arch: Make the ISA class inherit from SimObject

The ISA class on stores the contents of ID registers on many
architectures. In order to make reset values of such registers
configurable, we make the class inherit from SimObject, which allows
us to use the normal generated parameter headers.

This patch introduces a Python helper method, BaseCPU.createThreads(),
which creates a set of ISAs for each of the threads in an SMT
system. Although it is currently only needed when creating
multi-threaded CPUs, it should always be called before instantiating
the system as this is an obvious place to configure ID registers
identifying a thread/CPU.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/arch/x86/isa.cc b/src/arch/x86/isa.cc
index 1a9b39840..9dbab8c7e 100644
--- a/src/arch/x86/isa.cc
+++ b/src/arch/x86/isa.cc
@@ -33,6 +33,7 @@
 #include "arch/x86/tlb.hh"
 #include "cpu/base.hh"
 #include "cpu/thread_context.hh"
+#include "params/X86ISA.hh"
 #include "sim/serialize.hh"
 
 namespace X86ISA
@@ -110,6 +111,18 @@ ISA::clear()
     regVal[MISCREG_DR7] = 1 << 10;
 }
 
+ISA::ISA(Params *p)
+    : SimObject(p)
+{
+    clear();
+}
+
+const X86ISAParams *
+ISA::params() const
+{
+    return dynamic_cast<const Params *>(_params);
+}
+
 MiscReg
 ISA::readMiscRegNoEffect(int miscReg)
 {
@@ -376,3 +389,9 @@ ISA::unserialize(EventManager *em, Checkpoint * cp,
 }
 
 }
+
+X86ISA::ISA *
+X86ISAParams::create()
+{
+    return new X86ISA::ISA(this);
+}