arch, cpu: Add support for flattening misc register indexes.

With ARMv8 support the same misc register id  results in accessing different
registers depending on the current mode of the processor. This patch adds
the same orthogonality to the misc register file as the others (int, float, cc).
For all the othre ISAs this is currently a null-implementation.

Additionally, a system variable is added to all the ISA objects.

9 files changed, 45 insertions, 4 deletions

diff --git a/src/arch/alpha/AlphaISA.py b/src/arch/alpha/AlphaISA.py
index 64c9e4733..d85354704 100644
--- a/src/arch/alpha/AlphaISA.py
+++ b/src/arch/alpha/AlphaISA.py
@@ -35,9 +35,13 @@
 #
 # Authors: Andreas Sandberg
 
+from m5.params import *
+from m5.proxy import *
 from m5.SimObject import SimObject
 
 class AlphaISA(SimObject):
     type = 'AlphaISA'
     cxx_class = 'AlphaISA::ISA'
     cxx_header = "arch/alpha/isa.hh"
+
+    system = Param.System(Parent.any, "System this ISA object belongs to")
diff --git a/src/arch/alpha/isa.cc b/src/arch/alpha/isa.cc
index 9cfd840d9..95dfdedd6 100644
--- a/src/arch/alpha/isa.cc
+++ b/src/arch/alpha/isa.cc
@@ -40,7 +40,7 @@ namespace AlphaISA
 {
 
 ISA::ISA(Params *p)
-    : SimObject(p)
+    : SimObject(p), system(p->system)
 {
     clear();
     initializeIprTable();
diff --git a/src/arch/alpha/isa.hh b/src/arch/alpha/isa.hh
index d30499066..35a26c108 100644
--- a/src/arch/alpha/isa.hh
+++ b/src/arch/alpha/isa.hh
@@ -39,6 +39,7 @@
 #include "arch/alpha/types.hh"
 #include "base/types.hh"
 #include "sim/sim_object.hh"
+#include "sim/system.hh"
 
 struct AlphaISAParams;
 class BaseCPU;
@@ -55,6 +56,9 @@ namespace AlphaISA
         typedef AlphaISAParams Params;
 
       protected:
+        // Parent system
+        System *system;
+
         uint64_t fpcr;       // floating point condition codes
         uint64_t uniq;       // process-unique register
         bool lock_flag;      // lock flag for LL/SC
@@ -110,6 +114,12 @@ namespace AlphaISA
             return reg;
         }
 
+        int
+        flattenMiscIndex(int reg)
+        {
+            return reg;
+        }
+
         const Params *params() const;
 
         ISA(Params *p);
diff --git a/src/arch/mips/MipsISA.py b/src/arch/mips/MipsISA.py
index bc969a906..22602ff0c 100644
--- a/src/arch/mips/MipsISA.py
+++ b/src/arch/mips/MipsISA.py
@@ -37,11 +37,14 @@
 
 from m5.SimObject import SimObject
 from m5.params import *
+from m5.proxy import *
 
 class MipsISA(SimObject):
     type = 'MipsISA'
     cxx_class = 'MipsISA::ISA'
     cxx_header = "arch/mips/isa.hh"
 
+    system = Param.System(Parent.any, "System this ISA object belongs to")
+
     num_threads = Param.UInt8(1, "Maximum number this ISA can handle")
     num_vpes = Param.UInt8(1, "Maximum number of vpes this ISA can handle")
diff --git a/src/arch/mips/isa.cc b/src/arch/mips/isa.cc
index 891ed5e2f..164f10d5d 100644
--- a/src/arch/mips/isa.cc
+++ b/src/arch/mips/isa.cc
@@ -89,8 +89,7 @@ ISA::miscRegNames[NumMiscRegs] =
 };
 
 ISA::ISA(Params *p)
-    : SimObject(p),
-      numThreads(p->num_threads), numVpes(p->num_vpes)
+    : SimObject(p), numThreads(p->num_threads), numVpes(p->num_vpes)
 {
     miscRegFile.resize(NumMiscRegs);
     bankType.resize(NumMiscRegs);
diff --git a/src/arch/mips/isa.hh b/src/arch/mips/isa.hh
index c601cfc1e..eddf75272 100644
--- a/src/arch/mips/isa.hh
+++ b/src/arch/mips/isa.hh
@@ -184,6 +184,13 @@ namespace MipsISA
         {
             return reg;
         }
+
+        int
+        flattenMiscIndex(int reg)
+        {
+            return reg;
+        }
+
     };
 }
 
diff --git a/src/arch/power/isa.hh b/src/arch/power/isa.hh
index 7b59b2ad1..028142b50 100644
--- a/src/arch/power/isa.hh
+++ b/src/arch/power/isa.hh
@@ -105,6 +105,12 @@ class ISA : public SimObject
         return reg;
     }
 
+    int
+    flattenMiscIndex(int reg)
+    {
+        return reg;
+    }
+
     void startup(ThreadContext *tc) {}
 
     /// Explicitly import the otherwise hidden startup
diff --git a/src/arch/sparc/isa.hh b/src/arch/sparc/isa.hh
index e6f023bc0..31cb09c7e 100644
--- a/src/arch/sparc/isa.hh
+++ b/src/arch/sparc/isa.hh
@@ -177,7 +177,6 @@ class ISA : public SimObject
     using SimObject::startup;
 
   protected:
-
     bool isHyperPriv() { return hpstate.hpriv; }
     bool isPriv() { return hpstate.hpriv || pstate.priv; }
     bool isNonPriv() { return !isPriv(); }
@@ -213,6 +212,13 @@ class ISA : public SimObject
         return reg;
     }
 
+    int
+    flattenMiscIndex(int reg)
+    {
+        return reg;
+    }
+
+
     typedef SparcISAParams Params;
     const Params *params() const;
 
diff --git a/src/arch/x86/isa.hh b/src/arch/x86/isa.hh
index 5f36fd7ad..14c8e98c9 100644
--- a/src/arch/x86/isa.hh
+++ b/src/arch/x86/isa.hh
@@ -91,6 +91,12 @@ namespace X86ISA
             return reg;
         }
 
+        int
+        flattenMiscIndex(int reg)
+        {
+            return reg;
+        }
+
         void serialize(std::ostream &os);
         void unserialize(Checkpoint *cp, const std::string &section);
         void startup(ThreadContext *tc);