Merge pull request #1667 from DarkLordZach/swkbd

am: Implement HLE software keyboard applet

src/common/string_util.cpp

@@ -214,6 +214,15 @@ std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, std::size_t
     return std::string(buffer, len);
 }
 
+std::u16string UTF16StringFromFixedZeroTerminatedBuffer(std::u16string_view buffer,
+                                                        std::size_t max_len) {
+    std::size_t len = 0;
+    while (len < max_len && buffer[len] != '\0')
+        ++len;
+
+    return std::u16string(buffer.begin(), buffer.begin() + len);
+}
+
 const char* TrimSourcePath(const char* path, const char* root) {
     const char* p = path;
 

src/common/string_util.h

@@ -66,6 +66,14 @@ bool ComparePartialString(InIt begin, InIt end, const char* other) {
  */
 std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, std::size_t max_len);
 
+/**
+ * Creates a UTF-16 std::u16string from a fixed-size NUL-terminated char buffer. If the buffer isn't
+ * null-terminated, then the string ends at the greatest multiple of two less then or equal to
+ * max_len_bytes.
+ */
+std::u16string UTF16StringFromFixedZeroTerminatedBuffer(std::u16string_view buffer,
+                                                        std::size_t max_len);
+
 /**
  * Attempts to trim an arbitrary prefix from `path`, leaving only the part starting at `root`. It's
  * intended to be used to strip a system-specific build directory from the `__FILE__` macro,

src/core/CMakeLists.txt

@@ -77,6 +77,8 @@ add_library(core STATIC
     file_sys/vfs_vector.h
     file_sys/xts_archive.cpp
     file_sys/xts_archive.h
+    frontend/applets/software_keyboard.cpp
+    frontend/applets/software_keyboard.h
     frontend/emu_window.cpp
     frontend/emu_window.h
     frontend/framebuffer_layout.cpp
@@ -150,6 +152,10 @@ add_library(core STATIC
     hle/service/am/applet_ae.h
     hle/service/am/applet_oe.cpp
     hle/service/am/applet_oe.h
+    hle/service/am/applets/applets.cpp
+    hle/service/am/applets/applets.h
+    hle/service/am/applets/software_keyboard.cpp
+    hle/service/am/applets/software_keyboard.h
     hle/service/am/idle.cpp
     hle/service/am/idle.h
     hle/service/am/omm.cpp

src/core/core.cpp

@@ -23,12 +23,14 @@
 #include "core/hle/kernel/process.h"
 #include "core/hle/kernel/scheduler.h"
 #include "core/hle/kernel/thread.h"
+#include "core/hle/service/am/applets/software_keyboard.h"
 #include "core/hle/service/service.h"
 #include "core/hle/service/sm/sm.h"
 #include "core/loader/loader.h"
 #include "core/perf_stats.h"
 #include "core/settings.h"
 #include "core/telemetry_session.h"
+#include "frontend/applets/software_keyboard.h"
 #include "video_core/debug_utils/debug_utils.h"
 #include "video_core/gpu.h"
 #include "video_core/renderer_base.h"
@@ -136,6 +138,10 @@ struct System::Impl {
         if (virtual_filesystem == nullptr)
             virtual_filesystem = std::make_shared<FileSys::RealVfsFilesystem>();
 
+        /// Create default implementations of applets if one is not provided.
+        if (software_keyboard == nullptr)
+            software_keyboard = std::make_unique<Core::Frontend::DefaultSoftwareKeyboardApplet>();
+
         auto main_process = Kernel::Process::Create(kernel, "main");
         kernel.MakeCurrentProcess(main_process.get());
 
@@ -289,6 +295,9 @@ struct System::Impl {
     std::array<std::unique_ptr<std::thread>, NUM_CPU_CORES - 1> cpu_core_threads;
     std::size_t active_core{}; ///< Active core, only used in single thread mode
 
+    /// Frontend applets
+    std::unique_ptr<Core::Frontend::SoftwareKeyboardApplet> software_keyboard;
+
     /// Service manager
     std::shared_ptr<Service::SM::ServiceManager> service_manager;
 
@@ -488,6 +497,14 @@ std::shared_ptr<FileSys::VfsFilesystem> System::GetFilesystem() const {
     return impl->virtual_filesystem;
 }
 
+void System::SetSoftwareKeyboard(std::unique_ptr<Core::Frontend::SoftwareKeyboardApplet> applet) {
+    impl->software_keyboard = std::move(applet);
+}
+
+const Core::Frontend::SoftwareKeyboardApplet& System::GetSoftwareKeyboard() const {
+    return *impl->software_keyboard;
+}
+
 System::ResultStatus System::Init(Frontend::EmuWindow& emu_window) {
     return impl->Init(emu_window);
 }

src/core/core.h

@@ -13,6 +13,7 @@
 
 namespace Core::Frontend {
 class EmuWindow;
+class SoftwareKeyboardApplet;
 } // namespace Core::Frontend
 
 namespace FileSys {
@@ -236,6 +237,10 @@ public:
 
     std::shared_ptr<FileSys::VfsFilesystem> GetFilesystem() const;
 
+    void SetSoftwareKeyboard(std::unique_ptr<Core::Frontend::SoftwareKeyboardApplet> applet);
+
+    const Core::Frontend::SoftwareKeyboardApplet& GetSoftwareKeyboard() const;
+
 private:
     System();
 

src/core/frontend/applets/software_keyboard.cpp

@@ -0,0 +1,29 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/logging/backend.h"
+#include "common/string_util.h"
+#include "core/frontend/applets/software_keyboard.h"
+
+namespace Core::Frontend {
+SoftwareKeyboardApplet::~SoftwareKeyboardApplet() = default;
+
+void DefaultSoftwareKeyboardApplet::RequestText(
+    std::function<void(std::optional<std::u16string>)> out,
+    SoftwareKeyboardParameters parameters) const {
+    if (parameters.initial_text.empty())
+        out(u"yuzu");
+
+    out(parameters.initial_text);
+}
+
+void DefaultSoftwareKeyboardApplet::SendTextCheckDialog(
+    std::u16string error_message, std::function<void()> finished_check) const {
+    LOG_WARNING(Service_AM,
+                "(STUBBED) called - Default fallback software keyboard does not support text "
+                "check! (error_message={})",
+                Common::UTF16ToUTF8(error_message));
+    finished_check();
+}
+} // namespace Core::Frontend

src/core/frontend/applets/software_keyboard.h

@@ -0,0 +1,54 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <optional>
+#include <string>
+#include "common/bit_field.h"
+#include "common/common_types.h"
+
+namespace Core::Frontend {
+struct SoftwareKeyboardParameters {
+    std::u16string submit_text;
+    std::u16string header_text;
+    std::u16string sub_text;
+    std::u16string guide_text;
+    std::u16string initial_text;
+    std::size_t max_length;
+    bool password;
+    bool cursor_at_beginning;
+
+    union {
+        u8 value;
+
+        BitField<1, 1, u8> disable_space;
+        BitField<2, 1, u8> disable_address;
+        BitField<3, 1, u8> disable_percent;
+        BitField<4, 1, u8> disable_slash;
+        BitField<6, 1, u8> disable_number;
+        BitField<7, 1, u8> disable_download_code;
+    };
+};
+
+class SoftwareKeyboardApplet {
+public:
+    virtual ~SoftwareKeyboardApplet();
+
+    virtual void RequestText(std::function<void(std::optional<std::u16string>)> out,
+                             SoftwareKeyboardParameters parameters) const = 0;
+    virtual void SendTextCheckDialog(std::u16string error_message,
+                                     std::function<void()> finished_check) const = 0;
+};
+
+class DefaultSoftwareKeyboardApplet final : public SoftwareKeyboardApplet {
+public:
+    void RequestText(std::function<void(std::optional<std::u16string>)> out,
+                     SoftwareKeyboardParameters parameters) const override;
+    void SendTextCheckDialog(std::u16string error_message,
+                             std::function<void()> finished_check) const override;
+};
+
+} // namespace Core::Frontend

src/core/hle/kernel/svc.cpp

@@ -1183,9 +1183,39 @@ static ResultCode ResetSignal(Handle handle) {
 
 /// Creates a TransferMemory object
 static ResultCode CreateTransferMemory(Handle* handle, VAddr addr, u64 size, u32 permissions) {
-    LOG_WARNING(Kernel_SVC, "(STUBBED) called addr=0x{:X}, size=0x{:X}, perms=0x{:08X}", addr, size,
+    LOG_DEBUG(Kernel_SVC, "called addr=0x{:X}, size=0x{:X}, perms=0x{:08X}", addr, size,
-                permissions);
+              permissions);
-    *handle = 0;
+
+    if (!Common::Is4KBAligned(addr)) {
+        LOG_ERROR(Kernel_SVC, "Address ({:016X}) is not page aligned!", addr);
+        return ERR_INVALID_ADDRESS;
+    }
+
+    if (!Common::Is4KBAligned(size) || size == 0) {
+        LOG_ERROR(Kernel_SVC, "Size ({:016X}) is not page aligned or equal to zero!", size);
+        return ERR_INVALID_ADDRESS;
+    }
+
+    if (!IsValidAddressRange(addr, size)) {
+        LOG_ERROR(Kernel_SVC, "Address and size cause overflow! (address={:016X}, size={:016X})",
+                  addr, size);
+        return ERR_INVALID_ADDRESS_STATE;
+    }
+
+    const auto perms = static_cast<MemoryPermission>(permissions);
+    if (perms != MemoryPermission::None && perms != MemoryPermission::Read &&
+        perms != MemoryPermission::ReadWrite) {
+        LOG_ERROR(Kernel_SVC, "Invalid memory permissions for transfer memory! (perms={:08X})",
+                  permissions);
+        return ERR_INVALID_MEMORY_PERMISSIONS;
+    }
+
+    auto& kernel = Core::System::GetInstance().Kernel();
+    auto& handle_table = Core::CurrentProcess()->GetHandleTable();
+    const auto shared_mem_handle = SharedMemory::Create(
+        kernel, handle_table.Get<Process>(CurrentProcess), size, perms, perms, addr);
+
+    CASCADE_RESULT(*handle, handle_table.Create(shared_mem_handle));
     return RESULT_SUCCESS;
 }
 

src/core/hle/service/am/am.cpp

@@ -6,10 +6,14 @@
 #include <cinttypes>
 #include <cstring>
 #include <stack>
+#include "applets/applets.h"
+#include "applets/software_keyboard.h"
+#include "audio_core/audio_renderer.h"
 #include "core/core.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/event.h"
 #include "core/hle/kernel/process.h"
+#include "core/hle/kernel/shared_memory.h"
 #include "core/hle/service/acc/profile_manager.h"
 #include "core/hle/service/am/am.h"
 #include "core/hle/service/am/applet_ae.h"
@@ -28,6 +32,13 @@
 
 namespace Service::AM {
 
+constexpr ResultCode ERR_NO_DATA_IN_CHANNEL{ErrorModule::AM, 0x2};
+constexpr ResultCode ERR_SIZE_OUT_OF_BOUNDS{ErrorModule::AM, 0x1F7};
+
+enum class AppletId : u32 {
+    SoftwareKeyboard = 0x11,
+};
+
 constexpr u32 POP_LAUNCH_PARAMETER_MAGIC = 0xC79497CA;
 
 struct LaunchParameters {
@@ -481,6 +492,24 @@ void ICommonStateGetter::GetDefaultDisplayResolution(Kernel::HLERequestContext&
     LOG_DEBUG(Service_AM, "called");
 }
 
+IStorage::IStorage(std::vector<u8> buffer)
+    : ServiceFramework("IStorage"), buffer(std::move(buffer)) {
+    // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, &IStorage::Open, "Open"},
+            {1, nullptr, "OpenTransferStorage"},
+        };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IStorage::~IStorage() = default;
+
+const std::vector<u8>& IStorage::GetData() const {
+    return buffer;
+}
+
 void ICommonStateGetter::GetOperationMode(Kernel::HLERequestContext& ctx) {
     const bool use_docked_mode{Settings::values.use_docked_mode};
     IPC::ResponseBuilder rb{ctx, 3};
@@ -500,100 +529,15 @@ void ICommonStateGetter::GetPerformanceMode(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_AM, "called");
 }
 
-class IStorageAccessor final : public ServiceFramework<IStorageAccessor> {
-public:
-    explicit IStorageAccessor(std::vector<u8> buffer)
-        : ServiceFramework("IStorageAccessor"), buffer(std::move(buffer)) {
-        // clang-format off
-        static const FunctionInfo functions[] = {
-            {0, &IStorageAccessor::GetSize, "GetSize"},
-            {10, &IStorageAccessor::Write, "Write"},
-            {11, &IStorageAccessor::Read, "Read"},
-        };
-        // clang-format on
-
-        RegisterHandlers(functions);
-    }
-
-private:
-    std::vector<u8> buffer;
-
-    void GetSize(Kernel::HLERequestContext& ctx) {
-        IPC::ResponseBuilder rb{ctx, 4};
-
-        rb.Push(RESULT_SUCCESS);
-        rb.Push(static_cast<u64>(buffer.size()));
-
-        LOG_DEBUG(Service_AM, "called");
-    }
-
-    void Write(Kernel::HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-
-        const u64 offset{rp.Pop<u64>()};
-        const std::vector<u8> data{ctx.ReadBuffer()};
-
-        ASSERT(offset + data.size() <= buffer.size());
-
-        std::memcpy(&buffer[offset], data.data(), data.size());
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(RESULT_SUCCESS);
-
-        LOG_DEBUG(Service_AM, "called, offset={}", offset);
-    }
-
-    void Read(Kernel::HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-
-        const u64 offset{rp.Pop<u64>()};
-        const std::size_t size{ctx.GetWriteBufferSize()};
-
-        ASSERT(offset + size <= buffer.size());
-
-        ctx.WriteBuffer(buffer.data() + offset, size);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(RESULT_SUCCESS);
-
-        LOG_DEBUG(Service_AM, "called, offset={}", offset);
-    }
-};
-
-class IStorage final : public ServiceFramework<IStorage> {
-public:
-    explicit IStorage(std::vector<u8> buffer)
-        : ServiceFramework("IStorage"), buffer(std::move(buffer)) {
-        // clang-format off
-        static const FunctionInfo functions[] = {
-            {0, &IStorage::Open, "Open"},
-            {1, nullptr, "OpenTransferStorage"},
-        };
-        // clang-format on
-
-        RegisterHandlers(functions);
-    }
-
-private:
-    std::vector<u8> buffer;
-
-    void Open(Kernel::HLERequestContext& ctx) {
-        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-
-        rb.Push(RESULT_SUCCESS);
-        rb.PushIpcInterface<AM::IStorageAccessor>(buffer);
-
-        LOG_DEBUG(Service_AM, "called");
-    }
-};
-
 class ILibraryAppletAccessor final : public ServiceFramework<ILibraryAppletAccessor> {
 public:
-    explicit ILibraryAppletAccessor() : ServiceFramework("ILibraryAppletAccessor") {
+    explicit ILibraryAppletAccessor(std::shared_ptr<Applets::Applet> applet)
+        : ServiceFramework("ILibraryAppletAccessor"), applet(std::move(applet)),
+          broker(std::make_shared<Applets::AppletDataBroker>()) {
         // clang-format off
         static const FunctionInfo functions[] = {
             {0, &ILibraryAppletAccessor::GetAppletStateChangedEvent, "GetAppletStateChangedEvent"},
-            {1, nullptr, "IsCompleted"},
+            {1, &ILibraryAppletAccessor::IsCompleted, "IsCompleted"},
             {10, &ILibraryAppletAccessor::Start, "Start"},
             {20, nullptr, "RequestExit"},
             {25, nullptr, "Terminate"},
@@ -602,10 +546,10 @@ public:
             {100, &ILibraryAppletAccessor::PushInData, "PushInData"},
             {101, &ILibraryAppletAccessor::PopOutData, "PopOutData"},
             {102, nullptr, "PushExtraStorage"},
-            {103, nullptr, "PushInteractiveInData"},
+            {103, &ILibraryAppletAccessor::PushInteractiveInData, "PushInteractiveInData"},
-            {104, nullptr, "PopInteractiveOutData"},
+            {104, &ILibraryAppletAccessor::PopInteractiveOutData, "PopInteractiveOutData"},
-            {105, nullptr, "GetPopOutDataEvent"},
+            {105, &ILibraryAppletAccessor::GetPopOutDataEvent, "GetPopOutDataEvent"},
-            {106, nullptr, "GetPopInteractiveOutDataEvent"},
+            {106, &ILibraryAppletAccessor::GetPopInteractiveOutDataEvent, "GetPopInteractiveOutDataEvent"},
             {110, nullptr, "NeedsToExitProcess"},
             {120, nullptr, "GetLibraryAppletInfo"},
             {150, nullptr, "RequestForAppletToGetForeground"},
@@ -614,40 +558,50 @@ public:
         // clang-format on
 
         RegisterHandlers(functions);
-
-        auto& kernel = Core::System::GetInstance().Kernel();
-        state_changed_event = Kernel::Event::Create(kernel, Kernel::ResetType::OneShot,
-                                                    "ILibraryAppletAccessor:StateChangedEvent");
     }
 
 private:
     void GetAppletStateChangedEvent(Kernel::HLERequestContext& ctx) {
-        state_changed_event->Signal();
+        const auto event = broker->GetStateChangedEvent();
+        event->Signal();
 
         IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
-        rb.PushCopyObjects(state_changed_event);
+        rb.PushCopyObjects(event);
 
-        LOG_WARNING(Service_AM, "(STUBBED) called");
+        LOG_DEBUG(Service_AM, "called");
+    }
+
+    void IsCompleted(Kernel::HLERequestContext& ctx) {
+        IPC::ResponseBuilder rb{ctx, 3};
+        rb.Push(RESULT_SUCCESS);
+        rb.Push<u32>(applet->TransactionComplete());
+
+        LOG_DEBUG(Service_AM, "called");
     }
 
     void GetResult(Kernel::HLERequestContext& ctx) {
         IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(RESULT_SUCCESS);
+        rb.Push(applet->GetStatus());
 
-        LOG_WARNING(Service_AM, "(STUBBED) called");
+        LOG_DEBUG(Service_AM, "called");
     }
 
     void Start(Kernel::HLERequestContext& ctx) {
+        ASSERT(applet != nullptr);
+
+        applet->Initialize(broker);
+        applet->Execute();
+
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
-        LOG_WARNING(Service_AM, "(STUBBED) called");
+        LOG_DEBUG(Service_AM, "called");
     }
 
     void PushInData(Kernel::HLERequestContext& ctx) {
         IPC::RequestParser rp{ctx};
-        storage_stack.push(rp.PopIpcInterface<AM::IStorage>());
+        broker->PushNormalDataFromGame(*rp.PopIpcInterface<IStorage>());
 
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
@@ -657,25 +611,146 @@ private:
 
     void PopOutData(Kernel::HLERequestContext& ctx) {
         IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-        rb.Push(RESULT_SUCCESS);
-        rb.PushIpcInterface<AM::IStorage>(std::move(storage_stack.top()));
 
-        storage_stack.pop();
+        const auto storage = broker->PopNormalDataToGame();
+        if (storage == nullptr) {
+            rb.Push(ERR_NO_DATA_IN_CHANNEL);
+            return;
+        }
+
+        rb.Push(RESULT_SUCCESS);
+        rb.PushIpcInterface<IStorage>(std::move(*storage));
 
         LOG_DEBUG(Service_AM, "called");
     }
 
-    std::stack<std::shared_ptr<AM::IStorage>> storage_stack;
+    void PushInteractiveInData(Kernel::HLERequestContext& ctx) {
-    Kernel::SharedPtr<Kernel::Event> state_changed_event;
+        IPC::RequestParser rp{ctx};
+        broker->PushInteractiveDataFromGame(*rp.PopIpcInterface<IStorage>());
+
+        ASSERT(applet->IsInitialized());
+        applet->ExecuteInteractive();
+        applet->Execute();
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(RESULT_SUCCESS);
+
+        LOG_DEBUG(Service_AM, "called");
+    }
+
+    void PopInteractiveOutData(Kernel::HLERequestContext& ctx) {
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+
+        const auto storage = broker->PopInteractiveDataToGame();
+        if (storage == nullptr) {
+            rb.Push(ERR_NO_DATA_IN_CHANNEL);
+            return;
+        }
+
+        rb.Push(RESULT_SUCCESS);
+        rb.PushIpcInterface<IStorage>(std::move(*storage));
+
+        LOG_DEBUG(Service_AM, "called");
+    }
+
+    void GetPopOutDataEvent(Kernel::HLERequestContext& ctx) {
+        IPC::ResponseBuilder rb{ctx, 2, 1};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushCopyObjects(broker->GetNormalDataEvent());
+
+        LOG_DEBUG(Service_AM, "called");
+    }
+
+    void GetPopInteractiveOutDataEvent(Kernel::HLERequestContext& ctx) {
+        IPC::ResponseBuilder rb{ctx, 2, 1};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushCopyObjects(broker->GetInteractiveDataEvent());
+
+        LOG_DEBUG(Service_AM, "called");
+    }
+
+    std::shared_ptr<Applets::Applet> applet;
+    std::shared_ptr<Applets::AppletDataBroker> broker;
 };
 
+void IStorage::Open(Kernel::HLERequestContext& ctx) {
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+
+    rb.Push(RESULT_SUCCESS);
+    rb.PushIpcInterface<IStorageAccessor>(*this);
+
+    LOG_DEBUG(Service_AM, "called");
+}
+
+IStorageAccessor::IStorageAccessor(IStorage& storage)
+    : ServiceFramework("IStorageAccessor"), backing(storage) {
+    // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, &IStorageAccessor::GetSize, "GetSize"},
+            {10, &IStorageAccessor::Write, "Write"},
+            {11, &IStorageAccessor::Read, "Read"},
+        };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IStorageAccessor::~IStorageAccessor() = default;
+
+void IStorageAccessor::GetSize(Kernel::HLERequestContext& ctx) {
+    IPC::ResponseBuilder rb{ctx, 4};
+
+    rb.Push(RESULT_SUCCESS);
+    rb.Push(static_cast<u64>(backing.buffer.size()));
+
+    LOG_DEBUG(Service_AM, "called");
+}
+
+void IStorageAccessor::Write(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const u64 offset{rp.Pop<u64>()};
+    const std::vector<u8> data{ctx.ReadBuffer()};
+
+    if (data.size() > backing.buffer.size() - offset) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ERR_SIZE_OUT_OF_BOUNDS);
+    }
+
+    std::memcpy(backing.buffer.data() + offset, data.data(), data.size());
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+
+    LOG_DEBUG(Service_AM, "called, offset={}", offset);
+}
+
+void IStorageAccessor::Read(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const u64 offset{rp.Pop<u64>()};
+    const std::size_t size{ctx.GetWriteBufferSize()};
+
+    if (size > backing.buffer.size() - offset) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ERR_SIZE_OUT_OF_BOUNDS);
+    }
+
+    ctx.WriteBuffer(backing.buffer.data() + offset, size);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+
+    LOG_DEBUG(Service_AM, "called, offset={}", offset);
+}
+
 ILibraryAppletCreator::ILibraryAppletCreator() : ServiceFramework("ILibraryAppletCreator") {
     static const FunctionInfo functions[] = {
         {0, &ILibraryAppletCreator::CreateLibraryApplet, "CreateLibraryApplet"},
         {1, nullptr, "TerminateAllLibraryApplets"},
         {2, nullptr, "AreAnyLibraryAppletsLeft"},
         {10, &ILibraryAppletCreator::CreateStorage, "CreateStorage"},
-        {11, nullptr, "CreateTransferMemoryStorage"},
+        {11, &ILibraryAppletCreator::CreateTransferMemoryStorage, "CreateTransferMemoryStorage"},
         {12, nullptr, "CreateHandleStorage"},
     };
     RegisterHandlers(functions);
@@ -683,11 +758,36 @@ ILibraryAppletCreator::ILibraryAppletCreator() : ServiceFramework("ILibraryApple
 
 ILibraryAppletCreator::~ILibraryAppletCreator() = default;
 
+static std::shared_ptr<Applets::Applet> GetAppletFromId(AppletId id) {
+    switch (id) {
+    case AppletId::SoftwareKeyboard:
+        return std::make_shared<Applets::SoftwareKeyboard>();
+    default:
+        UNREACHABLE_MSG("Unimplemented AppletId [{:08X}]!", static_cast<u32>(id));
+        return nullptr;
+    }
+}
+
 void ILibraryAppletCreator::CreateLibraryApplet(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto applet_id = rp.PopRaw<AppletId>();
+    const auto applet_mode = rp.PopRaw<u32>();
+
+    LOG_DEBUG(Service_AM, "called with applet_id={:08X}, applet_mode={:08X}",
+              static_cast<u32>(applet_id), applet_mode);
+
+    const auto applet = GetAppletFromId(applet_id);
+
+    if (applet == nullptr) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultCode(-1));
+        return;
+    }
+
     IPC::ResponseBuilder rb{ctx, 2, 0, 1};
 
     rb.Push(RESULT_SUCCESS);
-    rb.PushIpcInterface<AM::ILibraryAppletAccessor>();
+    rb.PushIpcInterface<AM::ILibraryAppletAccessor>(applet);
 
     LOG_DEBUG(Service_AM, "called");
 }
@@ -704,6 +804,31 @@ void ILibraryAppletCreator::CreateStorage(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_AM, "called, size={}", size);
 }
 
+void ILibraryAppletCreator::CreateTransferMemoryStorage(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    rp.SetCurrentOffset(3);
+    const auto handle{rp.Pop<Kernel::Handle>()};
+
+    const auto shared_mem =
+        Core::System::GetInstance().CurrentProcess()->GetHandleTable().Get<Kernel::SharedMemory>(
+            handle);
+
+    if (shared_mem == nullptr) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultCode(-1));
+        return;
+    }
+
+    const auto mem_begin = shared_mem->backing_block->begin() + shared_mem->backing_block_offset;
+    const auto mem_end = mem_begin + shared_mem->size;
+    std::vector<u8> memory{mem_begin, mem_end};
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(RESULT_SUCCESS);
+    rb.PushIpcInterface(std::make_shared<IStorage>(std::move(memory)));
+}
+
 IApplicationFunctions::IApplicationFunctions() : ServiceFramework("IApplicationFunctions") {
     // clang-format off
     static const FunctionInfo functions[] = {

src/core/hle/service/am/am.h

@@ -155,6 +155,34 @@ private:
     std::shared_ptr<AppletMessageQueue> msg_queue;
 };
 
+class IStorage final : public ServiceFramework<IStorage> {
+public:
+    explicit IStorage(std::vector<u8> buffer);
+    ~IStorage() override;
+
+    const std::vector<u8>& GetData() const;
+
+private:
+    void Open(Kernel::HLERequestContext& ctx);
+
+    std::vector<u8> buffer;
+
+    friend class IStorageAccessor;
+};
+
+class IStorageAccessor final : public ServiceFramework<IStorageAccessor> {
+public:
+    explicit IStorageAccessor(IStorage& backing);
+    ~IStorageAccessor() override;
+
+private:
+    void GetSize(Kernel::HLERequestContext& ctx);
+    void Write(Kernel::HLERequestContext& ctx);
+    void Read(Kernel::HLERequestContext& ctx);
+
+    IStorage& backing;
+};
+
 class ILibraryAppletCreator final : public ServiceFramework<ILibraryAppletCreator> {
 public:
     ILibraryAppletCreator();
@@ -163,6 +191,7 @@ public:
 private:
     void CreateLibraryApplet(Kernel::HLERequestContext& ctx);
     void CreateStorage(Kernel::HLERequestContext& ctx);
+    void CreateTransferMemoryStorage(Kernel::HLERequestContext& ctx);
 };
 
 class IApplicationFunctions final : public ServiceFramework<IApplicationFunctions> {

src/core/hle/service/am/applets/applets.cpp

@@ -0,0 +1,115 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cstring>
+#include "common/assert.h"
+#include "core/core.h"
+#include "core/hle/kernel/event.h"
+#include "core/hle/kernel/server_port.h"
+#include "core/hle/service/am/am.h"
+#include "core/hle/service/am/applets/applets.h"
+
+namespace Service::AM::Applets {
+
+AppletDataBroker::AppletDataBroker() {
+    auto& kernel = Core::System::GetInstance().Kernel();
+    state_changed_event = Kernel::Event::Create(kernel, Kernel::ResetType::OneShot,
+                                                "ILibraryAppletAccessor:StateChangedEvent");
+    pop_out_data_event = Kernel::Event::Create(kernel, Kernel::ResetType::OneShot,
+                                               "ILibraryAppletAccessor:PopDataOutEvent");
+    pop_interactive_out_data_event = Kernel::Event::Create(
+        kernel, Kernel::ResetType::OneShot, "ILibraryAppletAccessor:PopInteractiveDataOutEvent");
+}
+
+AppletDataBroker::~AppletDataBroker() = default;
+
+std::unique_ptr<IStorage> AppletDataBroker::PopNormalDataToGame() {
+    if (out_channel.empty())
+        return nullptr;
+
+    auto out = std::move(out_channel.front());
+    out_channel.pop();
+    return out;
+}
+
+std::unique_ptr<IStorage> AppletDataBroker::PopNormalDataToApplet() {
+    if (in_channel.empty())
+        return nullptr;
+
+    auto out = std::move(in_channel.front());
+    in_channel.pop();
+    return out;
+}
+
+std::unique_ptr<IStorage> AppletDataBroker::PopInteractiveDataToGame() {
+    if (out_interactive_channel.empty())
+        return nullptr;
+
+    auto out = std::move(out_interactive_channel.front());
+    out_interactive_channel.pop();
+    return out;
+}
+
+std::unique_ptr<IStorage> AppletDataBroker::PopInteractiveDataToApplet() {
+    if (in_interactive_channel.empty())
+        return nullptr;
+
+    auto out = std::move(in_interactive_channel.front());
+    in_interactive_channel.pop();
+    return out;
+}
+
+void AppletDataBroker::PushNormalDataFromGame(IStorage storage) {
+    in_channel.push(std::make_unique<IStorage>(storage));
+}
+
+void AppletDataBroker::PushNormalDataFromApplet(IStorage storage) {
+    out_channel.push(std::make_unique<IStorage>(storage));
+    pop_out_data_event->Signal();
+}
+
+void AppletDataBroker::PushInteractiveDataFromGame(IStorage storage) {
+    in_interactive_channel.push(std::make_unique<IStorage>(storage));
+}
+
+void AppletDataBroker::PushInteractiveDataFromApplet(IStorage storage) {
+    out_interactive_channel.push(std::make_unique<IStorage>(storage));
+    pop_interactive_out_data_event->Signal();
+}
+
+void AppletDataBroker::SignalStateChanged() const {
+    state_changed_event->Signal();
+}
+
+Kernel::SharedPtr<Kernel::Event> AppletDataBroker::GetNormalDataEvent() const {
+    return pop_out_data_event;
+}
+
+Kernel::SharedPtr<Kernel::Event> AppletDataBroker::GetInteractiveDataEvent() const {
+    return pop_interactive_out_data_event;
+}
+
+Kernel::SharedPtr<Kernel::Event> AppletDataBroker::GetStateChangedEvent() const {
+    return state_changed_event;
+}
+
+Applet::Applet() = default;
+
+Applet::~Applet() = default;
+
+void Applet::Initialize(std::shared_ptr<AppletDataBroker> broker_) {
+    broker = std::move(broker_);
+
+    const auto common = broker->PopNormalDataToApplet();
+    ASSERT(common != nullptr);
+
+    const auto common_data = common->GetData();
+
+    ASSERT(common_data.size() >= sizeof(CommonArguments));
+    std::memcpy(&common_args, common_data.data(), sizeof(CommonArguments));
+
+    initialized = true;
+}
+
+} // namespace Service::AM::Applets

src/core/hle/service/am/applets/applets.h

@@ -0,0 +1,94 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <queue>
+#include "common/swap.h"
+#include "core/hle/kernel/event.h"
+
+union ResultCode;
+
+namespace Service::AM {
+
+class IStorage;
+
+namespace Applets {
+
+class AppletDataBroker final {
+public:
+    AppletDataBroker();
+    ~AppletDataBroker();
+
+    std::unique_ptr<IStorage> PopNormalDataToGame();
+    std::unique_ptr<IStorage> PopNormalDataToApplet();
+
+    std::unique_ptr<IStorage> PopInteractiveDataToGame();
+    std::unique_ptr<IStorage> PopInteractiveDataToApplet();
+
+    void PushNormalDataFromGame(IStorage storage);
+    void PushNormalDataFromApplet(IStorage storage);
+
+    void PushInteractiveDataFromGame(IStorage storage);
+    void PushInteractiveDataFromApplet(IStorage storage);
+
+    void SignalStateChanged() const;
+
+    Kernel::SharedPtr<Kernel::Event> GetNormalDataEvent() const;
+    Kernel::SharedPtr<Kernel::Event> GetInteractiveDataEvent() const;
+    Kernel::SharedPtr<Kernel::Event> GetStateChangedEvent() const;
+
+private:
+    // Queues are named from applet's perspective
+    std::queue<std::unique_ptr<IStorage>>
+        in_channel; // PopNormalDataToApplet and PushNormalDataFromGame
+    std::queue<std::unique_ptr<IStorage>>
+        out_channel; // PopNormalDataToGame and PushNormalDataFromApplet
+    std::queue<std::unique_ptr<IStorage>>
+        in_interactive_channel; // PopInteractiveDataToApplet and PushInteractiveDataFromGame
+    std::queue<std::unique_ptr<IStorage>>
+        out_interactive_channel; // PopInteractiveDataToGame and PushInteractiveDataFromApplet
+
+    Kernel::SharedPtr<Kernel::Event> state_changed_event;
+    Kernel::SharedPtr<Kernel::Event> pop_out_data_event; // Signaled on PushNormalDataFromApplet
+    Kernel::SharedPtr<Kernel::Event>
+        pop_interactive_out_data_event; // Signaled on PushInteractiveDataFromApplet
+};
+
+class Applet {
+public:
+    Applet();
+    virtual ~Applet();
+
+    virtual void Initialize(std::shared_ptr<AppletDataBroker> broker);
+
+    virtual bool TransactionComplete() const = 0;
+    virtual ResultCode GetStatus() const = 0;
+    virtual void ExecuteInteractive() = 0;
+    virtual void Execute() = 0;
+
+    bool IsInitialized() const {
+        return initialized;
+    }
+
+protected:
+    struct CommonArguments {
+        u32_le arguments_version;
+        u32_le size;
+        u32_le library_version;
+        u32_le theme_color;
+        u8 play_startup_sound;
+        u64_le system_tick;
+    };
+    static_assert(sizeof(CommonArguments) == 0x20, "CommonArguments has incorrect size.");
+
+    CommonArguments common_args;
+    std::shared_ptr<AppletDataBroker> broker;
+    bool initialized = false;
+};
+
+} // namespace Applets
+} // namespace Service::AM

src/core/hle/service/am/applets/software_keyboard.cpp

@@ -0,0 +1,161 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cstring>
+#include "common/assert.h"
+#include "common/string_util.h"
+#include "core/core.h"
+#include "core/frontend/applets/software_keyboard.h"
+#include "core/hle/service/am/am.h"
+#include "core/hle/service/am/applets/software_keyboard.h"
+
+namespace Service::AM::Applets {
+
+constexpr std::size_t SWKBD_OUTPUT_BUFFER_SIZE = 0x7D8;
+constexpr std::size_t SWKBD_OUTPUT_INTERACTIVE_BUFFER_SIZE = 0x7D4;
+constexpr std::size_t DEFAULT_MAX_LENGTH = 500;
+constexpr bool INTERACTIVE_STATUS_OK = false;
+
+static Core::Frontend::SoftwareKeyboardParameters ConvertToFrontendParameters(
+    KeyboardConfig config, std::u16string initial_text) {
+    Core::Frontend::SoftwareKeyboardParameters params{};
+
+    params.submit_text = Common::UTF16StringFromFixedZeroTerminatedBuffer(
+        config.submit_text.data(), config.submit_text.size());
+    params.header_text = Common::UTF16StringFromFixedZeroTerminatedBuffer(
+        config.header_text.data(), config.header_text.size());
+    params.sub_text = Common::UTF16StringFromFixedZeroTerminatedBuffer(config.sub_text.data(),
+                                                                       config.sub_text.size());
+    params.guide_text = Common::UTF16StringFromFixedZeroTerminatedBuffer(config.guide_text.data(),
+                                                                         config.guide_text.size());
+    params.initial_text = initial_text;
+    params.max_length = config.length_limit == 0 ? DEFAULT_MAX_LENGTH : config.length_limit;
+    params.password = static_cast<bool>(config.is_password);
+    params.cursor_at_beginning = static_cast<bool>(config.initial_cursor_position);
+    params.value = static_cast<u8>(config.keyset_disable_bitmask);
+
+    return params;
+}
+
+SoftwareKeyboard::SoftwareKeyboard() = default;
+
+SoftwareKeyboard::~SoftwareKeyboard() = default;
+
+void SoftwareKeyboard::Initialize(std::shared_ptr<AppletDataBroker> broker_) {
+    complete = false;
+    initial_text.clear();
+    final_data.clear();
+
+    Applet::Initialize(std::move(broker_));
+
+    const auto keyboard_config_storage = broker->PopNormalDataToApplet();
+    ASSERT(keyboard_config_storage != nullptr);
+    const auto& keyboard_config = keyboard_config_storage->GetData();
+
+    ASSERT(keyboard_config.size() >= sizeof(KeyboardConfig));
+    std::memcpy(&config, keyboard_config.data(), sizeof(KeyboardConfig));
+
+    const auto work_buffer_storage = broker->PopNormalDataToApplet();
+    ASSERT(work_buffer_storage != nullptr);
+    const auto& work_buffer = work_buffer_storage->GetData();
+
+    if (config.initial_string_size == 0)
+        return;
+
+    std::vector<char16_t> string(config.initial_string_size);
+    std::memcpy(string.data(), work_buffer.data() + config.initial_string_offset,
+                string.size() * 2);
+    initial_text = Common::UTF16StringFromFixedZeroTerminatedBuffer(string.data(), string.size());
+}
+
+bool SoftwareKeyboard::TransactionComplete() const {
+    return complete;
+}
+
+ResultCode SoftwareKeyboard::GetStatus() const {
+    return RESULT_SUCCESS;
+}
+
+void SoftwareKeyboard::ExecuteInteractive() {
+    if (complete)
+        return;
+
+    const auto storage = broker->PopInteractiveDataToApplet();
+    ASSERT(storage != nullptr);
+    const auto data = storage->GetData();
+    const auto status = static_cast<bool>(data[0]);
+
+    if (status == INTERACTIVE_STATUS_OK) {
+        complete = true;
+    } else {
+        const auto& frontend{Core::System::GetInstance().GetSoftwareKeyboard()};
+
+        std::array<char16_t, SWKBD_OUTPUT_INTERACTIVE_BUFFER_SIZE / 2 - 2> string;
+        std::memcpy(string.data(), data.data() + 4, string.size() * 2);
+        frontend.SendTextCheckDialog(
+            Common::UTF16StringFromFixedZeroTerminatedBuffer(string.data(), string.size()),
+            [this] { broker->SignalStateChanged(); });
+    }
+}
+
+void SoftwareKeyboard::Execute() {
+    if (complete) {
+        broker->PushNormalDataFromApplet(IStorage{final_data});
+        return;
+    }
+
+    const auto& frontend{Core::System::GetInstance().GetSoftwareKeyboard()};
+
+    const auto parameters = ConvertToFrontendParameters(config, initial_text);
+
+    frontend.RequestText([this](std::optional<std::u16string> text) { WriteText(text); },
+                         parameters);
+}
+
+void SoftwareKeyboard::WriteText(std::optional<std::u16string> text) {
+    std::vector<u8> output_main(SWKBD_OUTPUT_BUFFER_SIZE);
+
+    if (text.has_value()) {
+        std::vector<u8> output_sub(SWKBD_OUTPUT_BUFFER_SIZE);
+
+        if (config.utf_8) {
+            const u64 size = text->size() + 8;
+            const auto new_text = Common::UTF16ToUTF8(*text);
+
+            std::memcpy(output_sub.data(), &size, sizeof(u64));
+            std::memcpy(output_sub.data() + 8, new_text.data(),
+                        std::min(new_text.size(), SWKBD_OUTPUT_BUFFER_SIZE - 8));
+
+            output_main[0] = INTERACTIVE_STATUS_OK;
+            std::memcpy(output_main.data() + 4, new_text.data(),
+                        std::min(new_text.size(), SWKBD_OUTPUT_BUFFER_SIZE - 4));
+        } else {
+            const u64 size = text->size() * 2 + 8;
+            std::memcpy(output_sub.data(), &size, sizeof(u64));
+            std::memcpy(output_sub.data() + 8, text->data(),
+                        std::min(text->size() * 2, SWKBD_OUTPUT_BUFFER_SIZE - 8));
+
+            output_main[0] = INTERACTIVE_STATUS_OK;
+            std::memcpy(output_main.data() + 4, text->data(),
+                        std::min(text->size() * 2, SWKBD_OUTPUT_BUFFER_SIZE - 4));
+        }
+
+        complete = !config.text_check;
+        final_data = output_main;
+
+        if (complete) {
+            broker->PushNormalDataFromApplet(IStorage{output_main});
+        } else {
+            broker->PushInteractiveDataFromApplet(IStorage{output_sub});
+        }
+
+        broker->SignalStateChanged();
+    } else {
+        output_main[0] = 1;
+        complete = true;
+        broker->PushNormalDataFromApplet(IStorage{output_main});
+        broker->SignalStateChanged();
+    }
+}
+} // namespace Service::AM::Applets

src/core/hle/service/am/applets/software_keyboard.h

@@ -0,0 +1,69 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_funcs.h"
+#include "core/hle/service/am/am.h"
+#include "core/hle/service/am/applets/applets.h"
+
+namespace Service::AM::Applets {
+
+enum class KeysetDisable : u32 {
+    Space = 0x02,
+    Address = 0x04,
+    Percent = 0x08,
+    Slashes = 0x10,
+    Numbers = 0x40,
+    DownloadCode = 0x80,
+};
+
+struct KeyboardConfig {
+    INSERT_PADDING_BYTES(4);
+    std::array<char16_t, 9> submit_text;
+    u16_le left_symbol_key;
+    u16_le right_symbol_key;
+    INSERT_PADDING_BYTES(1);
+    KeysetDisable keyset_disable_bitmask;
+    u32_le initial_cursor_position;
+    std::array<char16_t, 65> header_text;
+    std::array<char16_t, 129> sub_text;
+    std::array<char16_t, 257> guide_text;
+    u32_le length_limit;
+    INSERT_PADDING_BYTES(4);
+    u32_le is_password;
+    INSERT_PADDING_BYTES(5);
+    bool utf_8;
+    bool draw_background;
+    u32_le initial_string_offset;
+    u32_le initial_string_size;
+    u32_le user_dictionary_offset;
+    u32_le user_dictionary_size;
+    bool text_check;
+    u64_le text_check_callback;
+};
+static_assert(sizeof(KeyboardConfig) == 0x3E0, "KeyboardConfig has incorrect size.");
+
+class SoftwareKeyboard final : public Applet {
+public:
+    SoftwareKeyboard();
+    ~SoftwareKeyboard() override;
+
+    void Initialize(std::shared_ptr<AppletDataBroker> broker) override;
+
+    bool TransactionComplete() const override;
+    ResultCode GetStatus() const override;
+    void ExecuteInteractive() override;
+    void Execute() override;
+
+    void WriteText(std::optional<std::u16string> text);
+
+private:
+    KeyboardConfig config;
+    std::u16string initial_text;
+    bool complete = false;
+    std::vector<u8> final_data;
+};
+
+} // namespace Service::AM::Applets

src/yuzu/CMakeLists.txt

@@ -7,6 +7,8 @@ add_executable(yuzu
     Info.plist
     about_dialog.cpp
     about_dialog.h
+    applets/software_keyboard.cpp
+    applets/software_keyboard.h
     bootmanager.cpp
     bootmanager.h
     compatibility_list.cpp

src/yuzu/applets/software_keyboard.cpp

@@ -0,0 +1,152 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <mutex>
+#include <QDialogButtonBox>
+#include <QFont>
+#include <QLabel>
+#include <QLineEdit>
+#include <QVBoxLayout>
+#include "core/hle/lock.h"
+#include "yuzu/applets/software_keyboard.h"
+#include "yuzu/main.h"
+
+QtSoftwareKeyboardValidator::QtSoftwareKeyboardValidator(
+    Core::Frontend::SoftwareKeyboardParameters parameters)
+    : parameters(std::move(parameters)) {}
+
+QValidator::State QtSoftwareKeyboardValidator::validate(QString& input, int& pos) const {
+    if (input.size() > parameters.max_length)
+        return Invalid;
+    if (parameters.disable_space && input.contains(' '))
+        return Invalid;
+    if (parameters.disable_address && input.contains('@'))
+        return Invalid;
+    if (parameters.disable_percent && input.contains('%'))
+        return Invalid;
+    if (parameters.disable_slash && (input.contains('/') || input.contains('\\')))
+        return Invalid;
+    if (parameters.disable_number &&
+        std::any_of(input.begin(), input.end(), [](QChar c) { return c.isDigit(); })) {
+        return Invalid;
+    }
+
+    if (parameters.disable_download_code &&
+        std::any_of(input.begin(), input.end(), [](QChar c) { return c == 'O' || c == 'I'; })) {
+        return Invalid;
+    }
+
+    return Acceptable;
+}
+
+QtSoftwareKeyboardDialog::QtSoftwareKeyboardDialog(
+    QWidget* parent, Core::Frontend::SoftwareKeyboardParameters parameters_)
+    : QDialog(parent), parameters(std::move(parameters_)) {
+    layout = new QVBoxLayout;
+
+    header_label = new QLabel(QString::fromStdU16String(parameters.header_text));
+    header_label->setFont({header_label->font().family(), 11, QFont::Bold});
+    if (header_label->text().isEmpty())
+        header_label->setText(tr("Enter text:"));
+
+    sub_label = new QLabel(QString::fromStdU16String(parameters.sub_text));
+    sub_label->setFont({sub_label->font().family(), sub_label->font().pointSize(),
+                        sub_label->font().weight(), true});
+    sub_label->setHidden(parameters.sub_text.empty());
+
+    guide_label = new QLabel(QString::fromStdU16String(parameters.guide_text));
+    guide_label->setHidden(parameters.guide_text.empty());
+
+    length_label = new QLabel(QStringLiteral("0/%1").arg(parameters.max_length));
+    length_label->setAlignment(Qt::AlignRight);
+    length_label->setFont({length_label->font().family(), 8});
+
+    line_edit = new QLineEdit;
+    line_edit->setValidator(new QtSoftwareKeyboardValidator(parameters));
+    line_edit->setMaxLength(static_cast<int>(parameters.max_length));
+    line_edit->setText(QString::fromStdU16String(parameters.initial_text));
+    line_edit->setCursorPosition(
+        parameters.cursor_at_beginning ? 0 : static_cast<int>(parameters.initial_text.size()));
+    line_edit->setEchoMode(parameters.password ? QLineEdit::Password : QLineEdit::Normal);
+
+    connect(line_edit, &QLineEdit::textChanged, this, [this](const QString& text) {
+        length_label->setText(QStringLiteral("%1/%2").arg(text.size()).arg(parameters.max_length));
+    });
+
+    buttons = new QDialogButtonBox;
+    buttons->addButton(tr("Cancel"), QDialogButtonBox::RejectRole);
+    buttons->addButton(parameters.submit_text.empty()
+                           ? tr("OK")
+                           : QString::fromStdU16String(parameters.submit_text),
+                       QDialogButtonBox::AcceptRole);
+
+    connect(buttons, &QDialogButtonBox::accepted, this, &QtSoftwareKeyboardDialog::Submit);
+    connect(buttons, &QDialogButtonBox::rejected, this, &QtSoftwareKeyboardDialog::Reject);
+    layout->addWidget(header_label);
+    layout->addWidget(sub_label);
+    layout->addWidget(guide_label);
+    layout->addWidget(length_label);
+    layout->addWidget(line_edit);
+    layout->addWidget(buttons);
+    setLayout(layout);
+    setWindowTitle(tr("Software Keyboard"));
+}
+
+QtSoftwareKeyboardDialog::~QtSoftwareKeyboardDialog() = default;
+
+void QtSoftwareKeyboardDialog::Submit() {
+    ok = true;
+    text = line_edit->text().toStdU16String();
+    accept();
+}
+
+void QtSoftwareKeyboardDialog::Reject() {
+    ok = false;
+    text.clear();
+    accept();
+}
+
+std::u16string QtSoftwareKeyboardDialog::GetText() const {
+    return text;
+}
+
+bool QtSoftwareKeyboardDialog::GetStatus() const {
+    return ok;
+}
+
+QtSoftwareKeyboard::QtSoftwareKeyboard(GMainWindow& main_window) {
+    connect(this, &QtSoftwareKeyboard::MainWindowGetText, &main_window,
+            &GMainWindow::SoftwareKeyboardGetText, Qt::QueuedConnection);
+    connect(this, &QtSoftwareKeyboard::MainWindowTextCheckDialog, &main_window,
+            &GMainWindow::SoftwareKeyboardInvokeCheckDialog, Qt::BlockingQueuedConnection);
+    connect(&main_window, &GMainWindow::SoftwareKeyboardFinishedText, this,
+            &QtSoftwareKeyboard::MainWindowFinishedText, Qt::QueuedConnection);
+}
+
+QtSoftwareKeyboard::~QtSoftwareKeyboard() = default;
+
+void QtSoftwareKeyboard::RequestText(std::function<void(std::optional<std::u16string>)> out,
+                                     Core::Frontend::SoftwareKeyboardParameters parameters) const {
+    text_output = out;
+    emit MainWindowGetText(parameters);
+}
+
+void QtSoftwareKeyboard::SendTextCheckDialog(std::u16string error_message,
+                                             std::function<void()> finished_check) const {
+    this->finished_check = finished_check;
+    emit MainWindowTextCheckDialog(error_message);
+}
+
+void QtSoftwareKeyboard::MainWindowFinishedText(std::optional<std::u16string> text) {
+    // Acquire the HLE mutex
+    std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
+    text_output(text);
+}
+
+void QtSoftwareKeyboard::MainWindowFinishedCheckDialog() {
+    // Acquire the HLE mutex
+    std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
+    finished_check();
+}

src/yuzu/applets/software_keyboard.h

@@ -0,0 +1,80 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QDialog>
+#include <QValidator>
+#include "common/assert.h"
+#include "core/frontend/applets/software_keyboard.h"
+
+class GMainWindow;
+class QDialogButtonBox;
+class QLabel;
+class QLineEdit;
+class QVBoxLayout;
+class QtSoftwareKeyboard;
+
+class QtSoftwareKeyboardValidator final : public QValidator {
+public:
+    explicit QtSoftwareKeyboardValidator(Core::Frontend::SoftwareKeyboardParameters parameters);
+    State validate(QString& input, int& pos) const override;
+
+private:
+    Core::Frontend::SoftwareKeyboardParameters parameters;
+};
+
+class QtSoftwareKeyboardDialog final : public QDialog {
+    Q_OBJECT
+
+public:
+    QtSoftwareKeyboardDialog(QWidget* parent,
+                             Core::Frontend::SoftwareKeyboardParameters parameters);
+    ~QtSoftwareKeyboardDialog() override;
+
+    void Submit();
+    void Reject();
+
+    std::u16string GetText() const;
+    bool GetStatus() const;
+
+private:
+    bool ok = false;
+    std::u16string text;
+
+    QDialogButtonBox* buttons;
+    QLabel* header_label;
+    QLabel* sub_label;
+    QLabel* guide_label;
+    QLabel* length_label;
+    QLineEdit* line_edit;
+    QVBoxLayout* layout;
+
+    Core::Frontend::SoftwareKeyboardParameters parameters;
+};
+
+class QtSoftwareKeyboard final : public QObject, public Core::Frontend::SoftwareKeyboardApplet {
+    Q_OBJECT
+
+public:
+    explicit QtSoftwareKeyboard(GMainWindow& parent);
+    ~QtSoftwareKeyboard() override;
+
+    void RequestText(std::function<void(std::optional<std::u16string>)> out,
+                     Core::Frontend::SoftwareKeyboardParameters parameters) const override;
+    void SendTextCheckDialog(std::u16string error_message,
+                             std::function<void()> finished_check) const override;
+
+signals:
+    void MainWindowGetText(Core::Frontend::SoftwareKeyboardParameters parameters) const;
+    void MainWindowTextCheckDialog(std::u16string error_message) const;
+
+public slots:
+    void MainWindowFinishedText(std::optional<std::u16string> text);
+    void MainWindowFinishedCheckDialog();
+
+private:
+    mutable std::function<void(std::optional<std::u16string>)> text_output;
+    mutable std::function<void()> finished_check;
+};

src/yuzu/main.cpp

@@ -8,9 +8,11 @@
 #include <thread>
 
 // VFS includes must be before glad as they will conflict with Windows file api, which uses defines.
+#include "applets/software_keyboard.h"
 #include "core/file_sys/vfs.h"
 #include "core/file_sys/vfs_real.h"
 #include "core/hle/service/acc/profile_manager.h"
+#include "core/hle/service/am/applets/applets.h"
 
 // These are wrappers to avoid the calls to CreateDirectory and CreateFile because of the Windows
 // defines.
@@ -59,6 +61,7 @@ static FileSys::VirtualFile VfsDirectoryCreateFileWrapper(const FileSys::Virtual
 #include "core/file_sys/romfs.h"
 #include "core/file_sys/savedata_factory.h"
 #include "core/file_sys/submission_package.h"
+#include "core/frontend/applets/software_keyboard.h"
 #include "core/hle/kernel/process.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/filesystem/fsp_ldr.h"
@@ -204,6 +207,27 @@ GMainWindow::~GMainWindow() {
         delete render_window;
 }
 
+void GMainWindow::SoftwareKeyboardGetText(
+    const Core::Frontend::SoftwareKeyboardParameters& parameters) {
+    QtSoftwareKeyboardDialog dialog(this, parameters);
+    dialog.setWindowFlags(Qt::Dialog | Qt::CustomizeWindowHint | Qt::WindowTitleHint |
+                          Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint);
+    dialog.setWindowModality(Qt::WindowModal);
+    dialog.exec();
+
+    if (!dialog.GetStatus()) {
+        emit SoftwareKeyboardFinishedText(std::nullopt);
+        return;
+    }
+
+    emit SoftwareKeyboardFinishedText(dialog.GetText());
+}
+
+void GMainWindow::SoftwareKeyboardInvokeCheckDialog(std::u16string error_message) {
+    QMessageBox::warning(this, tr("Text Check Failed"), QString::fromStdU16String(error_message));
+    emit SoftwareKeyboardFinishedCheckDialog();
+}
+
 void GMainWindow::InitializeWidgets() {
 #ifdef YUZU_ENABLE_COMPATIBILITY_REPORTING
     ui.action_Report_Compatibility->setVisible(true);
@@ -559,6 +583,8 @@ bool GMainWindow::LoadROM(const QString& filename) {
 
     system.SetGPUDebugContext(debug_context);
 
+    system.SetSoftwareKeyboard(std::make_unique<QtSoftwareKeyboard>(*this));
+
     const Core::System::ResultStatus result{system.Load(*render_window, filename.toStdString())};
 
     const auto drd_callout =
@@ -1228,8 +1254,13 @@ void GMainWindow::OnMenuRecentFile() {
 
 void GMainWindow::OnStartGame() {
     emu_thread->SetRunning(true);
+
+    qRegisterMetaType<Core::Frontend::SoftwareKeyboardParameters>(
+        "Core::Frontend::SoftwareKeyboardParameters");
     qRegisterMetaType<Core::System::ResultStatus>("Core::System::ResultStatus");
     qRegisterMetaType<std::string>("std::string");
+    qRegisterMetaType<std::optional<std::u16string>>("std::optional<std::u16string>");
+
     connect(emu_thread.get(), &EmuThread::ErrorThrown, this, &GMainWindow::OnCoreError);
 
     ui.action_Start->setEnabled(false);

src/yuzu/main.h

@@ -29,6 +29,10 @@ class ProfilerWidget;
 class WaitTreeWidget;
 enum class GameListOpenTarget;
 
+namespace Core::Frontend {
+struct SoftwareKeyboardParameters;
+} // namespace Core::Frontend
+
 namespace FileSys {
 class RegisteredCacheUnion;
 class VfsFilesystem;
@@ -95,6 +99,13 @@ signals:
     // Signal that tells widgets to update icons to use the current theme
     void UpdateThemedIcons();
 
+    void SoftwareKeyboardFinishedText(std::optional<std::u16string> text);
+    void SoftwareKeyboardFinishedCheckDialog();
+
+public slots:
+    void SoftwareKeyboardGetText(const Core::Frontend::SoftwareKeyboardParameters& parameters);
+    void SoftwareKeyboardInvokeCheckDialog(std::u16string error_message);
+
 private:
     void InitializeWidgets();
     void InitializeDebugWidgets();