1 files changed, 40 insertions, 0 deletions
diff --git a/cpu/beta_cpu/ras.hh b/cpu/beta_cpu/ras.hh
new file mode 100644
index 000000000..7666f825f
--- /dev/null
+++ b/cpu/beta_cpu/ras.hh
@@ -0,0 +1,40 @@
+#ifndef __RAS_HH__
+#define __RAS_HH__
+
+// For Addr type.
+#include "arch/alpha/isa_traits.hh"
+
+class ReturnAddrStack
+{
+  public:
+    ReturnAddrStack(unsigned numEntries);
+
+    Addr top()
+    { return addrStack[tos]; }
+
+    unsigned topIdx()
+    { return tos; }
+
+    void push(const Addr &return_addr);
+
+    void pop();
+
+    void restore(unsigned top_entry_idx, const Addr &restored_target);
+
+  private:
+    inline void incrTos()
+    { tos = (tos + 1) % numEntries; }
+
+    inline void decrTos()
+    { tos = (tos == 0 ? numEntries - 1 : tos - 1); }
+
+    Addr *addrStack;
+
+    unsigned numEntries;
+
+    unsigned usedEntries;
+
+    unsigned tos;
+};
+
+#endif // __RAS_HH__