x86_64: implement very simple VGA text output

1 files changed, 43 insertions, 0 deletions

diff --git a/source/boot/include/boot/asm_pointer.hpp b/source/boot/include/boot/asm_pointer.hpp
new file mode 100644
index 0000000..ec7141e
--- /dev/null
+++ b/source/boot/include/boot/asm_pointer.hpp
@@ -0,0 +1,43 @@
+#ifndef TEACHOS_BOOT_ASM_POINTER_HPP
+#define TEACHOS_BOOT_ASM_POINTER_HPP
+
+namespace teachos::boot
+{
+
+  template<typename Type>
+  struct asm_pointer
+  {
+    constexpr asm_pointer(Type & pointer)
+        : m_pointer{&pointer}
+    {
+    }
+
+    auto constexpr operator->() -> Type * { return m_pointer; }
+    auto constexpr operator->() const -> Type const * { return m_pointer; }
+    auto constexpr operator*() -> Type & { return *m_pointer; }
+    auto constexpr operator*() const -> Type const & { return *m_pointer; }
+
+  private:
+    Type * m_pointer;
+  };
+
+  template<typename Type>
+  struct asm_pointer<Type const>
+  {
+    constexpr asm_pointer(Type const & pointer)
+        : m_pointer{&pointer}
+    {
+    }
+
+    auto constexpr operator->() -> Type const * { return m_pointer; }
+    auto constexpr operator->() const -> Type const * { return m_pointer; }
+    auto constexpr operator*() -> Type const & { return *m_pointer; }
+    auto constexpr operator*() const -> Type const & { return *m_pointer; }
+
+  private:
+    Type const * m_pointer;
+  };
+
+}  // namespace teachos::boot
+
+#endif
\ No newline at end of file