1 files changed, 26 insertions, 0 deletions
diff --git a/Kernel/VM/PageDirectory.h b/Kernel/VM/PageDirectory.h
new file mode 100644
index 0000000000..ba655178b2
--- /dev/null
+++ b/Kernel/VM/PageDirectory.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <Kernel/VM/PhysicalPage.h>
+#include <AK/HashMap.h>
+#include <AK/Retainable.h>
+#include <AK/RetainPtr.h>
+
+class PageDirectory : public Retainable<PageDirectory> {
+    friend class MemoryManager;
+public:
+    static Retained<PageDirectory> create() { return adopt(*new PageDirectory); }
+    static Retained<PageDirectory> create_at_fixed_address(PhysicalAddress paddr) { return adopt(*new PageDirectory(paddr)); }
+    ~PageDirectory();
+
+    dword cr3() const { return m_directory_page->paddr().get(); }
+    dword* entries() { return reinterpret_cast<dword*>(cr3()); }
+
+    void flush(LinearAddress);
+
+private:
+    PageDirectory();
+    explicit PageDirectory(PhysicalAddress);
+
+    RetainPtr<PhysicalPage> m_directory_page;
+    HashMap<unsigned, RetainPtr<PhysicalPage>> m_physical_pages;
+};