Finish implementing 8-byte GDT entries and syscall arg loads.

2 files changed, 3 insertions, 9 deletions

diff --git a/arch/x86_64/src/kernel/cpu/call.cpp b/arch/x86_64/src/kernel/cpu/call.cpp
index 932d248..6564b76 100644
--- a/arch/x86_64/src/kernel/cpu/call.cpp
+++ b/arch/x86_64/src/kernel/cpu/call.cpp
@@ -4,7 +4,7 @@ namespace teachos::arch::kernel::cpu
 {
   auto call(far_pointer pointer) -> void
   {
-    // asm volatile("rex64 lcall *%[input]" : /* no output from call */ : [input] "m"(pointer));
-    asm volatile("ljmp *%0" : : "m"(pointer));
+    asm volatile("rex64 lcall *%[input]" : /* no output from call */ : [input] "m"(pointer));
+    // asm volatile("ljmp *%0" : : "m"(pointer));
   }
 }  // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/src/kernel/cpu/tr.cpp b/arch/x86_64/src/kernel/cpu/tr.cpp
index e281189..a435540 100644
--- a/arch/x86_64/src/kernel/cpu/tr.cpp
+++ b/arch/x86_64/src/kernel/cpu/tr.cpp
@@ -11,12 +11,6 @@ namespace teachos::arch::kernel::cpu
 
   auto load_task_register(uint16_t gdt_offset) -> void
   {
-    // asm volatile("ltr %[input]" : /* no output from call */ : [input] "R"(gdt_offset));
-    //  https://www.scs.stanford.edu/05au-cs240c/lab/i386/s07_03.htm
-    asm volatile("mov %[input], %%ax\n"
-                 "ltr %%ax\n"
-                 : /* no output from call */
-                 : [input] "r"(gdt_offset)
-                 : "ax");
+    asm volatile("ltr %[input]" : /* no output from call */ : [input] "m"(gdt_offset));
   }
 }  // namespace teachos::arch::kernel::cpu