os: rework kernel architecture

Rework the code structure and architecture of the kernel by separating
platform-dependent and platform-independent code more cleanly. As of
this patchset, full feature parity has not been achieved. Nonetheless, a
sufficient subset of functionality has been ported to the new
architecture to demonstrate the feasibility of the new structure.

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/x86_64/src/memory/paging_root.cpp b/arch/x86_64/src/memory/paging_root.cpp
new file mode 100644
index 0000000..d849a82
--- /dev/null
+++ b/arch/x86_64/src/memory/paging_root.cpp
@@ -0,0 +1,19 @@
+#include "x86_64/memory/paging_root.hpp"
+
+#include <bit>
+#include <cstdint>
+
+namespace teachos::memory::x86_64
+{
+
+  namespace
+  {
+    constexpr auto recursive_base = std::uintptr_t{0177777'776'776'776'776'0000uz};
+  }  // namespace
+
+  auto paging_root::get() -> paging_root *
+  {
+    return std::bit_cast<paging_root *>(recursive_base);
+  }
+
+}  // namespace teachos::memory::x86_64
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