vfs_concat: fix time complexity of read

Add a 5ms tiemout to the DSP processing wait

externals/CMakeLists.txt

@@ -8,21 +8,15 @@ set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
 # Disable tests in all externals supporting the standard option name
 set(BUILD_TESTING OFF)
 
-# Build only static externals
-set(BUILD_SHARED_LIBS OFF)
-
-# Skip install rules for all externals
-set_directory_properties(PROPERTIES EXCLUDE_FROM_ALL ON)
-
 # xbyak
 if ((ARCHITECTURE_x86 OR ARCHITECTURE_x86_64) AND NOT TARGET xbyak::xbyak)
-    add_subdirectory(xbyak)
+    add_subdirectory(xbyak EXCLUDE_FROM_ALL)
 endif()
 
 # Dynarmic
 if ((ARCHITECTURE_x86_64 OR ARCHITECTURE_arm64) AND NOT TARGET dynarmic::dynarmic)
     set(DYNARMIC_IGNORE_ASSERTS ON)
-    add_subdirectory(dynarmic)
+    add_subdirectory(dynarmic EXCLUDE_FROM_ALL)
     add_library(dynarmic::dynarmic ALIAS dynarmic)
 endif()
 
@@ -40,7 +34,7 @@ if (NOT TARGET inih::INIReader)
 endif()
 
 # mbedtls
-add_subdirectory(mbedtls)
+add_subdirectory(mbedtls EXCLUDE_FROM_ALL)
 target_include_directories(mbedtls PUBLIC ./mbedtls/include)
 
 # MicroProfile
@@ -54,7 +48,7 @@ endif()
 
 # libusb
 if (ENABLE_LIBUSB AND NOT TARGET libusb::usb)
-    add_subdirectory(libusb)
+    add_subdirectory(libusb EXCLUDE_FROM_ALL)
 endif()
 
 # SDL2
@@ -73,16 +67,18 @@ if (YUZU_USE_EXTERNAL_SDL2)
 
         set(HIDAPI ON)
     endif()
+    set(SDL_STATIC ON)
+    set(SDL_SHARED OFF)
     if (APPLE)
         set(SDL_FILE ON)
     endif()
 
-    add_subdirectory(SDL)
+    add_subdirectory(SDL EXCLUDE_FROM_ALL)
 endif()
 
 # ENet
 if (NOT TARGET enet::enet)
-    add_subdirectory(enet)
+    add_subdirectory(enet EXCLUDE_FROM_ALL)
     target_include_directories(enet INTERFACE ./enet/include)
     add_library(enet::enet ALIAS enet)
 endif()
@@ -90,26 +86,24 @@ endif()
 # Cubeb
 if (ENABLE_CUBEB AND NOT TARGET cubeb::cubeb)
     set(BUILD_TESTS OFF)
-    set(BUILD_TOOLS OFF)
-    add_subdirectory(cubeb)
+    add_subdirectory(cubeb EXCLUDE_FROM_ALL)
     add_library(cubeb::cubeb ALIAS cubeb)
 endif()
 
 # DiscordRPC
 if (USE_DISCORD_PRESENCE AND NOT TARGET DiscordRPC::discord-rpc)
-    set(BUILD_EXAMPLES OFF)
-    add_subdirectory(discord-rpc)
+    add_subdirectory(discord-rpc EXCLUDE_FROM_ALL)
     target_include_directories(discord-rpc INTERFACE ./discord-rpc/include)
     add_library(DiscordRPC::discord-rpc ALIAS discord-rpc)
 endif()
 
 # Sirit
-add_subdirectory(sirit)
+add_subdirectory(sirit EXCLUDE_FROM_ALL)
 
 # httplib
 if (ENABLE_WEB_SERVICE AND NOT TARGET httplib::httplib)
     set(HTTPLIB_REQUIRE_OPENSSL ON)
-    add_subdirectory(cpp-httplib)
+    add_subdirectory(cpp-httplib EXCLUDE_FROM_ALL)
 endif()
 
 # cpp-jwt
@@ -117,12 +111,12 @@ if (ENABLE_WEB_SERVICE AND NOT TARGET cpp-jwt::cpp-jwt)
     set(CPP_JWT_BUILD_EXAMPLES OFF)
     set(CPP_JWT_BUILD_TESTS OFF)
     set(CPP_JWT_USE_VENDORED_NLOHMANN_JSON OFF)
-    add_subdirectory(cpp-jwt)
+    add_subdirectory(cpp-jwt EXCLUDE_FROM_ALL)
 endif()
 
 # Opus
 if (NOT TARGET Opus::opus)
-    add_subdirectory(opus)
+    add_subdirectory(opus EXCLUDE_FROM_ALL)
 endif()
 
 # FFMpeg
@@ -136,14 +130,16 @@ endif()
 
 # Vulkan-Headers
 if (YUZU_USE_EXTERNAL_VULKAN_HEADERS)
-    add_subdirectory(Vulkan-Headers)
+    add_subdirectory(Vulkan-Headers EXCLUDE_FROM_ALL)
 endif()
 
 if (NOT TARGET LLVM::Demangle)
-    add_library(demangle demangle/ItaniumDemangle.cpp)
+    add_library(demangle STATIC)
     target_include_directories(demangle PUBLIC ./demangle)
+    target_sources(demangle PRIVATE demangle/ItaniumDemangle.cpp)
     add_library(LLVM::Demangle ALIAS demangle)
 endif()
 
-add_library(stb stb/stb_dxt.cpp)
+add_library(stb STATIC)
 target_include_directories(stb PUBLIC ./stb)
+target_sources(stb PRIVATE stb/stb_dxt.cpp)

externals/glad/CMakeLists.txt

@@ -1,7 +1,7 @@
 # SPDX-FileCopyrightText: 2015 Yuri Kunde Schlesner <yuriks@yuriks.net>
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-add_library(glad
+add_library(glad STATIC
     src/glad.c
     include/KHR/khrplatform.h
     include/glad/glad.h

externals/libusb/CMakeLists.txt

@@ -122,7 +122,7 @@ else() # MINGW OR (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
         add_compile_options(/utf-8)
     endif()
 
-    add_library(usb
+    add_library(usb STATIC EXCLUDE_FROM_ALL
         libusb/libusb/core.c
         libusb/libusb/core.c
         libusb/libusb/descriptor.c

externals/opus/CMakeLists.txt

@@ -23,7 +23,7 @@ else()
     endif()
 endif()
 
-add_library(opus
+add_library(opus STATIC
     # CELT sources
     opus/celt/bands.c
     opus/celt/celt.c

src/audio_core/renderer/adsp/audio_renderer.cpp

@@ -154,6 +154,11 @@ void AudioRenderer::ThreadFunc() {
             return;
 
         case RenderMessage::AudioRenderer_Render: {
+            if (system.IsShuttingDown()) [[unlikely]] {
+                std::this_thread::sleep_for(std::chrono::milliseconds(5));
+                mailbox->ADSPSendMessage(RenderMessage::AudioRenderer_RenderResponse);
+                continue;
+            }
             std::array<bool, MaxRendererSessions> buffers_reset{};
             std::array<u64, MaxRendererSessions> render_times_taken{};
             const auto start_time{system.CoreTiming().GetClockTicks()};

src/audio_core/renderer/system_manager.cpp

@@ -27,7 +27,7 @@ bool SystemManager::InitializeUnsafe() {
     if (!active) {
         if (adsp.Start()) {
             active = true;
-            thread = std::jthread([this](std::stop_token stop_token) { ThreadFunc(); });
+            thread = std::jthread([this](std::stop_token stop_token) { ThreadFunc(stop_token); });
         }
     }
 
@@ -39,8 +39,7 @@ void SystemManager::Stop() {
         return;
     }
     active = false;
-    update.store(true);
-    update.notify_all();
+    thread.request_stop();
     thread.join();
     adsp.Stop();
 }
@@ -85,12 +84,12 @@ bool SystemManager::Remove(System& system_) {
     return true;
 }
 
-void SystemManager::ThreadFunc() {
+void SystemManager::ThreadFunc(std::stop_token stop_token) {
     static constexpr char name[]{"AudioRenderSystemManager"};
     MicroProfileOnThreadCreate(name);
     Common::SetCurrentThreadName(name);
     Common::SetCurrentThreadPriority(Common::ThreadPriority::High);
-    while (active) {
+    while (active && !stop_token.stop_requested()) {
         {
             std::scoped_lock l{mutex1};
 

src/audio_core/renderer/system_manager.h

@@ -66,13 +66,7 @@ private:
     /**
      * Main thread responsible for command generation.
      */
-    void ThreadFunc();
-
-    enum class StreamState {
-        Filling,
-        Steady,
-        Draining,
-    };
+    void ThreadFunc(std::stop_token stop_token);
 
     /// Core system
     Core::System& core;
@@ -90,8 +84,6 @@ private:
     ADSP::ADSP& adsp;
     /// AudioRenderer mailbox for communication
     ADSP::AudioRenderer_Mailbox* mailbox{};
-    /// Atomic for main thread to wait on
-    std::atomic<bool> update{};
 };
 
 } // namespace AudioCore::AudioRenderer

src/audio_core/sink/sink_stream.cpp

@@ -271,8 +271,8 @@ u64 SinkStream::GetExpectedPlayedSampleCount() {
 
 void SinkStream::WaitFreeSpace() {
     std::unique_lock lk{release_mutex};
-    release_cv.wait(
-        lk, [this]() { return queued_buffers < max_queue_size || system.IsShuttingDown(); });
+    release_cv.wait_for(lk, std::chrono::milliseconds(5),
+                        [this]() { return queued_buffers < max_queue_size; });
 }
 
 } // namespace AudioCore::Sink

src/core/core.cpp

@@ -117,8 +117,7 @@ FileSys::VirtualFile GetGameFileFromPath(const FileSys::VirtualFilesystem& vfs,
             return nullptr;
         }
 
-        return FileSys::ConcatenatedVfsFile::MakeConcatenatedFile(std::move(concat),
-                                                                  dir->GetName());
+        return FileSys::ConcatenatedVfsFile::MakeConcatenatedFile(concat, dir->GetName());
     }
 
     if (Common::FS::IsDir(path)) {

src/core/file_sys/romfs.cpp

@@ -140,7 +140,8 @@ VirtualFile CreateRomFS(VirtualDir dir, VirtualDir ext) {
         return nullptr;
 
     RomFSBuildContext ctx{dir, ext};
-    return ConcatenatedVfsFile::MakeConcatenatedFile(0, ctx.Build(), dir->GetName());
+    auto file_map = ctx.Build();
+    return ConcatenatedVfsFile::MakeConcatenatedFile(0, file_map, dir->GetName());
 }
 
 } // namespace FileSys

src/core/file_sys/vfs_concat.cpp

@@ -10,84 +10,105 @@
 
 namespace FileSys {
 
-static bool VerifyConcatenationMapContinuity(const std::multimap<u64, VirtualFile>& map) {
-    const auto last_valid = --map.end();
-    for (auto iter = map.begin(); iter != last_valid;) {
-        const auto old = iter++;
-        if (old->first + old->second->GetSize() != iter->first) {
+ConcatenatedVfsFile::ConcatenatedVfsFile(ConcatenationMap&& concatenation_map_, std::string&& name_)
+    : concatenation_map(std::move(concatenation_map_)), name(std::move(name_)) {
+    DEBUG_ASSERT(this->VerifyContinuity());
+}
+
+bool ConcatenatedVfsFile::VerifyContinuity() const {
+    u64 last_offset = 0;
+    for (auto& entry : concatenation_map) {
+        if (entry.offset != last_offset) {
             return false;
         }
+
+        last_offset = entry.offset + entry.file->GetSize();
     }
 
-    return map.begin()->first == 0;
-}
-
-ConcatenatedVfsFile::ConcatenatedVfsFile(std::vector<VirtualFile> files_, std::string name_)
-    : name(std::move(name_)) {
-    std::size_t next_offset = 0;
-    for (const auto& file : files_) {
-        files.emplace(next_offset, file);
-        next_offset += file->GetSize();
-    }
-}
-
-ConcatenatedVfsFile::ConcatenatedVfsFile(std::multimap<u64, VirtualFile> files_, std::string name_)
-    : files(std::move(files_)), name(std::move(name_)) {
-    ASSERT(VerifyConcatenationMapContinuity(files));
+    return true;
 }
 
 ConcatenatedVfsFile::~ConcatenatedVfsFile() = default;
 
-VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(std::vector<VirtualFile> files,
-                                                      std::string name) {
-    if (files.empty())
+VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(const std::vector<VirtualFile>& files,
+                                                      std::string&& name) {
+    // Fold trivial cases.
+    if (files.empty()) {
         return nullptr;
-    if (files.size() == 1)
-        return files[0];
+    }
+    if (files.size() == 1) {
+        return files.front();
+    }
 
-    return VirtualFile(new ConcatenatedVfsFile(std::move(files), std::move(name)));
+    // Make the concatenation map from the input.
+    std::vector<ConcatenationEntry> concatenation_map;
+    concatenation_map.reserve(files.size());
+    u64 last_offset = 0;
+
+    for (auto& file : files) {
+        concatenation_map.emplace_back(ConcatenationEntry{
+            .offset = last_offset,
+            .file = file,
+        });
+
+        last_offset += file->GetSize();
+    }
+
+    return VirtualFile(new ConcatenatedVfsFile(std::move(concatenation_map), std::move(name)));
 }
 
 VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte,
-                                                      std::multimap<u64, VirtualFile> files,
-                                                      std::string name) {
-    if (files.empty())
+                                                      const std::multimap<u64, VirtualFile>& files,
+                                                      std::string&& name) {
+    // Fold trivial cases.
+    if (files.empty()) {
         return nullptr;
-    if (files.size() == 1)
+    }
+    if (files.size() == 1) {
         return files.begin()->second;
-
-    const auto last_valid = --files.end();
-    for (auto iter = files.begin(); iter != last_valid;) {
-        const auto old = iter++;
-        if (old->first + old->second->GetSize() != iter->first) {
-            files.emplace(old->first + old->second->GetSize(),
-                          std::make_shared<StaticVfsFile>(filler_byte, iter->first - old->first -
-                                                                           old->second->GetSize()));
-        }
     }
 
-    // Ensure the map starts at offset 0 (start of file), otherwise pad to fill.
-    if (files.begin()->first != 0)
-        files.emplace(0, std::make_shared<StaticVfsFile>(filler_byte, files.begin()->first));
+    // Make the concatenation map from the input.
+    std::vector<ConcatenationEntry> concatenation_map;
 
-    return VirtualFile(new ConcatenatedVfsFile(std::move(files), std::move(name)));
+    concatenation_map.reserve(files.size());
+    u64 last_offset = 0;
+
+    // Iteration of a multimap is ordered, so offset will be strictly non-decreasing.
+    for (auto& [offset, file] : files) {
+        if (offset > last_offset) {
+            concatenation_map.emplace_back(ConcatenationEntry{
+                .offset = last_offset,
+                .file = std::make_shared<StaticVfsFile>(filler_byte, offset - last_offset),
+            });
+        }
+
+        concatenation_map.emplace_back(ConcatenationEntry{
+            .offset = offset,
+            .file = file,
+        });
+
+        last_offset = offset + file->GetSize();
+    }
+
+    return VirtualFile(new ConcatenatedVfsFile(std::move(concatenation_map), std::move(name)));
 }
 
 std::string ConcatenatedVfsFile::GetName() const {
-    if (files.empty()) {
+    if (concatenation_map.empty()) {
         return "";
     }
     if (!name.empty()) {
         return name;
     }
-    return files.begin()->second->GetName();
+    return concatenation_map.front().file->GetName();
 }
 
 std::size_t ConcatenatedVfsFile::GetSize() const {
-    if (files.empty()) {
+    if (concatenation_map.empty()) {
         return 0;
     }
-    return files.rbegin()->first + files.rbegin()->second->GetSize();
+    return concatenation_map.back().offset + concatenation_map.back().file->GetSize();
 }
 
 bool ConcatenatedVfsFile::Resize(std::size_t new_size) {
@@ -95,10 +116,10 @@ bool ConcatenatedVfsFile::Resize(std::size_t new_size) {
 }
 
 VirtualDir ConcatenatedVfsFile::GetContainingDirectory() const {
-    if (files.empty()) {
+    if (concatenation_map.empty()) {
         return nullptr;
     }
-    return files.begin()->second->GetContainingDirectory();
+    return concatenation_map.front().file->GetContainingDirectory();
 }
 
 bool ConcatenatedVfsFile::IsWritable() const {
@@ -110,25 +131,45 @@ bool ConcatenatedVfsFile::IsReadable() const {
 }
 
 std::size_t ConcatenatedVfsFile::Read(u8* data, std::size_t length, std::size_t offset) const {
-    auto entry = --files.end();
-    for (auto iter = files.begin(); iter != files.end(); ++iter) {
-        if (iter->first > offset) {
-            entry = --iter;
+    const ConcatenationEntry key{
+        .offset = offset,
+        .file = nullptr,
+    };
+
+    // Read nothing if the map is empty.
+    if (concatenation_map.empty()) {
+        return 0;
+    }
+
+    // Binary search to find the iterator to the first position we can check.
+    // It must exist, since we are not empty and are comparing unsigned integers.
+    auto it = std::prev(std::upper_bound(concatenation_map.begin(), concatenation_map.end(), key));
+    u64 cur_length = length;
+    u64 cur_offset = offset;
+
+    while (cur_length > 0 && it != concatenation_map.end()) {
+        // Check if we can read the file at this position.
+        const auto& file = it->file;
+        const u64 file_offset = it->offset;
+        const u64 file_size = file->GetSize();
+
+        if (cur_offset >= file_offset + file_size) {
+            // Entirely out of bounds read.
             break;
         }
+
+        // Read the file at this position.
+        const u64 intended_read_size = std::min<u64>(cur_length, file_size);
+        const u64 actual_read_size =
+            file->Read(data + (cur_offset - offset), intended_read_size, cur_offset - file_offset);
+
+        // Update tracking.
+        cur_offset += actual_read_size;
+        cur_length -= actual_read_size;
+        it++;
     }
 
-    if (entry->first + entry->second->GetSize() <= offset)
-        return 0;
-
-    const auto read_in =
-        std::min<u64>(entry->first + entry->second->GetSize() - offset, entry->second->GetSize());
-    if (length > read_in) {
-        return entry->second->Read(data, read_in, offset - entry->first) +
-               Read(data + read_in, length - read_in, offset + read_in);
-    }
-
-    return entry->second->Read(data, std::min<u64>(read_in, length), offset - entry->first);
+    return cur_offset - offset;
 }
 
 std::size_t ConcatenatedVfsFile::Write(const u8* data, std::size_t length, std::size_t offset) {

src/core/file_sys/vfs_concat.h

@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <compare>
 #include <map>
 #include <memory>
 #include "core/file_sys/vfs.h"
@@ -12,19 +13,33 @@ namespace FileSys {
 // Class that wraps multiple vfs files and concatenates them, making reads seamless. Currently
 // read-only.
 class ConcatenatedVfsFile : public VfsFile {
-    explicit ConcatenatedVfsFile(std::vector<VirtualFile> files, std::string name_);
-    explicit ConcatenatedVfsFile(std::multimap<u64, VirtualFile> files, std::string name_);
+private:
+    struct ConcatenationEntry {
+        u64 offset;
+        VirtualFile file;
+
+        auto operator<=>(const ConcatenationEntry& other) const {
+            return this->offset <=> other.offset;
+        }
+    };
+    using ConcatenationMap = std::vector<ConcatenationEntry>;
+
+    explicit ConcatenatedVfsFile(std::vector<ConcatenationEntry>&& concatenation_map,
+                                 std::string&& name);
+    bool VerifyContinuity() const;
 
 public:
     ~ConcatenatedVfsFile() override;
 
     /// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases.
-    static VirtualFile MakeConcatenatedFile(std::vector<VirtualFile> files, std::string name);
+    static VirtualFile MakeConcatenatedFile(const std::vector<VirtualFile>& files,
+                                            std::string&& name);
 
     /// 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::multimap<u64, VirtualFile> files,
-                                            std::string name);
+    static VirtualFile MakeConcatenatedFile(u8 filler_byte,
+                                            const std::multimap<u64, VirtualFile>& files,
+                                            std::string&& name);
 
     std::string GetName() const override;
     std::size_t GetSize() const override;
@@ -37,8 +52,7 @@ public:
     bool Rename(std::string_view new_name) override;
 
 private:
-    // Maps starting offset to file -- more efficient.
-    std::multimap<u64, VirtualFile> files;
+    ConcatenationMap concatenation_map;
     std::string name;
 };
 

src/core/hid/emulated_controller.cpp

@@ -1283,9 +1283,14 @@ bool EmulatedController::HasNfc() const {
 }
 
 bool EmulatedController::WriteNfc(const std::vector<u8>& data) {
-    auto& nfc_output_device = output_devices[3];
+    auto& nfc_output_device = output_devices[static_cast<std::size_t>(DeviceIndex::Right)];
+    auto& nfc_virtual_output_device = output_devices[3];
 
-    return nfc_output_device->WriteNfcData(data) == Common::Input::NfcState::Success;
+    if (nfc_output_device->SupportsNfc() != Common::Input::NfcState::NotSupported) {
+        return nfc_output_device->WriteNfcData(data) == Common::Input::NfcState::Success;
+    }
+
+    return nfc_virtual_output_device->WriteNfcData(data) == Common::Input::NfcState::Success;
 }
 
 void EmulatedController::SetLedPattern() {

src/core/hle/service/nfc/common/amiibo_crypto.cpp

@@ -52,9 +52,6 @@ bool IsAmiiboValid(const EncryptedNTAG215File& ntag_file) {
     if (ntag_file.compability_container != 0xEEFF10F1U) {
         return false;
     }
-    if (amiibo_data.constant_value != 0xA5) {
-        return false;
-    }
     if (amiibo_data.model_info.tag_type != NFC::PackedTagType::Type2) {
         return false;
     }

src/core/hle/service/nfc/common/device.cpp

@@ -119,18 +119,31 @@ bool NfcDevice::LoadNfcTag(std::span<const u8> data) {
 
     memcpy(&tag_data, data.data(), sizeof(NFP::EncryptedNTAG215File));
     is_plain_amiibo = NFP::AmiiboCrypto::IsAmiiboValid(tag_data);
-
-    if (is_plain_amiibo) {
-        encrypted_tag_data = NFP::AmiiboCrypto::EncodedDataToNfcData(tag_data);
-        LOG_INFO(Service_NFP, "Using plain amiibo");
-    } else {
-        tag_data = {};
-        memcpy(&encrypted_tag_data, data.data(), sizeof(NFP::EncryptedNTAG215File));
-    }
+    is_write_protected = false;
 
     device_state = DeviceState::TagFound;
     deactivate_event->GetReadableEvent().Clear();
     activate_event->Signal();
+
+    // Fallback for plain amiibos
+    if (is_plain_amiibo) {
+        LOG_INFO(Service_NFP, "Using plain amiibo");
+        encrypted_tag_data = NFP::AmiiboCrypto::EncodedDataToNfcData(tag_data);
+        return true;
+    }
+
+    // Fallback for encrypted amiibos without keys
+    if (!NFP::AmiiboCrypto::IsKeyAvailable()) {
+        LOG_INFO(Service_NFC, "Loading amiibo without keys");
+        memcpy(&encrypted_tag_data, data.data(), sizeof(NFP::EncryptedNTAG215File));
+        BuildAmiiboWithoutKeys();
+        is_plain_amiibo = true;
+        is_write_protected = true;
+        return true;
+    }
+
+    tag_data = {};
+    memcpy(&encrypted_tag_data, data.data(), sizeof(NFP::EncryptedNTAG215File));
     return true;
 }
 
@@ -346,23 +359,15 @@ Result NfcDevice::Mount(NFP::ModelType model_type, NFP::MountTarget mount_target
         return ResultWrongDeviceState;
     }
 
-    // The loaded amiibo is not encrypted
-    if (is_plain_amiibo) {
-        device_state = DeviceState::TagMounted;
-        mount_target = mount_target_;
-        return ResultSuccess;
-    }
-
     if (!NFP::AmiiboCrypto::IsAmiiboValid(encrypted_tag_data)) {
         LOG_ERROR(Service_NFP, "Not an amiibo");
         return ResultNotAnAmiibo;
     }
 
-    // Mark amiibos as read only when keys are missing
-    if (!NFP::AmiiboCrypto::IsKeyAvailable()) {
-        LOG_ERROR(Service_NFP, "No keys detected");
+    // The loaded amiibo is not encrypted
+    if (is_plain_amiibo) {
         device_state = DeviceState::TagMounted;
-        mount_target = NFP::MountTarget::Rom;
+        mount_target = mount_target_;
         return ResultSuccess;
     }
 
@@ -421,11 +426,11 @@ Result NfcDevice::Flush() {
 
     tag_data.write_counter++;
 
-    FlushWithBreak(NFP::BreakType::Normal);
+    const auto result = FlushWithBreak(NFP::BreakType::Normal);
 
     is_data_moddified = false;
 
-    return ResultSuccess;
+    return result;
 }
 
 Result NfcDevice::FlushDebug() {
@@ -444,11 +449,11 @@ Result NfcDevice::FlushDebug() {
 
     tag_data.write_counter++;
 
-    FlushWithBreak(NFP::BreakType::Normal);
+    const auto result = FlushWithBreak(NFP::BreakType::Normal);
 
     is_data_moddified = false;
 
-    return ResultSuccess;
+    return result;
 }
 
 Result NfcDevice::FlushWithBreak(NFP::BreakType break_type) {
@@ -457,6 +462,11 @@ Result NfcDevice::FlushWithBreak(NFP::BreakType break_type) {
         return ResultWrongDeviceState;
     }
 
+    if (is_write_protected) {
+        LOG_ERROR(Service_NFP, "No keys available skipping write request");
+        return ResultSuccess;
+    }
+
     std::vector<u8> data(sizeof(NFP::EncryptedNTAG215File));
     if (is_plain_amiibo) {
         memcpy(data.data(), &tag_data, sizeof(tag_data));
@@ -1033,7 +1043,6 @@ Result NfcDevice::GetAll(NFP::NfpData& data) const {
     }
 
     NFP::CommonInfo common_info{};
-    Service::Mii::MiiManager manager;
     const u64 application_id = tag_data.application_id;
 
     GetCommonInfo(common_info);
@@ -1249,6 +1258,28 @@ void NfcDevice::UpdateRegisterInfoCrc() {
     tag_data.register_info_crc = crc.checksum();
 }
 
+void NfcDevice::BuildAmiiboWithoutKeys() {
+    Service::Mii::MiiManager manager;
+    auto& settings = tag_data.settings;
+
+    tag_data = NFP::AmiiboCrypto::NfcDataToEncodedData(encrypted_tag_data);
+
+    // Common info
+    tag_data.write_counter = 0;
+    tag_data.amiibo_version = 0;
+    settings.write_date = GetAmiiboDate(GetCurrentPosixTime());
+
+    // Register info
+    SetAmiiboName(settings, {'y', 'u', 'z', 'u', 'A', 'm', 'i', 'i', 'b', 'o'});
+    settings.settings.font_region.Assign(0);
+    settings.init_date = GetAmiiboDate(GetCurrentPosixTime());
+    tag_data.owner_mii = manager.BuildFromStoreData(manager.BuildDefault(0));
+
+    // Admin info
+    settings.settings.amiibo_initialized.Assign(1);
+    settings.settings.appdata_initialized.Assign(0);
+}
+
 u64 NfcDevice::GetHandle() const {
     // Generate a handle based of the npad id
     return static_cast<u64>(npad_id);

src/core/hle/service/nfc/common/device.h

@@ -110,6 +110,8 @@ private:
     void UpdateSettingsCrc();
     void UpdateRegisterInfoCrc();
 
+    void BuildAmiiboWithoutKeys();
+
     bool is_controller_set{};
     int callback_key;
     const Core::HID::NpadIdType npad_id;
@@ -128,6 +130,7 @@ private:
     bool is_data_moddified{};
     bool is_app_area_open{};
     bool is_plain_amiibo{};
+    bool is_write_protected{};
     NFP::MountTarget mount_target{NFP::MountTarget::None};
 
     NFP::NTAG215File tag_data{};

src/input_common/drivers/joycon.cpp

@@ -291,9 +291,13 @@ Common::Input::NfcState Joycons::SupportsNfc(const PadIdentifier& identifier_) c
     return Common::Input::NfcState::Success;
 };
 
-Common::Input::NfcState Joycons::WriteNfcData(const PadIdentifier& identifier_,
+Common::Input::NfcState Joycons::WriteNfcData(const PadIdentifier& identifier,
                                               const std::vector<u8>& data) {
-    return Common::Input::NfcState::NotSupported;
+    auto handle = GetHandle(identifier);
+    if (handle->WriteNfcData(data) != Joycon::DriverResult::Success) {
+        return Common::Input::NfcState::WriteFailed;
+    }
+    return Common::Input::NfcState::Success;
 };
 
 Common::Input::DriverResult Joycons::SetPollingMode(const PadIdentifier& identifier,

src/input_common/helpers/joycon_driver.cpp

@@ -492,6 +492,26 @@ DriverResult JoyconDriver::SetRingConMode() {
     return result;
 }
 
+DriverResult JoyconDriver::WriteNfcData(std::span<const u8> data) {
+    std::scoped_lock lock{mutex};
+    disable_input_thread = true;
+
+    if (!supported_features.nfc) {
+        return DriverResult::NotSupported;
+    }
+    if (!nfc_protocol->IsEnabled()) {
+        return DriverResult::Disabled;
+    }
+    if (!amiibo_detected) {
+        return DriverResult::ErrorWritingData;
+    }
+
+    const auto result = nfc_protocol->WriteAmiibo(data);
+
+    disable_input_thread = false;
+    return result;
+}
+
 bool JoyconDriver::IsConnected() const {
     std::scoped_lock lock{mutex};
     return is_connected.load();

src/input_common/helpers/joycon_driver.h

@@ -49,6 +49,7 @@ public:
     DriverResult SetIrMode();
     DriverResult SetNfcMode();
     DriverResult SetRingConMode();
+    DriverResult WriteNfcData(std::span<const u8> data);
 
     void SetCallbacks(const JoyconCallbacks& callbacks);
 

src/input_common/helpers/joycon_protocol/joycon_types.h

@@ -23,6 +23,7 @@ constexpr std::array<u8, 8> DefaultVibrationBuffer{0x0, 0x1, 0x40, 0x40, 0x0, 0x
 
 using MacAddress = std::array<u8, 6>;
 using SerialNumber = std::array<u8, 15>;
+using TagUUID = std::array<u8, 7>;
 
 enum class ControllerType : u8 {
     None = 0x00,
@@ -276,12 +277,13 @@ enum class MCUPacketFlag : u8 {
     LastCommandPacket = 0x08,
 };
 
-enum class NFCReadCommand : u8 {
+enum class NFCCommand : u8 {
     CancelAll = 0x00,
     StartPolling = 0x01,
     StopPolling = 0x02,
     StartWaitingRecieve = 0x04,
-    Ntag = 0x06,
+    ReadNtag = 0x06,
+    WriteNtag = 0x08,
     Mifare = 0x0F,
 };
 
@@ -292,14 +294,19 @@ enum class NFCTagType : u8 {
 
 enum class NFCPages {
     Block0 = 0,
+    Block3 = 3,
     Block45 = 45,
     Block135 = 135,
     Block231 = 231,
 };
 
 enum class NFCStatus : u8 {
+    Ready = 0x00,
+    Polling = 0x01,
     LastPackage = 0x04,
+    WriteDone = 0x05,
     TagLost = 0x07,
+    WriteReady = 0x09,
 };
 
 enum class IrsMode : u8 {
@@ -559,13 +566,32 @@ static_assert(sizeof(NFCReadBlockCommand) == 0x9, "NFCReadBlockCommand is an inv
 struct NFCReadCommandData {
     u8 unknown;
     u8 uuid_length;
-    u8 unknown_2;
-    std::array<u8, 6> uid;
+    TagUUID uid;
     NFCTagType tag_type;
     NFCReadBlockCommand read_block;
 };
 static_assert(sizeof(NFCReadCommandData) == 0x13, "NFCReadCommandData is an invalid size");
 
+#pragma pack(push, 1)
+struct NFCWriteCommandData {
+    u8 unknown;
+    u8 uuid_length;
+    TagUUID uid;
+    NFCTagType tag_type;
+    u8 unknown2;
+    u8 unknown3;
+    u8 unknown4;
+    u8 unknown5;
+    u8 unknown6;
+    u8 unknown7;
+    u8 unknown8;
+    u8 magic;
+    u16_be write_count;
+    u8 amiibo_version;
+};
+static_assert(sizeof(NFCWriteCommandData) == 0x15, "NFCWriteCommandData is an invalid size");
+#pragma pack(pop)
+
 struct NFCPollingCommandData {
     u8 enable_mifare;
     u8 unknown_1;
@@ -576,8 +602,8 @@ struct NFCPollingCommandData {
 static_assert(sizeof(NFCPollingCommandData) == 0x05, "NFCPollingCommandData is an invalid size");
 
 struct NFCRequestState {
-    NFCReadCommand command_argument;
-    INSERT_PADDING_BYTES(0x1);
+    NFCCommand command_argument;
+    u8 block_id;
     u8 packet_id;
     MCUPacketFlag packet_flag;
     u8 data_length;
@@ -591,6 +617,18 @@ struct NFCRequestState {
 };
 static_assert(sizeof(NFCRequestState) == 0x26, "NFCRequestState is an invalid size");
 
+struct NFCDataChunk {
+    u8 nfc_page;
+    u8 data_size;
+    std::array<u8, 0xFF> data;
+};
+
+struct NFCWritePackage {
+    NFCWriteCommandData command_data;
+    u8 number_of_chunks;
+    std::array<NFCDataChunk, 4> data_chunks;
+};
+
 struct IrsConfigure {
     MCUCommand command;
     MCUSubCommand sub_command;

src/input_common/helpers/joycon_protocol/nfc.cpp

@@ -34,6 +34,12 @@ DriverResult NfcProtocol::EnableNfc() {
 
         result = ConfigureMCU(config);
     }
+    if (result == DriverResult::Success) {
+        result = WaitSetMCUMode(ReportMode::NFC_IR_MODE_60HZ, MCUMode::NFC);
+    }
+    if (result == DriverResult::Success) {
+        result = WaitUntilNfcIs(NFCStatus::Ready);
+    }
 
     return result;
 }
@@ -56,27 +62,20 @@ DriverResult NfcProtocol::StartNFCPollingMode() {
     LOG_DEBUG(Input, "Start NFC pooling Mode");
     ScopedSetBlocking sb(this);
     DriverResult result{DriverResult::Success};
-    TagFoundData tag_data{};
 
-    if (result == DriverResult::Success) {
-        result = WaitSetMCUMode(ReportMode::NFC_IR_MODE_60HZ, MCUMode::NFC);
-    }
-    if (result == DriverResult::Success) {
-        result = WaitUntilNfcIsReady();
-    }
     if (result == DriverResult::Success) {
         MCUCommandResponse output{};
         result = SendStopPollingRequest(output);
     }
     if (result == DriverResult::Success) {
-        result = WaitUntilNfcIsReady();
+        result = WaitUntilNfcIs(NFCStatus::Ready);
     }
     if (result == DriverResult::Success) {
         MCUCommandResponse output{};
         result = SendStartPollingRequest(output);
     }
     if (result == DriverResult::Success) {
-        result = WaitUntilNfcIsPolling();
+        result = WaitUntilNfcIs(NFCStatus::Polling);
     }
     if (result == DriverResult::Success) {
         is_enabled = true;
@@ -112,6 +111,49 @@ DriverResult NfcProtocol::ScanAmiibo(std::vector<u8>& data) {
     return result;
 }
 
+DriverResult NfcProtocol::WriteAmiibo(std::span<const u8> data) {
+    LOG_DEBUG(Input, "Write amiibo");
+    ScopedSetBlocking sb(this);
+    DriverResult result{DriverResult::Success};
+    TagUUID tag_uuid = GetTagUUID(data);
+    TagFoundData tag_data{};
+
+    if (result == DriverResult::Success) {
+        result = IsTagInRange(tag_data, 7);
+    }
+    if (result == DriverResult::Success) {
+        if (tag_data.uuid != tag_uuid) {
+            result = DriverResult::InvalidParameters;
+        }
+    }
+    if (result == DriverResult::Success) {
+        MCUCommandResponse output{};
+        result = SendStopPollingRequest(output);
+    }
+    if (result == DriverResult::Success) {
+        result = WaitUntilNfcIs(NFCStatus::Ready);
+    }
+    if (result == DriverResult::Success) {
+        MCUCommandResponse output{};
+        result = SendStartPollingRequest(output, true);
+    }
+    if (result == DriverResult::Success) {
+        result = WaitUntilNfcIs(NFCStatus::WriteReady);
+    }
+    if (result == DriverResult::Success) {
+        result = WriteAmiiboData(tag_uuid, data);
+    }
+    if (result == DriverResult::Success) {
+        result = WaitUntilNfcIs(NFCStatus::WriteDone);
+    }
+    if (result == DriverResult::Success) {
+        MCUCommandResponse output{};
+        result = SendStopPollingRequest(output);
+    }
+
+    return result;
+}
+
 bool NfcProtocol::HasAmiibo() {
     if (update_counter++ < AMIIBO_UPDATE_DELAY) {
         return true;
@@ -129,7 +171,7 @@ bool NfcProtocol::HasAmiibo() {
     return result == DriverResult::Success;
 }
 
-DriverResult NfcProtocol::WaitUntilNfcIsReady() {
+DriverResult NfcProtocol::WaitUntilNfcIs(NFCStatus status) {
     constexpr std::size_t timeout_limit = 10;
     MCUCommandResponse output{};
     std::size_t tries = 0;
@@ -145,28 +187,7 @@ DriverResult NfcProtocol::WaitUntilNfcIsReady() {
         }
     } while (output.mcu_report != MCUReport::NFCState ||
              (output.mcu_data[1] << 8) + output.mcu_data[0] != 0x0500 ||
-             output.mcu_data[5] != 0x31 || output.mcu_data[6] != 0x00);
-
-    return DriverResult::Success;
-}
-
-DriverResult NfcProtocol::WaitUntilNfcIsPolling() {
-    constexpr std::size_t timeout_limit = 10;
-    MCUCommandResponse output{};
-    std::size_t tries = 0;
-
-    do {
-        auto result = SendNextPackageRequest(output, {});
-
-        if (result != DriverResult::Success) {
-            return result;
-        }
-        if (tries++ > timeout_limit) {
-            return DriverResult::Timeout;
-        }
-    } while (output.mcu_report != MCUReport::NFCState ||
-             (output.mcu_data[1] << 8) + output.mcu_data[0] != 0x0500 ||
-             output.mcu_data[5] != 0x31 || output.mcu_data[6] != 0x01);
+             output.mcu_data[5] != 0x31 || output.mcu_data[6] != static_cast<u8>(status));
 
     return DriverResult::Success;
 }
@@ -188,7 +209,7 @@ DriverResult NfcProtocol::IsTagInRange(TagFoundData& data, std::size_t timeout_l
              (output.mcu_data[6] != 0x09 && output.mcu_data[6] != 0x04));
 
     data.type = output.mcu_data[12];
-    data.uuid.resize(output.mcu_data[14]);
+    data.uuid_size = std::min(output.mcu_data[14], static_cast<u8>(sizeof(TagUUID)));
     memcpy(data.uuid.data(), output.mcu_data.data() + 15, data.uuid.size());
 
     return DriverResult::Success;
@@ -245,17 +266,94 @@ DriverResult NfcProtocol::GetAmiiboData(std::vector<u8>& ntag_data) {
     return DriverResult::Timeout;
 }
 
-DriverResult NfcProtocol::SendStartPollingRequest(MCUCommandResponse& output) {
+DriverResult NfcProtocol::WriteAmiiboData(const TagUUID& tag_uuid, std::span<const u8> data) {
+    constexpr std::size_t timeout_limit = 60;
+    const auto nfc_data = MakeAmiiboWritePackage(tag_uuid, data);
+    const std::vector<u8> nfc_buffer_data = SerializeWritePackage(nfc_data);
+    std::span<const u8> buffer(nfc_buffer_data);
+    MCUCommandResponse output{};
+    u8 block_id = 1;
+    u8 package_index = 0;
+    std::size_t tries = 0;
+    std::size_t current_position = 0;
+
+    LOG_INFO(Input, "Writing amiibo data");
+
+    auto result = SendWriteAmiiboRequest(output, tag_uuid);
+
+    if (result != DriverResult::Success) {
+        return result;
+    }
+
+    // Read Tag data but ignore the actual sent data
+    while (tries++ < timeout_limit) {
+        result = SendNextPackageRequest(output, package_index);
+        const auto nfc_status = static_cast<NFCStatus>(output.mcu_data[6]);
+
+        if (result != DriverResult::Success) {
+            return result;
+        }
+
+        if ((output.mcu_report == MCUReport::NFCReadData ||
+             output.mcu_report == MCUReport::NFCState) &&
+            nfc_status == NFCStatus::TagLost) {
+            return DriverResult::ErrorReadingData;
+        }
+
+        if (output.mcu_report == MCUReport::NFCReadData && output.mcu_data[1] == 0x07) {
+            package_index++;
+            continue;
+        }
+
+        if (output.mcu_report == MCUReport::NFCState && nfc_status == NFCStatus::LastPackage) {
+            LOG_INFO(Input, "Finished reading amiibo");
+            break;
+        }
+    }
+
+    // Send Data. Nfc buffer size is 31, Send the data in smaller packages
+    while (current_position < buffer.size() && tries++ < timeout_limit) {
+        const std::size_t next_position =
+            std::min(current_position + sizeof(NFCRequestState::raw_data), buffer.size());
+        const std::size_t block_size = next_position - current_position;
+        const bool is_last_packet = block_size < sizeof(NFCRequestState::raw_data);
+
+        SendWriteDataAmiiboRequest(output, block_id, is_last_packet,
+                                   buffer.subspan(current_position, block_size));
+
+        const auto nfc_status = static_cast<NFCStatus>(output.mcu_data[6]);
+
+        if ((output.mcu_report == MCUReport::NFCReadData ||
+             output.mcu_report == MCUReport::NFCState) &&
+            nfc_status == NFCStatus::TagLost) {
+            return DriverResult::ErrorReadingData;
+        }
+
+        // Increase position when data is confirmed by the joycon
+        if (output.mcu_report == MCUReport::NFCState &&
+            (output.mcu_data[1] << 8) + output.mcu_data[0] == 0x0500 &&
+            output.mcu_data[3] == block_id) {
+            block_id++;
+            current_position = next_position;
+        }
+    }
+
+    return result;
+}
+
+DriverResult NfcProtocol::SendStartPollingRequest(MCUCommandResponse& output,
+                                                  bool is_second_attempt) {
     NFCRequestState request{
-        .command_argument = NFCReadCommand::StartPolling,
-        .packet_id = 0x0,
+        .command_argument = NFCCommand::StartPolling,
+        .block_id = {},
+        .packet_id = {},
         .packet_flag = MCUPacketFlag::LastCommandPacket,
         .data_length = sizeof(NFCPollingCommandData),
         .nfc_polling =
             {
-                .enable_mifare = 0x01,
-                .unknown_1 = 0x00,
-                .unknown_2 = 0x00,
+                .enable_mifare = 0x00,
+                .unknown_1 = static_cast<u8>(is_second_attempt ? 0xe8 : 0x00),
+                .unknown_2 = static_cast<u8>(is_second_attempt ? 0x03 : 0x00),
                 .unknown_3 = 0x2c,
                 .unknown_4 = 0x01,
             },
@@ -271,10 +369,11 @@ DriverResult NfcProtocol::SendStartPollingRequest(MCUCommandResponse& output) {
 
 DriverResult NfcProtocol::SendStopPollingRequest(MCUCommandResponse& output) {
     NFCRequestState request{
-        .command_argument = NFCReadCommand::StopPolling,
-        .packet_id = 0x0,
+        .command_argument = NFCCommand::StopPolling,
+        .block_id = {},
+        .packet_id = {},
         .packet_flag = MCUPacketFlag::LastCommandPacket,
-        .data_length = 0,
+        .data_length = {},
         .raw_data = {},
         .crc = {},
     };
@@ -288,10 +387,11 @@ DriverResult NfcProtocol::SendStopPollingRequest(MCUCommandResponse& output) {
 
 DriverResult NfcProtocol::SendNextPackageRequest(MCUCommandResponse& output, u8 packet_id) {
     NFCRequestState request{
-        .command_argument = NFCReadCommand::StartWaitingRecieve,
+        .command_argument = NFCCommand::StartWaitingRecieve,
+        .block_id = {},
         .packet_id = packet_id,
         .packet_flag = MCUPacketFlag::LastCommandPacket,
-        .data_length = 0,
+        .data_length = {},
         .raw_data = {},
         .crc = {},
     };
@@ -305,17 +405,17 @@ DriverResult NfcProtocol::SendNextPackageRequest(MCUCommandResponse& output, u8
 
 DriverResult NfcProtocol::SendReadAmiiboRequest(MCUCommandResponse& output, NFCPages ntag_pages) {
     NFCRequestState request{
-        .command_argument = NFCReadCommand::Ntag,
-        .packet_id = 0x0,
+        .command_argument = NFCCommand::ReadNtag,
+        .block_id = {},
+        .packet_id = {},
         .packet_flag = MCUPacketFlag::LastCommandPacket,
         .data_length = sizeof(NFCReadCommandData),
         .nfc_read =
             {
                 .unknown = 0xd0,
-                .uuid_length = 0x07,
-                .unknown_2 = 0x00,
+                .uuid_length = sizeof(NFCReadCommandData::uid),
                 .uid = {},
-                .tag_type = NFCTagType::AllTags,
+                .tag_type = NFCTagType::Ntag215,
                 .read_block = GetReadBlockCommand(ntag_pages),
             },
         .crc = {},
@@ -328,12 +428,135 @@ DriverResult NfcProtocol::SendReadAmiiboRequest(MCUCommandResponse& output, NFCP
                        output);
 }
 
+DriverResult NfcProtocol::SendWriteAmiiboRequest(MCUCommandResponse& output,
+                                                 const TagUUID& tag_uuid) {
+    NFCRequestState request{
+        .command_argument = NFCCommand::ReadNtag,
+        .block_id = {},
+        .packet_id = {},
+        .packet_flag = MCUPacketFlag::LastCommandPacket,
+        .data_length = sizeof(NFCReadCommandData),
+        .nfc_read =
+            {
+                .unknown = 0xd0,
+                .uuid_length = sizeof(NFCReadCommandData::uid),
+                .uid = tag_uuid,
+                .tag_type = NFCTagType::Ntag215,
+                .read_block = GetReadBlockCommand(NFCPages::Block3),
+            },
+        .crc = {},
+    };
+
+    std::array<u8, sizeof(NFCRequestState)> request_data{};
+    memcpy(request_data.data(), &request, sizeof(NFCRequestState));
+    request_data[36] = CalculateMCU_CRC8(request_data.data(), 36);
+    return SendMCUData(ReportMode::NFC_IR_MODE_60HZ, MCUSubCommand::ReadDeviceMode, request_data,
+                       output);
+}
+
+DriverResult NfcProtocol::SendWriteDataAmiiboRequest(MCUCommandResponse& output, u8 block_id,
+                                                     bool is_last_packet,
+                                                     std::span<const u8> data) {
+    const auto data_size = std::min(data.size(), sizeof(NFCRequestState::raw_data));
+    NFCRequestState request{
+        .command_argument = NFCCommand::WriteNtag,
+        .block_id = block_id,
+        .packet_id = {},
+        .packet_flag =
+            is_last_packet ? MCUPacketFlag::LastCommandPacket : MCUPacketFlag::MorePacketsRemaining,
+        .data_length = static_cast<u8>(data_size),
+        .raw_data = {},
+        .crc = {},
+    };
+    memcpy(request.raw_data.data(), data.data(), data_size);
+
+    std::array<u8, sizeof(NFCRequestState)> request_data{};
+    memcpy(request_data.data(), &request, sizeof(NFCRequestState));
+    request_data[36] = CalculateMCU_CRC8(request_data.data(), 36);
+    return SendMCUData(ReportMode::NFC_IR_MODE_60HZ, MCUSubCommand::ReadDeviceMode, request_data,
+                       output);
+}
+
+std::vector<u8> NfcProtocol::SerializeWritePackage(const NFCWritePackage& package) const {
+    const std::size_t header_size =
+        sizeof(NFCWriteCommandData) + sizeof(NFCWritePackage::number_of_chunks);
+    std::vector<u8> serialized_data(header_size);
+    std::size_t start_index = 0;
+
+    memcpy(serialized_data.data(), &package, header_size);
+    start_index += header_size;
+
+    for (const auto& data_chunk : package.data_chunks) {
+        const std::size_t chunk_size =
+            sizeof(NFCDataChunk::nfc_page) + sizeof(NFCDataChunk::data_size) + data_chunk.data_size;
+
+        serialized_data.resize(start_index + chunk_size);
+        memcpy(serialized_data.data() + start_index, &data_chunk, chunk_size);
+        start_index += chunk_size;
+    }
+
+    return serialized_data;
+}
+
+NFCWritePackage NfcProtocol::MakeAmiiboWritePackage(const TagUUID& tag_uuid,
+                                                    std::span<const u8> data) const {
+    return {
+        .command_data{
+            .unknown = 0xd0,
+            .uuid_length = sizeof(NFCReadCommandData::uid),
+            .uid = tag_uuid,
+            .tag_type = NFCTagType::Ntag215,
+            .unknown2 = 0x00,
+            .unknown3 = 0x01,
+            .unknown4 = 0x04,
+            .unknown5 = 0xff,
+            .unknown6 = 0xff,
+            .unknown7 = 0xff,
+            .unknown8 = 0xff,
+            .magic = data[16],
+            .write_count = static_cast<u16>((data[17] << 8) + data[18]),
+            .amiibo_version = data[19],
+        },
+        .number_of_chunks = 3,
+        .data_chunks =
+            {
+                MakeAmiiboChunk(0x05, 0x20, data),
+                MakeAmiiboChunk(0x20, 0xf0, data),
+                MakeAmiiboChunk(0x5c, 0x98, data),
+            },
+    };
+}
+
+NFCDataChunk NfcProtocol::MakeAmiiboChunk(u8 page, u8 size, std::span<const u8> data) const {
+    constexpr u8 PAGE_SIZE = 4;
+
+    if (static_cast<std::size_t>(page * PAGE_SIZE) + size >= data.size()) {
+        return {};
+    }
+
+    NFCDataChunk chunk{
+        .nfc_page = page,
+        .data_size = size,
+        .data = {},
+    };
+    std::memcpy(chunk.data.data(), data.data() + (page * PAGE_SIZE), size);
+    return chunk;
+}
+
 NFCReadBlockCommand NfcProtocol::GetReadBlockCommand(NFCPages pages) const {
     switch (pages) {
     case NFCPages::Block0:
         return {
             .block_count = 1,
         };
+    case NFCPages::Block3:
+        return {
+            .block_count = 1,
+            .blocks =
+                {
+                    NFCReadBlock{0x03, 0x03},
+                },
+        };
     case NFCPages::Block45:
         return {
             .block_count = 1,
@@ -368,6 +591,17 @@ NFCReadBlockCommand NfcProtocol::GetReadBlockCommand(NFCPages pages) const {
     };
 }
 
+TagUUID NfcProtocol::GetTagUUID(std::span<const u8> data) const {
+    if (data.size() < 10) {
+        return {};
+    }
+
+    // crc byte 3 is omitted in this operation
+    return {
+        data[0], data[1], data[2], data[4], data[5], data[6], data[7],
+    };
+}
+
 bool NfcProtocol::IsEnabled() const {
     return is_enabled;
 }

src/input_common/helpers/joycon_protocol/nfc.h

@@ -27,6 +27,8 @@ public:
 
     DriverResult ScanAmiibo(std::vector<u8>& data);
 
+    DriverResult WriteAmiibo(std::span<const u8> data);
+
     bool HasAmiibo();
 
     bool IsEnabled() const;
@@ -37,18 +39,20 @@ private:
 
     struct TagFoundData {
         u8 type;
-        std::vector<u8> uuid;
+        u8 uuid_size;
+        TagUUID uuid;
     };
 
-    DriverResult WaitUntilNfcIsReady();
-
-    DriverResult WaitUntilNfcIsPolling();
+    DriverResult WaitUntilNfcIs(NFCStatus status);
 
     DriverResult IsTagInRange(TagFoundData& data, std::size_t timeout_limit = 1);
 
     DriverResult GetAmiiboData(std::vector<u8>& data);
 
-    DriverResult SendStartPollingRequest(MCUCommandResponse& output);
+    DriverResult WriteAmiiboData(const TagUUID& tag_uuid, std::span<const u8> data);
+
+    DriverResult SendStartPollingRequest(MCUCommandResponse& output,
+                                         bool is_second_attempt = false);
 
     DriverResult SendStopPollingRequest(MCUCommandResponse& output);
 
@@ -56,8 +60,21 @@ private:
 
     DriverResult SendReadAmiiboRequest(MCUCommandResponse& output, NFCPages ntag_pages);
 
+    DriverResult SendWriteAmiiboRequest(MCUCommandResponse& output, const TagUUID& tag_uuid);
+
+    DriverResult SendWriteDataAmiiboRequest(MCUCommandResponse& output, u8 block_id,
+                                            bool is_last_packet, std::span<const u8> data);
+
+    std::vector<u8> SerializeWritePackage(const NFCWritePackage& package) const;
+
+    NFCWritePackage MakeAmiiboWritePackage(const TagUUID& tag_uuid, std::span<const u8> data) const;
+
+    NFCDataChunk MakeAmiiboChunk(u8 page, u8 size, std::span<const u8> data) const;
+
     NFCReadBlockCommand GetReadBlockCommand(NFCPages pages) const;
 
+    TagUUID GetTagUUID(std::span<const u8> data) const;
+
     bool is_enabled{};
     std::size_t update_counter{};
 };

src/video_core/texture_cache/texture_cache.h

@@ -139,7 +139,6 @@ void TextureCache<P>::TickFrame() {
     TickAsyncDecode();
 
     runtime.TickFrame();
-    critical_gc = 0;
     ++frame_tick;
 
     if constexpr (IMPLEMENTS_ASYNC_DOWNLOADS) {
@@ -1507,7 +1506,7 @@ std::optional<typename TextureCache<P>::BlitImages> TextureCache<P>::GetBlitImag
         if (!copy.must_accelerate) {
             do {
                 if (!src_id && !dst_id) {
-                    break;
+                    return std::nullopt;
                 }
                 if (src_id && True(slot_images[src_id].flags & ImageFlagBits::GpuModified)) {
                     break;
@@ -1885,10 +1884,6 @@ void TextureCache<P>::RegisterImage(ImageId image_id) {
         tentative_size = EstimatedDecompressedSize(tentative_size, image.info.format);
     }
     total_used_memory += Common::AlignUp(tentative_size, 1024);
-    if (total_used_memory > critical_memory && critical_gc < GC_EMERGENCY_COUNTS) {
-        RunGarbageCollector();
-        critical_gc++;
-    }
     image.lru_index = lru_cache.Insert(image_id, frame_tick);
 
     ForEachGPUPage(image.gpu_addr, image.guest_size_bytes, [this, image_id](u64 page) {

src/video_core/texture_cache/texture_cache_base.h

@@ -427,7 +427,6 @@ private:
     u64 minimum_memory;
     u64 expected_memory;
     u64 critical_memory;
-    size_t critical_gc;
 
     struct BufferDownload {
         GPUVAddr address;

src/video_core/texture_cache/util.cpp

@@ -123,7 +123,9 @@ template <u32 GOB_EXTENT>
     return {
         .width = AdjustMipBlockSize<GOB_SIZE_X>(num_tiles.width, block_size.width, level),
         .height = AdjustMipBlockSize<GOB_SIZE_Y>(num_tiles.height, block_size.height, level),
-        .depth = AdjustMipBlockSize<GOB_SIZE_Z>(num_tiles.depth, block_size.depth, level),
+        .depth = level == 0
+                     ? block_size.depth
+                     : AdjustMipBlockSize<GOB_SIZE_Z>(num_tiles.depth, block_size.depth, level),
     };
 }
 
@@ -165,6 +167,13 @@ template <u32 GOB_EXTENT>
 }
 
 [[nodiscard]] constexpr Extent3D TileShift(const LevelInfo& info, u32 level) {
+    if (level == 0) {
+        return Extent3D{
+            .width = info.block.width,
+            .height = info.block.height,
+            .depth = info.block.depth,
+        };
+    }
     const Extent3D blocks = NumLevelBlocks(info, level);
     return Extent3D{
         .width = AdjustTileSize(info.block.width, GOB_SIZE_X, blocks.width),
@@ -1288,7 +1297,9 @@ u32 MapSizeBytes(const ImageBase& image) {
 
 static_assert(CalculateLevelSize(LevelInfo{{1920, 1080, 1}, {0, 2, 0}, {1, 1}, 2, 0}, 0) ==
               0x7f8000);
-static_assert(CalculateLevelSize(LevelInfo{{32, 32, 1}, {0, 0, 4}, {1, 1}, 4, 0}, 0) == 0x4000);
+static_assert(CalculateLevelSize(LevelInfo{{32, 32, 1}, {0, 0, 4}, {1, 1}, 4, 0}, 0) == 0x40000);
+
+static_assert(CalculateLevelSize(LevelInfo{{128, 8, 1}, {0, 4, 0}, {1, 1}, 4, 0}, 0) == 0x40000);
 
 static_assert(CalculateLevelOffset(PixelFormat::R8_SINT, {1920, 1080, 1}, {0, 2, 0}, 0, 7) ==
               0x2afc00);

src/yuzu_cmd/yuzu.cpp

@@ -227,7 +227,7 @@ int main(int argc, char** argv) {
     };
 
     while (optind < argc) {
-        int arg = getopt_long(argc, argv, "g:fhvp::c:", long_options, &option_index);
+        int arg = getopt_long(argc, argv, "g:fhvp::c:u:", long_options, &option_index);
         if (arg != -1) {
             switch (static_cast<char>(arg)) {
             case 'c':
@@ -283,7 +283,7 @@ int main(int argc, char** argv) {
                 break;
             case 'u':
                 selected_user = atoi(optarg);
-                return 0;
+                break;
             case 'v':
                 PrintVersion();
                 return 0;