Initial support for CPU switching. New SamplingCPU object encompasses a set

of CPUs that get switched round-robin (though currently we're only shooting for
two CPUs and one switch event, and even that doesn't quite work yet).  Registration
of ExecContexts with System/Process object factored out so we can create two CPUs
but only register one of them at a time.  Also worked at making behavior and naming
in System and Process objects more consistent.

arch/alpha/ev5.cc:
    Rename ipr_init to initIPRs and get rid of unused mem arg.
arch/alpha/fake_syscall.cc:
    Process:numCpus is now a function (not a data member).
base/remote_gdb.hh:
    Support for ExecContext switching.
cpu/base_cpu.cc:
cpu/base_cpu.hh:
cpu/exec_context.cc:
cpu/exec_context.hh:
cpu/simple_cpu/simple_cpu.hh:
    Support for ExecContext switching.
    Renamed contexts array to execContexts to be consistent with Process.
    CPU ID now auto-assigned by system object.
cpu/simple_cpu/simple_cpu.cc:
    Support for ExecContext switching.
    Renamed contexts array to execContexts to be consistent with Process.
    CPU ID now auto-assigned by system object.
    Cleaned up MP full-system initialization a bit.
dev/alpha_console.cc:
    Renamed xcvec array to execContexts to be consistent with Process.
kern/tru64/tru64_system.cc:
kern/tru64/tru64_system.hh:
    Support for ExecContext switching.
    CPU ID now auto-assigned by system object.
sim/prog.cc:
sim/prog.hh:
    Support for ExecContext switching.
    Process:numCpus is now a function (not a data member).
sim/system.cc:
sim/system.hh:
    Support for ExecContext switching.
    Renamed xcvec array to execContexts to be consistent with Process.

--HG--
extra : convert_revision : 79649cffad5bf3e83de8df44236941907926d791

1 files changed, 11 insertions, 7 deletions

diff --git a/sim/prog.hh b/sim/prog.hh
index ee4bc59fe..e93dd684c 100644
--- a/sim/prog.hh
+++ b/sim/prog.hh
@@ -36,7 +36,7 @@
 //
 #ifndef FULL_SYSTEM
 
-#include <list>
+#include <vector>
 
 #include "targetarch/isa_traits.hh"
 #include "sim/sim_object.hh"
@@ -55,10 +55,10 @@ class Process : public SimObject
     bool initialContextLoaded;
 
     // execution contexts associated with this process
-    std::list<ExecContext *> execContexts;
-    // number of CPUs assigned to this process: should match number of
-    // contexts in execContexts list
-    unsigned numCpus;
+    std::vector<ExecContext *> execContexts;
+
+    // number of CPUs (esxec contexts, really) assigned to this process.
+    unsigned int numCpus() { return execContexts.size(); }
 
     // record of blocked context
     struct WaitRec
@@ -123,8 +123,12 @@ class Process : public SimObject
     // override of virtual SimObject method: register statistics
     virtual void regStats();
 
-    // register an execution context for this process
-    void registerExecContext(ExecContext *);
+    // register an execution context for this process.
+    // returns xc's cpu number (index into execContexts[])
+    int registerExecContext(ExecContext *xc);
+
+
+    void replaceExecContext(int xcIndex, ExecContext *xc);
 
     // map simulator fd sim_fd to target fd tgt_fd
     void dup_fd(int sim_fd, int tgt_fd);