From e66ce512d277eb647a81b785eb7401a51a18b867 Mon Sep 17 00:00:00 2001
From: DH <dh.rpcs3@gmail.com>
Date: Mon, 6 Oct 2025 01:57:23 +0300
Subject: [PATCH] kernel: Add GlobalKernelObject utility

---
 CMakeLists.txt                                |   3 +-
 kernel/CMakeLists.txt                         |  10 ++
 kernel/include/kernel/GlobalKernelObject.hpp  | 139 ++++++++++++++++++
 kernel/orbis/CMakeLists.txt                   |   2 +-
 .../include/orbis/GlobalKernelObject.hpp      |  26 ++++
 rpcsx/main.cpp                                |   3 +
 6 files changed, 180 insertions(+), 3 deletions(-)
 create mode 100644 kernel/CMakeLists.txt
 create mode 100644 kernel/include/kernel/GlobalKernelObject.hpp
 create mode 100644 kernel/orbis/include/orbis/GlobalKernelObject.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dff353bec..f446a2cf9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -272,14 +272,13 @@ target_compile_definitions(rx PRIVATE
 if (WITH_PS4)
     find_package(nlohmann_json CONFIG)
     add_subdirectory(tools)
-    add_subdirectory(kernel/orbis)
 endif()
 
 add_subdirectory(rpcsx)
+add_subdirectory(kernel)
 
 if (WITH_PS3)
     include(ConfigureCompiler)
-    add_subdirectory(kernel/cellos)
     add_subdirectory(rpcs3)
     add_subdirectory(ps3fw)
 endif()
diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
new file mode 100644
index 000000000..d488787fa
--- /dev/null
+++ b/kernel/CMakeLists.txt
@@ -0,0 +1,10 @@
+add_library(kernel INTERFACE)
+target_include_directories(kernel INTERFACE include)
+
+if (WITH_PS3)
+    add_subdirectory(cellos)
+endif()
+
+if (WITH_PS4)
+    add_subdirectory(orbis)
+endif()
diff --git a/kernel/include/kernel/GlobalKernelObject.hpp b/kernel/include/kernel/GlobalKernelObject.hpp
new file mode 100644
index 000000000..506cfbd24
--- /dev/null
+++ b/kernel/include/kernel/GlobalKernelObject.hpp
@@ -0,0 +1,139 @@
+#pragma once
+
+#include "rx/LinkedNode.hpp"
+#include "rx/Serializer.hpp"
+#include <cassert>
+
+namespace kernel {
+
+namespace detail {
+struct GlobalObjectCtl {
+  void (*construct)();
+  void (*destruct)();
+  void (*serialize)(rx::Serializer &);
+  void (*deserialize)(rx::Deserializer &);
+};
+
+template <typename NamespaceT, typename T> struct GlobalKernelObjectInstance {
+  static inline T *instance = nullptr;
+
+  static inline rx::LinkedNode<GlobalObjectCtl> ctl = {
+      .object = {
+          .construct = +[] { instance->construct(); },
+          .destruct = +[] { instance->destruct(); },
+          .serialize = +[](rx::Serializer &s) { instance->serialize(s); },
+          .deserialize = +[](rx::Deserializer &s) { instance->deserialize(s); },
+      },
+  };
+};
+} // namespace detail
+
+template <typename NamespaceT> struct GlobalKernelObjectStorage {
+  template <typename T> static void AddObject() {
+    auto node = &detail::GlobalKernelObjectInstance<NamespaceT, T>::ctl;
+    auto head = GetHead();
+    if (head) {
+      head->prev = node;
+      node->next = head;
+    }
+
+    *GetHeadPtr() = node;
+  }
+
+  static void ConstructAll() {
+    for (auto it = GetHead(); it != nullptr; it = it->next) {
+      it->object.construct();
+    }
+  }
+
+  static void DestructAll() {
+    for (auto it = GetHead(); it != nullptr; it = it->next) {
+      it->object.destruct();
+    }
+  }
+
+  static void SerializeAll(rx::Serializer &s) {
+    for (auto it = GetHead(); it != nullptr; it = it->next) {
+      it->object.serialize(s);
+    }
+  }
+
+  static void DeserializeAll(rx::Deserializer &s) {
+    for (auto it = GetHead(); it != nullptr; it = it->next) {
+      it->object.deserialize(s);
+    }
+  }
+
+private:
+  static rx::LinkedNode<detail::GlobalObjectCtl> *GetHead() {
+    return *GetHeadPtr();
+  }
+
+  static rx::LinkedNode<detail::GlobalObjectCtl> **GetHeadPtr() {
+    static rx::LinkedNode<detail::GlobalObjectCtl> *registry;
+    return &registry;
+  }
+};
+
+template <rx::Serializable T, typename NamespaceT>
+  requires std::is_default_constructible_v<T>
+class GlobalKernelObject {
+  union U {
+    T object;
+
+    U() {}
+    ~U() {}
+  };
+
+  U mHolder;
+
+public:
+  template <typename = void> GlobalKernelObject() {
+    auto &instance =
+        detail::GlobalKernelObjectInstance<NamespaceT,
+                                           GlobalKernelObject>::instance;
+    assert(instance == nullptr);
+    instance = this;
+    GlobalKernelObjectStorage<NamespaceT>::template AddObject<
+        GlobalKernelObject>();
+  }
+
+  T *operator->() { return &mHolder.object; }
+  const T *operator->() const { return &mHolder.object; }
+  T &operator*() { return mHolder.object; }
+  const T &operator*() const { return mHolder.object; }
+  operator T &() { return mHolder.object; }
+  operator const T &() const { return mHolder.object; }
+
+  void serialize(rx::Serializer &s)
+    requires rx::Serializable<T>
+  {
+    s.serialize(mHolder.object);
+  }
+
+  void deserialize(rx::Deserializer &s)
+    requires rx::Serializable<T>
+  {
+    std::construct_at(&mHolder.object);
+    s.deserialize(mHolder.object);
+  }
+
+  T &get() { return mHolder.object; }
+  const T &get() const { return mHolder.object; }
+
+private:
+  template <typename... Args>
+    requires(std::is_constructible_v<T, Args && ...>)
+  void construct(Args &&...args) noexcept(
+      std::is_nothrow_constructible_v<T, Args &&...>) {
+    std::construct_at(&mHolder.object, std::forward<Args>(args)...);
+  }
+
+  template <typename... Args>
+  void destruct() noexcept(std::is_nothrow_destructible_v<T>) {
+    mHolder.object.~T();
+  }
+
+  friend detail::GlobalKernelObjectInstance<NamespaceT, GlobalKernelObject>;
+};
+} // namespace kernel
diff --git a/kernel/orbis/CMakeLists.txt b/kernel/orbis/CMakeLists.txt
index 5b5d4c584..003b91709 100644
--- a/kernel/orbis/CMakeLists.txt
+++ b/kernel/orbis/CMakeLists.txt
@@ -67,7 +67,7 @@ add_library(obj.orbis-kernel OBJECT
   src/utils/Logs.cpp
 )
 
-target_link_libraries(obj.orbis-kernel PUBLIC orbis::kernel::config rx)
+target_link_libraries(obj.orbis-kernel PUBLIC orbis::kernel::config rx kernel)
 
 target_include_directories(obj.orbis-kernel
     PUBLIC
diff --git a/kernel/orbis/include/orbis/GlobalKernelObject.hpp b/kernel/orbis/include/orbis/GlobalKernelObject.hpp
new file mode 100644
index 000000000..755b55d41
--- /dev/null
+++ b/kernel/orbis/include/orbis/GlobalKernelObject.hpp
@@ -0,0 +1,26 @@
+#pragma once
+#include <kernel/GlobalKernelObject.hpp>
+
+namespace orbis {
+struct OrbisNamespace;
+
+template <rx::Serializable T>
+using GlobalKernelObject = kernel::GlobalKernelObject<T, OrbisNamespace>;
+
+template <rx::Serializable T> GlobalKernelObject<T> createGlobalObject() {
+  return {};
+}
+
+inline void constructAllGlobals() {
+  kernel::GlobalKernelObjectStorage<OrbisNamespace>::ConstructAll();
+}
+inline void destructAllGlobals() {
+  kernel::GlobalKernelObjectStorage<OrbisNamespace>::DestructAll();
+}
+
+template <typename T> T &getGlobalObject() {
+  assert(detail::GlobalKernelObjectInstance<GlobalKernelObject<T>>::instance);
+  return kernel::detail::GlobalKernelObjectInstance<
+             OrbisNamespace, GlobalKernelObject<T>>::instance->get();
+}
+} // namespace orbis
diff --git a/rpcsx/main.cpp b/rpcsx/main.cpp
index fec2f65a3..84de7eaed 100644
--- a/rpcsx/main.cpp
+++ b/rpcsx/main.cpp
@@ -26,6 +26,7 @@
 
 #include <elf.h>
 #include <linux/prctl.h>
+#include <orbis/GlobalKernelObject.hpp>
 #include <orbis/KernelContext.hpp>
 #include <orbis/module.hpp>
 #include <orbis/module/Module.hpp>
@@ -1265,6 +1266,8 @@ int main(int argc, const char *argv[]) {
   guestInitDev();
   guestInitFd(mainThread);
 
+  orbis::constructAllGlobals();
+
   // data transfer mode
   // 0 - normal
   // 1 - source