Rework x86_64 paging and vmm

kernel/spinlock/spinlock.c

@@ -13,11 +13,12 @@ void spinlock_acquire(SpinLock *sl) {
     unlocked = false;
     SPINLOCK_HINT();
   }
-  hal_intr_disable();
 }
 
 void spinlock_release(SpinLock *sl) {
-  atomic_store(&sl->lock, false);
-  hal_intr_enable();
+  bool locked = true;
+  if (atomic_compare_exchange_strong(&sl->lock, &locked, false)) {
+    atomic_store(&sl->lock, false);
+  }
 }