Implement idtr structure and document possible flags.

1 files changed, 6 insertions, 23 deletions

diff --git a/arch/x86_64/src/kernel/cpu/ss.cpp b/arch/x86_64/src/kernel/cpu/ss.cpp
index 1f28e7f..0978eca 100644
--- a/arch/x86_64/src/kernel/cpu/ss.cpp
+++ b/arch/x86_64/src/kernel/cpu/ss.cpp
@@ -2,32 +2,15 @@
 
 namespace teachos::arch::kernel::cpu
 {
-  segment_selector::segment_selector(uint16_t index, std::bitset<1U> table_indicator,
-                                     std::bitset<2U> requested_privilege_level)
-      : index(index)
-      , table_indicator(table_indicator)
-      , requested_privilege_level(requested_privilege_level)
+  auto read_ss() -> context_switching::interrupt_descriptor_table::segment_selector
   {
-    // Nothing to do
-  }
-
-  auto segment_selector::to_uint16() const -> uint16_t
-  {
-    return static_cast<uint16_t>((index << 3) | (table_indicator.to_ulong() << 2) |
-                                 requested_privilege_level.to_ulong());
-  }
-
-  auto read_ss() -> uint16_t
-  {
-    uint16_t segment_selector;
-    asm volatile("mov %%ss, %[output]" : [output] "=r"(segment_selector));
+    context_switching::interrupt_descriptor_table::segment_selector segment_selector{};
+    asm volatile("mov %%ss, %[output]" : [output] "=m"(segment_selector));
     return segment_selector;
   }
 
-  auto write_ss(segment_selector selector) -> void
+  auto write_ss(context_switching::interrupt_descriptor_table::segment_selector selector) -> void
   {
-    uint16_t ss = selector.to_uint16();
-    asm volatile("mov %[input], %%ss" : /* no output from call */ : [input] "r"(ss));
+    asm volatile("mov %[input], %%ss" : /* no output from call */ : [input] "m"(selector));
   }
-
-}  // namespace teachos::arch::kernel::cpu
\ No newline at end of file
+}  // namespace teachos::arch::kernel::cpu