add descriptor_table access_byte

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp b/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp
new file mode 100644
index 0000000..15a0947
--- /dev/null
+++ b/arch/x86_64/src/context_switching/descriptor_table/access_byte.cpp
@@ -0,0 +1,14 @@
+#include "arch/context_switching/descriptor_table/access_byte.hpp"
+
+#include <bitset>
+
+namespace teachos::arch::context_switching::descriptor_table
+{
+  auto access_byte::contains_flags(std::bitset<8U> other) const -> bool { return (flags & other) == other; }
+
+  auto access_byte::get_privilege_level() const -> privilege_level
+  {
+    constexpr uint8_t PRIVILEGE_MASK = 0b0110'0000;
+    return static_cast<privilege_level>(flags.to_ulong() & PRIVILEGE_MASK);
+  }
+}  // namespace teachos::arch::context_switching::descriptor_table