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, 14 insertions, 6 deletions

diff --git a/sim/system.cc b/sim/system.cc
index 0e0b83332..76c895a88 100644
--- a/sim/system.cc
+++ b/sim/system.cc
@@ -56,16 +56,24 @@ System::~System()
 }
 
 
-void
+int
 System::registerExecContext(ExecContext *xc)
 {
-    if (xc->cpu_id >= 12/*MAX_CPUS*/)
-        panic("Too many CPU's\n");
+    int myIndex = execContexts.size();
+    execContexts.push_back(xc);
+    return myIndex;
+}
+
 
-    if (xc->cpu_id >= xcvec.size())
-        xcvec.resize(xc->cpu_id + 1);
+void
+System::replaceExecContext(int xcIndex, ExecContext *xc)
+{
+    if (xcIndex >= execContexts.size()) {
+        panic("replaceExecContext: bad xcIndex, %d >= %d\n",
+              xcIndex, execContexts.size());
+    }
 
-    xcvec[xc->cpu_id] = xc;
+    execContexts[xcIndex] = xc;
 }