1 files changed, 57 insertions, 0 deletions
diff --git a/arch/x86_64/src/memory/paging/page_mapper.cpp b/arch/x86_64/src/memory/paging/page_mapper.cpp
new file mode 100644
index 0000000..5372561
--- /dev/null
+++ b/arch/x86_64/src/memory/paging/page_mapper.cpp
@@ -0,0 +1,57 @@
+#include "arch/exception_handling/assert.hpp"
+#include "arch/memory/allocator/area_frame_allocator.hpp"
+#include "arch/memory/paging/virtual_page.hpp"
+
+namespace teachos::arch::memory::paging
+{
+  auto translate_page(virtual_page page) -> std::optional<allocator::physical_frame>
+  {
+    page_table page_table{};
+    bool is_valid = false;
+    auto huge_page = []() -> std::optional<allocator::physical_frame> { return std::nullopt; };
+
+    for (auto level = page_table::LEVEL4; level != page_table::LEVEL1; level--)
+    {
+      is_valid = page_table.next_table(page.get_level_index(level));
+      if (!is_valid)
+      {
+        break;
+      }
+    }
+
+    if (is_valid)
+    {
+      auto level1_index = page.get_level_index(page_table::LEVEL1);
+      auto frame = page_table[level1_index].calculate_pointed_to_frame();
+      return frame;
+    }
+
+    return huge_page();
+  }
+
+  auto translate_address(std::size_t virtual_address) -> std::optional<std::size_t>
+  {
+    std::size_t offset = virtual_address % allocator::PAGE_FRAME_SIZE;
+    virtual_page page = virtual_page::containing_address(virtual_address);
+    std::optional<allocator::physical_frame> frame = translate_page(page);
+
+    if (frame.has_value())
+    {
+      return frame.value().frame_number * allocator::PAGE_FRAME_SIZE + offset;
+    }
+
+    return std::nullopt;
+  }
+
+  auto map_page_to_frame(memory::allocator::area_frame_allocator & allocator, const virtual_page & page,
+                         const memory::allocator::physical_frame & frame, entry::bitset flags) -> void
+  {
+    auto p4 = reinterpret_cast<P4 *>(P4);  // Assuming P4 is defined somewhere
+    auto p3 = p4->next_table_create(page.p4_index(), allocator);
+    auto p2 = p3->next_table_create(page.p3_index(), allocator);
+    auto p1 = p2->next_table_create(page.p2_index(), allocator);
+
+    assert(p1[page.p1_index()].is_unused());
+    p1[page.p1_index()].set(frame, flags | PRESENT);
+  }
+}  // namespace teachos::arch::memory::paging
+\ No newline at end of file