6 files changed, 128 insertions, 3 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 8ccb2d5f0..3f855dcb7 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -68,6 +68,8 @@ add_library(core STATIC
     file_sys/system_archive/ng_word.h
     file_sys/system_archive/system_archive.cpp
     file_sys/system_archive/system_archive.h
+    file_sys/system_archive/system_version.cpp
+    file_sys/system_archive/system_version.h
     file_sys/vfs.cpp
     file_sys/vfs.h
     file_sys/vfs_concat.cpp
diff --git a/src/core/file_sys/system_archive/system_archive.cpp b/src/core/file_sys/system_archive/system_archive.cpp
index e3e79f40a..c9722ed77 100644
--- a/src/core/file_sys/system_archive/system_archive.cpp
+++ b/src/core/file_sys/system_archive/system_archive.cpp
@@ -6,6 +6,7 @@
 #include "core/file_sys/romfs.h"
 #include "core/file_sys/system_archive/ng_word.h"
 #include "core/file_sys/system_archive/system_archive.h"
+#include "core/file_sys/system_archive/system_version.h"
 
 namespace FileSys::SystemArchive {
 
@@ -30,7 +31,7 @@ constexpr std::array<SystemArchiveDescriptor, SYSTEM_ARCHIVE_COUNT> SYSTEM_ARCHI
     {0x0100000000000806, "NgWord", &NgWord1},
     {0x0100000000000807, "SsidList", nullptr},
     {0x0100000000000808, "Dictionary", nullptr},
-    {0x0100000000000809, "SystemVersion", nullptr},
+    {0x0100000000000809, "SystemVersion", &SystemVersion},
     {0x010000000000080A, "AvatarImage", nullptr},
     {0x010000000000080B, "LocalNews", nullptr},
     {0x010000000000080C, "Eula", nullptr},
diff --git a/src/core/file_sys/system_archive/system_version.cpp b/src/core/file_sys/system_archive/system_version.cpp
new file mode 100644
index 000000000..3fc5f9586
--- /dev/null
+++ b/src/core/file_sys/system_archive/system_version.cpp
@@ -0,0 +1,48 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/file_sys/system_archive/system_version.h"
+#include "core/file_sys/vfs_vector.h"
+
+namespace FileSys::SystemArchive {
+
+namespace SystemVersionData {
+
+// This section should reflect the best system version to describe yuzu's HLE api.
+// TODO(DarkLordZach): Update when HLE gets better.
+
+constexpr u8 VERSION_MAJOR = 5;
+constexpr u8 VERSION_MINOR = 1;
+constexpr u8 VERSION_MICRO = 0;
+
+constexpr u8 REVISION_MAJOR = 0;
+constexpr u8 REVISION_MINOR = 0;
+
+constexpr char PLATFORM_STRING[] = "YUZU";
+constexpr char VERSION_HASH[] = "";
+constexpr char DISPLAY_VERSION[] = "5.1.0";
+constexpr char DISPLAY_TITLE[] = "YuzuEmulated Firmware for NX 5.1.0-0.0";
+
+} // namespace SystemVersionData
+
+VirtualDir SystemVersion() {
+    VirtualFile file = std::make_shared<VectorVfsFile>(std::vector<u8>(0x100), "file");
+    file->WriteObject(SystemVersionData::VERSION_MAJOR, 0);
+    file->WriteObject(SystemVersionData::VERSION_MINOR, 1);
+    file->WriteObject(SystemVersionData::VERSION_MICRO, 2);
+    file->WriteObject(SystemVersionData::REVISION_MAJOR, 4);
+    file->WriteObject(SystemVersionData::REVISION_MINOR, 5);
+    file->WriteArray(SystemVersionData::PLATFORM_STRING,
+                     std::min(sizeof(SystemVersionData::PLATFORM_STRING), 0x20ull), 0x8);
+    file->WriteArray(SystemVersionData::VERSION_HASH,
+                     std::min(sizeof(SystemVersionData::VERSION_HASH), 0x40ull), 0x28);
+    file->WriteArray(SystemVersionData::DISPLAY_VERSION,
+                     std::min(sizeof(SystemVersionData::DISPLAY_VERSION), 0x18ull), 0x68);
+    file->WriteArray(SystemVersionData::DISPLAY_TITLE,
+                     std::min(sizeof(SystemVersionData::DISPLAY_TITLE), 0x80ull), 0x80);
+    return std::make_shared<VectorVfsDirectory>(std::vector<VirtualFile>{file},
+                                                std::vector<VirtualDir>{}, "data");
+}
+
+} // namespace FileSys::SystemArchive
diff --git a/src/core/file_sys/system_archive/system_version.h b/src/core/file_sys/system_archive/system_version.h
new file mode 100644
index 000000000..9fb794b36
--- /dev/null
+++ b/src/core/file_sys/system_archive/system_version.h
@@ -0,0 +1,13 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/file_sys/vfs_types.h"
+
+namespace FileSys::SystemArchive {
+
+VirtualDir SystemVersion();
+
+} // namespace FileSys::SystemArchive
diff --git a/src/core/hle/service/set/set_sys.cpp b/src/core/hle/service/set/set_sys.cpp
index c9b4da5b0..ddab0e36f 100644
--- a/src/core/hle/service/set/set_sys.cpp
+++ b/src/core/hle/service/set/set_sys.cpp
@@ -3,12 +3,71 @@
 // Refer to the license.txt file included.
 
 #include "common/logging/log.h"
+#include "core/file_sys/system_archive/system_version.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/client_port.h"
+#include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/set/set_sys.h"
 
 namespace Service::Set {
 
+void SET_SYS::GetFirmwareVersion(Kernel::HLERequestContext& ctx) {
+    LOG_DEBUG(Service_SET, "called");
+
+    ASSERT(ctx.GetWriteBufferSize() == 0x100,
+           "FirmwareVersion output buffer must be 0x100 bytes in size!");
+
+    // Instead of using the normal procedure of checking for the real system archive and if it
+    // doesn't exist, synthesizing one, I feel that that would lead to strange bugs because a used
+    // is using a really old or really new SystemVersion title. The synthesized one ensures
+    // consistence (currently reports as 5.1.0-0.0)
+    const auto archive = FileSys::SystemArchive::SystemVersion();
+
+    const auto early_exit_failure = [&ctx](const std::string& desc) {
+        LOG_ERROR(Service_SET, "General failure while attempting to resolve firmware version ({}).",
+                  desc.c_str());
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultCode(-1));
+    };
+
+    if (archive == nullptr) {
+        early_exit_failure("The system version archive couldn't be synthesized.");
+        return;
+    }
+
+    const auto ver_file = archive->GetFile("file");
+    if (ver_file == nullptr) {
+        early_exit_failure("The system version archive didn't contain the file 'file'.");
+        return;
+    }
+
+    auto data = ver_file->ReadAllBytes();
+    if (data.size() != 0x100) {
+        early_exit_failure("The system version file 'file' was not the correct size.");
+        return;
+    }
+
+    // If the command is GetFirmwareVersion (as opposed to GetFirmwareVersion2), hardware will zero
+    // out the REVISION_MAJOR and REVISION_MICRO fields, which are u8s at offsets 0x4 and 0x5,
+    // respectively. This if statement will only execute when the true intended command is
+    // GetFirmwareVersion, and allows removing duplicate code for the implementation of
+    // GetFirmwareVersion2.
+    if (ctx.GetCommand() == 3) {
+        data[0x4] = 0x0;
+        data[0x5] = 0x0;
+    }
+
+    ctx.WriteBuffer(data);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+}
+
+void SET_SYS::GetFirmwareVersion2(Kernel::HLERequestContext& ctx) {
+    LOG_WARNING(Service_SET, "called - delegating to GetFirmwareVersion");
+    GetFirmwareVersion(ctx);
+}
+
 void SET_SYS::GetColorSetId(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_SET, "called");
 
@@ -33,8 +92,8 @@ SET_SYS::SET_SYS() : ServiceFramework("set:sys") {
         {0, nullptr, "SetLanguageCode"},
         {1, nullptr, "SetNetworkSettings"},
         {2, nullptr, "GetNetworkSettings"},
-        {3, nullptr, "GetFirmwareVersion"},
-        {4, nullptr, "GetFirmwareVersion2"},
+        {3, &SET_SYS::GetFirmwareVersion, "GetFirmwareVersion"},
+        {4, &SET_SYS::GetFirmwareVersion2, "GetFirmwareVersion2"},
         {5, nullptr, "GetFirmwareVersionDigest"},
         {7, nullptr, "GetLockScreenFlag"},
         {8, nullptr, "SetLockScreenFlag"},
diff --git a/src/core/hle/service/set/set_sys.h b/src/core/hle/service/set/set_sys.h
index f602f3c77..13ee2cf46 100644
--- a/src/core/hle/service/set/set_sys.h
+++ b/src/core/hle/service/set/set_sys.h
@@ -20,6 +20,8 @@ private:
         BasicBlack = 1,
     };
 
+    void GetFirmwareVersion(Kernel::HLERequestContext& ctx);
+    void GetFirmwareVersion2(Kernel::HLERequestContext& ctx);
     void GetColorSetId(Kernel::HLERequestContext& ctx);
     void SetColorSetId(Kernel::HLERequestContext& ctx);