moving stuff and cleaning up

kernel/src/util/lazy.rs

@@ -0,0 +1,45 @@
+use core::{mem::zeroed, ops::Deref};
+
+pub struct LazyConst<T> {
+    #[cfg(not(debug_assertions))]
+    value: T,
+    #[cfg(debug_assertions)]
+    value: Option<T>,
+}
+
+impl<T> Deref for LazyConst<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        #[cfg(not(debug_assertions))]
+        {
+            &self.value
+        }
+        #[cfg(debug_assertions)]
+        {
+            self.value.as_ref().expect("Value was not assigned")
+        }
+    }
+}
+
+impl<T> LazyConst<T> {
+    pub const fn new() -> Self {
+        unsafe { Self { value: zeroed() } }
+    }
+
+    pub fn init(&self, value: T) {
+        #[cfg(not(debug_assertions))]
+        unsafe {
+            as_mut(self).value = value
+        }
+        #[cfg(debug_assertions)]
+        unsafe {
+            as_mut(self).value = Some(value)
+        }
+    }
+}
+
+pub unsafe fn as_mut<T>(x: &T) -> &mut T {
+    #[allow(invalid_reference_casting)]
+    &mut *((x as *const T) as *mut T)
+}