43 files changed, 1180 insertions, 460 deletions

diff --git a/src/common/settings.h b/src/common/settings.h
index aa054dc24..b2b071e7e 100644
--- a/src/common/settings.h
+++ b/src/common/settings.h
@@ -384,6 +384,12 @@ struct Values {
                                                                   AstcRecompression::Bc3,
                                                                   "astc_recompression",
                                                                   Category::RendererAdvanced};
+    SwitchableSetting<VramUsageMode, true> vram_usage_mode{linkage,
+                                                           VramUsageMode::Conservative,
+                                                           VramUsageMode::Conservative,
+                                                           VramUsageMode::Aggressive,
+                                                           "vram_usage_mode",
+                                                           Category::RendererAdvanced};
     SwitchableSetting<bool> async_presentation{linkage,
 #ifdef ANDROID
                                                true,
diff --git a/src/common/settings_enums.h b/src/common/settings_enums.h
index f42367e67..6e247e930 100644
--- a/src/common/settings_enums.h
+++ b/src/common/settings_enums.h
@@ -122,6 +122,8 @@ ENUM(AstcRecompression, Uncompressed, Bc1, Bc3);
 
 ENUM(VSyncMode, Immediate, Mailbox, Fifo, FifoRelaxed);
 
+ENUM(VramUsageMode, Conservative, Aggressive);
+
 ENUM(RendererBackend, OpenGL, Vulkan, Null);
 
 ENUM(ShaderBackend, Glsl, Glasm, SpirV);
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index f67a12f8f..a7b760fa2 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -59,8 +59,12 @@ add_library(core STATIC
     file_sys/fs_path.h
     file_sys/fs_path_utility.h
     file_sys/fs_string_util.h
+    file_sys/fsa/fs_i_directory.h
+    file_sys/fsa/fs_i_file.h
+    file_sys/fsa/fs_i_filesystem.h
     file_sys/fsmitm_romfsbuild.cpp
     file_sys/fsmitm_romfsbuild.h
+    file_sys/fssrv/fssrv_sf_path.h
     file_sys/fssystem/fs_i_storage.h
     file_sys/fssystem/fs_types.h
     file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.cpp
@@ -891,6 +895,21 @@ add_library(core STATIC
     hle/service/pm/pm.h
     hle/service/prepo/prepo.cpp
     hle/service/prepo/prepo.h
+    hle/service/psc/ovln/ovln_types.h
+    hle/service/psc/ovln/receiver_service.cpp
+    hle/service/psc/ovln/receiver_service.h
+    hle/service/psc/ovln/receiver.cpp
+    hle/service/psc/ovln/receiver.h
+    hle/service/psc/ovln/sender_service.cpp
+    hle/service/psc/ovln/sender_service.h
+    hle/service/psc/ovln/sender.cpp
+    hle/service/psc/ovln/sender.h
+    hle/service/psc/pm_control.cpp
+    hle/service/psc/pm_control.h
+    hle/service/psc/pm_module.cpp
+    hle/service/psc/pm_module.h
+    hle/service/psc/pm_service.cpp
+    hle/service/psc/pm_service.h
     hle/service/psc/psc.cpp
     hle/service/psc/psc.h
     hle/service/psc/time/alarms.cpp
diff --git a/src/core/device_memory_manager.inc b/src/core/device_memory_manager.inc
index 37c1e69c3..f104d495b 100644
--- a/src/core/device_memory_manager.inc
+++ b/src/core/device_memory_manager.inc
@@ -522,13 +522,17 @@ void DeviceMemoryManager<Traits>::UpdatePagesCachedCount(DAddr addr, size_t size
     auto* memory_device_inter = registered_processes[asid.id];
     const auto release_pending = [&] {
         if (uncache_bytes > 0) {
-            MarkRegionCaching(memory_device_inter, uncache_begin << Memory::YUZU_PAGEBITS,
-                              uncache_bytes, false);
+            if (memory_device_inter != nullptr) {
+                MarkRegionCaching(memory_device_inter, uncache_begin << Memory::YUZU_PAGEBITS,
+                                  uncache_bytes, false);
+            }
             uncache_bytes = 0;
         }
         if (cache_bytes > 0) {
-            MarkRegionCaching(memory_device_inter, cache_begin << Memory::YUZU_PAGEBITS,
-                              cache_bytes, true);
+            if (memory_device_inter != nullptr) {
+                MarkRegionCaching(memory_device_inter, cache_begin << Memory::YUZU_PAGEBITS,
+                                  cache_bytes, true);
+            }
             cache_bytes = 0;
         }
     };
diff --git a/src/core/file_sys/fs_filesystem.h b/src/core/file_sys/fs_filesystem.h
index 7f237b7fa..329b5aca5 100644
--- a/src/core/file_sys/fs_filesystem.h
+++ b/src/core/file_sys/fs_filesystem.h
@@ -23,6 +23,8 @@ enum class OpenDirectoryMode : u64 {
     File = (1 << 1),
 
     All = (Directory | File),
+
+    NotRequireFileSize = (1ULL << 31),
 };
 DECLARE_ENUM_FLAG_OPERATORS(OpenDirectoryMode)
 
@@ -36,4 +38,29 @@ enum class CreateOption : u8 {
     BigFile = (1 << 0),
 };
 
+struct FileSystemAttribute {
+    u8 dir_entry_name_length_max_defined;
+    u8 file_entry_name_length_max_defined;
+    u8 dir_path_name_length_max_defined;
+    u8 file_path_name_length_max_defined;
+    INSERT_PADDING_BYTES_NOINIT(0x5);
+    u8 utf16_dir_entry_name_length_max_defined;
+    u8 utf16_file_entry_name_length_max_defined;
+    u8 utf16_dir_path_name_length_max_defined;
+    u8 utf16_file_path_name_length_max_defined;
+    INSERT_PADDING_BYTES_NOINIT(0x18);
+    s32 dir_entry_name_length_max;
+    s32 file_entry_name_length_max;
+    s32 dir_path_name_length_max;
+    s32 file_path_name_length_max;
+    INSERT_PADDING_WORDS_NOINIT(0x5);
+    s32 utf16_dir_entry_name_length_max;
+    s32 utf16_file_entry_name_length_max;
+    s32 utf16_dir_path_name_length_max;
+    s32 utf16_file_path_name_length_max;
+    INSERT_PADDING_WORDS_NOINIT(0x18);
+    INSERT_PADDING_WORDS_NOINIT(0x1);
+};
+static_assert(sizeof(FileSystemAttribute) == 0xC0, "FileSystemAttribute has incorrect size");
+
 } // namespace FileSys
diff --git a/src/core/file_sys/fs_memory_management.h b/src/core/file_sys/fs_memory_management.h
index f03c6354b..080017c5d 100644
--- a/src/core/file_sys/fs_memory_management.h
+++ b/src/core/file_sys/fs_memory_management.h
@@ -10,7 +10,7 @@ namespace FileSys {
 
 constexpr size_t RequiredAlignment = alignof(u64);
 
-void* AllocateUnsafe(size_t size) {
+inline void* AllocateUnsafe(size_t size) {
     // Allocate
     void* const ptr = ::operator new(size, std::align_val_t{RequiredAlignment});
 
@@ -21,16 +21,16 @@ void* AllocateUnsafe(size_t size) {
     return ptr;
 }
 
-void DeallocateUnsafe(void* ptr, size_t size) {
+inline void DeallocateUnsafe(void* ptr, size_t size) {
     // Deallocate the pointer
     ::operator delete(ptr, std::align_val_t{RequiredAlignment});
 }
 
-void* Allocate(size_t size) {
+inline void* Allocate(size_t size) {
     return AllocateUnsafe(size);
 }
 
-void Deallocate(void* ptr, size_t size) {
+inline void Deallocate(void* ptr, size_t size) {
     // If the pointer is non-null, deallocate it
     if (ptr != nullptr) {
         DeallocateUnsafe(ptr, size);
diff --git a/src/core/file_sys/fs_path.h b/src/core/file_sys/fs_path.h
index 56ba08a6a..1566e82b9 100644
--- a/src/core/file_sys/fs_path.h
+++ b/src/core/file_sys/fs_path.h
@@ -381,7 +381,7 @@ public:
 
         // Check that it's possible for us to remove a child
         auto* p = m_write_buffer.Get();
-        s32 len = std::strlen(p);
+        s32 len = static_cast<s32>(std::strlen(p));
         R_UNLESS(len != 1 || (p[0] != '/' && p[0] != '.'), ResultNotImplemented);
 
         // Handle a trailing separator
diff --git a/src/core/file_sys/fs_path_utility.h b/src/core/file_sys/fs_path_utility.h
index 5643141f9..cdfd8c772 100644
--- a/src/core/file_sys/fs_path_utility.h
+++ b/src/core/file_sys/fs_path_utility.h
@@ -426,9 +426,10 @@ public:
         R_SUCCEED();
     }
 
-    static Result Normalize(char* dst, size_t* out_len, const char* path, size_t max_out_size,
-                            bool is_windows_path, bool is_drive_relative_path,
-                            bool allow_all_characters = false) {
+    static constexpr Result Normalize(char* dst, size_t* out_len, const char* path,
+                                      size_t max_out_size, bool is_windows_path,
+                                      bool is_drive_relative_path,
+                                      bool allow_all_characters = false) {
         // Use StringTraits names for remainder of scope
         using namespace StringTraits;
 
diff --git a/src/core/file_sys/fs_string_util.h b/src/core/file_sys/fs_string_util.h
index 874e09054..c751a8f1a 100644
--- a/src/core/file_sys/fs_string_util.h
+++ b/src/core/file_sys/fs_string_util.h
@@ -20,6 +20,11 @@ constexpr int Strlen(const T* str) {
 }
 
 template <typename T>
+constexpr int Strnlen(const T* str, std::size_t count) {
+    return Strnlen(str, static_cast<int>(count));
+}
+
+template <typename T>
 constexpr int Strnlen(const T* str, int count) {
     ASSERT(str != nullptr);
     ASSERT(count >= 0);
@@ -33,6 +38,11 @@ constexpr int Strnlen(const T* str, int count) {
 }
 
 template <typename T>
+constexpr int Strncmp(const T* lhs, const T* rhs, std::size_t count) {
+    return Strncmp(lhs, rhs, static_cast<int>(count));
+}
+
+template <typename T>
 constexpr int Strncmp(const T* lhs, const T* rhs, int count) {
     ASSERT(lhs != nullptr);
     ASSERT(rhs != nullptr);
@@ -52,6 +62,11 @@ constexpr int Strncmp(const T* lhs, const T* rhs, int count) {
 }
 
 template <typename T>
+static constexpr int Strlcpy(T* dst, const T* src, std::size_t count) {
+    return Strlcpy<T>(dst, src, static_cast<int>(count));
+}
+
+template <typename T>
 static constexpr int Strlcpy(T* dst, const T* src, int count) {
     ASSERT(dst != nullptr);
     ASSERT(src != nullptr);
diff --git a/src/core/file_sys/fsa/fs_i_directory.h b/src/core/file_sys/fsa/fs_i_directory.h
new file mode 100644
index 000000000..c8e895eab
--- /dev/null
+++ b/src/core/file_sys/fsa/fs_i_directory.h
@@ -0,0 +1,91 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/common_types.h"
+#include "core/file_sys/errors.h"
+#include "core/file_sys/fs_directory.h"
+#include "core/file_sys/fs_file.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/savedata_factory.h"
+#include "core/file_sys/vfs/vfs.h"
+#include "core/hle/result.h"
+
+namespace FileSys::Fsa {
+
+class IDirectory {
+public:
+    explicit IDirectory(VirtualDir backend_, OpenDirectoryMode mode)
+        : backend(std::move(backend_)) {
+        // TODO(DarkLordZach): Verify that this is the correct behavior.
+        // Build entry index now to save time later.
+        if (True(mode & OpenDirectoryMode::Directory)) {
+            BuildEntryIndex(backend->GetSubdirectories(), DirectoryEntryType::Directory);
+        }
+        if (True(mode & OpenDirectoryMode::File)) {
+            BuildEntryIndex(backend->GetFiles(), DirectoryEntryType::File);
+        }
+    }
+    virtual ~IDirectory() {}
+
+    Result Read(s64* out_count, DirectoryEntry* out_entries, s64 max_entries) {
+        R_UNLESS(out_count != nullptr, ResultNullptrArgument);
+        if (max_entries == 0) {
+            *out_count = 0;
+            R_SUCCEED();
+        }
+        R_UNLESS(out_entries != nullptr, ResultNullptrArgument);
+        R_UNLESS(max_entries > 0, ResultInvalidArgument);
+        R_RETURN(this->DoRead(out_count, out_entries, max_entries));
+    }
+
+    Result GetEntryCount(s64* out) {
+        R_UNLESS(out != nullptr, ResultNullptrArgument);
+        R_RETURN(this->DoGetEntryCount(out));
+    }
+
+private:
+    Result DoRead(s64* out_count, DirectoryEntry* out_entries, s64 max_entries) {
+        const u64 actual_entries =
+            std::min(static_cast<u64>(max_entries), entries.size() - next_entry_index);
+        const auto* begin = reinterpret_cast<u8*>(entries.data() + next_entry_index);
+        const auto* end = reinterpret_cast<u8*>(entries.data() + next_entry_index + actual_entries);
+        const auto range_size = static_cast<std::size_t>(std::distance(begin, end));
+
+        next_entry_index += actual_entries;
+        *out_count = actual_entries;
+
+        std::memcpy(out_entries, begin, range_size);
+
+        R_SUCCEED();
+    }
+
+    Result DoGetEntryCount(s64* out) {
+        *out = entries.size() - next_entry_index;
+        R_SUCCEED();
+    }
+
+    // TODO: Remove this when VFS is gone
+    template <typename T>
+    void BuildEntryIndex(const std::vector<T>& new_data, DirectoryEntryType type) {
+        entries.reserve(entries.size() + new_data.size());
+
+        for (const auto& new_entry : new_data) {
+            auto name = new_entry->GetName();
+
+            if (type == DirectoryEntryType::File && name == GetSaveDataSizeFileName()) {
+                continue;
+            }
+
+            entries.emplace_back(name, static_cast<s8>(type),
+                                 type == DirectoryEntryType::Directory ? 0 : new_entry->GetSize());
+        }
+    }
+
+    VirtualDir backend;
+    std::vector<DirectoryEntry> entries;
+    u64 next_entry_index = 0;
+};
+
+} // namespace FileSys::Fsa
diff --git a/src/core/file_sys/fsa/fs_i_file.h b/src/core/file_sys/fsa/fs_i_file.h
new file mode 100644
index 000000000..1188ae8ca
--- /dev/null
+++ b/src/core/file_sys/fsa/fs_i_file.h
@@ -0,0 +1,167 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/overflow.h"
+#include "core/file_sys/errors.h"
+#include "core/file_sys/fs_file.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/fs_operate_range.h"
+#include "core/file_sys/vfs/vfs.h"
+#include "core/file_sys/vfs/vfs_types.h"
+#include "core/hle/result.h"
+
+namespace FileSys::Fsa {
+
+class IFile {
+public:
+    explicit IFile(VirtualFile backend_) : backend(std::move(backend_)) {}
+    virtual ~IFile() {}
+
+    Result Read(size_t* out, s64 offset, void* buffer, size_t size, const ReadOption& option) {
+        // Check that we have an output pointer
+        R_UNLESS(out != nullptr, ResultNullptrArgument);
+
+        // If we have nothing to read, just succeed
+        if (size == 0) {
+            *out = 0;
+            R_SUCCEED();
+        }
+
+        // Check that the read is valid
+        R_UNLESS(buffer != nullptr, ResultNullptrArgument);
+        R_UNLESS(offset >= 0, ResultOutOfRange);
+        R_UNLESS(Common::CanAddWithoutOverflow<s64>(offset, size), ResultOutOfRange);
+
+        // Do the read
+        R_RETURN(this->DoRead(out, offset, buffer, size, option));
+    }
+
+    Result Read(size_t* out, s64 offset, void* buffer, size_t size) {
+        R_RETURN(this->Read(out, offset, buffer, size, ReadOption::None));
+    }
+
+    Result GetSize(s64* out) {
+        R_UNLESS(out != nullptr, ResultNullptrArgument);
+        R_RETURN(this->DoGetSize(out));
+    }
+
+    Result Flush() {
+        R_RETURN(this->DoFlush());
+    }
+
+    Result Write(s64 offset, const void* buffer, size_t size, const WriteOption& option) {
+        // Handle the zero-size case
+        if (size == 0) {
+            if (option.HasFlushFlag()) {
+                R_TRY(this->Flush());
+            }
+            R_SUCCEED();
+        }
+
+        // Check the write is valid
+        R_UNLESS(buffer != nullptr, ResultNullptrArgument);
+        R_UNLESS(offset >= 0, ResultOutOfRange);
+        R_UNLESS(Common::CanAddWithoutOverflow<s64>(offset, size), ResultOutOfRange);
+
+        R_RETURN(this->DoWrite(offset, buffer, size, option));
+    }
+
+    Result SetSize(s64 size) {
+        R_UNLESS(size >= 0, ResultOutOfRange);
+        R_RETURN(this->DoSetSize(size));
+    }
+
+    Result OperateRange(void* dst, size_t dst_size, OperationId op_id, s64 offset, s64 size,
+                        const void* src, size_t src_size) {
+        R_RETURN(this->DoOperateRange(dst, dst_size, op_id, offset, size, src, src_size));
+    }
+
+    Result OperateRange(OperationId op_id, s64 offset, s64 size) {
+        R_RETURN(this->DoOperateRange(nullptr, 0, op_id, offset, size, nullptr, 0));
+    }
+
+protected:
+    Result DryRead(size_t* out, s64 offset, size_t size, const ReadOption& option,
+                   OpenMode open_mode) {
+        // Check that we can read
+        R_UNLESS(static_cast<u32>(open_mode & OpenMode::Read) != 0, ResultReadNotPermitted);
+
+        // Get the file size, and validate our offset
+        s64 file_size = 0;
+        R_TRY(this->DoGetSize(std::addressof(file_size)));
+        R_UNLESS(offset <= file_size, ResultOutOfRange);
+
+        *out = static_cast<size_t>(std::min(file_size - offset, static_cast<s64>(size)));
+        R_SUCCEED();
+    }
+
+    Result DrySetSize(s64 size, OpenMode open_mode) {
+        // Check that we can write
+        R_UNLESS(static_cast<u32>(open_mode & OpenMode::Write) != 0, ResultWriteNotPermitted);
+        R_SUCCEED();
+    }
+
+    Result DryWrite(bool* out_append, s64 offset, size_t size, const WriteOption& option,
+                    OpenMode open_mode) {
+        // Check that we can write
+        R_UNLESS(static_cast<u32>(open_mode & OpenMode::Write) != 0, ResultWriteNotPermitted);
+
+        // Get the file size
+        s64 file_size = 0;
+        R_TRY(this->DoGetSize(&file_size));
+
+        // Determine if we need to append
+        *out_append = false;
+        if (file_size < offset + static_cast<s64>(size)) {
+            R_UNLESS(static_cast<u32>(open_mode & OpenMode::AllowAppend) != 0,
+                     ResultFileExtensionWithoutOpenModeAllowAppend);
+            *out_append = true;
+        }
+
+        R_SUCCEED();
+    }
+
+private:
+    Result DoRead(size_t* out, s64 offset, void* buffer, size_t size, const ReadOption& option) {
+        const auto read_size = backend->Read(static_cast<u8*>(buffer), size, offset);
+        *out = read_size;
+
+        R_SUCCEED();
+    }
+
+    Result DoGetSize(s64* out) {
+        *out = backend->GetSize();
+        R_SUCCEED();
+    }
+
+    Result DoFlush() {
+        // Exists for SDK compatibiltity -- No need to flush file.
+        R_SUCCEED();
+    }
+
+    Result DoWrite(s64 offset, const void* buffer, size_t size, const WriteOption& option) {
+        const std::size_t written = backend->Write(static_cast<const u8*>(buffer), size, offset);
+
+        ASSERT_MSG(written == size,
+                   "Could not write all bytes to file (requested={:016X}, actual={:016X}).", size,
+                   written);
+
+        R_SUCCEED();
+    }
+
+    Result DoSetSize(s64 size) {
+        backend->Resize(size);
+        R_SUCCEED();
+    }
+
+    Result DoOperateRange(void* dst, size_t dst_size, OperationId op_id, s64 offset, s64 size,
+                          const void* src, size_t src_size) {
+        R_THROW(ResultNotImplemented);
+    }
+
+    VirtualFile backend;
+};
+
+} // namespace FileSys::Fsa
diff --git a/src/core/file_sys/fsa/fs_i_filesystem.h b/src/core/file_sys/fsa/fs_i_filesystem.h
new file mode 100644
index 000000000..8172190f4
--- /dev/null
+++ b/src/core/file_sys/fsa/fs_i_filesystem.h
@@ -0,0 +1,206 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/errors.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/fs_path.h"
+#include "core/file_sys/vfs/vfs_types.h"
+#include "core/hle/result.h"
+#include "core/hle/service/filesystem/filesystem.h"
+
+namespace FileSys::Fsa {
+
+class IFile;
+class IDirectory;
+
+enum class QueryId : u32 {
+    SetConcatenationFileAttribute = 0,
+    UpdateMac = 1,
+    IsSignedSystemPartitionOnSdCardValid = 2,
+    QueryUnpreparedFileInformation = 3,
+};
+
+class IFileSystem {
+public:
+    explicit IFileSystem(VirtualDir backend_) : backend{std::move(backend_)} {}
+    virtual ~IFileSystem() {}
+
+    Result CreateFile(const Path& path, s64 size, CreateOption option) {
+        R_UNLESS(size >= 0, ResultOutOfRange);
+        R_RETURN(this->DoCreateFile(path, size, static_cast<int>(option)));
+    }
+
+    Result CreateFile(const Path& path, s64 size) {
+        R_RETURN(this->CreateFile(path, size, CreateOption::None));
+    }
+
+    Result DeleteFile(const Path& path) {
+        R_RETURN(this->DoDeleteFile(path));
+    }
+
+    Result CreateDirectory(const Path& path) {
+        R_RETURN(this->DoCreateDirectory(path));
+    }
+
+    Result DeleteDirectory(const Path& path) {
+        R_RETURN(this->DoDeleteDirectory(path));
+    }
+
+    Result DeleteDirectoryRecursively(const Path& path) {
+        R_RETURN(this->DoDeleteDirectoryRecursively(path));
+    }
+
+    Result RenameFile(const Path& old_path, const Path& new_path) {
+        R_RETURN(this->DoRenameFile(old_path, new_path));
+    }
+
+    Result RenameDirectory(const Path& old_path, const Path& new_path) {
+        R_RETURN(this->DoRenameDirectory(old_path, new_path));
+    }
+
+    Result GetEntryType(DirectoryEntryType* out, const Path& path) {
+        R_RETURN(this->DoGetEntryType(out, path));
+    }
+
+    Result OpenFile(VirtualFile* out_file, const Path& path, OpenMode mode) {
+        R_UNLESS(out_file != nullptr, ResultNullptrArgument);
+        R_UNLESS(static_cast<u32>(mode & OpenMode::ReadWrite) != 0, ResultInvalidOpenMode);
+        R_UNLESS(static_cast<u32>(mode & ~OpenMode::All) == 0, ResultInvalidOpenMode);
+        R_RETURN(this->DoOpenFile(out_file, path, mode));
+    }
+
+    Result OpenDirectory(VirtualDir* out_dir, const Path& path, OpenDirectoryMode mode) {
+        R_UNLESS(out_dir != nullptr, ResultNullptrArgument);
+        R_UNLESS(static_cast<u64>(mode & OpenDirectoryMode::All) != 0, ResultInvalidOpenMode);
+        R_UNLESS(static_cast<u64>(
+                     mode & ~(OpenDirectoryMode::All | OpenDirectoryMode::NotRequireFileSize)) == 0,
+                 ResultInvalidOpenMode);
+        R_RETURN(this->DoOpenDirectory(out_dir, path, mode));
+    }
+
+    Result Commit() {
+        R_RETURN(this->DoCommit());
+    }
+
+    Result GetFreeSpaceSize(s64* out, const Path& path) {
+        R_UNLESS(out != nullptr, ResultNullptrArgument);
+        R_RETURN(this->DoGetFreeSpaceSize(out, path));
+    }
+
+    Result GetTotalSpaceSize(s64* out, const Path& path) {
+        R_UNLESS(out != nullptr, ResultNullptrArgument);
+        R_RETURN(this->DoGetTotalSpaceSize(out, path));
+    }
+
+    Result CleanDirectoryRecursively(const Path& path) {
+        R_RETURN(this->DoCleanDirectoryRecursively(path));
+    }
+
+    Result GetFileTimeStampRaw(FileTimeStampRaw* out, const Path& path) {
+        R_UNLESS(out != nullptr, ResultNullptrArgument);
+        R_RETURN(this->DoGetFileTimeStampRaw(out, path));
+    }
+
+    Result QueryEntry(char* dst, size_t dst_size, const char* src, size_t src_size, QueryId query,
+                      const Path& path) {
+        R_RETURN(this->DoQueryEntry(dst, dst_size, src, src_size, query, path));
+    }
+
+    // These aren't accessible as commands
+    Result CommitProvisionally(s64 counter) {
+        R_RETURN(this->DoCommitProvisionally(counter));
+    }
+
+    Result Rollback() {
+        R_RETURN(this->DoRollback());
+    }
+
+    Result Flush() {
+        R_RETURN(this->DoFlush());
+    }
+
+private:
+    Result DoCreateFile(const Path& path, s64 size, int flags) {
+        R_RETURN(backend.CreateFile(path.GetString(), size));
+    }
+
+    Result DoDeleteFile(const Path& path) {
+        R_RETURN(backend.DeleteFile(path.GetString()));
+    }
+
+    Result DoCreateDirectory(const Path& path) {
+        R_RETURN(backend.CreateDirectory(path.GetString()));
+    }
+
+    Result DoDeleteDirectory(const Path& path) {
+        R_RETURN(backend.DeleteDirectory(path.GetString()));
+    }
+
+    Result DoDeleteDirectoryRecursively(const Path& path) {
+        R_RETURN(backend.DeleteDirectoryRecursively(path.GetString()));
+    }
+
+    Result DoRenameFile(const Path& old_path, const Path& new_path) {
+        R_RETURN(backend.RenameFile(old_path.GetString(), new_path.GetString()));
+    }
+
+    Result DoRenameDirectory(const Path& old_path, const Path& new_path) {
+        R_RETURN(backend.RenameDirectory(old_path.GetString(), new_path.GetString()));
+    }
+
+    Result DoGetEntryType(DirectoryEntryType* out, const Path& path) {
+        R_RETURN(backend.GetEntryType(out, path.GetString()));
+    }
+
+    Result DoOpenFile(VirtualFile* out_file, const Path& path, OpenMode mode) {
+        R_RETURN(backend.OpenFile(out_file, path.GetString(), mode));
+    }
+
+    Result DoOpenDirectory(VirtualDir* out_directory, const Path& path, OpenDirectoryMode mode) {
+        R_RETURN(backend.OpenDirectory(out_directory, path.GetString()));
+    }
+
+    Result DoCommit() {
+        R_THROW(ResultNotImplemented);
+    }
+
+    Result DoGetFreeSpaceSize(s64* out, const Path& path) {
+        R_THROW(ResultNotImplemented);
+    }
+
+    Result DoGetTotalSpaceSize(s64* out, const Path& path) {
+        R_THROW(ResultNotImplemented);
+    }
+
+    Result DoCleanDirectoryRecursively(const Path& path) {
+        R_RETURN(backend.CleanDirectoryRecursively(path.GetString()));
+    }
+
+    Result DoGetFileTimeStampRaw(FileTimeStampRaw* out, const Path& path) {
+        R_RETURN(backend.GetFileTimeStampRaw(out, path.GetString()));
+    }
+
+    Result DoQueryEntry(char* dst, size_t dst_size, const char* src, size_t src_size, QueryId query,
+                        const Path& path) {
+        R_THROW(ResultNotImplemented);
+    }
+
+    // These aren't accessible as commands
+    Result DoCommitProvisionally(s64 counter) {
+        R_THROW(ResultNotImplemented);
+    }
+
+    Result DoRollback() {
+        R_THROW(ResultNotImplemented);
+    }
+
+    Result DoFlush() {
+        R_THROW(ResultNotImplemented);
+    }
+
+    Service::FileSystem::VfsDirectoryServiceWrapper backend;
+};
+
+} // namespace FileSys::Fsa
diff --git a/src/core/file_sys/fssrv/fssrv_sf_path.h b/src/core/file_sys/fssrv/fssrv_sf_path.h
new file mode 100644
index 000000000..a0c0b2dac
--- /dev/null
+++ b/src/core/file_sys/fssrv/fssrv_sf_path.h
@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/fs_directory.h"
+
+namespace FileSys::Sf {
+
+struct Path {
+    char str[EntryNameLengthMax + 1];
+
+    static constexpr Path Encode(const char* p) {
+        Path path = {};
+        for (size_t i = 0; i < sizeof(path) - 1; i++) {
+            path.str[i] = p[i];
+            if (p[i] == '\x00') {
+                break;
+            }
+        }
+        return path;
+    }
+
+    static constexpr size_t GetPathLength(const Path& path) {
+        size_t len = 0;
+        for (size_t i = 0; i < sizeof(path) - 1 && path.str[i] != '\x00'; i++) {
+            len++;
+        }
+        return len;
+    }
+};
+static_assert(std::is_trivially_copyable_v<Path>, "Path must be trivially copyable.");
+
+using FspPath = Path;
+
+} // namespace FileSys::Sf
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp b/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp
index 39690018b..8483394d0 100644
--- a/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp
+++ b/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp
@@ -3,82 +3,34 @@
 
 #include "core/file_sys/fs_filesystem.h"
 #include "core/file_sys/savedata_factory.h"
+#include "core/hle/service/cmif_serialization.h"
 #include "core/hle/service/filesystem/fsp/fs_i_directory.h"
-#include "core/hle/service/ipc_helpers.h"
 
 namespace Service::FileSystem {
 
-template <typename T>
-static void BuildEntryIndex(std::vector<FileSys::DirectoryEntry>& entries,
-                            const std::vector<T>& new_data, FileSys::DirectoryEntryType type) {
-    entries.reserve(entries.size() + new_data.size());
-
-    for (const auto& new_entry : new_data) {
-        auto name = new_entry->GetName();
-
-        if (type == FileSys::DirectoryEntryType::File &&
-            name == FileSys::GetSaveDataSizeFileName()) {
-            continue;
-        }
-
-        entries.emplace_back(name, static_cast<s8>(type),
-                             type == FileSys::DirectoryEntryType::Directory ? 0
-                                                                            : new_entry->GetSize());
-    }
-}
-
-IDirectory::IDirectory(Core::System& system_, FileSys::VirtualDir backend_,
+IDirectory::IDirectory(Core::System& system_, FileSys::VirtualDir directory_,
                        FileSys::OpenDirectoryMode mode)
-    : ServiceFramework{system_, "IDirectory"}, backend(std::move(backend_)) {
+    : ServiceFramework{system_, "IDirectory"},
+      backend(std::make_unique<FileSys::Fsa::IDirectory>(directory_, mode)) {
     static const FunctionInfo functions[] = {
-        {0, &IDirectory::Read, "Read"},
-        {1, &IDirectory::GetEntryCount, "GetEntryCount"},
+        {0, D<&IDirectory::Read>, "Read"},
+        {1, D<&IDirectory::GetEntryCount>, "GetEntryCount"},
     };
     RegisterHandlers(functions);
-
-    // TODO(DarkLordZach): Verify that this is the correct behavior.
-    // Build entry index now to save time later.
-    if (True(mode & FileSys::OpenDirectoryMode::Directory)) {
-        BuildEntryIndex(entries, backend->GetSubdirectories(),
-                        FileSys::DirectoryEntryType::Directory);
-    }
-    if (True(mode & FileSys::OpenDirectoryMode::File)) {
-        BuildEntryIndex(entries, backend->GetFiles(), FileSys::DirectoryEntryType::File);
-    }
 }
 
-void IDirectory::Read(HLERequestContext& ctx) {
+Result IDirectory::Read(
+    Out<s64> out_count,
+    const OutArray<FileSys::DirectoryEntry, BufferAttr_HipcMapAlias> out_entries) {
     LOG_DEBUG(Service_FS, "called.");
 
-    // Calculate how many entries we can fit in the output buffer
-    const u64 count_entries = ctx.GetWriteBufferNumElements<FileSys::DirectoryEntry>();
-
-    // Cap at total number of entries.
-    const u64 actual_entries = std::min(count_entries, entries.size() - next_entry_index);
-
-    // Determine data start and end
-    const auto* begin = reinterpret_cast<u8*>(entries.data() + next_entry_index);
-    const auto* end = reinterpret_cast<u8*>(entries.data() + next_entry_index + actual_entries);
-    const auto range_size = static_cast<std::size_t>(std::distance(begin, end));
-
-    next_entry_index += actual_entries;
-
-    // Write the data to memory
-    ctx.WriteBuffer(begin, range_size);
-
-    IPC::ResponseBuilder rb{ctx, 4};
-    rb.Push(ResultSuccess);
-    rb.Push(actual_entries);
+    R_RETURN(backend->Read(out_count, out_entries.data(), out_entries.size()));
 }
 
-void IDirectory::GetEntryCount(HLERequestContext& ctx) {
+Result IDirectory::GetEntryCount(Out<s64> out_count) {
     LOG_DEBUG(Service_FS, "called");
 
-    u64 count = entries.size() - next_entry_index;
-
-    IPC::ResponseBuilder rb{ctx, 4};
-    rb.Push(ResultSuccess);
-    rb.Push(count);
+    R_RETURN(backend->GetEntryCount(out_count));
 }
 
 } // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_directory.h b/src/core/hle/service/filesystem/fsp/fs_i_directory.h
index 793ecfcd7..b6251f7fd 100644
--- a/src/core/hle/service/filesystem/fsp/fs_i_directory.h
+++ b/src/core/hle/service/filesystem/fsp/fs_i_directory.h
@@ -3,7 +3,9 @@
 
 #pragma once
 
+#include "core/file_sys/fsa/fs_i_directory.h"
 #include "core/file_sys/vfs/vfs.h"
+#include "core/hle/service/cmif_types.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/service.h"
 
@@ -15,16 +17,15 @@ namespace Service::FileSystem {
 
 class IDirectory final : public ServiceFramework<IDirectory> {
 public:
-    explicit IDirectory(Core::System& system_, FileSys::VirtualDir backend_,
+    explicit IDirectory(Core::System& system_, FileSys::VirtualDir directory_,
                         FileSys::OpenDirectoryMode mode);
 
 private:
-    FileSys::VirtualDir backend;
-    std::vector<FileSys::DirectoryEntry> entries;
-    u64 next_entry_index = 0;
+    std::unique_ptr<FileSys::Fsa::IDirectory> backend;
 
-    void Read(HLERequestContext& ctx);
-    void GetEntryCount(HLERequestContext& ctx);
+    Result Read(Out<s64> out_count,
+                const OutArray<FileSys::DirectoryEntry, BufferAttr_HipcMapAlias> out_entries);
+    Result GetEntryCount(Out<s64> out_count);
 };
 
 } // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_file.cpp b/src/core/hle/service/filesystem/fsp/fs_i_file.cpp
index 9a18f6ec5..a355d46ae 100644
--- a/src/core/hle/service/filesystem/fsp/fs_i_file.cpp
+++ b/src/core/hle/service/filesystem/fsp/fs_i_file.cpp
@@ -2,126 +2,64 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "core/file_sys/errors.h"
+#include "core/hle/service/cmif_serialization.h"
 #include "core/hle/service/filesystem/fsp/fs_i_file.h"
-#include "core/hle/service/ipc_helpers.h"
 
 namespace Service::FileSystem {
 
-IFile::IFile(Core::System& system_, FileSys::VirtualFile backend_)
-    : ServiceFramework{system_, "IFile"}, backend(std::move(backend_)) {
+IFile::IFile(Core::System& system_, FileSys::VirtualFile file_)
+    : ServiceFramework{system_, "IFile"}, backend{std::make_unique<FileSys::Fsa::IFile>(file_)} {
+    // clang-format off
     static const FunctionInfo functions[] = {
-        {0, &IFile::Read, "Read"},
-        {1, &IFile::Write, "Write"},
-        {2, &IFile::Flush, "Flush"},
-        {3, &IFile::SetSize, "SetSize"},
-        {4, &IFile::GetSize, "GetSize"},
+        {0, D<&IFile::Read>, "Read"},
+        {1, D<&IFile::Write>, "Write"},
+        {2, D<&IFile::Flush>, "Flush"},
+        {3, D<&IFile::SetSize>, "SetSize"},
+        {4, D<&IFile::GetSize>, "GetSize"},
         {5, nullptr, "OperateRange"},
         {6, nullptr, "OperateRangeWithBuffer"},
     };
+    // clang-format on
     RegisterHandlers(functions);
 }
 
-void IFile::Read(HLERequestContext& ctx) {
-    IPC::RequestParser rp{ctx};
-    const u64 option = rp.Pop<u64>();
-    const s64 offset = rp.Pop<s64>();
-    const s64 length = rp.Pop<s64>();
-
-    LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option, offset, length);
-
-    // Error checking
-    if (length < 0) {
-        LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(FileSys::ResultInvalidSize);
-        return;
-    }
-    if (offset < 0) {
-        LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(FileSys::ResultInvalidOffset);
-        return;
-    }
+Result IFile::Read(
+    FileSys::ReadOption option, Out<s64> out_size, s64 offset,
+    const OutBuffer<BufferAttr_HipcMapAlias | BufferAttr_HipcMapTransferAllowsNonSecure> out_buffer,
+    s64 size) {
+    LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option.value, offset,
+              size);
 
     // Read the data from the Storage backend
-    std::vector<u8> output = backend->ReadBytes(length, offset);
-
-    // Write the data to memory
-    ctx.WriteBuffer(output);
-
-    IPC::ResponseBuilder rb{ctx, 4};
-    rb.Push(ResultSuccess);
-    rb.Push(static_cast<u64>(output.size()));
+    R_RETURN(
+        backend->Read(reinterpret_cast<size_t*>(out_size.Get()), offset, out_buffer.data(), size));
 }
 
-void IFile::Write(HLERequestContext& ctx) {
-    IPC::RequestParser rp{ctx};
-    const u64 option = rp.Pop<u64>();
-    const s64 offset = rp.Pop<s64>();
-    const s64 length = rp.Pop<s64>();
-
-    LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option, offset, length);
-
-    // Error checking
-    if (length < 0) {
-        LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(FileSys::ResultInvalidSize);
-        return;
-    }
-    if (offset < 0) {
-        LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(FileSys::ResultInvalidOffset);
-        return;
-    }
-
-    const auto data = ctx.ReadBuffer();
+Result IFile::Write(
+    const InBuffer<BufferAttr_HipcMapAlias | BufferAttr_HipcMapTransferAllowsNonSecure> buffer,
+    FileSys::WriteOption option, s64 offset, s64 size) {
+    LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option.value, offset,
+              size);
 
-    ASSERT_MSG(static_cast<s64>(data.size()) <= length,
-               "Attempting to write more data than requested (requested={:016X}, actual={:016X}).",
-               length, data.size());
-
-    // Write the data to the Storage backend
-    const auto write_size =
-        static_cast<std::size_t>(std::distance(data.begin(), data.begin() + length));
-    const std::size_t written = backend->Write(data.data(), write_size, offset);
-
-    ASSERT_MSG(static_cast<s64>(written) == length,
-               "Could not write all bytes to file (requested={:016X}, actual={:016X}).", length,
-               written);
-
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(ResultSuccess);
+    R_RETURN(backend->Write(offset, buffer.data(), size, option));
 }
 
-void IFile::Flush(HLERequestContext& ctx) {
+Result IFile::Flush() {
     LOG_DEBUG(Service_FS, "called");
 
-    // Exists for SDK compatibiltity -- No need to flush file.
-
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(ResultSuccess);
+    R_RETURN(backend->Flush());
 }
 
-void IFile::SetSize(HLERequestContext& ctx) {
-    IPC::RequestParser rp{ctx};
-    const u64 size = rp.Pop<u64>();
+Result IFile::SetSize(s64 size) {
     LOG_DEBUG(Service_FS, "called, size={}", size);
 
-    backend->Resize(size);
-
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(ResultSuccess);
+    R_RETURN(backend->SetSize(size));
 }
 
-void IFile::GetSize(HLERequestContext& ctx) {
-    const u64 size = backend->GetSize();
-    LOG_DEBUG(Service_FS, "called, size={}", size);
+Result IFile::GetSize(Out<s64> out_size) {
+    LOG_DEBUG(Service_FS, "called");
 
-    IPC::ResponseBuilder rb{ctx, 4};
-    rb.Push(ResultSuccess);
-    rb.Push<u64>(size);
+    R_RETURN(backend->GetSize(out_size));
 }
 
 } // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_file.h b/src/core/hle/service/filesystem/fsp/fs_i_file.h
index 5e5430c67..e8599ee2f 100644
--- a/src/core/hle/service/filesystem/fsp/fs_i_file.h
+++ b/src/core/hle/service/filesystem/fsp/fs_i_file.h
@@ -3,6 +3,8 @@
 
 #pragma once
 
+#include "core/file_sys/fsa/fs_i_file.h"
+#include "core/hle/service/cmif_types.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/service.h"
 
@@ -10,16 +12,21 @@ namespace Service::FileSystem {
 
 class IFile final : public ServiceFramework<IFile> {
 public:
-    explicit IFile(Core::System& system_, FileSys::VirtualFile backend_);
+    explicit IFile(Core::System& system_, FileSys::VirtualFile file_);
 
 private:
-    FileSys::VirtualFile backend;
+    std::unique_ptr<FileSys::Fsa::IFile> backend;
 
-    void Read(HLERequestContext& ctx);
-    void Write(HLERequestContext& ctx);
-    void Flush(HLERequestContext& ctx);
-    void SetSize(HLERequestContext& ctx);
-    void GetSize(HLERequestContext& ctx);
+    Result Read(FileSys::ReadOption option, Out<s64> out_size, s64 offset,
+                const OutBuffer<BufferAttr_HipcMapAlias | BufferAttr_HipcMapTransferAllowsNonSecure>
+                    out_buffer,
+                s64 size);
+    Result Write(
+        const InBuffer<BufferAttr_HipcMapAlias | BufferAttr_HipcMapTransferAllowsNonSecure> buffer,
+        FileSys::WriteOption option, s64 offset, s64 size);
+    Result Flush();
+    Result SetSize(s64 size);
+    Result GetSize(Out<s64> out_size);
 };
 
 } // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_filesystem.cpp b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.cpp
index efa394dd1..d881e144d 100644
--- a/src/core/hle/service/filesystem/fsp/fs_i_filesystem.cpp
+++ b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.cpp
@@ -2,261 +2,172 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "common/string_util.h"
+#include "core/file_sys/fssrv/fssrv_sf_path.h"
+#include "core/hle/service/cmif_serialization.h"
 #include "core/hle/service/filesystem/fsp/fs_i_directory.h"
 #include "core/hle/service/filesystem/fsp/fs_i_file.h"
 #include "core/hle/service/filesystem/fsp/fs_i_filesystem.h"
-#include "core/hle/service/ipc_helpers.h"
 
 namespace Service::FileSystem {
 
-IFileSystem::IFileSystem(Core::System& system_, FileSys::VirtualDir backend_, SizeGetter size_)
-    : ServiceFramework{system_, "IFileSystem"}, backend{std::move(backend_)}, size{std::move(
-                                                                                  size_)} {
+IFileSystem::IFileSystem(Core::System& system_, FileSys::VirtualDir dir_, SizeGetter size_getter_)
+    : ServiceFramework{system_, "IFileSystem"}, backend{std::make_unique<FileSys::Fsa::IFileSystem>(
+                                                    dir_)},
+      size_getter{std::move(size_getter_)} {
     static const FunctionInfo functions[] = {
-        {0, &IFileSystem::CreateFile, "CreateFile"},
-        {1, &IFileSystem::DeleteFile, "DeleteFile"},
-        {2, &IFileSystem::CreateDirectory, "CreateDirectory"},
-        {3, &IFileSystem::DeleteDirectory, "DeleteDirectory"},
-        {4, &IFileSystem::DeleteDirectoryRecursively, "DeleteDirectoryRecursively"},
-        {5, &IFileSystem::RenameFile, "RenameFile"},
+        {0, D<&IFileSystem::CreateFile>, "CreateFile"},
+        {1, D<&IFileSystem::DeleteFile>, "DeleteFile"},
+        {2, D<&IFileSystem::CreateDirectory>, "CreateDirectory"},
+        {3, D<&IFileSystem::DeleteDirectory>, "DeleteDirectory"},
+        {4, D<&IFileSystem::DeleteDirectoryRecursively>, "DeleteDirectoryRecursively"},
+        {5, D<&IFileSystem::RenameFile>, "RenameFile"},
         {6, nullptr, "RenameDirectory"},
-        {7, &IFileSystem::GetEntryType, "GetEntryType"},
-        {8, &IFileSystem::OpenFile, "OpenFile"},
-        {9, &IFileSystem::OpenDirectory, "OpenDirectory"},
-        {10, &IFileSystem::Commit, "Commit"},
-        {11, &IFileSystem::GetFreeSpaceSize, "GetFreeSpaceSize"},
-        {12, &IFileSystem::GetTotalSpaceSize, "GetTotalSpaceSize"},
-        {13, &IFileSystem::CleanDirectoryRecursively, "CleanDirectoryRecursively"},
-        {14, &IFileSystem::GetFileTimeStampRaw, "GetFileTimeStampRaw"},
+        {7, D<&IFileSystem::GetEntryType>, "GetEntryType"},
+        {8, D<&IFileSystem::OpenFile>, "OpenFile"},
+        {9, D<&IFileSystem::OpenDirectory>, "OpenDirectory"},
+        {10, D<&IFileSystem::Commit>, "Commit"},
+        {11, D<&IFileSystem::GetFreeSpaceSize>, "GetFreeSpaceSize"},
+        {12, D<&IFileSystem::GetTotalSpaceSize>, "GetTotalSpaceSize"},
+        {13, D<&IFileSystem::CleanDirectoryRecursively>, "CleanDirectoryRecursively"},
+        {14, D<&IFileSystem::GetFileTimeStampRaw>, "GetFileTimeStampRaw"},
         {15, nullptr, "QueryEntry"},
-        {16, &IFileSystem::GetFileSystemAttribute, "GetFileSystemAttribute"},
+        {16, D<&IFileSystem::GetFileSystemAttribute>, "GetFileSystemAttribute"},
     };
     RegisterHandlers(functions);
 }
 
-void IFileSystem::CreateFile(HLERequestContext& ctx) {
-    IPC::RequestParser rp{ctx};
+Result IFileSystem::CreateFile(const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path,
+                               s32 option, s64 size) {
+    LOG_DEBUG(Service_FS, "called. file={}, option=0x{:X}, size=0x{:08X}", path->str, option, size);
 
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
-
-    const u64 file_mode = rp.Pop<u64>();
-    const u32 file_size = rp.Pop<u32>();
-
-    LOG_DEBUG(Service_FS, "called. file={}, mode=0x{:X}, size=0x{:08X}", name, file_mode,
-              file_size);
-
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(backend.CreateFile(name, file_size));
+    R_RETURN(backend->CreateFile(FileSys::Path(path->str), size));
 }
 
-void IFileSystem::DeleteFile(HLERequestContext& ctx) {
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
+Result IFileSystem::DeleteFile(const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
+    LOG_DEBUG(Service_FS, "called. file={}", path->str);
 
-    LOG_DEBUG(Service_FS, "called. file={}", name);
-
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(backend.DeleteFile(name));
+    R_RETURN(backend->DeleteFile(FileSys::Path(path->str)));
 }
 
-void IFileSystem::CreateDirectory(HLERequestContext& ctx) {
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
-
-    LOG_DEBUG(Service_FS, "called. directory={}", name);
+Result IFileSystem::CreateDirectory(
+    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
+    LOG_DEBUG(Service_FS, "called. directory={}", path->str);
 
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(backend.CreateDirectory(name));
+    R_RETURN(backend->CreateDirectory(FileSys::Path(path->str)));
 }
 
-void IFileSystem::DeleteDirectory(HLERequestContext& ctx) {
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
-
-    LOG_DEBUG(Service_FS, "called. directory={}", name);
+Result IFileSystem::DeleteDirectory(
+    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
+    LOG_DEBUG(Service_FS, "called. directory={}", path->str);
 
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(backend.DeleteDirectory(name));
+    R_RETURN(backend->DeleteDirectory(FileSys::Path(path->str)));
 }
 
-void IFileSystem::DeleteDirectoryRecursively(HLERequestContext& ctx) {
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
+Result IFileSystem::DeleteDirectoryRecursively(
+    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
+    LOG_DEBUG(Service_FS, "called. directory={}", path->str);
 
-    LOG_DEBUG(Service_FS, "called. directory={}", name);
-
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(backend.DeleteDirectoryRecursively(name));
+    R_RETURN(backend->DeleteDirectoryRecursively(FileSys::Path(path->str)));
 }
 
-void IFileSystem::CleanDirectoryRecursively(HLERequestContext& ctx) {
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
-
-    LOG_DEBUG(Service_FS, "called. Directory: {}", name);
+Result IFileSystem::CleanDirectoryRecursively(
+    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
+    LOG_DEBUG(Service_FS, "called. Directory: {}", path->str);
 
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(backend.CleanDirectoryRecursively(name));
+    R_RETURN(backend->CleanDirectoryRecursively(FileSys::Path(path->str)));
 }
 
-void IFileSystem::RenameFile(HLERequestContext& ctx) {
-    const std::string src_name = Common::StringFromBuffer(ctx.ReadBuffer(0));
-    const std::string dst_name = Common::StringFromBuffer(ctx.ReadBuffer(1));
-
-    LOG_DEBUG(Service_FS, "called. file '{}' to file '{}'", src_name, dst_name);
+Result IFileSystem::RenameFile(
+    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> old_path,
+    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> new_path) {
+    LOG_DEBUG(Service_FS, "called. file '{}' to file '{}'", old_path->str, new_path->str);
 
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(backend.RenameFile(src_name, dst_name));
+    R_RETURN(backend->RenameFile(FileSys::Path(old_path->str), FileSys::Path(new_path->str)));
 }
 
-void IFileSystem::OpenFile(HLERequestContext& ctx) {
-    IPC::RequestParser rp{ctx};
-
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
-
-    const auto mode = static_cast<FileSys::OpenMode>(rp.Pop<u32>());
-
-    LOG_DEBUG(Service_FS, "called. file={}, mode={}", name, mode);
+Result IFileSystem::OpenFile(OutInterface<IFile> out_interface,
+                             const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path,
+                             u32 mode) {
+    LOG_DEBUG(Service_FS, "called. file={}, mode={}", path->str, mode);
 
     FileSys::VirtualFile vfs_file{};
-    auto result = backend.OpenFile(&vfs_file, name, mode);
-    if (result != ResultSuccess) {
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(result);
-        return;
-    }
-
-    auto file = std::make_shared<IFile>(system, vfs_file);
-
-    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-    rb.Push(ResultSuccess);
-    rb.PushIpcInterface<IFile>(std::move(file));
-}
-
-void IFileSystem::OpenDirectory(HLERequestContext& ctx) {
-    IPC::RequestParser rp{ctx};
+    R_TRY(backend->OpenFile(&vfs_file, FileSys::Path(path->str),
+                            static_cast<FileSys::OpenMode>(mode)));
 
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
-    const auto mode = rp.PopRaw<FileSys::OpenDirectoryMode>();
+    *out_interface = std::make_shared<IFile>(system, vfs_file);
+    R_SUCCEED();
+}
 
-    LOG_DEBUG(Service_FS, "called. directory={}, mode={}", name, mode);
+Result IFileSystem::OpenDirectory(OutInterface<IDirectory> out_interface,
+                                  const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path,
+                                  u32 mode) {
+    LOG_DEBUG(Service_FS, "called. directory={}, mode={}", path->str, mode);
 
     FileSys::VirtualDir vfs_dir{};
-    auto result = backend.OpenDirectory(&vfs_dir, name);
-    if (result != ResultSuccess) {
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(result);
-        return;
-    }
-
-    auto directory = std::make_shared<IDirectory>(system, vfs_dir, mode);
-
-    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-    rb.Push(ResultSuccess);
-    rb.PushIpcInterface<IDirectory>(std::move(directory));
-}
+    R_TRY(backend->OpenDirectory(&vfs_dir, FileSys::Path(path->str),
+                                 static_cast<FileSys::OpenDirectoryMode>(mode)));
 
-void IFileSystem::GetEntryType(HLERequestContext& ctx) {
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
+    *out_interface = std::make_shared<IDirectory>(system, vfs_dir,
+                                                  static_cast<FileSys::OpenDirectoryMode>(mode));
+    R_SUCCEED();
+}
 
-    LOG_DEBUG(Service_FS, "called. file={}", name);
+Result IFileSystem::GetEntryType(
+    Out<u32> out_type, const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
+    LOG_DEBUG(Service_FS, "called. file={}", path->str);
 
     FileSys::DirectoryEntryType vfs_entry_type{};
-    auto result = backend.GetEntryType(&vfs_entry_type, name);
-    if (result != ResultSuccess) {
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(result);
-        return;
-    }
-
-    IPC::ResponseBuilder rb{ctx, 3};
-    rb.Push(ResultSuccess);
-    rb.Push<u32>(static_cast<u32>(vfs_entry_type));
+    R_TRY(backend->GetEntryType(&vfs_entry_type, FileSys::Path(path->str)));
+
+    *out_type = static_cast<u32>(vfs_entry_type);
+    R_SUCCEED();
 }
 
-void IFileSystem::Commit(HLERequestContext& ctx) {
+Result IFileSystem::Commit() {
     LOG_WARNING(Service_FS, "(STUBBED) called");
 
-    IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(ResultSuccess);
+    R_SUCCEED();
 }
 
-void IFileSystem::GetFreeSpaceSize(HLERequestContext& ctx) {
+Result IFileSystem::GetFreeSpaceSize(
+    Out<s64> out_size, const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
     LOG_DEBUG(Service_FS, "called");
 
-    IPC::ResponseBuilder rb{ctx, 4};
-    rb.Push(ResultSuccess);
-    rb.Push(size.get_free_size());
+    *out_size = size_getter.get_free_size();
+    R_SUCCEED();
 }
 
-void IFileSystem::GetTotalSpaceSize(HLERequestContext& ctx) {
+Result IFileSystem::GetTotalSpaceSize(
+    Out<s64> out_size, const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
     LOG_DEBUG(Service_FS, "called");
 
-    IPC::ResponseBuilder rb{ctx, 4};
-    rb.Push(ResultSuccess);
-    rb.Push(size.get_total_size());
+    *out_size = size_getter.get_total_size();
+    R_SUCCEED();
 }
 
-void IFileSystem::GetFileTimeStampRaw(HLERequestContext& ctx) {
-    const auto file_buffer = ctx.ReadBuffer();
-    const std::string name = Common::StringFromBuffer(file_buffer);
-
-    LOG_WARNING(Service_FS, "(Partial Implementation) called. file={}", name);
+Result IFileSystem::GetFileTimeStampRaw(
+    Out<FileSys::FileTimeStampRaw> out_timestamp,
+    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path) {
+    LOG_WARNING(Service_FS, "(Partial Implementation) called. file={}", path->str);
 
     FileSys::FileTimeStampRaw vfs_timestamp{};
-    auto result = backend.GetFileTimeStampRaw(&vfs_timestamp, name);
-    if (result != ResultSuccess) {
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(result);
-        return;
-    }
-
-    IPC::ResponseBuilder rb{ctx, 10};
-    rb.Push(ResultSuccess);
-    rb.PushRaw(vfs_timestamp);
+    R_TRY(backend->GetFileTimeStampRaw(&vfs_timestamp, FileSys::Path(path->str)));
+
+    *out_timestamp = vfs_timestamp;
+    R_SUCCEED();
 }
 
-void IFileSystem::GetFileSystemAttribute(HLERequestContext& ctx) {
+Result IFileSystem::GetFileSystemAttribute(Out<FileSys::FileSystemAttribute> out_attribute) {
     LOG_WARNING(Service_FS, "(STUBBED) called");
 
-    struct FileSystemAttribute {
-        u8 dir_entry_name_length_max_defined;
-        u8 file_entry_name_length_max_defined;
-        u8 dir_path_name_length_max_defined;
-        u8 file_path_name_length_max_defined;
-        INSERT_PADDING_BYTES_NOINIT(0x5);
-        u8 utf16_dir_entry_name_length_max_defined;
-        u8 utf16_file_entry_name_length_max_defined;
-        u8 utf16_dir_path_name_length_max_defined;
-        u8 utf16_file_path_name_length_max_defined;
-        INSERT_PADDING_BYTES_NOINIT(0x18);
-        s32 dir_entry_name_length_max;
-        s32 file_entry_name_length_max;
-        s32 dir_path_name_length_max;
-        s32 file_path_name_length_max;
-        INSERT_PADDING_WORDS_NOINIT(0x5);
-        s32 utf16_dir_entry_name_length_max;
-        s32 utf16_file_entry_name_length_max;
-        s32 utf16_dir_path_name_length_max;
-        s32 utf16_file_path_name_length_max;
-        INSERT_PADDING_WORDS_NOINIT(0x18);
-        INSERT_PADDING_WORDS_NOINIT(0x1);
-    };
-    static_assert(sizeof(FileSystemAttribute) == 0xc0, "FileSystemAttribute has incorrect size");
-
-    FileSystemAttribute savedata_attribute{};
+    FileSys::FileSystemAttribute savedata_attribute{};
     savedata_attribute.dir_entry_name_length_max_defined = true;
     savedata_attribute.file_entry_name_length_max_defined = true;
     savedata_attribute.dir_entry_name_length_max = 0x40;
     savedata_attribute.file_entry_name_length_max = 0x40;
 
-    IPC::ResponseBuilder rb{ctx, 50};
-    rb.Push(ResultSuccess);
-    rb.PushRaw(savedata_attribute);
+    *out_attribute = savedata_attribute;
+    R_SUCCEED();
 }
 
 } // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_filesystem.h b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.h
index b06b3ef0e..113369203 100644
--- a/src/core/hle/service/filesystem/fsp/fs_i_filesystem.h
+++ b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.h
@@ -3,36 +3,58 @@
 
 #pragma once
 
+#include "common/common_funcs.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/fsa/fs_i_filesystem.h"
 #include "core/file_sys/vfs/vfs.h"
+#include "core/hle/service/cmif_types.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/filesystem/fsp/fsp_util.h"
 #include "core/hle/service/service.h"
 
+namespace FileSys::Sf {
+struct Path;
+}
+
 namespace Service::FileSystem {
 
+class IFile;
+class IDirectory;
+
 class IFileSystem final : public ServiceFramework<IFileSystem> {
 public:
-    explicit IFileSystem(Core::System& system_, FileSys::VirtualDir backend_, SizeGetter size_);
-
-    void CreateFile(HLERequestContext& ctx);
-    void DeleteFile(HLERequestContext& ctx);
-    void CreateDirectory(HLERequestContext& ctx);
-    void DeleteDirectory(HLERequestContext& ctx);
-    void DeleteDirectoryRecursively(HLERequestContext& ctx);
-    void CleanDirectoryRecursively(HLERequestContext& ctx);
-    void RenameFile(HLERequestContext& ctx);
-    void OpenFile(HLERequestContext& ctx);
-    void OpenDirectory(HLERequestContext& ctx);
-    void GetEntryType(HLERequestContext& ctx);
-    void Commit(HLERequestContext& ctx);
-    void GetFreeSpaceSize(HLERequestContext& ctx);
-    void GetTotalSpaceSize(HLERequestContext& ctx);
-    void GetFileTimeStampRaw(HLERequestContext& ctx);
-    void GetFileSystemAttribute(HLERequestContext& ctx);
+    explicit IFileSystem(Core::System& system_, FileSys::VirtualDir dir_, SizeGetter size_getter_);
+
+    Result CreateFile(const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path, s32 option,
+                      s64 size);
+    Result DeleteFile(const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result CreateDirectory(const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result DeleteDirectory(const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result DeleteDirectoryRecursively(
+        const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result CleanDirectoryRecursively(
+        const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result RenameFile(const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> old_path,
+                      const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> new_path);
+    Result OpenFile(OutInterface<IFile> out_interface,
+                    const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path, u32 mode);
+    Result OpenDirectory(OutInterface<IDirectory> out_interface,
+                         const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path,
+                         u32 mode);
+    Result GetEntryType(Out<u32> out_type,
+                        const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result Commit();
+    Result GetFreeSpaceSize(Out<s64> out_size,
+                            const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result GetTotalSpaceSize(Out<s64> out_size,
+                             const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result GetFileTimeStampRaw(Out<FileSys::FileTimeStampRaw> out_timestamp,
+                               const InLargeData<FileSys::Sf::Path, BufferAttr_HipcPointer> path);
+    Result GetFileSystemAttribute(Out<FileSys::FileSystemAttribute> out_attribute);
 
 private:
-    VfsDirectoryServiceWrapper backend;
-    SizeGetter size;
+    std::unique_ptr<FileSys::Fsa::IFileSystem> backend;
+    SizeGetter size_getter;
 };
 
 } // namespace Service::FileSystem
diff --git a/src/core/hle/service/psc/ovln/ovln_types.h b/src/core/hle/service/psc/ovln/ovln_types.h
new file mode 100644
index 000000000..343b05dcc
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/ovln_types.h
@@ -0,0 +1,21 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/bit_field.h"
+#include "common/common_types.h"
+
+namespace Service::PSC {
+
+using OverlayNotification = std::array<u64, 0x10>;
+static_assert(sizeof(OverlayNotification) == 0x80, "OverlayNotification has incorrect size");
+
+union MessageFlags {
+    u64 raw;
+    BitField<0, 8, u64> message_type;
+    BitField<8, 8, u64> queue_type;
+};
+static_assert(sizeof(MessageFlags) == 0x8, "MessageFlags has incorrect size");
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/receiver.cpp b/src/core/hle/service/psc/ovln/receiver.cpp
new file mode 100644
index 000000000..85f62816d
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/receiver.cpp
@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/psc/ovln/receiver.h"
+
+namespace Service::PSC {
+
+IReceiver::IReceiver(Core::System& system_) : ServiceFramework{system_, "IReceiver"} {
+    // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, nullptr, "AddSource"},
+            {1, nullptr, "RemoveSource"},
+            {2, nullptr, "GetReceiveEventHandle"},
+            {3, nullptr, "Receive"},
+            {4, nullptr, "ReceiveWithTick"},
+        };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IReceiver::~IReceiver() = default;
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/receiver.h b/src/core/hle/service/psc/ovln/receiver.h
new file mode 100644
index 000000000..c47a4ff7e
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/receiver.h
@@ -0,0 +1,16 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Service::PSC {
+
+class IReceiver final : public ServiceFramework<IReceiver> {
+public:
+    explicit IReceiver(Core::System& system_);
+    ~IReceiver() override;
+};
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/receiver_service.cpp b/src/core/hle/service/psc/ovln/receiver_service.cpp
new file mode 100644
index 000000000..bb988e905
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/receiver_service.cpp
@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/cmif_serialization.h"
+#include "core/hle/service/psc/ovln/receiver.h"
+#include "core/hle/service/psc/ovln/receiver_service.h"
+
+namespace Service::PSC {
+
+IReceiverService::IReceiverService(Core::System& system_) : ServiceFramework{system_, "ovln:rcv"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, D<&IReceiverService::OpenReceiver>, "OpenReceiver"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IReceiverService::~IReceiverService() = default;
+
+Result IReceiverService::OpenReceiver(Out<SharedPointer<IReceiver>> out_receiver) {
+    LOG_DEBUG(Service_PSC, "called");
+    *out_receiver = std::make_shared<IReceiver>(system);
+    R_SUCCEED();
+}
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/receiver_service.h b/src/core/hle/service/psc/ovln/receiver_service.h
new file mode 100644
index 000000000..b3b31ba4a
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/receiver_service.h
@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/cmif_types.h"
+#include "core/hle/service/service.h"
+
+namespace Service::PSC {
+
+class IReceiver;
+
+class IReceiverService final : public ServiceFramework<IReceiverService> {
+public:
+    explicit IReceiverService(Core::System& system_);
+    ~IReceiverService() override;
+
+private:
+    Result OpenReceiver(Out<SharedPointer<IReceiver>> out_receiver);
+};
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/sender.cpp b/src/core/hle/service/psc/ovln/sender.cpp
new file mode 100644
index 000000000..3227a56f2
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/sender.cpp
@@ -0,0 +1,32 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/cmif_serialization.h"
+#include "core/hle/service/psc/ovln/sender.h"
+
+namespace Service::PSC {
+
+ISender::ISender(Core::System& system_) : ServiceFramework{system_, "ISender"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, D<&ISender::Send>, "Send"},
+        {1, nullptr, "GetUnreceivedMessageCount"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+ISender::~ISender() = default;
+
+Result ISender::Send(const OverlayNotification& notification, MessageFlags flags) {
+    std::string data;
+    for (const auto m : notification) {
+        data += fmt::format("{:016X} ", m);
+    }
+
+    LOG_WARNING(Service_PSC, "(STUBBED) called, flags={} notification={}", flags.raw, data);
+    R_SUCCEED();
+}
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/sender.h b/src/core/hle/service/psc/ovln/sender.h
new file mode 100644
index 000000000..c1575428e
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/sender.h
@@ -0,0 +1,21 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/cmif_types.h"
+#include "core/hle/service/psc/ovln/ovln_types.h"
+#include "core/hle/service/service.h"
+
+namespace Service::PSC {
+
+class ISender final : public ServiceFramework<ISender> {
+public:
+    explicit ISender(Core::System& system_);
+    ~ISender() override;
+
+private:
+    Result Send(const OverlayNotification& notification, MessageFlags flags);
+};
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/sender_service.cpp b/src/core/hle/service/psc/ovln/sender_service.cpp
new file mode 100644
index 000000000..18d2c83a3
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/sender_service.cpp
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/cmif_serialization.h"
+#include "core/hle/service/psc/ovln/sender.h"
+#include "core/hle/service/psc/ovln/sender_service.h"
+
+namespace Service::PSC {
+
+ISenderService::ISenderService(Core::System& system_) : ServiceFramework{system_, "ovln:snd"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, D<&ISenderService::OpenSender>, "OpenSender"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+ISenderService::~ISenderService() = default;
+
+Result ISenderService::OpenSender(Out<SharedPointer<ISender>> out_sender, u32 sender_id,
+                                  std::array<u64, 2> data) {
+    LOG_WARNING(Service_PSC, "(STUBBED) called, sender_id={}, data={:016X} {:016X}", sender_id,
+                data[0], data[1]);
+    *out_sender = std::make_shared<ISender>(system);
+    R_SUCCEED();
+}
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/ovln/sender_service.h b/src/core/hle/service/psc/ovln/sender_service.h
new file mode 100644
index 000000000..10027701f
--- /dev/null
+++ b/src/core/hle/service/psc/ovln/sender_service.h
@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/cmif_types.h"
+#include "core/hle/service/service.h"
+
+namespace Service::PSC {
+
+class ISender;
+
+class ISenderService final : public ServiceFramework<ISenderService> {
+public:
+    explicit ISenderService(Core::System& system_);
+    ~ISenderService() override;
+
+private:
+    Result OpenSender(Out<SharedPointer<ISender>> out_sender, u32 sender_id,
+                      std::array<u64, 2> data);
+};
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/pm_control.cpp b/src/core/hle/service/psc/pm_control.cpp
new file mode 100644
index 000000000..7dedb7662
--- /dev/null
+++ b/src/core/hle/service/psc/pm_control.cpp
@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/psc/pm_control.h"
+
+namespace Service::PSC {
+
+IPmControl::IPmControl(Core::System& system_) : ServiceFramework{system_, "psc:c"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "Initialize"},
+        {1, nullptr, "DispatchRequest"},
+        {2, nullptr, "GetResult"},
+        {3, nullptr, "GetState"},
+        {4, nullptr, "Cancel"},
+        {5, nullptr, "PrintModuleInformation"},
+        {6, nullptr, "GetModuleInformation"},
+        {10, nullptr, "AcquireStateLock"},
+        {11, nullptr, "HasStateLock"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IPmControl::~IPmControl() = default;
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/pm_control.h b/src/core/hle/service/psc/pm_control.h
new file mode 100644
index 000000000..e0ae2f39c
--- /dev/null
+++ b/src/core/hle/service/psc/pm_control.h
@@ -0,0 +1,16 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Service::PSC {
+
+class IPmControl final : public ServiceFramework<IPmControl> {
+public:
+    explicit IPmControl(Core::System& system_);
+    ~IPmControl() override;
+};
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/pm_module.cpp b/src/core/hle/service/psc/pm_module.cpp
new file mode 100644
index 000000000..74dc7ed4e
--- /dev/null
+++ b/src/core/hle/service/psc/pm_module.cpp
@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/psc/pm_module.h"
+
+namespace Service::PSC {
+
+IPmModule::IPmModule(Core::System& system_) : ServiceFramework{system_, "IPmModule"} {
+    // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, nullptr, "Initialize"},
+            {1, nullptr, "GetRequest"},
+            {2, nullptr, "Acknowledge"},
+            {3, nullptr, "Finalize"},
+            {4, nullptr, "AcknowledgeEx"},
+        };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IPmModule::~IPmModule() = default;
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/pm_module.h b/src/core/hle/service/psc/pm_module.h
new file mode 100644
index 000000000..b3a2d2584
--- /dev/null
+++ b/src/core/hle/service/psc/pm_module.h
@@ -0,0 +1,16 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Service::PSC {
+
+class IPmModule final : public ServiceFramework<IPmModule> {
+public:
+    explicit IPmModule(Core::System& system_);
+    ~IPmModule() override;
+};
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/pm_service.cpp b/src/core/hle/service/psc/pm_service.cpp
new file mode 100644
index 000000000..c4e0ad228
--- /dev/null
+++ b/src/core/hle/service/psc/pm_service.cpp
@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/cmif_serialization.h"
+#include "core/hle/service/psc/pm_module.h"
+#include "core/hle/service/psc/pm_service.h"
+
+namespace Service::PSC {
+
+IPmService::IPmService(Core::System& system_) : ServiceFramework{system_, "psc:m"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, D<&IPmService::GetPmModule>, "GetPmModule"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IPmService::~IPmService() = default;
+
+Result IPmService::GetPmModule(Out<SharedPointer<IPmModule>> out_module) {
+    LOG_DEBUG(Service_PSC, "called");
+    *out_module = std::make_shared<IPmModule>(system);
+    R_SUCCEED();
+}
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/pm_service.h b/src/core/hle/service/psc/pm_service.h
new file mode 100644
index 000000000..08e14c6f8
--- /dev/null
+++ b/src/core/hle/service/psc/pm_service.h
@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/cmif_types.h"
+#include "core/hle/service/service.h"
+
+namespace Service::PSC {
+
+class IPmModule;
+
+class IPmService final : public ServiceFramework<IPmService> {
+public:
+    explicit IPmService(Core::System& system_);
+    ~IPmService() override;
+
+private:
+    Result GetPmModule(Out<SharedPointer<IPmModule>> out_module);
+};
+
+} // namespace Service::PSC
diff --git a/src/core/hle/service/psc/psc.cpp b/src/core/hle/service/psc/psc.cpp
index 44310756b..e1762d694 100644
--- a/src/core/hle/service/psc/psc.cpp
+++ b/src/core/hle/service/psc/psc.cpp
@@ -1,11 +1,10 @@
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include <memory>
-
-#include "common/logging/log.h"
-#include "core/core.h"
-#include "core/hle/service/ipc_helpers.h"
+#include "core/hle/service/psc/ovln/receiver_service.h"
+#include "core/hle/service/psc/ovln/sender_service.h"
+#include "core/hle/service/psc/pm_control.h"
+#include "core/hle/service/psc/pm_service.h"
 #include "core/hle/service/psc/psc.h"
 #include "core/hle/service/psc/time/manager.h"
 #include "core/hle/service/psc/time/power_state_service.h"
@@ -15,71 +14,13 @@
 
 namespace Service::PSC {
 
-class IPmControl final : public ServiceFramework<IPmControl> {
-public:
-    explicit IPmControl(Core::System& system_) : ServiceFramework{system_, "psc:c"} {
-        // clang-format off
-        static const FunctionInfo functions[] = {
-            {0, nullptr, "Initialize"},
-            {1, nullptr, "DispatchRequest"},
-            {2, nullptr, "GetResult"},
-            {3, nullptr, "GetState"},
-            {4, nullptr, "Cancel"},
-            {5, nullptr, "PrintModuleInformation"},
-            {6, nullptr, "GetModuleInformation"},
-            {10, nullptr, "AcquireStateLock"},
-            {11, nullptr, "HasStateLock"},
-        };
-        // clang-format on
-
-        RegisterHandlers(functions);
-    }
-};
-
-class IPmModule final : public ServiceFramework<IPmModule> {
-public:
-    explicit IPmModule(Core::System& system_) : ServiceFramework{system_, "IPmModule"} {
-        // clang-format off
-        static const FunctionInfo functions[] = {
-            {0, nullptr, "Initialize"},
-            {1, nullptr, "GetRequest"},
-            {2, nullptr, "Acknowledge"},
-            {3, nullptr, "Finalize"},
-            {4, nullptr, "AcknowledgeEx"},
-        };
-        // clang-format on
-
-        RegisterHandlers(functions);
-    }
-};
-
-class IPmService final : public ServiceFramework<IPmService> {
-public:
-    explicit IPmService(Core::System& system_) : ServiceFramework{system_, "psc:m"} {
-        // clang-format off
-        static const FunctionInfo functions[] = {
-            {0, &IPmService::GetPmModule, "GetPmModule"},
-        };
-        // clang-format on
-
-        RegisterHandlers(functions);
-    }
-
-private:
-    void GetPmModule(HLERequestContext& ctx) {
-        LOG_DEBUG(Service_PSC, "called");
-
-        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-        rb.Push(ResultSuccess);
-        rb.PushIpcInterface<IPmModule>(system);
-    }
-};
-
 void LoopProcess(Core::System& system) {
     auto server_manager = std::make_unique<ServerManager>(system);
 
     server_manager->RegisterNamedService("psc:c", std::make_shared<IPmControl>(system));
     server_manager->RegisterNamedService("psc:m", std::make_shared<IPmService>(system));
+    server_manager->RegisterNamedService("ovln:rcv", std::make_shared<IReceiverService>(system));
+    server_manager->RegisterNamedService("ovln:snd", std::make_shared<ISenderService>(system));
 
     auto time = std::make_shared<Time::TimeManager>(system);
 
diff --git a/src/core/hle/service/psc/psc.h b/src/core/hle/service/psc/psc.h
index 459137f42..c83d07ca8 100644
--- a/src/core/hle/service/psc/psc.h
+++ b/src/core/hle/service/psc/psc.h
@@ -7,10 +7,6 @@ namespace Core {
 class System;
 }
 
-namespace Service::SM {
-class ServiceManager;
-}
-
 namespace Service::PSC {
 
 void LoopProcess(Core::System& system);
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv.cpp b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
index 0031fa5fb..3f9698d6b 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
@@ -261,7 +261,9 @@ void DefineEntryPoint(const IR::Program& program, EmitContext& ctx, Id main) {
     case Stage::Geometry:
         execution_model = spv::ExecutionModel::Geometry;
         ctx.AddCapability(spv::Capability::Geometry);
-        ctx.AddCapability(spv::Capability::GeometryStreams);
+        if (ctx.profile.support_geometry_streams) {
+            ctx.AddCapability(spv::Capability::GeometryStreams);
+        }
         switch (ctx.runtime_info.input_topology) {
         case InputTopology::Points:
             ctx.AddExecutionMode(main, spv::ExecutionMode::InputPoints);
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_special.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_special.cpp
index 9f7b6bb4b..f60da758e 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_special.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_special.cpp
@@ -129,7 +129,9 @@ void EmitEmitVertex(EmitContext& ctx, const IR::Value& stream) {
     if (ctx.runtime_info.convert_depth_mode && !ctx.profile.support_native_ndc) {
         ConvertDepthMode(ctx);
     }
-    if (stream.IsImmediate()) {
+    if (!ctx.profile.support_geometry_streams) {
+        throw NotImplementedException("Geometry streams");
+    } else if (stream.IsImmediate()) {
         ctx.OpEmitStreamVertex(ctx.Def(stream));
     } else {
         LOG_WARNING(Shader_SPIRV, "Stream is not immediate");
@@ -140,7 +142,9 @@ void EmitEmitVertex(EmitContext& ctx, const IR::Value& stream) {
 }
 
 void EmitEndPrimitive(EmitContext& ctx, const IR::Value& stream) {
-    if (stream.IsImmediate()) {
+    if (!ctx.profile.support_geometry_streams) {
+        throw NotImplementedException("Geometry streams");
+    } else if (stream.IsImmediate()) {
         ctx.OpEndStreamPrimitive(ctx.Def(stream));
     } else {
         LOG_WARNING(Shader_SPIRV, "Stream is not immediate");
diff --git a/src/shader_recompiler/profile.h b/src/shader_recompiler/profile.h
index 7578d41cc..90e46bb1b 100644
--- a/src/shader_recompiler/profile.h
+++ b/src/shader_recompiler/profile.h
@@ -44,6 +44,7 @@ struct Profile {
     bool support_gl_derivative_control{};
     bool support_scaled_attributes{};
     bool support_multi_viewport{};
+    bool support_geometry_streams{};
 
     bool warp_size_potentially_larger_than_guest{};
 
diff --git a/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp b/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
index 20f7a9702..d34b585d6 100644
--- a/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
+++ b/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
@@ -352,6 +352,7 @@ PipelineCache::PipelineCache(Tegra::MaxwellDeviceMemoryManager& device_memory_,
         .support_native_ndc = device.IsExtDepthClipControlSupported(),
         .support_scaled_attributes = !device.MustEmulateScaledFormats(),
         .support_multi_viewport = device.SupportsMultiViewport(),
+        .support_geometry_streams = device.AreTransformFeedbackGeometryStreamsSupported(),
 
         .warp_size_potentially_larger_than_guest = device.IsWarpSizePotentiallyBiggerThanGuest(),
 
diff --git a/src/video_core/vulkan_common/vulkan_device.cpp b/src/video_core/vulkan_common/vulkan_device.cpp
index d7216d349..b94924a58 100644
--- a/src/video_core/vulkan_common/vulkan_device.cpp
+++ b/src/video_core/vulkan_common/vulkan_device.cpp
@@ -1297,10 +1297,6 @@ u64 Device::GetDeviceMemoryUsage() const {
 }
 
 void Device::CollectPhysicalMemoryInfo() {
-    // Account for resolution scaling in memory limits
-    const size_t normal_memory = 6_GiB;
-    const size_t scaler_memory = 1_GiB * Settings::values.resolution_info.ScaleUp(1);
-
     // Calculate limits using memory budget
     VkPhysicalDeviceMemoryBudgetPropertiesEXT budget{};
     budget.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MEMORY_BUDGET_PROPERTIES_EXT;
@@ -1331,7 +1327,15 @@ void Device::CollectPhysicalMemoryInfo() {
     if (!is_integrated) {
         const u64 reserve_memory = std::min<u64>(device_access_memory / 8, 1_GiB);
         device_access_memory -= reserve_memory;
-        device_access_memory = std::min<u64>(device_access_memory, normal_memory + scaler_memory);
+
+        if (Settings::values.vram_usage_mode.GetValue() != Settings::VramUsageMode::Aggressive) {
+            // Account for resolution scaling in memory limits
+            const size_t normal_memory = 6_GiB;
+            const size_t scaler_memory = 1_GiB * Settings::values.resolution_info.ScaleUp(1);
+            device_access_memory =
+                std::min<u64>(device_access_memory, normal_memory + scaler_memory);
+        }
+
         return;
     }
     const s64 available_memory = static_cast<s64>(device_access_memory - device_initial_usage);
diff --git a/src/video_core/vulkan_common/vulkan_device.h b/src/video_core/vulkan_common/vulkan_device.h
index a2ec26697..e3abe8ddf 100644
--- a/src/video_core/vulkan_common/vulkan_device.h
+++ b/src/video_core/vulkan_common/vulkan_device.h
@@ -499,6 +499,11 @@ public:
         return extensions.transform_feedback;
     }
 
+    /// Returns true if the device supports VK_EXT_transform_feedback properly.
+    bool AreTransformFeedbackGeometryStreamsSupported() const {
+        return features.transform_feedback.geometryStreams;
+    }
+
     /// Returns true if the device supports VK_EXT_custom_border_color.
     bool IsExtCustomBorderColorSupported() const {
         return extensions.custom_border_color;
diff --git a/src/yuzu/configuration/shared_translation.cpp b/src/yuzu/configuration/shared_translation.cpp
index d138b53c8..0549e8ae4 100644
--- a/src/yuzu/configuration/shared_translation.cpp
+++ b/src/yuzu/configuration/shared_translation.cpp
@@ -164,6 +164,11 @@ std::unique_ptr<TranslationMap> InitializeTranslations(QWidget* parent) {
            "the emulator to decompress to an intermediate format any card supports, RGBA8.\n"
            "This option recompresses RGBA8 to either the BC1 or BC3 format, saving VRAM but "
            "negatively affecting image quality."));
+    INSERT(Settings, vram_usage_mode, tr("VRAM Usage Mode:"),
+           tr("Selects whether the emulator should prefer to conserve memory or make maximum usage "
+              "of available video memory for performance. Has no effect on integrated graphics. "
+              "Aggressive mode may severely impact the performance of other applications such as "
+              "recording software."));
     INSERT(
         Settings, vsync_mode, tr("VSync Mode:"),
         tr("FIFO (VSync) does not drop frames or exhibit tearing but is limited by the screen "
@@ -315,6 +320,11 @@ std::unique_ptr<ComboboxTranslationMap> ComboboxEnumeration(QWidget* parent) {
              PAIR(AstcRecompression, Bc1, tr("BC1 (Low quality)")),
              PAIR(AstcRecompression, Bc3, tr("BC3 (Medium quality)")),
          }});
+    translations->insert({Settings::EnumMetadata<Settings::VramUsageMode>::Index(),
+                          {
+                              PAIR(VramUsageMode, Conservative, tr("Conservative")),
+                              PAIR(VramUsageMode, Aggressive, tr("Aggressive")),
+                          }});
     translations->insert({Settings::EnumMetadata<Settings::RendererBackend>::Index(),
                           {
 #ifdef HAS_OPENGL