Support mapping ranges

Cargo.toml

@@ -39,6 +39,7 @@ nightly = [ "const_fn", "step_trait", "abi_x86_interrupt", "doc_cfg" ]
 abi_x86_interrupt = []
 const_fn = []
 step_trait = []
+experimental = []
 doc_cfg = []
 
 # These features are no longer used and only there for backwards compatibility.

src/structures/paging/frame.rs

@@ -161,6 +161,15 @@ impl<S: PageSize> Iterator for PhysFrameRange<S> {
             None
         }
     }
+
+    #[inline]
+    fn count(self) -> usize {
+        if !self.is_empty() {
+            ((self.end.start_address() - self.start.start_address()) / S::SIZE) as usize
+        } else {
+            0
+        }
+    }
 }
 
 impl<S: PageSize> fmt::Debug for PhysFrameRange<S> {