setup GDT & fixed a deadlock

Cargo.lock

@@ -38,6 +38,7 @@ dependencies = [
  "lib_framebuffer",
  "lib_serial",
  "limine",
+ "pc-keyboard",
  "pic8259",
  "spin",
  "x86_64",
@@ -105,6 +106,12 @@ dependencies = [
  "scopeguard",
 ]
 
+[[package]]
+name = "pc-keyboard"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0ca629cbb3f0d5b699c338f0129ff78c9bfd7ea8b1258ad529bff490dc8ed5a"
+
 [[package]]
 name = "pic8259"
 version = "0.11.0"