1 files changed, 52 insertions, 0 deletions
diff --git a/cpu/beta_cpu/btb.hh b/cpu/beta_cpu/btb.hh
new file mode 100644
index 000000000..81069eabe
--- /dev/null
+++ b/cpu/beta_cpu/btb.hh
@@ -0,0 +1,52 @@
+#ifndef __BTB_HH__
+#define __BTB_HH__
+
+// For Addr type.
+#include "arch/alpha/isa_traits.hh"
+
+class DefaultBTB
+{
+  private:
+    struct BTBEntry
+    {
+        BTBEntry()
+            : tag(0), target(0), valid(false)
+        {
+        }
+
+        Addr tag;
+        Addr target;
+        bool valid;
+    };
+
+  public:
+    DefaultBTB(unsigned numEntries, unsigned tagBits,
+               unsigned instShiftAmt);
+
+    Addr lookup(const Addr &inst_PC);
+
+    bool valid(const Addr &inst_PC);
+
+    void update(const Addr &inst_PC, const Addr &target_PC);
+
+  private:
+    inline unsigned getIndex(const Addr &inst_PC);
+
+    inline Addr getTag(const Addr &inst_PC);
+
+    BTBEntry *btb;
+
+    unsigned numEntries;
+
+    unsigned idxMask;
+
+    unsigned tagBits;
+
+    unsigned tagMask;
+
+    unsigned instShiftAmt;
+
+    unsigned tagShiftAmt;
+};
+
+#endif // __BTB_HH__