create active_page_table

1 files changed, 31 insertions, 0 deletions

diff --git a/arch/x86_64/src/memory/paging/active_page_table.cpp b/arch/x86_64/src/memory/paging/active_page_table.cpp
new file mode 100644
index 0000000..eb85c34
--- /dev/null
+++ b/arch/x86_64/src/memory/paging/active_page_table.cpp
@@ -0,0 +1,31 @@
+#include "arch/memory/paging/active_page_table.hpp"
+
+namespace teachos::arch::memory::paging
+{
+  struct active_page_table
+  {
+    auto create(page_table * level4_page_table) -> active_page_table *
+    {
+      if (instantiated)
+      {
+        return this;
+      }
+
+      instantiated = true;
+      return &active_page_table(level4_page_table);
+    }
+
+    active_page_table(const active_page_table &) = delete;
+    active_page_table & operator=(const active_page_table &) = delete;
+
+  private:
+    active_page_table(page_table * level4_page_table)
+        : level4_page_table(level4_page_table)
+    {
+      // Nothing to do
+    }
+
+    bool instantiated = false;
+    page_table * level4_page_table;
+  };
+}  // namespace teachos::arch::memory::paging
\ No newline at end of file