start implementing TSS

2 files changed, 18 insertions, 1 deletions

diff --git a/arch/x86_64/src/kernel/cpu/lgdt.cpp b/arch/x86_64/src/kernel/cpu/gdtr.cpp
index 386914f..2fe3a99 100644
--- a/arch/x86_64/src/kernel/cpu/lgdt.cpp
+++ b/arch/x86_64/src/kernel/cpu/gdtr.cpp
@@ -1,4 +1,4 @@
-#include "arch/kernel/cpu/lgdt.hpp"
+#include "arch/kernel/cpu/gdtr.hpp"
 
 #include "arch/context_switching/descriptor_table/global_descriptor_table_pointer.hpp"
 
diff --git a/arch/x86_64/src/kernel/cpu/tr.cpp b/arch/x86_64/src/kernel/cpu/tr.cpp
new file mode 100644
index 0000000..a28b9fc
--- /dev/null
+++ b/arch/x86_64/src/kernel/cpu/tr.cpp
@@ -0,0 +1,17 @@
+#include "arch/kernel/cpu/tr.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+  auto store_task_register() -> uint16_t
+  {
+    uint16_t current_value{};
+    asm("str %[output]" : [output] "=m"(current_value));
+    return current_value;
+  }
+
+  // TODO: Is this really correct?
+  auto load_task_register(uint16_t gdt_offset) -> void
+  {
+    asm volatile("ltr %[input]" : /* no output from call */ : [input] "m"(gdt_offset));
+  }
+}  // namespace teachos::arch::kernel::cpu