Archives: Implemented ExtSaveData and SharedExtSaveData

They will be stored in /extsavedata/SDMC and /extsavedata/NAND respectively.
Also redirect some APT_A functions to their APT_U equivalents.
Implemented the gamecoin.dat file in SharedExtSaveData in the PTM module.
Implemented formatting the savegame.
Retake a previous savegame if it exists instead of reporting them as not formatted every time a game is loaded.

17 files changed, 268 insertions, 60 deletions

diff --git a/src/common/common_paths.h b/src/common/common_paths.h
index 9d62a836..d3f0702b 100644
--- a/src/common/common_paths.h
+++ b/src/common/common_paths.h
@@ -40,6 +40,7 @@
 #define MAPS_DIR          "maps"
 #define CACHE_DIR         "cache"
 #define SDMC_DIR          "sdmc"
+#define EXTSAVEDATA_DIR   "extsavedata"
 #define SAVEDATA_DIR      "savedata"
 #define SYSDATA_DIR       "sysdata"
 #define SYSSAVEDATA_DIR   "syssavedata"
diff --git a/src/common/file_util.cpp b/src/common/file_util.cpp
index bba830c7..c44ad4ca 100644
--- a/src/common/file_util.cpp
+++ b/src/common/file_util.cpp
@@ -676,6 +676,7 @@ const std::string& GetUserPath(const unsigned int DirIDX, const std::string &new
         paths[D_MAPS_IDX]           = paths[D_USER_IDX] + MAPS_DIR DIR_SEP;
         paths[D_CACHE_IDX]          = paths[D_USER_IDX] + CACHE_DIR DIR_SEP;
         paths[D_SDMC_IDX]           = paths[D_USER_IDX] + SDMC_DIR DIR_SEP;
+        paths[D_EXTSAVEDATA]        = paths[D_USER_IDX] + EXTSAVEDATA_DIR DIR_SEP;
         paths[D_SAVEDATA_IDX]       = paths[D_USER_IDX] + SAVEDATA_DIR DIR_SEP;
         paths[D_SYSDATA_IDX]        = paths[D_USER_IDX] + SYSDATA_DIR DIR_SEP;
         paths[D_SYSSAVEDATA_IDX]    = paths[D_USER_IDX] + SYSSAVEDATA_DIR DIR_SEP;
@@ -720,6 +721,7 @@ const std::string& GetUserPath(const unsigned int DirIDX, const std::string &new
             paths[D_MAPS_IDX]           = paths[D_USER_IDX] + MAPS_DIR DIR_SEP;
             paths[D_CACHE_IDX]          = paths[D_USER_IDX] + CACHE_DIR DIR_SEP;
             paths[D_SDMC_IDX]           = paths[D_USER_IDX] + SDMC_DIR DIR_SEP;
+            paths[D_EXTSAVEDATA]        = paths[D_USER_IDX] + EXTSAVEDATA_DIR DIR_SEP;
             paths[D_SAVEDATA_IDX]       = paths[D_USER_IDX] + SAVEDATA_DIR DIR_SEP;
             paths[D_SYSSAVEDATA_IDX]    = paths[D_USER_IDX] + SYSSAVEDATA_DIR DIR_SEP;
             paths[D_SHADERCACHE_IDX]    = paths[D_USER_IDX] + SHADERCACHE_DIR DIR_SEP;
diff --git a/src/common/file_util.h b/src/common/file_util.h
index 293c3094..ec241547 100644
--- a/src/common/file_util.h
+++ b/src/common/file_util.h
@@ -27,6 +27,7 @@ enum {
     D_STATESAVES_IDX,
     D_SCREENSHOTS_IDX,
     D_SDMC_IDX,
+    D_EXTSAVEDATA,
     D_SAVEDATA_IDX,
     D_SYSDATA_IDX,
     D_SYSSAVEDATA_IDX,
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index fdd97c18..89ea70d2 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -17,6 +17,7 @@ set(SRCS
             arm/skyeye_common/vfp/vfpdouble.cpp
             arm/skyeye_common/vfp/vfpinstr.cpp
             arm/skyeye_common/vfp/vfpsingle.cpp
+            file_sys/archive_extsavedata.cpp
             file_sys/archive_romfs.cpp
             file_sys/archive_savedata.cpp
             file_sys/archive_sdmc.cpp
@@ -104,6 +105,7 @@ set(HEADERS
             arm/skyeye_common/vfp/vfp_helper.h
             arm/arm_interface.h
             file_sys/archive_backend.h
+            file_sys/archive_extsavedata.h
             file_sys/archive_romfs.h
             file_sys/archive_savedata.h
             file_sys/archive_sdmc.h
diff --git a/src/core/file_sys/archive_backend.h b/src/core/file_sys/archive_backend.h
index e153917e..1612c35c 100644
--- a/src/core/file_sys/archive_backend.h
+++ b/src/core/file_sys/archive_backend.h
@@ -46,6 +46,9 @@ public:
     Path(const char* path) : type(Char), string(path) {
     }
 
+    Path(std::vector<u8> binary_data) : type(Binary), binary(std::move(binary_data)) {
+    }
+
     Path(LowPathType type, u32 size, u32 pointer) : type(type) {
         switch (type) {
         case Binary:
@@ -175,6 +178,20 @@ public:
     }
 
     /**
+     * Tries to open the archive of this type with the specified path
+     * @param path Path to the archive
+     * @return ResultCode of the operation
+     */
+    virtual ResultCode Open(const Path& path) = 0;
+
+    /**
+     * Deletes the archive contents and then re-creates the base folder
+     * @param path Path to the archive
+     * @return ResultCode of the operation, 0 on success
+     */
+    virtual ResultCode Format(const Path& path) const = 0;
+
+    /**
      * Get a descriptive name for the archive (e.g. "RomFS", "SaveData", etc.)
      */
     virtual std::string GetName() const = 0;
diff --git a/src/core/file_sys/archive_extsavedata.cpp b/src/core/file_sys/archive_extsavedata.cpp
new file mode 100644
index 00000000..4759ef3a
--- /dev/null
+++ b/src/core/file_sys/archive_extsavedata.cpp
@@ -0,0 +1,59 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <sys/stat.h>
+
+#include "common/common_types.h"
+#include "common/file_util.h"
+
+#include "core/file_sys/archive_extsavedata.h"
+#include "core/file_sys/disk_archive.h"
+#include "core/settings.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+static std::string GetExtSaveDataPath(const std::string& mount_point, const Path& path) {
+    std::vector<u8> vec_data = path.AsBinary();
+    const u32* data = reinterpret_cast<const u32*>(vec_data.data());
+    u32 media_type = data[0];
+    u32 save_low = data[1];
+    u32 save_high = data[2];
+    return Common::StringFromFormat("%s%s/%08X/%08X/", mount_point.c_str(), media_type == 0 ? "nand" : "sdmc", save_high, save_low);
+}
+
+Archive_ExtSaveData::Archive_ExtSaveData(const std::string& mount_point)
+        : DiskArchive(mount_point), concrete_mount_point(mount_point) {
+    LOG_INFO(Service_FS, "Directory %s set as base for ExtSaveData.", this->mount_point.c_str());
+}
+
+bool Archive_ExtSaveData::Initialize() {
+    if (!FileUtil::CreateFullPath(mount_point)) {
+        LOG_ERROR(Service_FS, "Unable to create ExtSaveData base path.");
+        return false;
+    }
+
+    return true;
+}
+
+ResultCode Archive_ExtSaveData::Open(const Path& path) {
+    std::string fullpath = GetExtSaveDataPath(mount_point, path);
+    if (!FileUtil::Exists(fullpath)) {
+        // TODO(Subv): Check error code, this one is probably wrong
+        return ResultCode(ErrorDescription::FS_NotFormatted, ErrorModule::FS,
+            ErrorSummary::InvalidState, ErrorLevel::Status);
+    }
+    concrete_mount_point = fullpath;
+    return RESULT_SUCCESS;
+}
+
+ResultCode Archive_ExtSaveData::Format(const Path& path) const {
+    std::string fullpath = GetExtSaveDataPath(mount_point, path);
+    FileUtil::CreateFullPath(fullpath);
+    return RESULT_SUCCESS;
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/archive_extsavedata.h b/src/core/file_sys/archive_extsavedata.h
new file mode 100644
index 00000000..a3a14479
--- /dev/null
+++ b/src/core/file_sys/archive_extsavedata.h
@@ -0,0 +1,45 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+
+#include "core/file_sys/disk_archive.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+/// File system interface to the ExtSaveData archive
+class Archive_ExtSaveData final : public DiskArchive {
+public:
+    Archive_ExtSaveData(const std::string& mount_point);
+
+    /**
+     * Initialize the archive.
+     * @return true if it initialized successfully
+     */
+    bool Initialize();
+
+    ResultCode Open(const Path& path) override;
+    ResultCode Format(const Path& path) const override;
+    std::string GetName() const override { return "ExtSaveData"; }
+
+    const std::string& GetMountPoint() const override {
+        return concrete_mount_point;
+    }
+
+protected:
+    /**
+     * This holds the full directory path for this archive, it is only set after a successful call to Open, 
+     * this is formed as <base extsavedatapath>/<type>/<high>/<low>. 
+     * See GetExtSaveDataPath for the code that extracts this data from an archive path.
+     */
+    std::string concrete_mount_point;
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/archive_romfs.cpp b/src/core/file_sys/archive_romfs.cpp
index fdaf7317..2fc3831b 100644
--- a/src/core/file_sys/archive_romfs.cpp
+++ b/src/core/file_sys/archive_romfs.cpp
@@ -62,4 +62,9 @@ std::unique_ptr<DirectoryBackend> Archive_RomFS::OpenDirectory(const Path& path)
     return Common::make_unique<Directory_RomFS>();
 }
 
+ResultCode Archive_RomFS::Format(const Path& path) const {
+    LOG_WARNING(Service_FS, "Attempted to format ROMFS.");
+    return UnimplementedFunction(ErrorModule::FS);
+}
+
 } // namespace FileSys
diff --git a/src/core/file_sys/archive_romfs.h b/src/core/file_sys/archive_romfs.h
index 5e918f92..d4b1eb7f 100644
--- a/src/core/file_sys/archive_romfs.h
+++ b/src/core/file_sys/archive_romfs.h
@@ -83,6 +83,12 @@ public:
      */
     std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const override;
 
+    ResultCode Open(const Path& path) override {
+        return RESULT_SUCCESS;
+    }
+
+    ResultCode Format(const Path& path) const override;
+
 private:
     friend class File_RomFS;
 
diff --git a/src/core/file_sys/archive_savedata.cpp b/src/core/file_sys/archive_savedata.cpp
index 97853567..280d4ff5 100644
--- a/src/core/file_sys/archive_savedata.cpp
+++ b/src/core/file_sys/archive_savedata.cpp
@@ -16,18 +16,29 @@
 
 namespace FileSys {
 
-Archive_SaveData::Archive_SaveData(const std::string& mount_point, u64 program_id)
-        : DiskArchive(mount_point + Common::StringFromFormat("%016X", program_id) + DIR_SEP) {
+Archive_SaveData::Archive_SaveData(const std::string& mount_point)
+        : DiskArchive(mount_point) {
     LOG_INFO(Service_FS, "Directory %s set as SaveData.", this->mount_point.c_str());
 }
 
-bool Archive_SaveData::Initialize() {
-    if (!FileUtil::CreateFullPath(mount_point)) {
-        LOG_ERROR(Service_FS, "Unable to create SaveData path.");
-        return false;
+ResultCode Archive_SaveData::Open(const Path& path) {
+    if (concrete_mount_point.empty())
+        concrete_mount_point = Common::StringFromFormat("%s%016X", mount_point.c_str(), Kernel::g_program_id) + DIR_SEP;
+    if (!FileUtil::Exists(concrete_mount_point)) {
+        // When a SaveData archive is created for the first time, it is not yet formatted
+        // and the save file/directory structure expected by the game has not yet been initialized. 
+        // Returning the NotFormatted error code will signal the game to provision the SaveData archive 
+        // with the files and folders that it expects. 
+        return ResultCode(ErrorDescription::FS_NotFormatted, ErrorModule::FS,
+            ErrorSummary::InvalidState, ErrorLevel::Status);
     }
+    return RESULT_SUCCESS;
+}
 
-    return true;
+ResultCode Archive_SaveData::Format(const Path& path) const {
+    FileUtil::DeleteDirRecursively(concrete_mount_point);
+    FileUtil::CreateFullPath(concrete_mount_point);
+    return RESULT_SUCCESS;
 }
 
 } // namespace FileSys
diff --git a/src/core/file_sys/archive_savedata.h b/src/core/file_sys/archive_savedata.h
index 5b0ce29e..07c7f7ef 100644
--- a/src/core/file_sys/archive_savedata.h
+++ b/src/core/file_sys/archive_savedata.h
@@ -17,15 +17,20 @@ namespace FileSys {
 /// File system interface to the SaveData archive
 class Archive_SaveData final : public DiskArchive {
 public:
-    Archive_SaveData(const std::string& mount_point, u64 program_id);
-
-    /**
-     * Initialize the archive.
-     * @return true if it initialized successfully
-     */
-    bool Initialize();
+    Archive_SaveData(const std::string& mount_point);
 
     std::string GetName() const override { return "SaveData"; }
+
+    ResultCode Open(const Path& path) override;
+
+    ResultCode Format(const Path& path) const override;
+
+    const std::string& GetMountPoint() const override {
+        return concrete_mount_point;
+    }
+
+protected:
+    std::string concrete_mount_point;
 };
 
 } // namespace FileSys
diff --git a/src/core/file_sys/disk_archive.h b/src/core/file_sys/disk_archive.h
index 018ebd2e..f18d96f5 100644
--- a/src/core/file_sys/disk_archive.h
+++ b/src/core/file_sys/disk_archive.h
@@ -25,6 +25,7 @@ public:
     DiskArchive(const std::string& mount_point_) : mount_point(mount_point_) {}
 
     virtual std::string GetName() const = 0;
+    virtual ResultCode Format(const Path& path) const { return RESULT_SUCCESS; }
     std::unique_ptr<FileBackend> OpenFile(const Path& path, const Mode mode) const override;
     bool DeleteFile(const Path& path) const override;
     bool RenameFile(const Path& src_path, const Path& dest_path) const override;
@@ -34,11 +35,15 @@ public:
     bool RenameDirectory(const Path& src_path, const Path& dest_path) const override;
     std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const override;
 
+    virtual ResultCode Open(const Path& path) override {
+        return RESULT_SUCCESS;
+    }
+
     /**
      * Getter for the path used for this Archive
      * @return Mount point of that passthrough archive
      */
-    const std::string& GetMountPoint() const {
+    virtual const std::string& GetMountPoint() const {
         return mount_point;
     }
 
diff --git a/src/core/hle/service/apt_a.cpp b/src/core/hle/service/apt_a.cpp
index dcf5ec4f..a22f5f15 100644
--- a/src/core/hle/service/apt_a.cpp
+++ b/src/core/hle/service/apt_a.cpp
@@ -6,14 +6,21 @@
 #include "core/hle/hle.h"
 #include "core/hle/service/apt_a.h"
 
+namespace APT_U {
+    extern void Initialize(Service::Interface* self);
+    extern void GetLockHandle(Service::Interface* self);
+    extern void ReceiveParameter(Service::Interface* self);
+    extern void GlanceParameter(Service::Interface* self);
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Namespace APT_A
 
 namespace APT_A {
 
 const Interface::FunctionInfo FunctionTable[] = {
-    {0x00010040, nullptr,               "GetLockHandle?"},
-    {0x00020080, nullptr,               "Initialize?"},
+    {0x00010040, APT_U::GetLockHandle,  "GetLockHandle?"},
+    {0x00020080, APT_U::Initialize,     "Initialize?"},
     {0x00030040, nullptr,               "Enable?"},
     {0x00040040, nullptr,               "Finalize?"},
     {0x00050040, nullptr,               "GetAppletManInfo?"},
@@ -22,6 +29,8 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x00430040, nullptr,               "NotifyToWait?"},
     {0x004B00C2, nullptr,               "AppletUtility?"},
     {0x00550040, nullptr,               "WriteInputToNsState?"},
+    {0x000D0080, APT_U::ReceiveParameter,"ReceiveParameter" },
+    {0x000E0080, APT_U::GlanceParameter,"GlanceParameter" },
 };
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
diff --git a/src/core/hle/service/fs/archive.cpp b/src/core/hle/service/fs/archive.cpp
index 487bf3aa..f19ca3a9 100644
--- a/src/core/hle/service/fs/archive.cpp
+++ b/src/core/hle/service/fs/archive.cpp
@@ -11,6 +11,7 @@
 #include "common/math_util.h"
 
 #include "core/file_sys/archive_savedata.h"
+#include "core/file_sys/archive_extsavedata.h"
 #include "core/file_sys/archive_backend.h"
 #include "core/file_sys/archive_sdmc.h"
 #include "core/file_sys/directory_backend.h"
@@ -224,25 +225,20 @@ static Archive* GetArchive(ArchiveHandle handle) {
     return (itr == handle_map.end()) ? nullptr : itr->second;
 }
 
-ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code) {
+ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code, FileSys::Path& archive_path) {
     LOG_TRACE(Service_FS, "Opening archive with id code 0x%08X", id_code);
 
     auto itr = id_code_map.find(id_code);
     if (itr == id_code_map.end()) {
-        if (id_code == ArchiveIdCode::SaveData) {
-            // When a SaveData archive is created for the first time, it is not yet formatted
-            // and the save file/directory structure expected by the game has not yet been initialized. 
-            // Returning the NotFormatted error code will signal the game to provision the SaveData archive 
-            // with the files and folders that it expects. 
-            // The FormatSaveData service call will create the SaveData archive when it is called.
-            return ResultCode(ErrorDescription::FS_NotFormatted, ErrorModule::FS,
-                              ErrorSummary::InvalidState, ErrorLevel::Status);
-        }
         // TODO: Verify error against hardware
         return ResultCode(ErrorDescription::NotFound, ErrorModule::FS,
                           ErrorSummary::NotFound, ErrorLevel::Permanent);
     }
 
+    ResultCode res = itr->second->backend->Open(archive_path);
+    if (!res.IsSuccess())
+        return res;
+
     // This should never even happen in the first place with 64-bit handles, 
     while (handle_map.count(next_handle) != 0) {
         ++next_handle;
@@ -395,25 +391,14 @@ ResultVal<Handle> OpenDirectoryFromArchive(ArchiveHandle archive_handle, const F
 }
 
 ResultCode FormatSaveData() {
-    // TODO(Subv): Actually wipe the savedata folder after creating or opening it
-
     // Do not create the archive again if it already exists
-    if (id_code_map.find(ArchiveIdCode::SaveData) != id_code_map.end())
-        return UnimplementedFunction(ErrorModule::FS); // TODO(Subv): Find the correct error code
-
-    // Create the SaveData archive
-    std::string savedata_directory = FileUtil::GetUserPath(D_SAVEDATA_IDX);
-    auto savedata_archive = Common::make_unique<FileSys::Archive_SaveData>(savedata_directory,
-        Kernel::g_program_id);
-
-    if (savedata_archive->Initialize()) {
-        CreateArchive(std::move(savedata_archive), ArchiveIdCode::SaveData);
-        return RESULT_SUCCESS;
-    } else {
-        LOG_ERROR(Service_FS, "Can't instantiate SaveData archive with path %s",
-            savedata_archive->GetMountPoint().c_str());
-        return UnimplementedFunction(ErrorModule::FS); // TODO(Subv): Find the proper error code
+    auto archive_itr = id_code_map.find(ArchiveIdCode::SaveData);
+    if (archive_itr == id_code_map.end()) {
+        return UnimplementedFunction(ErrorModule::FS); // TODO(Subv): Find the right error
     }
+
+    // Use an empty path, we do not use it when formatting the savedata
+    return archive_itr->second->backend->Format(FileSys::Path());
 }
 
 /// Initialize archives
@@ -430,6 +415,26 @@ void ArchiveInit() {
         CreateArchive(std::move(sdmc_archive), ArchiveIdCode::SDMC);
     else
         LOG_ERROR(Service_FS, "Can't instantiate SDMC archive with path %s", sdmc_directory.c_str());
+    
+    // Create the SaveData archive
+    std::string savedata_directory = FileUtil::GetUserPath(D_SAVEDATA_IDX);
+    auto savedata_archive = Common::make_unique<FileSys::Archive_SaveData>(savedata_directory);
+    CreateArchive(std::move(savedata_archive), ArchiveIdCode::SaveData);
+
+    std::string extsavedata_directory = FileUtil::GetUserPath(D_EXTSAVEDATA);
+    auto extsavedata_archive = Common::make_unique<FileSys::Archive_ExtSaveData>(extsavedata_directory);
+    if (extsavedata_archive->Initialize())
+        CreateArchive(std::move(extsavedata_archive), ArchiveIdCode::ExtSaveData);
+    else
+        LOG_ERROR(Service_FS, "Can't instantiate ExtSaveData archive with path %s", extsavedata_directory.c_str());
+
+    std::string sharedextsavedata_directory = FileUtil::GetUserPath(D_EXTSAVEDATA);
+    auto sharedextsavedata_archive = Common::make_unique<FileSys::Archive_ExtSaveData>(sharedextsavedata_directory);
+    if (sharedextsavedata_archive->Initialize())
+        CreateArchive(std::move(sharedextsavedata_archive), ArchiveIdCode::SharedExtSaveData);
+    else
+        LOG_ERROR(Service_FS, "Can't instantiate SharedExtSaveData archive with path %s", 
+                  sharedextsavedata_directory.c_str());
 }
 
 /// Shutdown archives
diff --git a/src/core/hle/service/fs/archive.h b/src/core/hle/service/fs/archive.h
index b39bc41b..c23b8cc4 100644
--- a/src/core/hle/service/fs/archive.h
+++ b/src/core/hle/service/fs/archive.h
@@ -29,9 +29,10 @@ typedef u64 ArchiveHandle;
 /**
  * Opens an archive
  * @param id_code IdCode of the archive to open
+ * @param archive_path Path to the archive, used with Binary paths
  * @return Handle to the opened archive
  */
-ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code);
+ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code, FileSys::Path& archive_path);
 
 /**
  * Closes an archive
diff --git a/src/core/hle/service/fs/fs_user.cpp b/src/core/hle/service/fs/fs_user.cpp
index b1a46527..7eb32146 100644
--- a/src/core/hle/service/fs/fs_user.cpp
+++ b/src/core/hle/service/fs/fs_user.cpp
@@ -107,14 +107,7 @@ static void OpenFileDirectly(Service::Interface* self) {
     LOG_DEBUG(Service_FS, "archive_path=%s file_path=%s, mode=%u attributes=%d",
               archive_path.DebugStr().c_str(), file_path.DebugStr().c_str(), mode.hex, attributes);
 
-    if (archive_path.GetType() != FileSys::Empty) {
-        LOG_ERROR(Service_FS, "archive LowPath type other than empty is currently unsupported");
-        cmd_buff[1] = UnimplementedFunction(ErrorModule::FS).raw;
-        cmd_buff[3] = 0;
-        return;
-    }
-
-    ResultVal<ArchiveHandle> archive_handle = OpenArchive(archive_id);
+    ResultVal<ArchiveHandle> archive_handle = OpenArchive(archive_id, archive_path);
     if (archive_handle.Failed()) {
         LOG_ERROR(Service_FS, "failed to get a handle for archive");
         cmd_buff[1] = archive_handle.Code().raw;
@@ -376,13 +369,7 @@ static void OpenArchive(Service::Interface* self) {
 
     LOG_DEBUG(Service_FS, "archive_path=%s", archive_path.DebugStr().c_str());
 
-    if (archive_path.GetType() != FileSys::Empty) {
-        LOG_ERROR(Service_FS, "archive LowPath type other than empty is currently unsupported");
-        cmd_buff[1] = UnimplementedFunction(ErrorModule::FS).raw;
-        return;
-    }
-
-    ResultVal<ArchiveHandle> handle = OpenArchive(archive_id);
+    ResultVal<ArchiveHandle> handle = OpenArchive(archive_id, archive_path);
     cmd_buff[1] = handle.Code().raw;
     if (handle.Succeeded()) {
         cmd_buff[2] = *handle & 0xFFFFFFFF;
diff --git a/src/core/hle/service/ptm_u.cpp b/src/core/hle/service/ptm_u.cpp
index d1498f05..9cc700c4 100644
--- a/src/core/hle/service/ptm_u.cpp
+++ b/src/core/hle/service/ptm_u.cpp
@@ -3,6 +3,8 @@
 // Refer to the license.txt file included.
 
 #include "common/log.h"
+#include "common/make_unique.h"
+#include "core/file_sys/archive_extsavedata.h"
 #include "core/hle/hle.h"
 #include "core/hle/service/ptm_u.h"
 
@@ -11,6 +13,24 @@
 
 namespace PTM_U {
 
+/** 
+ * Represents the gamecoin file structure in the SharedExtData archive
+ * More information in 3dbrew (http://www.3dbrew.org/wiki/Extdata#Shared_Extdata_0xf000000b_gamecoin.dat)
+ */
+struct GameCoin {
+    u32 magic; ///< Magic number: 0x4F00
+    u16 total_coins; ///< Total Play Coins 
+    u16 total_coins_on_date; ///< Total Play Coins obtained on the date stored below.
+    u32 step_count; ///< Total step count at the time a new Play Coin was obtained. 
+    u32 last_step_count; ///< Step count for the day the last Play Coin was obtained
+    u16 year;
+    u8 month;
+    u8 day;
+};
+static const GameCoin default_game_coin = { 0x4F00, 42, 0, 0, 0, 2014, 12, 29 };
+static std::unique_ptr<FileSys::Archive_ExtSaveData> ptm_shared_extsavedata;
+static const std::vector<u8> ptm_shared_extdata_id = {0, 0, 0, 0, 0x0B, 0, 0, 0xF0, 0, 0, 0, 0};
+
 /// Charge levels used by PTM functions
 enum class ChargeLevels : u32 {
     CriticalBattery    = 1,
@@ -120,6 +140,33 @@ const Interface::FunctionInfo FunctionTable[] = {
 
 Interface::Interface() {
     Register(FunctionTable, ARRAY_SIZE(FunctionTable));
+    // Create the SharedExtSaveData archive 0xF000000B and the gamecoin.dat file
+    // TODO(Subv): In the future we should use the FS service to query this archive
+    std::string extsavedata_directory = FileUtil::GetUserPath(D_EXTSAVEDATA);
+    ptm_shared_extsavedata = Common::make_unique<FileSys::Archive_ExtSaveData>(extsavedata_directory);
+    if (!ptm_shared_extsavedata->Initialize()) {
+        LOG_CRITICAL(Service_PTM, "Could not initialize ExtSaveData archive for the PTM:U service");
+        return;
+    }
+    FileSys::Path archive_path(ptm_shared_extdata_id);
+    ResultCode result = ptm_shared_extsavedata->Open(archive_path);
+    // If the archive didn't exist, create the files inside
+    if (result.description == ErrorDescription::FS_NotFormatted) {
+        // Format the archive to clear the directories
+        ptm_shared_extsavedata->Format(archive_path);
+        // Open it again to get a valid archive now that the folder exists
+        ptm_shared_extsavedata->Open(archive_path);
+        FileSys::Path gamecoin_path("gamecoin.dat");
+        FileSys::Mode open_mode = {};
+        open_mode.write_flag = 1;
+        open_mode.create_flag = 1;
+        // Open the file and write the default gamecoin information
+        auto gamecoin = ptm_shared_extsavedata->OpenFile(gamecoin_path, open_mode);
+        if (gamecoin != nullptr) {
+            gamecoin->Write(0, sizeof(GameCoin), 1, reinterpret_cast<const u8*>(&default_game_coin));
+            gamecoin->Close();
+        }
+    }
 }
 
 } // namespace