arm: Fix stage 2 determination in table walker

We recompute if we are doing a stage 2 walk inside of the table walker
but we have already figured it out in the tlb. Pass the information in
to the walk instead of recomputing it.

Change-Id: I39637ce99309b2ddbc30344d45ac9ebf6a203401

src/arch/arm/table_walker.cc

@@ -181,7 +181,8 @@ Fault
 TableWalker::walk(RequestPtr _req, ThreadContext *_tc, uint16_t _asid,
                   uint8_t _vmid, bool _isHyp, TLB::Mode _mode,
                   TLB::Translation *_trans, bool _timing, bool _functional,
-                  bool secure, TLB::ArmTranslationType tranType)
+                  bool secure, TLB::ArmTranslationType tranType,
+                  bool _stage2Req)
 {
     assert(!(_functional && _timing));
     ++statWalks;
@@ -292,9 +293,9 @@ TableWalker::walk(RequestPtr _req, ThreadContext *_tc, uint16_t _asid,
     // We only do a second stage of translation if we're not secure, or in
     // hyp mode, the second stage MMU is enabled, and this table walker
     // instance is the first stage.
+    // TODO: fix setting of doingStage2 for timing mode
     currState->doingStage2 = false;
-    currState->stage2Req = currState->hcr.vm && !isStage2 &&
-                           !currState->isSecure && !currState->isHyp;
+    currState->stage2Req = _stage2Req && !isStage2;
 
     bool long_desc_format = currState->aarch64 || _isHyp || isStage2 ||
                             longDescFormatInUse(currState->tc);

src/arch/arm/table_walker.hh

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010-2015 ARM Limited
+ * Copyright (c) 2010-2016 ARM Limited
  * All rights reserved
  *
  * The license below extends only to copyright in the software and shall
@@ -902,7 +902,7 @@ class TableWalker : public MemObject
     Fault walk(RequestPtr req, ThreadContext *tc, uint16_t asid, uint8_t _vmid,
                bool _isHyp, TLB::Mode mode, TLB::Translation *_trans,
                bool timing, bool functional, bool secure,
-               TLB::ArmTranslationType tranType);
+               TLB::ArmTranslationType tranType, bool _stage2Req);
 
     void setTlb(TLB *_tlb) { tlb = _tlb; }
     TLB* getTlb() { return tlb; }

src/arch/arm/tlb.cc

@@ -1384,7 +1384,7 @@ TLB::getTE(TlbEntry **te, RequestPtr req, ThreadContext *tc, Mode mode,
         Fault fault;
         fault = tableWalker->walk(req, tc, asid, vmid, isHyp, mode,
                                   translation, timing, functional, is_secure,
-                                  tranType);
+                                  tranType, stage2Req);
         // for timing mode, return and wait for table walk,
         if (timing || fault != NoFault) {
             return fault;