-            auto file_name = file->GetName();
+            const auto [it, is_new] = out_names.emplace(file->GetName());
-            if (!out_names.contains(file_name)) {
+            if (is_new) {
-                out_names.emplace(std::move(file_name));
                 out.emplace_back(std::move(file));
             }
         }
@@ -75,18 +75,19 @@ std::vector<VirtualFile> LayeredVfsDirectory::GetFiles() const {
 }
 
 std::vector<VirtualDir> LayeredVfsDirectory::GetSubdirectories() const {
-    std::vector<std::string> names;
+    std::vector<VirtualDir> out;
+    std::unordered_set<std::string> out_names;
+
     for (const auto& layer : dirs) {
         for (const auto& sd : layer->GetSubdirectories()) {
-            if (std::find(names.begin(), names.end(), sd->GetName()) == names.end())
+            out_names.emplace(sd->GetName());
-                names.push_back(sd->GetName());
         }
     }
 
-    std::vector<VirtualDir> out;
+    out.reserve(out_names.size());
-    out.reserve(names.size());
+    for (const auto& subdir : out_names) {
-    for (const auto& subdir : names)
         out.emplace_back(GetSubdirectory(subdir));
+    }
 
     return out;
 }

src/core/hle/kernel/k_client_port.cpp

@@ -3,6 +3,7 @@
 
 #include "common/scope_exit.h"
 #include "core/hle/kernel/k_client_port.h"
+#include "core/hle/kernel/k_light_session.h"
 #include "core/hle/kernel/k_port.h"
 #include "core/hle/kernel/k_scheduler.h"
 #include "core/hle/kernel/k_scoped_resource_reservation.h"
@@ -63,6 +64,7 @@ Result KClientPort::CreateSession(KClientSession** out) {
     R_UNLESS(session_reservation.Succeeded(), ResultLimitReached);
 
     // Allocate a session normally.
+    // TODO: Dynamic resource limits
     session = KSession::Create(m_kernel);
 
     // Check that we successfully created a session.
@@ -119,4 +121,71 @@ Result KClientPort::CreateSession(KClientSession** out) {
     R_SUCCEED();
 }
 
+Result KClientPort::CreateLightSession(KLightClientSession** out) {
+    // Declare the session we're going to allocate.
+    KLightSession* session{};
+
+    // Reserve a new session from the resource limit.
+    KScopedResourceReservation session_reservation(GetCurrentProcessPointer(m_kernel),
+                                                   Svc::LimitableResource::SessionCountMax);
+    R_UNLESS(session_reservation.Succeeded(), ResultLimitReached);
+
+    // Allocate a session normally.
+    // TODO: Dynamic resource limits
+    session = KLightSession::Create(m_kernel);
+
+    // Check that we successfully created a session.
+    R_UNLESS(session != nullptr, ResultOutOfResource);
+
+    // Update the session counts.
+    {
+        ON_RESULT_FAILURE {
+            session->Close();
+        };
+
+        // Atomically increment the number of sessions.
+        s32 new_sessions;
+        {
+            const auto max = m_max_sessions;
+            auto cur_sessions = m_num_sessions.load(std::memory_order_acquire);
+            do {
+                R_UNLESS(cur_sessions < max, ResultOutOfSessions);
+                new_sessions = cur_sessions + 1;
+            } while (!m_num_sessions.compare_exchange_weak(cur_sessions, new_sessions,
+                                                           std::memory_order_relaxed));
+        }
+
+        // Atomically update the peak session tracking.
+        {
+            auto peak = m_peak_sessions.load(std::memory_order_acquire);
+            do {
+                if (peak >= new_sessions) {
+                    break;
+                }
+            } while (!m_peak_sessions.compare_exchange_weak(peak, new_sessions,
+                                                            std::memory_order_relaxed));
+        }
+    }
+
+    // Initialize the session.
+    session->Initialize(this, m_parent->GetName());
+
+    // Commit the session reservation.
+    session_reservation.Commit();
+
+    // Register the session.
+    KLightSession::Register(m_kernel, session);
+    ON_RESULT_FAILURE {
+        session->GetClientSession().Close();
+        session->GetServerSession().Close();
+    };
+
+    // Enqueue the session with our parent.
+    R_TRY(m_parent->EnqueueSession(std::addressof(session->GetServerSession())));
+
+    // We succeeded, so set the output.
+    *out = std::addressof(session->GetClientSession());
+    R_SUCCEED();
+}
+
 } // namespace Kernel

src/core/hle/kernel/k_client_port.h

@@ -11,6 +11,7 @@
 
 namespace Kernel {
 
+class KLightClientSession;
 class KClientSession;
 class KernelCore;
 class KPort;
@@ -51,6 +52,7 @@ public:
     bool IsSignaled() const override;
 
     Result CreateSession(KClientSession** out);
+    Result CreateLightSession(KLightClientSession** out);
 
 private:
     std::atomic<s32> m_num_sessions{};

src/core/hle/kernel/k_client_session.cpp

@@ -10,9 +10,7 @@
 
 namespace Kernel {
 
-static constexpr u32 MessageBufferSize = 0x100;
+KClientSession::KClientSession(KernelCore& kernel) : KAutoObject{kernel} {}
-
-KClientSession::KClientSession(KernelCore& kernel) : KAutoObjectWithSlabHeapAndContainer{kernel} {}
 KClientSession::~KClientSession() = default;
 
 void KClientSession::Destroy() {
@@ -22,18 +20,30 @@ void KClientSession::Destroy() {
 
 void KClientSession::OnServerClosed() {}
 
-Result KClientSession::SendSyncRequest() {
+Result KClientSession::SendSyncRequest(uintptr_t address, size_t size) {
     // Create a session request.
     KSessionRequest* request = KSessionRequest::Create(m_kernel);
     R_UNLESS(request != nullptr, ResultOutOfResource);
     SCOPE_EXIT({ request->Close(); });
 
     // Initialize the request.
-    request->Initialize(nullptr, GetInteger(GetCurrentThread(m_kernel).GetTlsAddress()),
+    request->Initialize(nullptr, address, size);
-                        MessageBufferSize);
 
     // Send the request.
-    R_RETURN(m_parent->GetServerSession().OnRequest(request));
+    R_RETURN(m_parent->OnRequest(request));
+}
+
+Result KClientSession::SendAsyncRequest(KEvent* event, uintptr_t address, size_t size) {
+    // Create a session request.
+    KSessionRequest* request = KSessionRequest::Create(m_kernel);
+    R_UNLESS(request != nullptr, ResultOutOfResource);
+    SCOPE_EXIT({ request->Close(); });
+
+    // Initialize the request.
+    request->Initialize(event, address, size);
+
+    // Send the request.
+    R_RETURN(m_parent->OnRequest(request));
 }
 
 } // namespace Kernel

src/core/hle/kernel/k_client_session.h

@@ -9,24 +9,12 @@
 #include "core/hle/kernel/slab_helpers.h"
 #include "core/hle/result.h"
 
-union Result;
-
-namespace Core::Memory {
-class Memory;
-}
-
-namespace Core::Timing {
-class CoreTiming;
-}
-
 namespace Kernel {
 
 class KernelCore;
 class KSession;
-class KThread;
 
-class KClientSession final
+class KClientSession final : public KAutoObject {
-    : public KAutoObjectWithSlabHeapAndContainer<KClientSession, KAutoObjectWithList> {
     KERNEL_AUTOOBJECT_TRAITS(KClientSession, KAutoObject);
 
 public:
@@ -39,13 +27,13 @@ public:
     }
 
     void Destroy() override;
-    static void PostDestroy(uintptr_t arg) {}
 
     KSession* GetParent() const {
         return m_parent;
     }
 
-    Result SendSyncRequest();
+    Result SendSyncRequest(uintptr_t address, size_t size);
+    Result SendAsyncRequest(KEvent* event, uintptr_t address, size_t size);
 
     void OnServerClosed();
 

src/core/hle/kernel/k_light_client_session.cpp

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/kernel/k_light_client_session.h"
+#include "core/hle/kernel/k_light_session.h"
+#include "core/hle/kernel/k_thread.h"
+
+namespace Kernel {
+
+KLightClientSession::KLightClientSession(KernelCore& kernel) : KAutoObject(kernel) {}
+
+KLightClientSession::~KLightClientSession() = default;
+
+void KLightClientSession::Destroy() {
+    m_parent->OnClientClosed();
+}
+
+void KLightClientSession::OnServerClosed() {}
+
+Result KLightClientSession::SendSyncRequest(u32* data) {
+    // Get the request thread.
+    KThread* cur_thread = GetCurrentThreadPointer(m_kernel);
+
+    // Set the light data.
+    cur_thread->SetLightSessionData(data);
+
+    // Send the request.
+    R_RETURN(m_parent->OnRequest(cur_thread));
+}
+
+} // namespace Kernel

src/core/hle/kernel/k_light_client_session.h

@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/kernel/k_auto_object.h"
+#include "core/hle/result.h"
+
+namespace Kernel {
+
+class KLightSession;
+
+class KLightClientSession final : public KAutoObject {
+    KERNEL_AUTOOBJECT_TRAITS(KLightClientSession, KAutoObject);
+
+public:
+    explicit KLightClientSession(KernelCore& kernel);
+    ~KLightClientSession();
+
+    void Initialize(KLightSession* parent) {
+        // Set member variables.
+        m_parent = parent;
+    }
+
+    virtual void Destroy() override;
+
+    const KLightSession* GetParent() const {
+        return m_parent;
+    }
+
+    Result SendSyncRequest(u32* data);
+
+    void OnServerClosed();
+
+private:
+    KLightSession* m_parent;
+};
+
+} // namespace Kernel

src/core/hle/kernel/k_light_server_session.cpp

@@ -0,0 +1,247 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/kernel/k_light_server_session.h"
+#include "core/hle/kernel/k_light_session.h"
+#include "core/hle/kernel/k_thread.h"
+#include "core/hle/kernel/k_thread_queue.h"
+#include "core/hle/kernel/svc_results.h"
+
+namespace Kernel {
+
+namespace {
+
+constexpr u64 InvalidThreadId = std::numeric_limits<u64>::max();
+
+class ThreadQueueImplForKLightServerSessionRequest final : public KThreadQueue {
+private:
+    KThread::WaiterList* m_wait_list;
+
+public:
+    ThreadQueueImplForKLightServerSessionRequest(KernelCore& kernel, KThread::WaiterList* wl)
+        : KThreadQueue(kernel), m_wait_list(wl) {}
+
+    virtual void EndWait(KThread* waiting_thread, Result wait_result) override {
+        // Remove the thread from our wait list.
+        m_wait_list->erase(m_wait_list->iterator_to(*waiting_thread));
+
+        // Invoke the base end wait handler.
+        KThreadQueue::EndWait(waiting_thread, wait_result);
+    }
+
+    virtual void CancelWait(KThread* waiting_thread, Result wait_result,
+                            bool cancel_timer_task) override {
+        // Remove the thread from our wait list.
+        m_wait_list->erase(m_wait_list->iterator_to(*waiting_thread));
+
+        // Invoke the base cancel wait handler.
+        KThreadQueue::CancelWait(waiting_thread, wait_result, cancel_timer_task);
+    }
+};
+
+class ThreadQueueImplForKLightServerSessionReceive final : public KThreadQueue {
+private:
+    KThread** m_server_thread;
+
+public:
+    ThreadQueueImplForKLightServerSessionReceive(KernelCore& kernel, KThread** st)
+        : KThreadQueue(kernel), m_server_thread(st) {}
+
+    virtual void EndWait(KThread* waiting_thread, Result wait_result) override {
+        // Clear the server thread.
+        *m_server_thread = nullptr;
+
+        // Set the waiting thread as not cancelable.
+        waiting_thread->ClearCancellable();
+
+        // Invoke the base end wait handler.
+        KThreadQueue::EndWait(waiting_thread, wait_result);
+    }
+
+    virtual void CancelWait(KThread* waiting_thread, Result wait_result,
+                            bool cancel_timer_task) override {
+        // Clear the server thread.
+        *m_server_thread = nullptr;
+
+        // Set the waiting thread as not cancelable.
+        waiting_thread->ClearCancellable();
+
+        // Invoke the base cancel wait handler.
+        KThreadQueue::CancelWait(waiting_thread, wait_result, cancel_timer_task);
+    }
+};
+
+} // namespace
+
+KLightServerSession::KLightServerSession(KernelCore& kernel) : KAutoObject(kernel) {}
+KLightServerSession::~KLightServerSession() = default;
+
+void KLightServerSession::Destroy() {
+    this->CleanupRequests();
+
+    m_parent->OnServerClosed();
+}
+
+void KLightServerSession::OnClientClosed() {
+    this->CleanupRequests();
+}
+
+Result KLightServerSession::OnRequest(KThread* request_thread) {
+    ThreadQueueImplForKLightServerSessionRequest wait_queue(m_kernel,
+                                                            std::addressof(m_request_list));
+
+    // Send the request.
+    {
+        // Lock the scheduler.
+        KScopedSchedulerLock sl(m_kernel);
+
+        // Check that the server isn't closed.
+        R_UNLESS(!m_parent->IsServerClosed(), ResultSessionClosed);
+
+        // Check that the request thread isn't terminating.
+        R_UNLESS(!request_thread->IsTerminationRequested(), ResultTerminationRequested);
+
+        // Add the request thread to our list.
+        m_request_list.push_back(*request_thread);
+
+        // Begin waiting on the request.
+        request_thread->SetWaitReasonForDebugging(ThreadWaitReasonForDebugging::IPC);
+        request_thread->BeginWait(std::addressof(wait_queue));
+
+        // If we have a server thread, end its wait.
+        if (m_server_thread != nullptr) {
+            m_server_thread->EndWait(ResultSuccess);
+        }
+    }
+
+    // NOTE: Nintendo returns GetCurrentThread().GetWaitResult() here.
+    // This is technically incorrect, although it doesn't cause problems in practice
+    // because this is only ever called with request_thread = GetCurrentThreadPointer().
+    R_RETURN(request_thread->GetWaitResult());
+}
+
+Result KLightServerSession::ReplyAndReceive(u32* data) {
+    // Set the server context.
+    GetCurrentThread(m_kernel).SetLightSessionData(data);
+
+    // Reply, if we need to.
+    if (data[0] & KLightSession::ReplyFlag) {
+        KScopedSchedulerLock sl(m_kernel);
+
+        // Check that we're open.
+        R_UNLESS(!m_parent->IsClientClosed(), ResultSessionClosed);
+        R_UNLESS(!m_parent->IsServerClosed(), ResultSessionClosed);
+
+        // Check that we have a request to reply to.
+        R_UNLESS(m_current_request != nullptr, ResultInvalidState);
+
+        // Check that the server thread id is correct.
+        R_UNLESS(m_server_thread_id == GetCurrentThread(m_kernel).GetId(), ResultInvalidState);
+
+        // If we can reply, do so.
+        if (!m_current_request->IsTerminationRequested()) {
+            std::memcpy(m_current_request->GetLightSessionData(),
+                        GetCurrentThread(m_kernel).GetLightSessionData(), KLightSession::DataSize);
+            m_current_request->EndWait(ResultSuccess);
+        }
+
+        // Close our current request.
+        m_current_request->Close();
+
+        // Clear our current request.
+        m_current_request = nullptr;
+        m_server_thread_id = InvalidThreadId;
+    }
+
+    // Create the wait queue for our receive.
+    ThreadQueueImplForKLightServerSessionReceive wait_queue(m_kernel,
+                                                            std::addressof(m_server_thread));
+
+    // Receive.
+    while (true) {
+        // Try to receive a request.
+        {
+            KScopedSchedulerLock sl(m_kernel);
+
+            // Check that we aren't already receiving.
+            R_UNLESS(m_server_thread == nullptr, ResultInvalidState);
+            R_UNLESS(m_server_thread_id == InvalidThreadId, ResultInvalidState);
+
+            // Check that we're open.
+            R_UNLESS(!m_parent->IsClientClosed(), ResultSessionClosed);
+            R_UNLESS(!m_parent->IsServerClosed(), ResultSessionClosed);
+
+            // Check that we're not terminating.
+            R_UNLESS(!GetCurrentThread(m_kernel).IsTerminationRequested(),
+                     ResultTerminationRequested);
+
+            // If we have a request available, use it.
+            if (auto head = m_request_list.begin(); head != m_request_list.end()) {
+                // Set our current request.
+                m_current_request = std::addressof(*head);
+                m_current_request->Open();
+
+                // Set our server thread id.
+                m_server_thread_id = GetCurrentThread(m_kernel).GetId();
+
+                // Copy the client request data.
+                std::memcpy(GetCurrentThread(m_kernel).GetLightSessionData(),
+                            m_current_request->GetLightSessionData(), KLightSession::DataSize);
+
+                // We successfully received.
+                R_SUCCEED();
+            }
+
+            // We need to wait for a request to come in.
+
+            // Check if we were cancelled.
+            if (GetCurrentThread(m_kernel).IsWaitCancelled()) {
+                GetCurrentThread(m_kernel).ClearWaitCancelled();
+                R_THROW(ResultCancelled);
+            }
+
+            // Mark ourselves as cancellable.
+            GetCurrentThread(m_kernel).SetCancellable();
+
+            // Wait for a request to come in.
+            m_server_thread = GetCurrentThreadPointer(m_kernel);
+            GetCurrentThread(m_kernel).SetWaitReasonForDebugging(ThreadWaitReasonForDebugging::IPC);
+            GetCurrentThread(m_kernel).BeginWait(std::addressof(wait_queue));
+        }
+
+        // We waited to receive a request; if our wait failed, return the failing result.
+        R_TRY(GetCurrentThread(m_kernel).GetWaitResult());
+    }
+}
+
+void KLightServerSession::CleanupRequests() {
+    // Cleanup all pending requests.
+    {
+        KScopedSchedulerLock sl(m_kernel);
+
+        // Handle the current request.
+        if (m_current_request != nullptr) {
+            // Reply to the current request.
+            if (!m_current_request->IsTerminationRequested()) {
+                m_current_request->EndWait(ResultSessionClosed);
+            }
+
+            // Clear our current request.
+            m_current_request->Close();
+            m_current_request = nullptr;
+            m_server_thread_id = InvalidThreadId;
+        }
+
+        // Reply to all other requests.
+        for (auto& thread : m_request_list) {
+            thread.EndWait(ResultSessionClosed);
+        }
+
+        // Wait up our server thread, if we have one.
+        if (m_server_thread != nullptr) {
+            m_server_thread->EndWait(ResultSessionClosed);
+        }
+    }
+}
+
+} // namespace Kernel

src/core/hle/kernel/k_light_server_session.h

@@ -0,0 +1,49 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/kernel/k_auto_object.h"
+#include "core/hle/kernel/k_thread.h"
+#include "core/hle/result.h"
+
+namespace Kernel {
+
+class KLightSession;
+
+class KLightServerSession final : public KAutoObject,
+                                  public Common::IntrusiveListBaseNode<KLightServerSession> {
+    KERNEL_AUTOOBJECT_TRAITS(KLightServerSession, KAutoObject);
+
+private:
+    KLightSession* m_parent{};
+    KThread::WaiterList m_request_list{};
+    KThread* m_current_request{};
+    u64 m_server_thread_id{std::numeric_limits<u64>::max()};
+    KThread* m_server_thread{};
+
+public:
+    explicit KLightServerSession(KernelCore& kernel);
+    ~KLightServerSession();
+
+    void Initialize(KLightSession* parent) {
+        // Set member variables. */
+        m_parent = parent;
+    }
+
+    virtual void Destroy() override;
+
+    constexpr const KLightSession* GetParent() const {
+        return m_parent;
+    }
+
+    Result OnRequest(KThread* request_thread);
+    Result ReplyAndReceive(u32* data);
+
+    void OnClientClosed();
+
+private:
+    void CleanupRequests();
+};
+
+} // namespace Kernel

src/core/hle/kernel/k_light_session.cpp

@@ -0,0 +1,81 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/kernel/k_client_port.h"
+#include "core/hle/kernel/k_light_client_session.h"
+#include "core/hle/kernel/k_light_server_session.h"
+#include "core/hle/kernel/k_light_session.h"
+#include "core/hle/kernel/k_process.h"
+
+namespace Kernel {
+
+KLightSession::KLightSession(KernelCore& kernel)
+    : KAutoObjectWithSlabHeapAndContainer(kernel), m_server(kernel), m_client(kernel) {}
+KLightSession::~KLightSession() = default;
+
+void KLightSession::Initialize(KClientPort* client_port, uintptr_t name) {
+    // Increment reference count.
+    // Because reference count is one on creation, this will result
+    // in a reference count of two. Thus, when both server and client are closed
+    // this object will be destroyed.
+    this->Open();
+
+    // Create our sub sessions.
+    KAutoObject::Create(std::addressof(m_server));
+    KAutoObject::Create(std::addressof(m_client));
+
+    // Initialize our sub sessions.
+    m_server.Initialize(this);
+    m_client.Initialize(this);
+
+    // Set state and name.
+    m_state = State::Normal;
+    m_name = name;
+
+    // Set our owner process.
+    m_process = GetCurrentProcessPointer(m_kernel);
+    m_process->Open();
+
+    // Set our port.
+    m_port = client_port;
+    if (m_port != nullptr) {
+        m_port->Open();
+    }
+
+    // Mark initialized.
+    m_initialized = true;
+}
+
+void KLightSession::Finalize() {
+    if (m_port != nullptr) {
+        m_port->OnSessionFinalized();
+        m_port->Close();
+    }
+}
+
+void KLightSession::OnServerClosed() {
+    if (m_state == State::Normal) {
+        m_state = State::ServerClosed;
+        m_client.OnServerClosed();
+    }
+
+    this->Close();
+}
+
+void KLightSession::OnClientClosed() {
+    if (m_state == State::Normal) {
+        m_state = State::ClientClosed;
+        m_server.OnClientClosed();
+    }
+
+    this->Close();
+}
+
+void KLightSession::PostDestroy(uintptr_t arg) {
+    // Release the session count resource the owner process holds.
+    KProcess* owner = reinterpret_cast<KProcess*>(arg);
+    owner->ReleaseResource(Svc::LimitableResource::SessionCountMax, 1);
+    owner->Close();
+}
+
+} // namespace Kernel

src/core/hle/kernel/k_light_session.h

@@ -0,0 +1,86 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/kernel/k_light_client_session.h"
+#include "core/hle/kernel/k_light_server_session.h"
+#include "core/hle/kernel/slab_helpers.h"
+#include "core/hle/result.h"
+
+namespace Kernel {
+
+class KClientPort;
+class KProcess;
+
+// TODO: SupportDynamicExpansion for SlabHeap
+class KLightSession final
+    : public KAutoObjectWithSlabHeapAndContainer<KLightSession, KAutoObjectWithList> {
+    KERNEL_AUTOOBJECT_TRAITS(KLightSession, KAutoObject);
+
+private:
+    enum class State : u8 {
+        Invalid = 0,
+        Normal = 1,
+        ClientClosed = 2,
+        ServerClosed = 3,
+    };
+
+public:
+    static constexpr size_t DataSize = sizeof(u32) * 7;
+    static constexpr u32 ReplyFlag = (1U << 31);
+
+private:
+    KLightServerSession m_server;
+    KLightClientSession m_client;
+    State m_state{State::Invalid};
+    KClientPort* m_port{};
+    uintptr_t m_name{};
+    KProcess* m_process{};
+    bool m_initialized{};
+
+public:
+    explicit KLightSession(KernelCore& kernel);
+    ~KLightSession();
+
+    void Initialize(KClientPort* client_port, uintptr_t name);
+    void Finalize() override;
+
+    bool IsInitialized() const override {
+        return m_initialized;
+    }
+    uintptr_t GetPostDestroyArgument() const override {
+        return reinterpret_cast<uintptr_t>(m_process);
+    }
+
+    static void PostDestroy(uintptr_t arg);
+
+    void OnServerClosed();
+    void OnClientClosed();
+
+    bool IsServerClosed() const {
+        return m_state != State::Normal;
+    }
+    bool IsClientClosed() const {
+        return m_state != State::Normal;
+    }
+
+    Result OnRequest(KThread* request_thread) {
+        R_RETURN(m_server.OnRequest(request_thread));
+    }
+
+    KLightClientSession& GetClientSession() {
+        return m_client;
+    }
+    KLightServerSession& GetServerSession() {
+        return m_server;
+    }
+    const KLightClientSession& GetClientSession() const {
+        return m_client;
+    }
+    const KLightServerSession& GetServerSession() const {
+        return m_server;
+    }
+};
+
+} // namespace Kernel

src/core/hle/kernel/k_port.cpp

@@ -58,4 +58,13 @@ Result KPort::EnqueueSession(KServerSession* session) {
     R_SUCCEED();
 }
 
+Result KPort::EnqueueSession(KLightServerSession* session) {
+    KScopedSchedulerLock sl{m_kernel};
+
+    R_UNLESS(m_state == State::Normal, ResultPortClosed);
+
+    m_server.EnqueueSession(session);
+    R_SUCCEED();
+}
+
 } // namespace Kernel

src/core/hle/kernel/k_port.h

@@ -13,6 +13,7 @@
 
 namespace Kernel {
 
+class KLightServerSession;
 class KServerSession;
 
 class KPort final : public KAutoObjectWithSlabHeapAndContainer<KPort, KAutoObjectWithList> {
@@ -38,6 +39,7 @@ public:
     bool IsServerClosed() const;
 
     Result EnqueueSession(KServerSession* session);
+    Result EnqueueSession(KLightServerSession* session);
 
     KClientPort& GetClientPort() {
         return m_client;

src/core/hle/kernel/k_server_port.cpp

@@ -27,12 +27,14 @@ bool KServerPort::IsLight() const {
 void KServerPort::CleanupSessions() {
     // Ensure our preconditions are met.
     if (this->IsLight()) {
-        UNIMPLEMENTED();
+        ASSERT(m_session_list.empty());
+    } else {
+        ASSERT(m_light_session_list.empty());
     }
 
     // Cleanup the session list.
     while (true) {
-        // Get the last session in the list
+        // Get the last session in the list.
         KServerSession* session = nullptr;
         {
             KScopedSchedulerLock sl{m_kernel};
@@ -49,6 +51,26 @@ void KServerPort::CleanupSessions() {
             break;
         }
     }
+
+    // Cleanup the light session list.
+    while (true) {
+        // Get the last session in the list.
+        KLightServerSession* session = nullptr;
+        {
+            KScopedSchedulerLock sl{m_kernel};
+            if (!m_light_session_list.empty()) {
+                session = std::addressof(m_light_session_list.front());
+                m_light_session_list.pop_front();
+            }
+        }
+
+        // Close the session.
+        if (session != nullptr) {
+            session->Close();
+        } else {
+            break;
+        }
+    }
 }
 
 void KServerPort::Destroy() {
@@ -64,8 +86,7 @@ void KServerPort::Destroy() {
 
 bool KServerPort::IsSignaled() const {
     if (this->IsLight()) {
-        UNIMPLEMENTED();
+        return !m_light_session_list.empty();
-        return false;
     } else {
         return !m_session_list.empty();
     }
@@ -83,6 +104,18 @@ void KServerPort::EnqueueSession(KServerSession* session) {
     }
 }
 
+void KServerPort::EnqueueSession(KLightServerSession* session) {
+    ASSERT(this->IsLight());
+
+    KScopedSchedulerLock sl{m_kernel};
+
+    // Add the session to our queue.
+    m_light_session_list.push_back(*session);
+    if (m_light_session_list.size() == 1) {
+        this->NotifyAvailable();
+    }
+}
+
 KServerSession* KServerPort::AcceptSession() {
     ASSERT(!this->IsLight());
 
@@ -98,4 +131,19 @@ KServerSession* KServerPort::AcceptSession() {
     return session;
 }
 
+KLightServerSession* KServerPort::AcceptLightSession() {
+    ASSERT(this->IsLight());
+
+    KScopedSchedulerLock sl{m_kernel};
+
+    // Return the first session in the list.
+    if (m_light_session_list.empty()) {
+        return nullptr;
+    }
+
+    KLightServerSession* session = std::addressof(m_light_session_list.front());
+    m_light_session_list.pop_front();
+    return session;
+}
+
 } // namespace Kernel

src/core/hle/kernel/k_server_port.h

@@ -9,6 +9,7 @@
 
 #include "common/intrusive_list.h"
 
+#include "core/hle/kernel/k_light_server_session.h"
 #include "core/hle/kernel/k_server_session.h"
 #include "core/hle/kernel/k_synchronization_object.h"
 
@@ -28,8 +29,10 @@ public:
     void Initialize(KPort* parent);
 
     void EnqueueSession(KServerSession* session);
+    void EnqueueSession(KLightServerSession* session);
 
     KServerSession* AcceptSession();
+    KLightServerSession* AcceptLightSession();
 
     const KPort* GetParent() const {
         return m_parent;
@@ -43,10 +46,12 @@ public:
 
 private:
     using SessionList = Common::IntrusiveListBaseTraits<KServerSession>::ListType;
+    using LightSessionList = Common::IntrusiveListBaseTraits<KLightServerSession>::ListType;
 
     void CleanupSessions();
 
     SessionList m_session_list{};
+    LightSessionList m_light_session_list{};
     KPort* m_parent{};
 };
 

src/core/hle/kernel/k_server_session.cpp

@@ -453,6 +453,11 @@ Result KServerSession::ReceiveRequest(std::shared_ptr<Service::HLERequestContext
     size_t client_buffer_size = request->GetSize();
     // bool recv_list_broken = false;
 
+    if (!client_message) {
+        client_message = GetInteger(client_thread->GetTlsAddress());
+        client_buffer_size = MessageBufferSize;
+    }
+
     // Receive the message.
     Core::Memory::Memory& memory{client_thread->GetOwnerProcess()->GetMemory()};
     if (out_context != nullptr) {

src/core/hle/kernel/k_session.h

@@ -46,6 +46,10 @@ public:
         return this->GetState() != State::Normal;
     }
 
+    Result OnRequest(KSessionRequest* request) {
+        R_RETURN(m_server.OnRequest(request));
+    }
+
     KClientSession& GetClientSession() {
         return m_client;
     }

src/core/hle/kernel/k_thread.h

@@ -385,6 +385,13 @@ public:
         m_cancellable = false;
     }
 
+    u32* GetLightSessionData() const {
+        return m_light_ipc_data;
+    }
+    void SetLightSessionData(u32* data) {
+        m_light_ipc_data = data;
+    }
+
     bool IsTerminationRequested() const {
         return m_termination_requested || GetRawState() == ThreadState::Terminated;
     }

src/core/hle/kernel/kernel.cpp

@@ -1340,6 +1340,7 @@ struct KernelCore::SlabHeapContainer {
     KSlabHeap<KProcess> process;
     KSlabHeap<KResourceLimit> resource_limit;
     KSlabHeap<KSession> session;
+    KSlabHeap<KLightSession> light_session;
     KSlabHeap<KSharedMemory> shared_memory;
     KSlabHeap<KSharedMemoryInfo> shared_memory_info;
     KSlabHeap<KThread> thread;
@@ -1370,6 +1371,8 @@ KSlabHeap<T>& KernelCore::SlabHeap() {
         return slab_heap_container->resource_limit;
     } else if constexpr (std::is_same_v<T, KSession>) {
         return slab_heap_container->session;
+    } else if constexpr (std::is_same_v<T, KLightSession>) {
+        return slab_heap_container->light_session;
     } else if constexpr (std::is_same_v<T, KSharedMemory>) {
         return slab_heap_container->shared_memory;
     } else if constexpr (std::is_same_v<T, KSharedMemoryInfo>) {
@@ -1407,6 +1410,7 @@ template KSlabHeap<KPort>& KernelCore::SlabHeap();
 template KSlabHeap<KProcess>& KernelCore::SlabHeap();
 template KSlabHeap<KResourceLimit>& KernelCore::SlabHeap();
 template KSlabHeap<KSession>& KernelCore::SlabHeap();
+template KSlabHeap<KLightSession>& KernelCore::SlabHeap();
 template KSlabHeap<KSharedMemory>& KernelCore::SlabHeap();
 template KSlabHeap<KSharedMemoryInfo>& KernelCore::SlabHeap();
 template KSlabHeap<KThread>& KernelCore::SlabHeap();

src/core/hle/kernel/svc/svc_ipc.cpp

@@ -7,71 +7,39 @@
 #include "core/hle/kernel/k_client_session.h"
 #include "core/hle/kernel/k_hardware_timer.h"
 #include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_scoped_resource_reservation.h"
 #include "core/hle/kernel/k_server_session.h"
+#include "core/hle/kernel/k_session.h"
 #include "core/hle/kernel/svc.h"
 #include "core/hle/kernel/svc_results.h"
 
 namespace Kernel::Svc {
 
-/// Makes a blocking IPC call to a service.
+namespace {
-Result SendSyncRequest(Core::System& system, Handle handle) {
+
-    // Get the client session from its handle.
+Result SendSyncRequestImpl(KernelCore& kernel, uintptr_t message, size_t buffer_size,
+                           Handle session_handle) {
+    // Get the client session.
     KScopedAutoObject session =
-        GetCurrentProcess(system.Kernel()).GetHandleTable().GetObject<KClientSession>(handle);
+        GetCurrentProcess(kernel).GetHandleTable().GetObject<KClientSession>(session_handle);
     R_UNLESS(session.IsNotNull(), ResultInvalidHandle);
 
-    LOG_TRACE(Kernel_SVC, "called handle=0x{:08X}", handle);
+    // Get the parent, and persist a reference to it until we're done.
+    KScopedAutoObject parent = session->GetParent();
+    ASSERT(parent.IsNotNull());
 
-    R_RETURN(session->SendSyncRequest());
+    // Send the request.
+    R_RETURN(session->SendSyncRequest(message, buffer_size));
 }
 
-Result SendSyncRequestWithUserBuffer(Core::System& system, uint64_t message_buffer,
+Result ReplyAndReceiveImpl(KernelCore& kernel, int32_t* out_index, uintptr_t message,
-                                     uint64_t message_buffer_size, Handle session_handle) {
+                           size_t buffer_size, KPhysicalAddress message_paddr,
-    UNIMPLEMENTED();
+                           KSynchronizationObject** objs, int32_t num_objects, Handle reply_target,
-    R_THROW(ResultNotImplemented);
+                           int64_t timeout_ns) {
-}
-
-Result SendAsyncRequestWithUserBuffer(Core::System& system, Handle* out_event_handle,
-                                      uint64_t message_buffer, uint64_t message_buffer_size,
-                                      Handle session_handle) {
-    UNIMPLEMENTED();
-    R_THROW(ResultNotImplemented);
-}
-
-Result ReplyAndReceive(Core::System& system, s32* out_index, uint64_t handles_addr, s32 num_handles,
-                       Handle reply_target, s64 timeout_ns) {
-    // Ensure number of handles is valid.
-    R_UNLESS(0 <= num_handles && num_handles <= ArgumentHandleCountMax, ResultOutOfRange);
-
-    // Get the synchronization context.
-    auto& kernel = system.Kernel();
-    auto& handle_table = GetCurrentProcess(kernel).GetHandleTable();
-    auto objs = GetCurrentThread(kernel).GetSynchronizationObjectBuffer();
-    auto handles = GetCurrentThread(kernel).GetHandleBuffer();
-
-    // Copy user handles.
-    if (num_handles > 0) {
-        // Get the handles.
-        R_UNLESS(GetCurrentMemory(kernel).ReadBlock(handles_addr, handles.data(),
-                                                    sizeof(Handle) * num_handles),
-                 ResultInvalidPointer);
-
-        // Convert the handles to objects.
-        R_UNLESS(handle_table.GetMultipleObjects<KSynchronizationObject>(
-                     objs.data(), handles.data(), num_handles),
-                 ResultInvalidHandle);
-    }
-
-    // Ensure handles are closed when we're done.
-    SCOPE_EXIT({
-        for (auto i = 0; i < num_handles; ++i) {
-            objs[i]->Close();
-        }
-    });
-
     // Reply to the target, if one is specified.
     if (reply_target != InvalidHandle) {
-        KScopedAutoObject session = handle_table.GetObject<KServerSession>(reply_target);
+        KScopedAutoObject session =
+            GetCurrentProcess(kernel).GetHandleTable().GetObject<KServerSession>(reply_target);
         R_UNLESS(session.IsNotNull(), ResultInvalidHandle);
 
         // If we fail to reply, we want to set the output index to -1.
@@ -81,8 +49,11 @@ Result ReplyAndReceive(Core::System& system, s32* out_index, uint64_t handles_ad
 
         // Send the reply.
         R_TRY(session->SendReply());
+        // R_TRY(session->SendReply(message, buffer_size, message_paddr));
     }
 
+    // Receive a message.
+    {
         // Convert the timeout from nanoseconds to ticks.
         // NOTE: Nintendo does not use this conversion logic in WaitSynchronization...
         s64 timeout;
@@ -104,18 +75,19 @@ Result ReplyAndReceive(Core::System& system, s32* out_index, uint64_t handles_ad
         while (true) {
             // Wait for an object.
             s32 index;
-        Result result = KSynchronizationObject::Wait(kernel, std::addressof(index), objs.data(),
+            Result result = KSynchronizationObject::Wait(kernel, std::addressof(index), objs,
-                                                     num_handles, timeout);
+                                                         num_objects, timeout);
-        if (result == ResultTimedOut) {
+            if (ResultTimedOut == result) {
-            R_RETURN(result);
+                R_THROW(result);
             }
 
             // Receive the request.
             if (R_SUCCEEDED(result)) {
                 KServerSession* session = objs[index]->DynamicCast<KServerSession*>();
                 if (session != nullptr) {
+                    // result = session->ReceiveRequest(message, buffer_size, message_paddr);
                     result = session->ReceiveRequest();
-                if (result == ResultNotFound) {
+                    if (ResultNotFound == result) {
                         continue;
                     }
                 }
@@ -125,13 +97,175 @@ Result ReplyAndReceive(Core::System& system, s32* out_index, uint64_t handles_ad
             R_RETURN(result);
         }
     }
+}
 
-Result ReplyAndReceiveWithUserBuffer(Core::System& system, int32_t* out_index,
+Result ReplyAndReceiveImpl(KernelCore& kernel, int32_t* out_index, uintptr_t message,
-                                     uint64_t message_buffer, uint64_t message_buffer_size,
+                           size_t buffer_size, KPhysicalAddress message_paddr,
-                                     uint64_t handles, int32_t num_handles, Handle reply_target,
+                           KProcessAddress user_handles, int32_t num_handles, Handle reply_target,
                            int64_t timeout_ns) {
-    UNIMPLEMENTED();
+    // Ensure number of handles is valid.
-    R_THROW(ResultNotImplemented);
+    R_UNLESS(0 <= num_handles && num_handles <= Svc::ArgumentHandleCountMax, ResultOutOfRange);
+
+    // Get the synchronization context.
+    auto& process = GetCurrentProcess(kernel);
+    auto& thread = GetCurrentThread(kernel);
+    auto& handle_table = process.GetHandleTable();
+    KSynchronizationObject** objs = thread.GetSynchronizationObjectBuffer().data();
+    Handle* handles = thread.GetHandleBuffer().data();
+
+    // Copy user handles.
+    if (num_handles > 0) {
+        // Ensure that we can try to get the handles.
+        R_UNLESS(process.GetPageTable().Contains(user_handles, num_handles * sizeof(Handle)),
+                 ResultInvalidPointer);
+
+        // Get the handles
+        R_UNLESS(
+            GetCurrentMemory(kernel).ReadBlock(user_handles, handles, sizeof(Handle) * num_handles),
+            ResultInvalidPointer);
+
+        // Convert the handles to objects.
+        R_UNLESS(
+            handle_table.GetMultipleObjects<KSynchronizationObject>(objs, handles, num_handles),
+            ResultInvalidHandle);
+    }
+
+    // Ensure handles are closed when we're done.
+    SCOPE_EXIT({
+        for (auto i = 0; i < num_handles; ++i) {
+            objs[i]->Close();
+        }
+    });
+
+    R_RETURN(ReplyAndReceiveImpl(kernel, out_index, message, buffer_size, message_paddr, objs,
+                                 num_handles, reply_target, timeout_ns));
+}
+
+} // namespace
+
+/// Makes a blocking IPC call to a service.
+Result SendSyncRequest(Core::System& system, Handle session_handle) {
+    R_RETURN(SendSyncRequestImpl(system.Kernel(), 0, 0, session_handle));
+}
+
+Result SendSyncRequestWithUserBuffer(Core::System& system, uint64_t message, uint64_t buffer_size,
+                                     Handle session_handle) {
+    auto& kernel = system.Kernel();
+
+    // Validate that the message buffer is page aligned and does not overflow.
+    R_UNLESS(Common::IsAligned(message, PageSize), ResultInvalidAddress);
+    R_UNLESS(buffer_size > 0, ResultInvalidSize);
+    R_UNLESS(Common::IsAligned(buffer_size, PageSize), ResultInvalidSize);
+    R_UNLESS(message < message + buffer_size, ResultInvalidCurrentMemory);
+
+    // Get the process page table.
+    auto& page_table = GetCurrentProcess(kernel).GetPageTable();
+
+    // Lock the message buffer.
+    R_TRY(page_table.LockForIpcUserBuffer(nullptr, message, buffer_size));
+
+    {
+        // If we fail to send the message, unlock the message buffer.
+        ON_RESULT_FAILURE {
+            page_table.UnlockForIpcUserBuffer(message, buffer_size);
+        };
+
+        // Send the request.
+        ASSERT(message != 0);
+        R_TRY(SendSyncRequestImpl(kernel, message, buffer_size, session_handle));
+    }
+
+    // We successfully processed, so try to unlock the message buffer.
+    R_RETURN(page_table.UnlockForIpcUserBuffer(message, buffer_size));
+}
+
+Result SendAsyncRequestWithUserBuffer(Core::System& system, Handle* out_event_handle,
+                                      uint64_t message, uint64_t buffer_size,
+                                      Handle session_handle) {
+    // Get the process and handle table.
+    auto& process = GetCurrentProcess(system.Kernel());
+    auto& handle_table = process.GetHandleTable();
+
+    // Reserve a new event from the process resource limit.
+    KScopedResourceReservation event_reservation(std::addressof(process),
+                                                 Svc::LimitableResource::EventCountMax);
+    R_UNLESS(event_reservation.Succeeded(), ResultLimitReached);
+
+    // Get the client session.
+    KScopedAutoObject session = process.GetHandleTable().GetObject<KClientSession>(session_handle);
+    R_UNLESS(session.IsNotNull(), ResultInvalidHandle);
+
+    // Get the parent, and persist a reference to it until we're done.
+    KScopedAutoObject parent = session->GetParent();
+    ASSERT(parent.IsNotNull());
+
+    // Create a new event.
+    KEvent* event = KEvent::Create(system.Kernel());
+    R_UNLESS(event != nullptr, ResultOutOfResource);
+
+    // Initialize the event.
+    event->Initialize(std::addressof(process));
+
+    // Commit our reservation.
+    event_reservation.Commit();
+
+    // At end of scope, kill the standing references to the sub events.
+    SCOPE_EXIT({
+        event->GetReadableEvent().Close();
+        event->Close();
+    });
+
+    // Register the event.
+    KEvent::Register(system.Kernel(), event);
+
+    // Add the readable event to the handle table.
+    R_TRY(handle_table.Add(out_event_handle, std::addressof(event->GetReadableEvent())));
+
+    // Ensure that if we fail to send the request, we close the readable handle.
+    ON_RESULT_FAILURE {
+        handle_table.Remove(*out_event_handle);
+    };
+
+    // Send the async request.
+    R_RETURN(session->SendAsyncRequest(event, message, buffer_size));
+}
+
+Result ReplyAndReceive(Core::System& system, s32* out_index, uint64_t handles, s32 num_handles,
+                       Handle reply_target, s64 timeout_ns) {
+    R_RETURN(ReplyAndReceiveImpl(system.Kernel(), out_index, 0, 0, 0, handles, num_handles,
+                                 reply_target, timeout_ns));
+}
+
+Result ReplyAndReceiveWithUserBuffer(Core::System& system, int32_t* out_index, uint64_t message,
+                                     uint64_t buffer_size, uint64_t handles, int32_t num_handles,
+                                     Handle reply_target, int64_t timeout_ns) {
+    // Validate that the message buffer is page aligned and does not overflow.
+    R_UNLESS(Common::IsAligned(message, PageSize), ResultInvalidAddress);
+    R_UNLESS(buffer_size > 0, ResultInvalidSize);
+    R_UNLESS(Common::IsAligned(buffer_size, PageSize), ResultInvalidSize);
+    R_UNLESS(message < message + buffer_size, ResultInvalidCurrentMemory);
+
+    // Get the process page table.
+    auto& page_table = GetCurrentProcess(system.Kernel()).GetPageTable();
+
+    // Lock the message buffer, getting its physical address.
+    KPhysicalAddress message_paddr;
+    R_TRY(page_table.LockForIpcUserBuffer(std::addressof(message_paddr), message, buffer_size));
+
+    {
+        // If we fail to send the message, unlock the message buffer.
+        ON_RESULT_FAILURE {
+            page_table.UnlockForIpcUserBuffer(message, buffer_size);
+        };
+
+        // Reply/Receive the request.
+        ASSERT(message != 0);
+        R_TRY(ReplyAndReceiveImpl(system.Kernel(), out_index, message, buffer_size, message_paddr,
+                                  handles, num_handles, reply_target, timeout_ns));
+    }
+
+    // We successfully processed, so try to unlock the message buffer.
+    R_RETURN(page_table.UnlockForIpcUserBuffer(message, buffer_size));
 }
 
 Result SendSyncRequest64(Core::System& system, Handle session_handle) {

src/core/hle/kernel/svc/svc_light_ipc.cpp

@@ -1,21 +1,40 @@
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "core/arm/arm_interface.h"
 #include "core/core.h"
+#include "core/hle/kernel/k_light_client_session.h"
+#include "core/hle/kernel/k_light_server_session.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_thread.h"
 #include "core/hle/kernel/svc.h"
 #include "core/hle/kernel/svc_results.h"
 
 namespace Kernel::Svc {
 
 Result SendSyncRequestLight(Core::System& system, Handle session_handle, u32* args) {
-    UNIMPLEMENTED();
+    // Get the light client session from its handle.
-    R_THROW(ResultNotImplemented);
+    KScopedAutoObject session = GetCurrentProcess(system.Kernel())
+                                    .GetHandleTable()
+                                    .GetObject<KLightClientSession>(session_handle);
+    R_UNLESS(session.IsNotNull(), ResultInvalidHandle);
+
+    // Send the request.
+    R_TRY(session->SendSyncRequest(args));
+
+    R_SUCCEED();
 }
 
 Result ReplyAndReceiveLight(Core::System& system, Handle session_handle, u32* args) {
-    UNIMPLEMENTED();
+    // Get the light server session from its handle.
-    R_THROW(ResultNotImplemented);
+    KScopedAutoObject session = GetCurrentProcess(system.Kernel())
+                                    .GetHandleTable()
+                                    .GetObject<KLightServerSession>(session_handle);
+    R_UNLESS(session.IsNotNull(), ResultInvalidHandle);
+
+    // Handle the request.
+    R_TRY(session->ReplyAndReceive(args));
+
+    R_SUCCEED();
 }
 
 Result SendSyncRequestLight64(Core::System& system, Handle session_handle, u32* args) {

src/core/hle/kernel/svc/svc_port.cpp

@@ -5,6 +5,7 @@
 #include "core/core.h"
 #include "core/hle/kernel/k_client_port.h"
 #include "core/hle/kernel/k_client_session.h"
+#include "core/hle/kernel/k_light_client_session.h"
 #include "core/hle/kernel/k_object_name.h"
 #include "core/hle/kernel/k_port.h"
 #include "core/hle/kernel/k_process.h"
@@ -51,13 +52,73 @@ Result ConnectToNamedPort(Core::System& system, Handle* out, u64 user_name) {
 
 Result CreatePort(Core::System& system, Handle* out_server, Handle* out_client,
                   int32_t max_sessions, bool is_light, uint64_t name) {
-    UNIMPLEMENTED();
+    auto& kernel = system.Kernel();
-    R_THROW(ResultNotImplemented);
+
+    // Ensure max sessions is valid.
+    R_UNLESS(max_sessions > 0, ResultOutOfRange);
+
+    // Get the current handle table.
+    auto& handle_table = GetCurrentProcess(kernel).GetHandleTable();
+
+    // Create a new port.
+    KPort* port = KPort::Create(kernel);
+    R_UNLESS(port != nullptr, ResultOutOfResource);
+
+    // Initialize the port.
+    port->Initialize(max_sessions, is_light, name);
+
+    // Ensure that we clean up the port (and its only references are handle table) on function end.
+    SCOPE_EXIT({
+        port->GetServerPort().Close();
+        port->GetClientPort().Close();
+    });
+
+    // Register the port.
+    KPort::Register(kernel, port);
+
+    // Add the client to the handle table.
+    R_TRY(handle_table.Add(out_client, std::addressof(port->GetClientPort())));
+
+    // Ensure that we maintain a clean handle state on exit.
+    ON_RESULT_FAILURE {
+        handle_table.Remove(*out_client);
+    };
+
+    // Add the server to the handle table.
+    R_RETURN(handle_table.Add(out_server, std::addressof(port->GetServerPort())));
 }
 
-Result ConnectToPort(Core::System& system, Handle* out_handle, Handle port) {
+Result ConnectToPort(Core::System& system, Handle* out, Handle port) {
-    UNIMPLEMENTED();
+    // Get the current handle table.
-    R_THROW(ResultNotImplemented);
+    auto& handle_table = GetCurrentProcess(system.Kernel()).GetHandleTable();
+
+    // Get the client port.
+    KScopedAutoObject client_port = handle_table.GetObject<KClientPort>(port);
+    R_UNLESS(client_port.IsNotNull(), ResultInvalidHandle);
+
+    // Reserve a handle for the port.
+    // NOTE: Nintendo really does write directly to the output handle here.
+    R_TRY(handle_table.Reserve(out));
+    ON_RESULT_FAILURE {
+        handle_table.Unreserve(*out);
+    };
+
+    // Create the session.
+    KAutoObject* session;
+    if (client_port->IsLight()) {
+        R_TRY(client_port->CreateLightSession(
+            reinterpret_cast<KLightClientSession**>(std::addressof(session))));
+    } else {
+        R_TRY(client_port->CreateSession(
+            reinterpret_cast<KClientSession**>(std::addressof(session))));
+    }
+
+    // Register the session.
+    handle_table.Register(*out, session);
+    session->Close();
+
+    // We succeeded.
+    R_SUCCEED();
 }
 
 Result ManageNamedPort(Core::System& system, Handle* out_server_handle, uint64_t user_name,

src/core/hle/kernel/svc/svc_session.cpp

@@ -3,8 +3,10 @@
 
 #include "common/scope_exit.h"
 #include "core/core.h"
+#include "core/hle/kernel/k_light_session.h"
 #include "core/hle/kernel/k_process.h"
 #include "core/hle/kernel/k_scoped_resource_reservation.h"
+#include "core/hle/kernel/k_server_port.h"
 #include "core/hle/kernel/k_session.h"
 #include "core/hle/kernel/svc.h"
 
@@ -20,7 +22,7 @@ Result CreateSession(Core::System& system, Handle* out_server, Handle* out_clien
     T* session;
 
     // Reserve a new session from the process resource limit.
-    // FIXME: LimitableResource_SessionCountMax
+    // TODO: Dynamic resource limits
     KScopedResourceReservation session_reservation(std::addressof(process),
                                                    LimitableResource::SessionCountMax);
     if (session_reservation.Succeeded()) {
@@ -92,16 +94,42 @@ Result CreateSession(Core::System& system, Handle* out_server, Handle* out_clien
 Result CreateSession(Core::System& system, Handle* out_server, Handle* out_client, bool is_light,
                      u64 name) {
     if (is_light) {
-        // return CreateSession<KLightSession>(system, out_server, out_client, name);
+        R_RETURN(CreateSession<KLightSession>(system, out_server, out_client, name));
-        R_THROW(ResultNotImplemented);
     } else {
         R_RETURN(CreateSession<KSession>(system, out_server, out_client, name));
     }
 }
 
-Result AcceptSession(Core::System& system, Handle* out_handle, Handle port_handle) {
+Result AcceptSession(Core::System& system, Handle* out, Handle port_handle) {
-    UNIMPLEMENTED();
+    // Get the current handle table.
-    R_THROW(ResultNotImplemented);
+    auto& handle_table = GetCurrentProcess(system.Kernel()).GetHandleTable();
+
+    // Get the server port.
+    KScopedAutoObject port = handle_table.GetObject<KServerPort>(port_handle);
+    R_UNLESS(port.IsNotNull(), ResultInvalidHandle);
+
+    // Reserve an entry for the new session.
+    R_TRY(handle_table.Reserve(out));
+    ON_RESULT_FAILURE {
+        handle_table.Unreserve(*out);
+    };
+
+    // Accept the session.
+    KAutoObject* session;
+    if (port->IsLight()) {
+        session = port->AcceptLightSession();
+    } else {
+        session = port->AcceptSession();
+    }
+
+    // Ensure we accepted successfully.
+    R_UNLESS(session != nullptr, ResultNotFound);
+
+    // Register the session.
+    handle_table.Register(*out, session);
+    session->Close();
+
+    R_SUCCEED();
 }
 
 Result CreateSession64(Core::System& system, Handle* out_server_session_handle,

src/core/hle/service/hid/controllers/applet_resource.cpp

@@ -0,0 +1,199 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "core/core.h"
+#include "core/hle/kernel/k_shared_memory.h"
+#include "core/hle/service/hid/controllers/applet_resource.h"
+#include "core/hle/service/hid/errors.h"
+
+namespace Service::HID {
+
+AppletResource::AppletResource(Core::System& system_) : system{system_} {}
+
+AppletResource::~AppletResource() = default;
+
+Result AppletResource::CreateAppletResource(u64 aruid) {
+    const u64 index = GetIndexFromAruid(aruid);
+
+    if (index >= AruidIndexMax) {
+        return ResultAruidNotRegistered;
+    }
+
+    if (data[index].flag.is_assigned) {
+        return ResultAruidAlreadyRegistered;
+    }
+
+    // TODO: Here shared memory is created for the process we don't quite emulate this part so
+    // obtain this pointer from system
+    auto& shared_memory = system.Kernel().GetHidSharedMem();
+
+    data[index].shared_memory_handle = &shared_memory;
+    data[index].flag.is_assigned.Assign(true);
+    // TODO: InitializeSixAxisControllerConfig(false);
+    active_aruid = aruid;
+    return ResultSuccess;
+}
+
+Result AppletResource::RegisterAppletResourceUserId(u64 aruid, bool enable_input) {
+    const u64 index = GetIndexFromAruid(aruid);
+
+    if (index < AruidIndexMax) {
+        return ResultAruidAlreadyRegistered;
+    }
+
+    std::size_t data_index = AruidIndexMax;
+    for (std::size_t i = 0; i < AruidIndexMax; i++) {
+        if (!data[i].flag.is_initialized) {
+            data_index = i;
+            break;
+        }
+    }
+
+    if (data_index == AruidIndexMax) {
+        return ResultAruidNoAvailableEntries;
+    }
+
+    AruidData& aruid_data = data[data_index];
+
+    aruid_data.aruid = aruid;
+    aruid_data.flag.is_initialized.Assign(true);
+    if (enable_input) {
+        aruid_data.flag.enable_pad_input.Assign(true);
+        aruid_data.flag.enable_six_axis_sensor.Assign(true);
+        aruid_data.flag.bit_18.Assign(true);
+        aruid_data.flag.enable_touchscreen.Assign(true);
+    }
+
+    data_index = AruidIndexMax;
+    for (std::size_t i = 0; i < AruidIndexMax; i++) {
+        if (registration_list.flag[i] == RegistrationStatus::Initialized) {
+            if (registration_list.aruid[i] != aruid) {
+                continue;
+            }
+            data_index = i;
+            break;
+        }
+        if (registration_list.flag[i] == RegistrationStatus::None) {
+            data_index = i;
+            break;
+        }
+    }
+
+    if (data_index == AruidIndexMax) {
+        return ResultSuccess;
+    }
+
+    registration_list.flag[data_index] = RegistrationStatus::Initialized;
+    registration_list.aruid[data_index] = aruid;
+
+    return ResultSuccess;
+}
+
+void AppletResource::UnregisterAppletResourceUserId(u64 aruid) {
+    u64 index = GetIndexFromAruid(aruid);
+
+    if (index < AruidIndexMax) {
+        if (data[index].flag.is_assigned) {
+            data[index].shared_memory_handle = nullptr;
+            data[index].flag.is_assigned.Assign(false);
+        }
+    }
+
+    index = GetIndexFromAruid(aruid);
+    if (index < AruidIndexMax) {
+        DestroySevenSixAxisTransferMemory();
+        data[index].flag.raw = 0;
+        data[index].aruid = 0;
+
+        index = GetIndexFromAruid(aruid);
+        if (index < AruidIndexMax) {
+            registration_list.flag[index] = RegistrationStatus::PendingDelete;
+        }
+    }
+}
+
+u64 AppletResource::GetActiveAruid() {
+    return active_aruid;
+}
+
+Result AppletResource::GetSharedMemoryHandle(Kernel::KSharedMemory** out_handle, u64 aruid) {
+    u64 index = GetIndexFromAruid(aruid);
+    if (index >= AruidIndexMax) {
+        return ResultAruidNotRegistered;
+    }
+
+    *out_handle = data[index].shared_memory_handle;
+    return ResultSuccess;
+}
+
+u64 AppletResource::GetIndexFromAruid(u64 aruid) {
+    for (std::size_t i = 0; i < AruidIndexMax; i++) {
+        if (registration_list.flag[i] == RegistrationStatus::Initialized &&
+            registration_list.aruid[i] == aruid) {
+            return i;
+        }
+    }
+    return AruidIndexMax;
+}
+
+Result AppletResource::DestroySevenSixAxisTransferMemory() {
+    // TODO
+    return ResultSuccess;
+}
+
+void AppletResource::EnableInput(u64 aruid, bool is_enabled) {
+    const u64 index = GetIndexFromAruid(aruid);
+    if (index >= AruidIndexMax) {
+        return;
+    }
+
+    data[index].flag.enable_pad_input.Assign(is_enabled);
+    data[index].flag.enable_touchscreen.Assign(is_enabled);
+}
+
+void AppletResource::EnableSixAxisSensor(u64 aruid, bool is_enabled) {
+    const u64 index = GetIndexFromAruid(aruid);
+    if (index >= AruidIndexMax) {
+        return;
+    }
+
+    data[index].flag.enable_six_axis_sensor.Assign(is_enabled);
+}
+
+void AppletResource::EnablePadInput(u64 aruid, bool is_enabled) {
+    const u64 index = GetIndexFromAruid(aruid);
+    if (index >= AruidIndexMax) {
+        return;
+    }
+
+    data[index].flag.enable_pad_input.Assign(is_enabled);
+}
+
+void AppletResource::EnableTouchScreen(u64 aruid, bool is_enabled) {
+    const u64 index = GetIndexFromAruid(aruid);
+    if (index >= AruidIndexMax) {
+        return;
+    }
+
+    data[index].flag.enable_touchscreen.Assign(is_enabled);
+}
+
+void AppletResource::SetIsPalmaConnectable(u64 aruid, bool is_connectable) {
+    const u64 index = GetIndexFromAruid(aruid);
+    if (index >= AruidIndexMax) {
+        return;
+    }
+
+    data[index].flag.is_palma_connectable.Assign(is_connectable);
+}
+
+void AppletResource::EnablePalmaBoostMode(u64 aruid, bool is_enabled) {
+    const u64 index = GetIndexFromAruid(aruid);
+    if (index >= AruidIndexMax) {
+        return;
+    }
+
+    data[index].flag.enable_palma_boost_mode.Assign(is_enabled);
+}
+
+} // namespace Service::HID

src/core/hle/service/hid/controllers/applet_resource.h

@@ -0,0 +1,87 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "core/hle/result.h"
+
+namespace Core {
+class System;
+}
+
+namespace Kernel {
+class KSharedMemory;
+}
+
+namespace Service::HID {
+class AppletResource {
+public:
+    explicit AppletResource(Core::System& system_);
+    ~AppletResource();
+
+    Result CreateAppletResource(u64 aruid);
+
+    Result RegisterAppletResourceUserId(u64 aruid, bool enable_input);
+    void UnregisterAppletResourceUserId(u64 aruid);
+
+    u64 GetActiveAruid();
+    Result GetSharedMemoryHandle(Kernel::KSharedMemory** out_handle, u64 aruid);
+
+    u64 GetIndexFromAruid(u64 aruid);
+
+    Result DestroySevenSixAxisTransferMemory();
+
+    void EnableInput(u64 aruid, bool is_enabled);
+    void EnableSixAxisSensor(u64 aruid, bool is_enabled);
+    void EnablePadInput(u64 aruid, bool is_enabled);
+    void EnableTouchScreen(u64 aruid, bool is_enabled);
+    void SetIsPalmaConnectable(u64 aruid, bool is_connectable);
+    void EnablePalmaBoostMode(u64 aruid, bool is_enabled);
+
+private:
+    static constexpr std::size_t AruidIndexMax = 0x20;
+
+    enum RegistrationStatus : u32 {
+        None,
+        Initialized,
+        PendingDelete,
+    };
+
+    struct DataStatusFlag {
+        union {
+            u32 raw{};
+
+            BitField<0, 1, u32> is_initialized;
+            BitField<1, 1, u32> is_assigned;
+            BitField<16, 1, u32> enable_pad_input;
+            BitField<17, 1, u32> enable_six_axis_sensor;
+            BitField<18, 1, u32> bit_18;
+            BitField<19, 1, u32> is_palma_connectable;
+            BitField<20, 1, u32> enable_palma_boost_mode;
+            BitField<21, 1, u32> enable_touchscreen;
+        };
+    };
+
+    struct AruidRegisterList {
+        std::array<RegistrationStatus, AruidIndexMax> flag{};
+        std::array<u64, AruidIndexMax> aruid{};
+    };
+    static_assert(sizeof(AruidRegisterList) == 0x180, "AruidRegisterList is an invalid size");
+
+    struct AruidData {
+        DataStatusFlag flag{};
+        u64 aruid{};
+        Kernel::KSharedMemory* shared_memory_handle{nullptr};
+    };
+
+    u64 active_aruid{};
+    AruidRegisterList registration_list{};
+    std::array<AruidData, AruidIndexMax> data{};
+
+    Core::System& system;
+};
+} // namespace Service::HID

src/core/hle/service/hid/errors.h

@@ -19,6 +19,11 @@ constexpr Result NpadIsSameType{ErrorModule::HID, 602};
 constexpr Result InvalidNpadId{ErrorModule::HID, 709};
 constexpr Result NpadNotConnected{ErrorModule::HID, 710};
 constexpr Result InvalidArraySize{ErrorModule::HID, 715};
+
+constexpr Result ResultAruidNoAvailableEntries{ErrorModule::HID, 1044};
+constexpr Result ResultAruidAlreadyRegistered{ErrorModule::HID, 1046};
+constexpr Result ResultAruidNotRegistered{ErrorModule::HID, 1047};
+
 constexpr Result InvalidPalmaHandle{ErrorModule::HID, 3302};
 
 } // namespace Service::HID

src/core/hle/service/hid/hid.cpp

@@ -1,6 +1,8 @@
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/kernel.h"
 #include "core/hle/service/hid/hid.h"
 #include "core/hle/service/hid/hid_debug_server.h"
 #include "core/hle/service/hid/hid_firmware_settings.h"
@@ -20,6 +22,12 @@ void LoopProcess(Core::System& system) {
     std::shared_ptr<HidFirmwareSettings> firmware_settings =
         std::make_shared<HidFirmwareSettings>();
 
+    // TODO: Remove this hack until this service is emulated properly.
+    const auto process_list = system.Kernel().GetProcessList();
+    if (!process_list.empty()) {
+        resouce_manager->RegisterAppletResourceUserId(process_list[0]->GetId(), true);
+    }
+
     server_manager->RegisterNamedService(
         "hid", std::make_shared<IHidServer>(system, resouce_manager, firmware_settings));
     server_manager->RegisterNamedService(

src/core/hle/service/hid/hid_server.cpp

@@ -224,8 +224,13 @@ void IHidServer::CreateAppletResource(HLERequestContext& ctx) {
 
     LOG_DEBUG(Service_HID, "called, applet_resource_user_id={}", applet_resource_user_id);
 
+    Result result = GetResourceManager()->CreateAppletResource(applet_resource_user_id);
+    if (result.IsSuccess()) {
+        result = GetResourceManager()->GetNpad()->Activate(applet_resource_user_id);
+    }
+
     IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-    rb.Push(ResultSuccess);
+    rb.Push(result);
     rb.PushIpcInterface<IAppletResource>(system, resource_manager);
 }
 

src/core/hle/service/hid/hid_system_server.cpp

@@ -3,6 +3,7 @@
 
 #include "core/hid/hid_core.h"
 #include "core/hle/service/hid/controllers/npad.h"
+#include "core/hle/service/hid/controllers/palma.h"
 #include "core/hle/service/hid/controllers/touchscreen.h"
 #include "core/hle/service/hid/errors.h"
 #include "core/hle/service/hid/hid_system_server.h"
@@ -63,13 +64,13 @@ IHidSystemServer::IHidSystemServer(Core::System& system_, std::shared_ptr<Resour
         {329, nullptr, "DetachAbstractedPadAll"},
         {330, nullptr, "CheckAbstractedPadConnection"},
         {500, nullptr, "SetAppletResourceUserId"},
-        {501, nullptr, "RegisterAppletResourceUserId"},
+        {501, &IHidSystemServer::RegisterAppletResourceUserId, "RegisterAppletResourceUserId"},
-        {502, nullptr, "UnregisterAppletResourceUserId"},
+        {502, &IHidSystemServer::UnregisterAppletResourceUserId, "UnregisterAppletResourceUserId"},
-        {503, nullptr, "EnableAppletToGetInput"},
+        {503, &IHidSystemServer::EnableAppletToGetInput, "EnableAppletToGetInput"},
         {504, nullptr, "SetAruidValidForVibration"},
-        {505, nullptr, "EnableAppletToGetSixAxisSensor"},
+        {505, &IHidSystemServer::EnableAppletToGetSixAxisSensor, "EnableAppletToGetSixAxisSensor"},
-        {506, nullptr, "EnableAppletToGetPadInput"},
+        {506, &IHidSystemServer::EnableAppletToGetPadInput, "EnableAppletToGetPadInput"},
-        {507, nullptr, "EnableAppletToGetTouchScreen"},
+        {507, &IHidSystemServer::EnableAppletToGetTouchScreen, "EnableAppletToGetTouchScreen"},
         {510, nullptr, "SetVibrationMasterVolume"},
         {511, nullptr, "GetVibrationMasterVolume"},
         {512, nullptr, "BeginPermitVibrationSession"},
@@ -420,6 +421,129 @@ void IHidSystemServer::GetIrSensorState(HLERequestContext& ctx) {
     IPC::ResponseBuilder rb{ctx, 2};
     rb.Push(ResultSuccess);
 }
+void IHidSystemServer::RegisterAppletResourceUserId(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    struct Parameters {
+        bool enable_input;
+        INSERT_PADDING_WORDS_NOINIT(1);
+        u64 applet_resource_user_id;
+    };
+    static_assert(sizeof(Parameters) == 0x10, "Parameters has incorrect size.");
+
+    const auto parameters{rp.PopRaw<Parameters>()};
+
+    LOG_INFO(Service_HID, "called, enable_input={}, applet_resource_user_id={}",
+             parameters.enable_input, parameters.applet_resource_user_id);
+
+    Result result = GetResourceManager()->RegisterAppletResourceUserId(
+        parameters.applet_resource_user_id, parameters.enable_input);
+
+    if (result.IsSuccess()) {
+        // result = GetResourceManager()->GetNpad()->RegisterAppletResourceUserId(
+        //     parameters.applet_resource_user_id);
+    }
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IHidSystemServer::UnregisterAppletResourceUserId(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    u64 applet_resource_user_id{rp.Pop<u64>()};
+
+    LOG_INFO(Service_HID, "called, applet_resource_user_id={}", applet_resource_user_id);
+
+    GetResourceManager()->UnregisterAppletResourceUserId(applet_resource_user_id);
+    // GetResourceManager()->GetNpad()->UnregisterAppletResourceUserId(applet_resource_user_id);
+    // GetResourceManager()->GetPalma()->UnregisterAppletResourceUserId(applet_resource_user_id);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IHidSystemServer::EnableAppletToGetInput(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    struct Parameters {
+        bool is_enabled;
+        INSERT_PADDING_WORDS_NOINIT(1);
+        u64 applet_resource_user_id;
+    };
+    static_assert(sizeof(Parameters) == 0x10, "Parameters has incorrect size.");
+
+    const auto parameters{rp.PopRaw<Parameters>()};
+
+    LOG_INFO(Service_HID, "called, is_enabled={}, applet_resource_user_id={}",
+             parameters.is_enabled, parameters.applet_resource_user_id);
+
+    GetResourceManager()->EnableInput(parameters.applet_resource_user_id, parameters.is_enabled);
+    // GetResourceManager()->GetNpad()->EnableInput(parameters.applet_resource_user_id);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IHidSystemServer::EnableAppletToGetSixAxisSensor(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    struct Parameters {
+        bool is_enabled;
+        INSERT_PADDING_WORDS_NOINIT(1);
+        u64 applet_resource_user_id;
+    };
+    static_assert(sizeof(Parameters) == 0x10, "Parameters has incorrect size.");
+
+    const auto parameters{rp.PopRaw<Parameters>()};
+
+    LOG_INFO(Service_HID, "called, is_enabled={}, applet_resource_user_id={}",
+             parameters.is_enabled, parameters.applet_resource_user_id);
+
+    GetResourceManager()->EnableTouchScreen(parameters.applet_resource_user_id,
+                                            parameters.is_enabled);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IHidSystemServer::EnableAppletToGetPadInput(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    struct Parameters {
+        bool is_enabled;
+        INSERT_PADDING_WORDS_NOINIT(1);
+        u64 applet_resource_user_id;
+    };
+    static_assert(sizeof(Parameters) == 0x10, "Parameters has incorrect size.");
+
+    const auto parameters{rp.PopRaw<Parameters>()};
+
+    LOG_INFO(Service_HID, "called, is_enabled={}, applet_resource_user_id={}",
+             parameters.is_enabled, parameters.applet_resource_user_id);
+
+    GetResourceManager()->EnablePadInput(parameters.applet_resource_user_id, parameters.is_enabled);
+    // GetResourceManager()->GetNpad()->EnableInput(parameters.applet_resource_user_id);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IHidSystemServer::EnableAppletToGetTouchScreen(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    struct Parameters {
+        bool is_enabled;
+        INSERT_PADDING_WORDS_NOINIT(1);
+        u64 applet_resource_user_id;
+    };
+    static_assert(sizeof(Parameters) == 0x10, "Parameters has incorrect size.");
+
+    const auto parameters{rp.PopRaw<Parameters>()};
+
+    LOG_INFO(Service_HID, "called, is_enabled={}, applet_resource_user_id={}",
+             parameters.is_enabled, parameters.applet_resource_user_id);
+
+    GetResourceManager()->EnableTouchScreen(parameters.applet_resource_user_id,
+                                            parameters.is_enabled);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
 
 void IHidSystemServer::AcquireConnectionTriggerTimeoutEvent(HLERequestContext& ctx) {
     LOG_INFO(Service_AM, "(STUBBED) called");

src/core/hle/service/hid/hid_system_server.h

@@ -38,6 +38,12 @@ private:
     void HasLeftRightBattery(HLERequestContext& ctx);
     void GetUniquePadsFromNpad(HLERequestContext& ctx);
     void GetIrSensorState(HLERequestContext& ctx);
+    void RegisterAppletResourceUserId(HLERequestContext& ctx);
+    void UnregisterAppletResourceUserId(HLERequestContext& ctx);
+    void EnableAppletToGetInput(HLERequestContext& ctx);
+    void EnableAppletToGetSixAxisSensor(HLERequestContext& ctx);
+    void EnableAppletToGetPadInput(HLERequestContext& ctx);
+    void EnableAppletToGetTouchScreen(HLERequestContext& ctx);
     void AcquireConnectionTriggerTimeoutEvent(HLERequestContext& ctx);
     void AcquireDeviceRegisteredEventForControllerSupport(HLERequestContext& ctx);
     void GetRegisteredDevices(HLERequestContext& ctx);

src/core/hle/service/hid/resource_manager.cpp

@@ -9,6 +9,7 @@
 #include "core/hle/service/hid/resource_manager.h"
 #include "core/hle/service/ipc_helpers.h"
 
+#include "core/hle/service/hid/controllers/applet_resource.h"
 #include "core/hle/service/hid/controllers/console_six_axis.h"
 #include "core/hle/service/hid/controllers/debug_pad.h"
 #include "core/hle/service/hid/controllers/gesture.h"
@@ -33,7 +34,9 @@ constexpr auto mouse_keyboard_update_ns = std::chrono::nanoseconds{8 * 1000 * 10
 constexpr auto motion_update_ns = std::chrono::nanoseconds{5 * 1000 * 1000};         // (5ms, 200Hz)
 
 ResourceManager::ResourceManager(Core::System& system_)
-    : system{system_}, service_context{system_, "hid"} {}
+    : system{system_}, service_context{system_, "hid"} {
+    applet_resource = std::make_shared<AppletResource>(system);
+}
 
 ResourceManager::~ResourceManager() = default;
 
@@ -77,6 +80,11 @@ void ResourceManager::Initialize() {
     system.HIDCore().ReloadInputDevices();
     is_initialized = true;
 }
+
+std::shared_ptr<AppletResource> ResourceManager::GetAppletResource() const {
+    return applet_resource;
+}
+
 std::shared_ptr<CaptureButton> ResourceManager::GetCaptureButton() const {
     return capture_button;
 }
@@ -137,6 +145,46 @@ std::shared_ptr<UniquePad> ResourceManager::GetUniquePad() const {
     return unique_pad;
 }
 
+Result ResourceManager::CreateAppletResource(u64 aruid) {
+    std::scoped_lock lock{shared_mutex};
+    return applet_resource->CreateAppletResource(aruid);
+}
+
+Result ResourceManager::RegisterAppletResourceUserId(u64 aruid, bool bool_value) {
+    std::scoped_lock lock{shared_mutex};
+    return applet_resource->RegisterAppletResourceUserId(aruid, bool_value);
+}
+
+void ResourceManager::UnregisterAppletResourceUserId(u64 aruid) {
+    std::scoped_lock lock{shared_mutex};
+    applet_resource->UnregisterAppletResourceUserId(aruid);
+}
+
+Result ResourceManager::GetSharedMemoryHandle(Kernel::KSharedMemory** out_handle, u64 aruid) {
+    std::scoped_lock lock{shared_mutex};
+    return applet_resource->GetSharedMemoryHandle(out_handle, aruid);
+}
+
+void ResourceManager::EnableInput(u64 aruid, bool is_enabled) {
+    std::scoped_lock lock{shared_mutex};
+    applet_resource->EnableInput(aruid, is_enabled);
+}
+
+void ResourceManager::EnableSixAxisSensor(u64 aruid, bool is_enabled) {
+    std::scoped_lock lock{shared_mutex};
+    applet_resource->EnableSixAxisSensor(aruid, is_enabled);
+}
+
+void ResourceManager::EnablePadInput(u64 aruid, bool is_enabled) {
+    std::scoped_lock lock{shared_mutex};
+    applet_resource->EnablePadInput(aruid, is_enabled);
+}
+
+void ResourceManager::EnableTouchScreen(u64 aruid, bool is_enabled) {
+    std::scoped_lock lock{shared_mutex};
+    applet_resource->EnableTouchScreen(aruid, is_enabled);
+}
+
 void ResourceManager::UpdateControllers(std::uintptr_t user_data,
                                         std::chrono::nanoseconds ns_late) {
     auto& core_timing = system.CoreTiming();
@@ -172,14 +220,12 @@ void ResourceManager::UpdateMotion(std::uintptr_t user_data, std::chrono::nanose
 }
 
 IAppletResource::IAppletResource(Core::System& system_, std::shared_ptr<ResourceManager> resource)
-    : ServiceFramework{system_, "IAppletResource"} {
+    : ServiceFramework{system_, "IAppletResource"}, resource_manager{resource} {
     static const FunctionInfo functions[] = {
         {0, &IAppletResource::GetSharedMemoryHandle, "GetSharedMemoryHandle"},
     };
     RegisterHandlers(functions);
 
-    resource->Initialize();
-
     // Register update callbacks
     npad_update_event = Core::Timing::CreateEvent(
         "HID::UpdatePadCallback",
@@ -233,9 +279,13 @@ IAppletResource::~IAppletResource() {
 void IAppletResource::GetSharedMemoryHandle(HLERequestContext& ctx) {
     LOG_DEBUG(Service_HID, "called");
 
+    Kernel::KSharedMemory* handle;
+    const u64 applet_resource_user_id = resource_manager->GetAppletResource()->GetActiveAruid();
+    const auto result = resource_manager->GetSharedMemoryHandle(&handle, applet_resource_user_id);
+
     IPC::ResponseBuilder rb{ctx, 2, 1};
-    rb.Push(ResultSuccess);
+    rb.Push(result);
-    rb.PushCopyObjects(&system.Kernel().GetHidSharedMem());
+    rb.PushCopyObjects(handle);
 }
 
 } // namespace Service::HID

src/core/hle/service/hid/resource_manager.h

@@ -6,11 +6,20 @@
 #include "core/hle/service/kernel_helpers.h"
 #include "core/hle/service/service.h"
 
+namespace Core {
+class System;
+}
+
 namespace Core::Timing {
 struct EventType;
 }
 
+namespace Kernel {
+class KSharedMemory;
+}
+
 namespace Service::HID {
+class AppletResource;
 class Controller_Stubbed;
 class ConsoleSixAxis;
 class DebugPad;
@@ -38,6 +47,7 @@ public:
 
     void Initialize();
 
+    std::shared_ptr<AppletResource> GetAppletResource() const;
     std::shared_ptr<CaptureButton> GetCaptureButton() const;
     std::shared_ptr<ConsoleSixAxis> GetConsoleSixAxis() const;
     std::shared_ptr<DebugMouse> GetDebugMouse() const;
@@ -54,6 +64,18 @@ public:
     std::shared_ptr<TouchScreen> GetTouchScreen() const;
     std::shared_ptr<UniquePad> GetUniquePad() const;
 
+    Result CreateAppletResource(u64 aruid);
+
+    Result RegisterAppletResourceUserId(u64 aruid, bool bool_value);
+    void UnregisterAppletResourceUserId(u64 aruid);
+
+    Result GetSharedMemoryHandle(Kernel::KSharedMemory** out_handle, u64 aruid);
+
+    void EnableInput(u64 aruid, bool is_enabled);
+    void EnableSixAxisSensor(u64 aruid, bool is_enabled);
+    void EnablePadInput(u64 aruid, bool is_enabled);
+    void EnableTouchScreen(u64 aruid, bool is_enabled);
+
     void UpdateControllers(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
     void UpdateNpad(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
     void UpdateMouseKeyboard(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
@@ -62,6 +84,9 @@ public:
 private:
     bool is_initialized{false};
 
+    mutable std::mutex shared_mutex;
+    std::shared_ptr<AppletResource> applet_resource = nullptr;
+
     std::shared_ptr<CaptureButton> capture_button = nullptr;
     std::shared_ptr<ConsoleSixAxis> console_six_axis = nullptr;
     std::shared_ptr<DebugMouse> debug_mouse = nullptr;
@@ -106,6 +131,8 @@ private:
     std::shared_ptr<Core::Timing::EventType> default_update_event;
     std::shared_ptr<Core::Timing::EventType> mouse_keyboard_update_event;
     std::shared_ptr<Core::Timing::EventType> motion_update_event;
+
+    std::shared_ptr<ResourceManager> resource_manager;
 };
 
 } // namespace Service::HID

src/core/hle/service/nvnflinger/fb_share_buffer_manager.cpp

@@ -171,6 +171,7 @@ void MakeGraphicBuffer(android::BufferQueueProducer& producer, u32 slot, u32 han
     buffer->height = SharedBufferHeight;
     buffer->stride = SharedBufferBlockLinearStride;
     buffer->format = SharedBufferBlockLinearFormat;
+    buffer->external_format = SharedBufferBlockLinearFormat;
     buffer->buffer_id = handle;
     buffer->offset = slot * SharedBufferSlotSize;
     ASSERT(producer.SetPreallocatedBuffer(slot, buffer) == android::Status::NoError);

src/core/hle/service/sm/sm.cpp

@@ -192,8 +192,6 @@ Result SM::GetServiceImpl(Kernel::KClientSession** out_client_session, HLEReques
         return result;
     }
 
-    LOG_DEBUG(Service_SM, "called service={} -> session={}", name, session->GetId());
-
     *out_client_session = session;
     return ResultSuccess;
 }

src/video_core/host1x/ffmpeg/ffmpeg.cpp

@@ -233,7 +233,12 @@ std::unique_ptr<Frame> DecoderContext::ReceiveFrame(bool* out_is_interlaced) {
             return false;
         }
 
-        *out_is_interlaced = frame->interlaced_frame != 0;
+        *out_is_interlaced =
+#if defined(FF_API_INTERLACED_FRAME) || LIBAVUTIL_VERSION_MAJOR >= 59
+            (frame->flags & AV_FRAME_FLAG_INTERLACED) != 0;
+#else
+            frame->interlaced_frame != 0;
+#endif
         return true;
     };
 

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -714,7 +714,8 @@ bool RasterizerOpenGL::AccelerateDisplay(const Tegra::FramebufferConfig& config,
     MICROPROFILE_SCOPE(OpenGL_CacheManagement);
 
     std::scoped_lock lock{texture_cache.mutex};
-    ImageView* const image_view{texture_cache.TryFindFramebufferImageView(framebuffer_addr)};
+    ImageView* const image_view{
+        texture_cache.TryFindFramebufferImageView(config, framebuffer_addr)};
     if (!image_view) {
         return false;
     }
@@ -725,7 +726,6 @@ bool RasterizerOpenGL::AccelerateDisplay(const Tegra::FramebufferConfig& config,
     screen_info.texture.width = image_view->size.width;
     screen_info.texture.height = image_view->size.height;
     screen_info.display_texture = image_view->Handle(Shader::TextureType::Color2D);
-    screen_info.display_srgb = VideoCore::Surface::IsPixelFormatSRGB(image_view->format);
     return true;
 }
 

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -653,11 +653,7 @@ void RendererOpenGL::DrawScreen(const Layout::FramebufferLayout& layout) {
     };
     glNamedBufferSubData(vertex_buffer.handle, 0, sizeof(vertices), std::data(vertices));
 
-    if (screen_info.display_srgb) {
-        glEnable(GL_FRAMEBUFFER_SRGB);
-    } else {
     glDisable(GL_FRAMEBUFFER_SRGB);
-    }
     glViewportIndexedf(0, 0.0f, 0.0f, static_cast<GLfloat>(layout.width),
                        static_cast<GLfloat>(layout.height));
 
@@ -710,8 +706,7 @@ void RendererOpenGL::RenderScreenshot() {
     GLuint renderbuffer;
     glGenRenderbuffers(1, &renderbuffer);
     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
-    glRenderbufferStorage(GL_RENDERBUFFER, screen_info.display_srgb ? GL_SRGB8 : GL_RGB8,
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_SRGB8, layout.width, layout.height);
-                          layout.width, layout.height);
     glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
 
     DrawScreen(layout);

src/video_core/renderer_opengl/renderer_opengl.h

@@ -53,7 +53,6 @@ struct TextureInfo {
 struct ScreenInfo {
     GLuint display_texture{};
     bool was_accelerated = false;
-    bool display_srgb{};
     const Common::Rectangle<float> display_texcoords{0.0f, 0.0f, 1.0f, 1.0f};
     TextureInfo texture;
 };

src/video_core/renderer_vulkan/renderer_vulkan.cpp

@@ -94,7 +94,7 @@ RendererVulkan::RendererVulkan(Core::TelemetrySession& telemetry_session_,
       device(CreateDevice(instance, dld, *surface)), memory_allocator(device), state_tracker(),
       scheduler(device, state_tracker),
       swapchain(*surface, device, scheduler, render_window.GetFramebufferLayout().width,
-                render_window.GetFramebufferLayout().height, false),
+                render_window.GetFramebufferLayout().height),
       present_manager(instance, render_window, device, memory_allocator, scheduler, swapchain,
                       surface),
       blit_screen(cpu_memory, render_window, device, memory_allocator, swapchain, present_manager,
@@ -131,11 +131,10 @@ void RendererVulkan::SwapBuffers(const Tegra::FramebufferConfig* framebuffer) {
     const VAddr framebuffer_addr = framebuffer->address + framebuffer->offset;
     const bool use_accelerated =
         rasterizer.AccelerateDisplay(*framebuffer, framebuffer_addr, framebuffer->stride);
-    const bool is_srgb = use_accelerated && screen_info.is_srgb;
     RenderScreenshot(*framebuffer, use_accelerated);
 
     Frame* frame = present_manager.GetRenderFrame();
-    blit_screen.DrawToSwapchain(frame, *framebuffer, use_accelerated, is_srgb);
+    blit_screen.DrawToSwapchain(frame, *framebuffer, use_accelerated);
     scheduler.Flush(*frame->render_ready);
     present_manager.Present(frame);
 
@@ -205,7 +204,7 @@ void Vulkan::RendererVulkan::RenderScreenshot(const Tegra::FramebufferConfig& fr
         .flags = 0,
         .image = *staging_image,
         .viewType = VK_IMAGE_VIEW_TYPE_2D,
-        .format = screen_info.is_srgb ? VK_FORMAT_B8G8R8A8_SRGB : VK_FORMAT_B8G8R8A8_UNORM,
+        .format = VK_FORMAT_B8G8R8A8_UNORM,
         .components{
             .r = VK_COMPONENT_SWIZZLE_IDENTITY,
             .g = VK_COMPONENT_SWIZZLE_IDENTITY,

src/video_core/renderer_vulkan/vk_blit_screen.cpp

@@ -127,9 +127,9 @@ BlitScreen::BlitScreen(Core::Memory::Memory& cpu_memory_, Core::Frontend::EmuWin
                        Scheduler& scheduler_, const ScreenInfo& screen_info_)
     : cpu_memory{cpu_memory_}, render_window{render_window_}, device{device_},
       memory_allocator{memory_allocator_}, swapchain{swapchain_}, present_manager{present_manager_},
-      scheduler{scheduler_}, image_count{swapchain.GetImageCount()}, screen_info{screen_info_},
+      scheduler{scheduler_}, image_count{swapchain.GetImageCount()}, screen_info{screen_info_} {
-      current_srgb{swapchain.IsSrgb()}, image_view_format{swapchain.GetImageViewFormat()} {
     resource_ticks.resize(image_count);
+    swapchain_view_format = swapchain.GetImageViewFormat();
 
     CreateStaticResources();
     CreateDynamicResources();
@@ -480,28 +480,22 @@ void BlitScreen::Draw(const Tegra::FramebufferConfig& framebuffer,
 }
 
 void BlitScreen::DrawToSwapchain(Frame* frame, const Tegra::FramebufferConfig& framebuffer,
-                                 bool use_accelerated, bool is_srgb) {
+                                 bool use_accelerated) {
-    // Recreate dynamic resources if the the image count or colorspace changed
+    // Recreate dynamic resources if the the image count or input format changed
+    const VkFormat current_framebuffer_format =
+        std::exchange(framebuffer_view_format, GetFormat(framebuffer));
     if (const std::size_t swapchain_images = swapchain.GetImageCount();
-        swapchain_images != image_count || current_srgb != is_srgb) {
+        swapchain_images != image_count || current_framebuffer_format != framebuffer_view_format) {
-        current_srgb = is_srgb;
-#ifdef ANDROID
-        // Android is already ordered the same as Switch.
-        image_view_format = current_srgb ? VK_FORMAT_R8G8B8A8_SRGB : VK_FORMAT_R8G8B8A8_UNORM;
-#else
-        image_view_format = current_srgb ? VK_FORMAT_B8G8R8A8_SRGB : VK_FORMAT_B8G8R8A8_UNORM;
-#endif
         image_count = swapchain_images;
         Recreate();
     }
 
     // Recreate the presentation frame if the dimensions of the window changed
     const Layout::FramebufferLayout layout = render_window.GetFramebufferLayout();
-    if (layout.width != frame->width || layout.height != frame->height ||
+    if (layout.width != frame->width || layout.height != frame->height) {
-        is_srgb != frame->is_srgb) {
         Recreate();
-        present_manager.RecreateFrame(frame, layout.width, layout.height, is_srgb,
+        present_manager.RecreateFrame(frame, layout.width, layout.height, swapchain_view_format,
-                                      image_view_format, *renderpass);
+                                      *renderpass);
     }
 
     const VkExtent2D render_area{frame->width, frame->height};
@@ -629,7 +623,7 @@ void BlitScreen::CreateDescriptorPool() {
 }
 
 void BlitScreen::CreateRenderPass() {
-    renderpass = CreateRenderPassImpl(image_view_format);
+    renderpass = CreateRenderPassImpl(swapchain_view_format);
 }
 
 vk::RenderPass BlitScreen::CreateRenderPassImpl(VkFormat format) {
@@ -1149,7 +1143,7 @@ void BlitScreen::CreateRawImages(const Tegra::FramebufferConfig& framebuffer) {
             .pNext = nullptr,
             .flags = 0,
             .imageType = VK_IMAGE_TYPE_2D,
-            .format = used_on_framebuffer ? VK_FORMAT_R16G16B16A16_SFLOAT : GetFormat(framebuffer),
+            .format = used_on_framebuffer ? VK_FORMAT_R16G16B16A16_SFLOAT : framebuffer_view_format,
             .extent =
                 {
                     .width = (up_scale * framebuffer.width) >> down_shift,
@@ -1174,7 +1168,7 @@ void BlitScreen::CreateRawImages(const Tegra::FramebufferConfig& framebuffer) {
             .flags = 0,
             .image = *image,
             .viewType = VK_IMAGE_VIEW_TYPE_2D,
-            .format = used_on_framebuffer ? VK_FORMAT_R16G16B16A16_SFLOAT : GetFormat(framebuffer),
+            .format = used_on_framebuffer ? VK_FORMAT_R16G16B16A16_SFLOAT : framebuffer_view_format,
             .components =
                 {
                     .r = VK_COMPONENT_SWIZZLE_IDENTITY,

src/video_core/renderer_vulkan/vk_blit_screen.h

@@ -52,7 +52,6 @@ struct ScreenInfo {
     VkImageView image_view{};
     u32 width{};
     u32 height{};
-    bool is_srgb{};
 };
 
 class BlitScreen {
@@ -69,7 +68,7 @@ public:
               const Layout::FramebufferLayout layout, VkExtent2D render_area, bool use_accelerated);
 
     void DrawToSwapchain(Frame* frame, const Tegra::FramebufferConfig& framebuffer,
-                         bool use_accelerated, bool is_srgb);
+                         bool use_accelerated);
 
     [[nodiscard]] vk::Framebuffer CreateFramebuffer(const VkImageView& image_view,
                                                     VkExtent2D extent);
@@ -161,8 +160,8 @@ private:
     u32 raw_width = 0;
     u32 raw_height = 0;
     Service::android::PixelFormat pixel_format{};
-    bool current_srgb;
+    VkFormat framebuffer_view_format;
-    VkFormat image_view_format;
+    VkFormat swapchain_view_format;
 
     std::unique_ptr<FSR> fsr;
     std::unique_ptr<SMAA> smaa;

src/video_core/renderer_vulkan/vk_present_manager.cpp

@@ -172,13 +172,12 @@ void PresentManager::Present(Frame* frame) {
     });
 }
 
-void PresentManager::RecreateFrame(Frame* frame, u32 width, u32 height, bool is_srgb,
+void PresentManager::RecreateFrame(Frame* frame, u32 width, u32 height, VkFormat image_view_format,
-                                   VkFormat image_view_format, VkRenderPass rd) {
+                                   VkRenderPass rd) {
     auto& dld = device.GetLogical();
 
     frame->width = width;
     frame->height = height;
-    frame->is_srgb = is_srgb;
 
     frame->image = memory_allocator.CreateImage({
         .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
@@ -289,7 +288,7 @@ void PresentManager::PresentThread(std::stop_token token) {
 }
 
 void PresentManager::RecreateSwapchain(Frame* frame) {
-    swapchain.Create(*surface, frame->width, frame->height, frame->is_srgb);
+    swapchain.Create(*surface, frame->width, frame->height);
     image_count = swapchain.GetImageCount();
 }
 
@@ -319,12 +318,12 @@ void PresentManager::CopyToSwapchain(Frame* frame) {
 void PresentManager::CopyToSwapchainImpl(Frame* frame) {
     MICROPROFILE_SCOPE(Vulkan_CopyToSwapchain);
 
-    // If the size or colorspace of the incoming frames has changed, recreate the swapchain
+    // If the size of the incoming frames has changed, recreate the swapchain
     // to account for that.
-    const bool srgb_changed = swapchain.NeedsRecreation(frame->is_srgb);
+    const bool is_suboptimal = swapchain.NeedsRecreation();
     const bool size_changed =
         swapchain.GetWidth() != frame->width || swapchain.GetHeight() != frame->height;
-    if (srgb_changed || size_changed) {
+    if (is_suboptimal || size_changed) {
         RecreateSwapchain(frame);
     }
 

src/video_core/renderer_vulkan/vk_present_manager.h

@@ -25,7 +25,6 @@ class Swapchain;
 struct Frame {
     u32 width;
     u32 height;
-    bool is_srgb;
     vk::Image image;
     vk::ImageView image_view;
     vk::Framebuffer framebuffer;
@@ -48,8 +47,8 @@ public:
     void Present(Frame* frame);
 
     /// Recreates the present frame to match the provided parameters
-    void RecreateFrame(Frame* frame, u32 width, u32 height, bool is_srgb,
+    void RecreateFrame(Frame* frame, u32 width, u32 height, VkFormat image_view_format,
-                       VkFormat image_view_format, VkRenderPass rd);
+                       VkRenderPass rd);
 
     /// Waits for the present thread to finish presenting all queued frames.
     void WaitPresent();

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -783,7 +783,8 @@ bool RasterizerVulkan::AccelerateDisplay(const Tegra::FramebufferConfig& config,
         return false;
     }
     std::scoped_lock lock{texture_cache.mutex};
-    ImageView* const image_view = texture_cache.TryFindFramebufferImageView(framebuffer_addr);
+    ImageView* const image_view =
+        texture_cache.TryFindFramebufferImageView(config, framebuffer_addr);
     if (!image_view) {
         return false;
     }
@@ -792,7 +793,6 @@ bool RasterizerVulkan::AccelerateDisplay(const Tegra::FramebufferConfig& config,
     screen_info.image_view = image_view->Handle(Shader::TextureType::Color2D);
     screen_info.width = image_view->size.width;
     screen_info.height = image_view->size.height;
-    screen_info.is_srgb = VideoCore::Surface::IsPixelFormatSRGB(image_view->format);
     return true;
 }
 

src/video_core/renderer_vulkan/vk_swapchain.cpp

@@ -105,14 +105,14 @@ VkCompositeAlphaFlagBitsKHR ChooseAlphaFlags(const VkSurfaceCapabilitiesKHR& cap
 } // Anonymous namespace
 
 Swapchain::Swapchain(VkSurfaceKHR surface_, const Device& device_, Scheduler& scheduler_,
-                     u32 width_, u32 height_, bool srgb)
+                     u32 width_, u32 height_)
     : surface{surface_}, device{device_}, scheduler{scheduler_} {
-    Create(surface_, width_, height_, srgb);
+    Create(surface_, width_, height_);
 }
 
 Swapchain::~Swapchain() = default;
 
-void Swapchain::Create(VkSurfaceKHR surface_, u32 width_, u32 height_, bool srgb) {
+void Swapchain::Create(VkSurfaceKHR surface_, u32 width_, u32 height_) {
     is_outdated = false;
     is_suboptimal = false;
     width = width_;
@@ -127,7 +127,7 @@ void Swapchain::Create(VkSurfaceKHR surface_, u32 width_, u32 height_, bool srgb
 
     Destroy();
 
-    CreateSwapchain(capabilities, srgb);
+    CreateSwapchain(capabilities);
     CreateSemaphores();
 
     resource_ticks.clear();
@@ -196,7 +196,7 @@ void Swapchain::Present(VkSemaphore render_semaphore) {
     }
 }
 
-void Swapchain::CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities, bool srgb) {
+void Swapchain::CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities) {
     const auto physical_device{device.GetPhysical()};
     const auto formats{physical_device.GetSurfaceFormatsKHR(surface)};
     const auto present_modes = physical_device.GetSurfacePresentModesKHR(surface);
@@ -274,15 +274,14 @@ void Swapchain::CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities, bo
     swapchain = device.GetLogical().CreateSwapchainKHR(swapchain_ci);
 
     extent = swapchain_ci.imageExtent;
-    current_srgb = srgb;
 
     images = swapchain.GetImages();
     image_count = static_cast<u32>(images.size());
 #ifdef ANDROID
     // Android is already ordered the same as Switch.
-    image_view_format = srgb ? VK_FORMAT_R8G8B8A8_SRGB : VK_FORMAT_R8G8B8A8_UNORM;
+    image_view_format = VK_FORMAT_R8G8B8A8_UNORM;
 #else
-    image_view_format = srgb ? VK_FORMAT_B8G8R8A8_SRGB : VK_FORMAT_B8G8R8A8_UNORM;
+    image_view_format = VK_FORMAT_B8G8R8A8_UNORM;
 #endif
 }
 

src/video_core/renderer_vulkan/vk_swapchain.h

@@ -20,11 +20,11 @@ class Scheduler;
 class Swapchain {
 public:
     explicit Swapchain(VkSurfaceKHR surface, const Device& device, Scheduler& scheduler, u32 width,
-                       u32 height, bool srgb);
+                       u32 height);
     ~Swapchain();
 
     /// Creates (or recreates) the swapchain with a given size.
-    void Create(VkSurfaceKHR surface, u32 width, u32 height, bool srgb);
+    void Create(VkSurfaceKHR surface, u32 width, u32 height);
 
     /// Acquires the next image in the swapchain, waits as needed.
     bool AcquireNextImage();
@@ -33,13 +33,8 @@ public:
     void Present(VkSemaphore render_semaphore);
 
     /// Returns true when the swapchain needs to be recreated.
-    bool NeedsRecreation(bool is_srgb) const {
+    bool NeedsRecreation() const {
-        return HasColorSpaceChanged(is_srgb) || IsSubOptimal() || NeedsPresentModeUpdate();
+        return IsSubOptimal() || NeedsPresentModeUpdate();
-    }
-
-    /// Returns true when the color space has changed.
-    bool HasColorSpaceChanged(bool is_srgb) const {
-        return current_srgb != is_srgb;
     }
 
     /// Returns true when the swapchain is outdated.
@@ -52,11 +47,6 @@ public:
         return is_suboptimal;
     }
 
-    /// Returns true when the swapchain format is in the srgb color space
-    bool IsSrgb() const {
-        return current_srgb;
-    }
-
     VkExtent2D GetSize() const {
         return extent;
     }
@@ -110,7 +100,7 @@ public:
     }
 
 private:
-    void CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities, bool srgb);
+    void CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities);
     void CreateSemaphores();
     void CreateImageViews();
 
@@ -144,7 +134,6 @@ private:
     bool has_mailbox{false};
     bool has_fifo_relaxed{false};
 
-    bool current_srgb{};
     bool is_outdated{};
     bool is_suboptimal{};
 };

src/video_core/texture_cache/texture_cache.h

@@ -712,14 +712,15 @@ bool TextureCache<P>::BlitImage(const Tegra::Engines::Fermi2D::Surface& dst,
 }
 
 template <class P>
-typename P::ImageView* TextureCache<P>::TryFindFramebufferImageView(VAddr cpu_addr) {
+typename P::ImageView* TextureCache<P>::TryFindFramebufferImageView(
+    const Tegra::FramebufferConfig& config, VAddr cpu_addr) {
     // TODO: Properly implement this
     const auto it = page_table.find(cpu_addr >> YUZU_PAGEBITS);
     if (it == page_table.end()) {
         return nullptr;
     }
     const auto& image_map_ids = it->second;
-    boost::container::small_vector<const ImageBase*, 4> valid_images;
+    boost::container::small_vector<ImageId, 4> valid_image_ids;
     for (const ImageMapId map_id : image_map_ids) {
         const ImageMapView& map = slot_map_views[map_id];
         const ImageBase& image = slot_images[map.image_id];
@@ -729,18 +730,34 @@ typename P::ImageView* TextureCache<P>::TryFindFramebufferImageView(VAddr cpu_ad
         if (image.image_view_ids.empty()) {
             continue;
         }
-        valid_images.push_back(&image);
+        valid_image_ids.push_back(map.image_id);
     }
 
-    if (valid_images.size() == 1) [[likely]] {
+    const auto view_format = [&]() {
-        return &slot_image_views[valid_images[0]->image_view_ids.at(0)];
+        switch (config.pixel_format) {
+        case Service::android::PixelFormat::Rgb565:
+            return PixelFormat::R5G6B5_UNORM;
+        case Service::android::PixelFormat::Bgra8888:
+            return PixelFormat::B8G8R8A8_UNORM;
+        default:
+            return PixelFormat::A8B8G8R8_UNORM;
+        }
+    }();
+
+    const auto GetImageViewForFramebuffer = [&](ImageId image_id) {
+        const ImageViewInfo info{ImageViewType::e2D, view_format};
+        return &slot_image_views[FindOrEmplaceImageView(image_id, info)];
+    };
+
+    if (valid_image_ids.size() == 1) [[likely]] {
+        return GetImageViewForFramebuffer(valid_image_ids.front());
     }
 
-    if (valid_images.size() > 0) [[unlikely]] {
+    if (valid_image_ids.size() > 0) [[unlikely]] {
-        std::ranges::sort(valid_images, [](const auto* a, const auto* b) {
+        auto most_recent = std::ranges::max_element(valid_image_ids, [&](auto a, auto b) {
-            return a->modification_tick > b->modification_tick;
+            return slot_images[a].modification_tick < slot_images[b].modification_tick;
         });
-        return &slot_image_views[valid_images[0]->image_view_ids.at(0)];
+        return GetImageViewForFramebuffer(*most_recent);
     }
 
     return nullptr;

src/video_core/texture_cache/texture_cache_base.h

@@ -209,7 +209,8 @@ public:
                    const Tegra::Engines::Fermi2D::Config& copy);
 
     /// Try to find a cached image view in the given CPU address
-    [[nodiscard]] ImageView* TryFindFramebufferImageView(VAddr cpu_addr);
+    [[nodiscard]] ImageView* TryFindFramebufferImageView(const Tegra::FramebufferConfig& config,
+                                                         VAddr cpu_addr);
 
     /// Return true when there are uncommitted images to be downloaded
     [[nodiscard]] bool HasUncommittedFlushes() const noexcept;