From bca36b0c10fcae447c90e211e83987fea28eecdc Mon Sep 17 00:00:00 2001
From: Fabian Imhof <fabian.imhof@ost.ch>
Date: Sat, 26 Oct 2024 08:47:26 +0000
Subject: wip

---
 arch/x86_64/src/memory/paging/page_mapper.cpp | 12 +++++++++++-
 arch/x86_64/src/memory/paging/page_table.cpp  | 15 +++++++++------
 2 files changed, 20 insertions(+), 7 deletions(-)

(limited to 'arch/x86_64/src/memory/paging')

diff --git a/arch/x86_64/src/memory/paging/page_mapper.cpp b/arch/x86_64/src/memory/paging/page_mapper.cpp
index cd77366..dff9ae4 100644
--- a/arch/x86_64/src/memory/paging/page_mapper.cpp
+++ b/arch/x86_64/src/memory/paging/page_mapper.cpp
@@ -4,10 +4,20 @@
 
 namespace teachos::arch::memory::paging
 {
+
   auto create_or_get() -> page_table_handle
   {
+    static auto initialized = false;
     // TODO: As soon as linker error is fixed in toolchain make handle static and return that.
-    return page_table_handle{arch::boot::page_map_level_4, page_table_handle::LEVEL4};
+    page_table_handle active_handle{boot::page_map_level_4, page_table_handle::LEVEL4};
+
+    if (!initialized)
+    {
+      active_handle.initialize_page_tables();
+      initialized = true;
+    }
+
+    return active_handle;
   }
 
   auto translate_page(virtual_page page) -> std::optional<allocator::physical_frame>
diff --git a/arch/x86_64/src/memory/paging/page_table.cpp b/arch/x86_64/src/memory/paging/page_table.cpp
index 2f97a80..b5315a0 100644
--- a/arch/x86_64/src/memory/paging/page_table.cpp
+++ b/arch/x86_64/src/memory/paging/page_table.cpp
@@ -10,11 +10,6 @@ namespace teachos::arch::memory::paging
    */
   struct page_table
   {
-    /**
-     * @brief Defaulted constructor.
-     */
-    page_table() = default;
-
     /**
      * @brief Set every entry of the page to unused.
      */
@@ -105,7 +100,15 @@ namespace teachos::arch::memory::paging
       : handle(handle)
       , handle_level(handle_level)
   {
-    exception_handling::assert(handle, "[Page table] Attempted to pass nullptr as handle to page table handle method");
+    exception_handling::assert(handle, "[Page Table] Attempted to pass nullptr as handle to page table handle method");
+  }
+
+  auto page_table_handle::initialize_page_table() -> void
+  {
+    exception_handling::assert(handle_level == page_table_handle::LEVEL4,
+                               "[Page Table] Attempted to initialize a page table of level 3 or lower");
+
+    auto level_3_page_table = boot::page_map_level_3;
   }
 
   auto page_table_handle::zero_entries() -> void { handle->zero_entries(); }
-- 
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