From c4c27c10e68b0de502e123c1139d3cf69bf0777a Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Thu, 13 Apr 2017 18:24:27 +0200
Subject: [PATCH] Create a memory::paging::entry submodule with an Entry struct

---
 src/memory/paging/entry.rs | 13 +++++++++++++
 src/memory/paging/mod.rs   |  2 ++
 2 files changed, 15 insertions(+)
 create mode 100644 src/memory/paging/entry.rs

diff --git a/src/memory/paging/entry.rs b/src/memory/paging/entry.rs
new file mode 100644
index 0000000..6470195
--- /dev/null
+++ b/src/memory/paging/entry.rs
@@ -0,0 +1,13 @@
+use memory::Frame;
+
+pub struct Entry(u64);
+
+impl Entry {
+    pub fn is_unused(&self) -> bool {
+        self.0 == 0
+    }
+
+    pub fn set_unused(&mut self) {
+        self.0 = 0;
+    }
+}
diff --git a/src/memory/paging/mod.rs b/src/memory/paging/mod.rs
index a06c073..9bcddfb 100644
--- a/src/memory/paging/mod.rs
+++ b/src/memory/paging/mod.rs
@@ -1,5 +1,7 @@
 use memory::PAGE_SIZE;
 
+mod entry;
+
 const ENTRY_COUNT: usize = 512;
 
 pub type PhysicalAddress = usize;