Add bitset field to cache.h for keeping track of write/validity

1 files changed, 13 insertions, 1 deletions

diff --git a/inc/cache.h b/inc/cache.h
index f1fb942..0c86e97 100644
--- a/inc/cache.h
+++ b/inc/cache.h
@@ -1,6 +1,9 @@
 #ifndef CACHE_H
 #define CACHE_H
-#include <storage.h>
+#include "definitions.h"
+#include "storage.h"
+#include <array>
+#include <bitset>
 
 class Cache : public Storage
 {
@@ -19,6 +22,15 @@ class Cache : public Storage
 
 	Response write(Accessor accessor, signed int data, int address) override;
 	Response read(Accessor accessor, int address) override;
+
+  private:
+	/**
+	 * An array of paired bits.
+	 * If the least significant bit of an element is set, the corresponding
+	 * element in `data` is invalid. If the most significant bit of an element
+	 * is set, the corresponding element in `data` is dirty.
+	 */
+	std::array<std::bitset<2>, L1_CACHE_SIZE> stat;
 };
 
 #endif /* CACHE_H_INCLUDED */