mem-cache: Use set and way for ReplaceableEntry

Replaceable entries belong to table-like structures, and therefore
they should be indexable by combining a row and a column. These,
using conventional cache nomenclature translate to sets and ways.

Make these entries aware of their sets and ways. The idea is to
make indexing policies usable by other table-like structures. In
order to do so we move sets and ways to ReplaceableEntry, which
will be the common base among table entries.

Change-Id: If0e3dacf9ea2f523af9cface067469ccecf82648
Reviewed-on: https://gem5-review.googlesource.com/c/12764
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

1 files changed, 40 insertions, 4 deletions

diff --git a/src/mem/cache/replacement_policies/base.hh b/src/mem/cache/replacement_policies/base.hh
index 0ce86d091..6ac7dca85 100644
--- a/src/mem/cache/replacement_policies/base.hh
+++ b/src/mem/cache/replacement_policies/base.hh
@@ -50,12 +50,48 @@ struct ReplacementData {};
  */
 class ReplaceableEntry
 {
-  public:
+  private:
+    /**
+     * Set to which this entry belongs.
+     */
+    uint32_t _set;
+
+    /**
+     * Way (relative position within the set) to which this entry belongs.
+     */
+    uint32_t _way;
+
+   public:
+     /**
+      * Replacement data associated to this entry.
+      * It is instantiated by the replacement policy.
+      */
+     std::shared_ptr<ReplacementData> replacementData;
+
     /**
-     * Replacement data associated to this entry.
-     * It is instantiated by the replacement policy.
+     * Set both the set and way. Should be called only once.
+     *
+     * @param set The set of this entry.
+     * @param way The way of this entry.
+     */
+    void setPosition(const uint32_t set, const uint32_t way) {
+        _set = set;
+        _way = way;
+    }
+
+    /**
+     * Get set number.
+     *
+     * @return The set to which this entry belongs.
+     */
+    uint32_t getSet() const { return _set; }
+
+    /**
+     * Get way number.
+     *
+     * @return The way to which this entry belongs.
      */
-    std::shared_ptr<ReplacementData> replacementData;
+    uint32_t getWay() const { return _way; }
 };
 
 /**