diff --git a/src/xenia/base/clock_posix.cc b/src/xenia/base/clock_posix.cc
index 73a23dc76..f5e2f6805 100644
--- a/src/xenia/base/clock_posix.cc
+++ b/src/xenia/base/clock_posix.cc
@@ -53,4 +53,7 @@ uint64_t Clock::QueryHostUptimeMillis() {
   return host_tick_count_platform() * 1000 / host_tick_frequency_platform();
 }
 
+uint64_t Clock::QueryHostInterruptTime() {
+  return host_tick_count_platform();
+}
 }  // namespace xe
diff --git a/src/xenia/base/filesystem.cc b/src/xenia/base/filesystem.cc
index d7b7b647d..b3515e9cc 100644
--- a/src/xenia/base/filesystem.cc
+++ b/src/xenia/base/filesystem.cc
@@ -24,5 +24,28 @@ bool CreateParentFolder(const std::filesystem::path& path) {
   return true;
 }
 
+std::vector<FileInfo> ListDirectories(const std::filesystem::path& path) {
+  std::vector<FileInfo> files = ListFiles(path);
+  std::vector<FileInfo> directories = {};
+
+  std::copy_if(
+    files.cbegin(), files.cend(), std::back_inserter(directories),
+    [](const FileInfo& file) { return file.type == FileInfo::Type::kDirectory; });
+
+  return std::move(directories);
+}
+
+std::vector<FileInfo> FilterByName(const std::vector<FileInfo>& files,
+                                   const std::regex pattern) {
+  std::vector<FileInfo> filtered_entries = {};
+
+  std::copy_if(files.cbegin(), files.cend(),
+    std::back_inserter(filtered_entries), [pattern](const FileInfo& file) {
+      return std::regex_match(file.name.filename().string(),
+        pattern);
+  });
+  return std::move(filtered_entries);
+}
+
 }  // namespace filesystem
 }  // namespace xe
diff --git a/src/xenia/base/filesystem_posix.cc b/src/xenia/base/filesystem_posix.cc
index 73b06271c..e3addec4b 100644
--- a/src/xenia/base/filesystem_posix.cc
+++ b/src/xenia/base/filesystem_posix.cc
@@ -192,20 +192,27 @@ std::unique_ptr<FileHandle> FileHandle::OpenExisting(
   return std::make_unique<PosixFileHandle>(path, handle);
 }
 
-bool GetInfo(const std::filesystem::path& path, FileInfo* out_info) {
+std::optional<FileInfo> GetInfo(const std::filesystem::path& path) {
+  FileInfo info{};
   struct stat st;
   if (stat(path.c_str(), &st) == 0) {
     if (S_ISDIR(st.st_mode)) {
-      out_info->type = FileInfo::Type::kDirectory;
+      info.type = FileInfo::Type::kDirectory;
+      // On Linux st.st_size can have non-zero size (generally 4096) so make 0
+      info.total_size = 0;
     } else {
-      out_info->type = FileInfo::Type::kFile;
+      info.type = FileInfo::Type::kFile;
+      info.total_size = st.st_size;
+
     }
-    out_info->create_timestamp = convertUnixtimeToWinFiletime(st.st_ctime);
-    out_info->access_timestamp = convertUnixtimeToWinFiletime(st.st_atime);
-    out_info->write_timestamp = convertUnixtimeToWinFiletime(st.st_mtime);
-    return true;
+    info.path = path.parent_path();
+    info.name = path.filename();
+    info.create_timestamp = convertUnixtimeToWinFiletime(st.st_ctime);
+    info.access_timestamp = convertUnixtimeToWinFiletime(st.st_atime);
+    info.write_timestamp = convertUnixtimeToWinFiletime(st.st_mtime);
+    return std::move(info);
   }
-  return false;
+  return {};
 }
 
 std::vector<FileInfo> ListFiles(const std::filesystem::path& path) {
@@ -240,7 +247,7 @@ std::vector<FileInfo> ListFiles(const std::filesystem::path& path) {
     result.push_back(info);
   }
   closedir(dir);
-  return result;
+  return std::move(result);
 }
 
 bool SetAttributes(const std::filesystem::path& path, uint64_t attributes) {
diff --git a/src/xenia/base/main_init_posix.cc b/src/xenia/base/main_init_posix.cc
new file mode 100644
index 000000000..1d125cc8e
--- /dev/null
+++ b/src/xenia/base/main_init_posix.cc
@@ -0,0 +1,46 @@
+/**
+******************************************************************************
+* Xenia : Xbox 360 Emulator Research Project                                 *
+******************************************************************************
+* Copyright 2023 Ben Vanik. All rights reserved.                             *
+* Released under the BSD license - see LICENSE in the root for more details. *
+******************************************************************************
+*/
+#include <gtk/gtk.h>
+#include <gdk/gdk.h>
+#include <xbyak/xbyak/xbyak_util.h>
+
+#include "xenia/ui/window_gtk.h"
+
+class StartupCpuFeatureCheck {
+ public:
+  StartupCpuFeatureCheck() {
+    Xbyak::util::Cpu cpu;
+    const char* error_message = nullptr;
+    if (!cpu.has(Xbyak::util::Cpu::tAVX)) {
+      error_message =
+          "Your CPU does not support AVX, which is required by Xenia. See "
+          "the "
+          "FAQ for system requirements at https://xenia.jp";
+    }
+    if (error_message == nullptr) {
+      return;
+    } else {
+      GtkDialogFlags flags = GTK_DIALOG_DESTROY_WITH_PARENT;
+      auto dialog =
+          gtk_message_dialog_new(nullptr, flags, GTK_MESSAGE_ERROR,
+                                 GTK_BUTTONS_CLOSE,error_message);
+      gtk_dialog_run(GTK_DIALOG(dialog));
+      gtk_widget_destroy(dialog);
+      exit(1);
+    }
+  }
+};
+
+// This is a hack to get an instance of StartupAvxCheck
+// constructed before any initialization code,
+// where the AVX check then happens in the constructor.
+// Ref:
+// https://reviews.llvm.org/D12689#243295
+__attribute__((init_priority(101)))
+static StartupCpuFeatureCheck gStartupAvxCheck;
\ No newline at end of file
diff --git a/src/xenia/base/threading_posix.cc b/src/xenia/base/threading_posix.cc
index 733592800..dcd374f16 100644
--- a/src/xenia/base/threading_posix.cc
+++ b/src/xenia/base/threading_posix.cc
@@ -161,6 +161,10 @@ void Sleep(std::chrono::microseconds duration) {
   } while (ret == -1 && errno == EINTR);
 }
 
+void NanoSleep(int64_t duration) {
+  Sleep(std::chrono::nanoseconds(duration));
+}
+
 // TODO(bwrsandman) Implement by allowing alert interrupts from IO operations
 thread_local bool alertable_state_ = false;
 SleepResult AlertableSleep(std::chrono::microseconds duration) {