From 796ce76185b00feb86f6b4f738ac6f953c247116 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 16 Mar 2026 22:30:39 +0100
Subject: arch/x86_64: begin new allocator draft

---
 arch/x86_64/CMakeLists.txt                         |  1 +
 .../include/arch/memory/higher_half_mapper.hpp     | 19 ++++++++++++++
 arch/x86_64/src/memory/higher_half_mapper.cpp      | 29 ++++++++++++++++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 arch/x86_64/include/arch/memory/higher_half_mapper.hpp
 create mode 100644 arch/x86_64/src/memory/higher_half_mapper.cpp

diff --git a/arch/x86_64/CMakeLists.txt b/arch/x86_64/CMakeLists.txt
index 7bcf7c2..41932c9 100644
--- a/arch/x86_64/CMakeLists.txt
+++ b/arch/x86_64/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources("x86_64" PRIVATE
 
     # Memory management
     "src/memory/kernel_mapper.cpp"
+    "src/memory/higher_half_mapper.cpp"
     "src/memory/mmu.cpp"
     "src/memory/page_table.cpp"
     "src/memory/region_allocator.cpp"
diff --git a/arch/x86_64/include/arch/memory/higher_half_mapper.hpp b/arch/x86_64/include/arch/memory/higher_half_mapper.hpp
new file mode 100644
index 0000000..66fb58b
--- /dev/null
+++ b/arch/x86_64/include/arch/memory/higher_half_mapper.hpp
@@ -0,0 +1,19 @@
+#ifndef TEACHOS_X86_64_HIGHER_HALF_MAPPER_HPP
+#define TEACHOS_X86_64_HIGHER_HALF_MAPPER_HPP
+
+#include "kapi/memory.hpp"
+namespace arch::memory
+{
+
+  struct higher_half_mapper : kapi::memory::page_mapper
+  {
+    auto map(kapi::memory::page page, kapi::memory::frame frame, flags flags) -> std::byte * override;
+
+    auto unmap(kapi::memory::page page) -> void override;
+
+    auto try_unmap(kapi::memory::page page) noexcept -> bool override;
+  };
+
+}  // namespace arch::memory
+
+#endif
\ No newline at end of file
diff --git a/arch/x86_64/src/memory/higher_half_mapper.cpp b/arch/x86_64/src/memory/higher_half_mapper.cpp
new file mode 100644
index 0000000..9fe3c89
--- /dev/null
+++ b/arch/x86_64/src/memory/higher_half_mapper.cpp
@@ -0,0 +1,29 @@
+#include "arch/memory/higher_half_mapper.hpp"
+
+#include "kapi/memory.hpp"
+
+#include <cstddef>
+
+namespace arch::memory
+{
+
+  auto higher_half_mapper::map(kapi::memory::page page, kapi::memory::frame frame, flags flags) -> std::byte *
+  {
+    static_cast<void>(page);
+    static_cast<void>(frame);
+    static_cast<void>(flags);
+    return nullptr;
+  }
+
+  auto higher_half_mapper::unmap(kapi::memory::page page) -> void
+  {
+    static_cast<void>(page);
+  }
+
+  auto higher_half_mapper::try_unmap(kapi::memory::page page) noexcept -> bool
+  {
+    static_cast<void>(page);
+    return false;
+  }
+
+}  // namespace arch::memory
\ No newline at end of file
-- 
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