alpha: Quick fix for things related to TLB MRU cache.

simple-timing test for ALPHA_FS breaks.

--HG--
extra : convert_revision : 5a1b05cddd480849913da81a3b3931fec16485a8

2 files changed, 14 insertions, 11 deletions

diff --git a/src/arch/alpha/tlb.cc b/src/arch/alpha/tlb.cc
index 16aaca54d..f701c423d 100644
--- a/src/arch/alpha/tlb.cc
+++ b/src/arch/alpha/tlb.cc
@@ -75,7 +75,7 @@ TLB::~TLB()
 
 // look up an entry in the TLB
 PTE *
-TLB::lookup(Addr vpn, uint8_t asn) const
+TLB::lookup(Addr vpn, uint8_t asn)
 {
     // assume not found...
     PTE *retval = NULL;
@@ -94,7 +94,7 @@ TLB::lookup(Addr vpn, uint8_t asn) const
         }
     }
 
-    if (retval == NULL)
+    if (retval == NULL) {
         PageTable::const_iterator i = lookupTable.find(vpn);
         if (i != lookupTable.end()) {
             while (i->first == vpn) {
@@ -102,10 +102,7 @@ TLB::lookup(Addr vpn, uint8_t asn) const
                 PTE *pte = &table[index];
                 assert(pte->valid);
                 if (vpn == pte->tag && (pte->asma || pte->asn == asn)) {
-                    retval = pte;
-                    PTECache[2] = PTECache[1];
-                    PTECache[1] = PTECache[0];
-                    PTECache[0] = pte;
+                    retval = updateCache(pte);
                     break;
                 }
 
@@ -315,7 +312,7 @@ ITB::regStats()
 
 
 Fault
-ITB::translate(RequestPtr &req, ThreadContext *tc) const
+ITB::translate(RequestPtr &req, ThreadContext *tc)
 {
     //If this is a pal pc, then set PHYSICAL
     if(FULL_SYSTEM && PcPAL(req->getPC()))
@@ -477,7 +474,7 @@ DTB::regStats()
 }
 
 Fault
-DTB::translate(RequestPtr &req, ThreadContext *tc, bool write) const
+DTB::translate(RequestPtr &req, ThreadContext *tc, bool write)
 {
     Addr pc = tc->readPC();
 
diff --git a/src/arch/alpha/tlb.hh b/src/arch/alpha/tlb.hh
index 5be7eab59..a4255f3c5 100644
--- a/src/arch/alpha/tlb.hh
+++ b/src/arch/alpha/tlb.hh
@@ -61,7 +61,7 @@ namespace AlphaISA
         int nlu;			// not last used entry (for replacement)
 
         void nextnlu() { if (++nlu >= size) nlu = 0; }
-        PTE *lookup(Addr vpn, uint8_t asn) const;
+        PTE *lookup(Addr vpn, uint8_t asn);
 
       public:
         TLB(const std::string &name, int size);
@@ -92,6 +92,12 @@ namespace AlphaISA
         // Most recently used page table entries
         PTE *PTECache[3];
         inline void flushCache() { memset(PTECache, 0, 3 * sizeof(PTE*)); }
+        inline PTE* updateCache(PTE *pte) {
+            PTECache[2] = PTECache[1];
+            PTECache[1] = PTECache[0];
+            PTECache[0] = pte;
+            return pte;
+        }
     };
 
     class ITB : public TLB
@@ -106,7 +112,7 @@ namespace AlphaISA
         ITB(const std::string &name, int size);
         virtual void regStats();
 
-        Fault translate(RequestPtr &req, ThreadContext *tc) const;
+        Fault translate(RequestPtr &req, ThreadContext *tc);
     };
 
     class DTB : public TLB
@@ -129,7 +135,7 @@ namespace AlphaISA
         DTB(const std::string &name, int size);
         virtual void regStats();
 
-        Fault translate(RequestPtr &req, ThreadContext *tc, bool write) const;
+        Fault translate(RequestPtr &req, ThreadContext *tc, bool write);
     };
 }