change table level 4 address

1 files changed, 4 insertions, 11 deletions

diff --git a/arch/x86_64/src/memory/paging/page_mapper.cpp b/arch/x86_64/src/memory/paging/page_mapper.cpp
index 75b17ff..1371868 100644
--- a/arch/x86_64/src/memory/paging/page_mapper.cpp
+++ b/arch/x86_64/src/memory/paging/page_mapper.cpp
@@ -4,8 +4,9 @@ namespace teachos::arch::memory::paging
 {
   namespace
   {
-    constexpr size_t PAGE_TABLE_LEVEL_4_ADDRESS = 0xfffffffffffff000;
-  }
+    // TODO: Set the address to a sensible location, this is merely a placeholder
+    constexpr size_t PAGE_TABLE_LEVEL_4_ADDRESS = 0x27AC40;
+  }  // namespace
 
   auto create_or_get() -> page_table_handle
   {
@@ -14,19 +15,11 @@ namespace teachos::arch::memory::paging
     return page_table_handle{active_page, page_table_handle::LEVEL4};
   }
 
-  auto subtract_level(page_table_handle::level level) -> page_table_handle::level
-  {
-    exception_handling::assert(level != page_table_handle::LEVEL1,
-                               "[Page table] Attemptd to decrement enum to value outside of range");
-    auto value = static_cast<std::underlying_type<page_table_handle::level>::type>(level);
-    return static_cast<page_table_handle::level>(--value);
-  }
-
   auto translate_page(virtual_page page) -> std::optional<allocator::physical_frame>
   {
     auto current_handle = create_or_get();
 
-    for (auto level = page_table_handle::LEVEL4; level != page_table_handle::LEVEL1; level = subtract_level(level))
+    for (auto level = page_table_handle::LEVEL4; level != page_table_handle::LEVEL1; level--)
     {
       auto next_handle = current_handle.next_table(page.get_level_index(level));
       // If the next table method failed then it is highly likely that it was a huge page and we therefore have to