feat: Implement fmt::Pointer, Address::as_ptr and Address::as_mut_ptr

Author: haraldh

src/address.rs

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use super::*;
+use core::fmt::{self, Formatter};
 use core::marker::PhantomData;
 use core::mem::align_of;
 use core::ops::*;
@@ -48,6 +49,40 @@ impl<T, U> Address<T, U> {
     }
 }
 
+impl<T, U> Address<T, U>
+where
+    Address<usize, U>: From<Address<T, U>>,
+    Address<T, U>: Copy,
+{
+    /// Returns a raw pointer to its inner type
+    ///
+    /// # Safety
+    /// Behavior is undefined, if the pointer is used and
+    /// is not aligned or points to uninitialized memory.
+    pub fn as_ptr(&self) -> *const U {
+        Address::<usize, U>::from(*self).0 as *const U
+    }
+
+    /// Returns a raw pointer to its inner type
+    ///
+    /// # Safety
+    /// Behavior is undefined, if the pointer is used and
+    /// is not aligned or points to uninitialized memory.
+    pub fn as_mut_ptr(&self) -> *mut U {
+        Address::<usize, U>::from(*self).0 as *mut U
+    }
+}
+
+impl<T: Copy, U> fmt::Pointer for Address<T, U>
+where
+    Address<usize, U>: From<Address<T, U>>,
+    Address<T, U>: Copy,
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "{:p}", self.as_ptr())
+    }
+}
+
 pub struct AlignmentError;
 
 impl<T, U> Address<T, U>
@@ -266,4 +301,10 @@ mod test {
         assert_eq!(Address::from(7usize).raise::<u32>().raw(), 8);
         assert_eq!(Address::from(7usize).lower::<u32>().raw(), 4);
     }
+
+    #[test]
+    fn print_pointer() {
+        println!("{:p}", Address::from(4usize).raise::<Page>());
+        println!("{:p}", Address::from(7u64).lower::<u32>());
+    }
 }

src/lib.rs

@@ -6,7 +6,7 @@
 //!   * Offsets
 //!   * Pages
 
-#![no_std]
+#![cfg_attr(not(test), no_std)]
 #![deny(clippy::all)]
 #![deny(missing_docs)]