Create for loops to construct base level 3 page table

1 files changed, 12 insertions, 3 deletions

diff --git a/arch/x86_64/src/memory/paging/page_table.cpp b/arch/x86_64/src/memory/paging/page_table.cpp
index 059ada2..935dd8c 100644
--- a/arch/x86_64/src/memory/paging/page_table.cpp
+++ b/arch/x86_64/src/memory/paging/page_table.cpp
@@ -70,8 +70,7 @@ namespace teachos::arch::memory::paging
     auto address = next_table_address(table_index);
     if (address)
     {
-      // TODO: Probably erases the data even if the page table already existed previously and had values.
-      return std::construct_at(reinterpret_cast<page_table *>(address.value()));
+      return reinterpret_cast<page_table *>(address.value());
     }
     return std::nullopt;
   }
@@ -109,7 +108,17 @@ namespace teachos::arch::memory::paging
   {
     exception_handling::assert(handle_level == page_table_handle::LEVEL4,
                                "[Page Table] Attempted to initialize a page table of level 3 or lower");
-    auto level3_page_table = std::construct_at(reinterpret_cast<page_table *>(_end_of_image));
+    auto level3_page_table = std::construct_at(reinterpret_cast<page_table *>(&_end_of_image));
+    for (size_t n = 1; n <= PAGE_TABLE_ENTRY_COUNT; ++n)
+    {
+      size_t offset = sizeof(page_table) * n;
+      std::construct_at(reinterpret_cast<page_table *>(&_end_of_image + offset));
+      for (size_t m = 0; m < PAGE_TABLE_ENTRY_COUNT; ++m)
+      {
+        size_t offset = sizeof(page_table) * (n + m);
+        std::construct_at(reinterpret_cast<page_table *>(&_end_of_image + offset));
+      }
+    }
   }
 
   auto page_table_handle::zero_entries() -> void { handle->zero_entries(); }