Allow CPUs to specify their own CPU ids.

Make the AlphaConsole calculate the number of CPUs instead
of passing that in as a parameter.

cpu/base.cc:
    pass the desired cpu_id into registerExecContext, offsetting it
    by the thread number.  a cpu_id of -1 means that it should be
    generated for you.
cpu/base.hh:
    Take the cpu_id as a parameter
cpu/o3/alpha_cpu_builder.cc:
cpu/simple/cpu.cc:
    Accept the cpu_id as a parameter
    while we're here, let's remove the multiplier since it is
    not used.
dev/alpha_console.cc:
    don't take the number of CPUs as a parameter.  Calculate it from
    the system based on the number of CPUs that have been registered.
    move init() code to startup() to ensure that all CPUs are registerd.
dev/alpha_console.hh:
python/m5/objects/AlphaConsole.py:
    don't take the number of CPUs as a parameter.
    move init() code to startup() to ensure that all CPUs are registerd.
python/m5/objects/BaseCPU.py:
    take the cpu_id as a parameter.  Default it to -1 which means
    that it will be generated.
sim/system.cc:
    allow the registerExecContext functioin to take a desired
    cpu_id as a parameter.  Check to ensure that the id isn't
    already used.  Accept -1 as a request to have an id assigned.
sim/system.hh:
    keep track of the number of registered exec contexts.
    provide a function for accessing the number of exec contexts
    that checks to ensure that they are all registered correctly.

--HG--
extra : convert_revision : 8e12f96ff8a49fa16cdbbdb4c05c651376c35788

2 files changed, 38 insertions, 16 deletions

diff --git a/sim/system.cc b/sim/system.cc
index 8397b8e01..6f7d53f6b 100644
--- a/sim/system.cc
+++ b/sim/system.cc
@@ -46,7 +46,7 @@ int System::numSystemsRunning = 0;
 
 System::System(Params *p)
     : SimObject(p->name), memctrl(p->memctrl), physmem(p->physmem),
-      init_param(p->init_param), params(p)
+      init_param(p->init_param), numcpus(0), params(p)
 {
     // add self to global system list
     systemList.push_back(this);
@@ -204,13 +204,26 @@ System::breakpoint()
 }
 
 int
-System::registerExecContext(ExecContext *xc)
+System::registerExecContext(ExecContext *xc, int id)
 {
-    int xcIndex = execContexts.size();
-    execContexts.push_back(xc);
+    if (id == -1) {
+        for (id = 0; id < execContexts.size(); id++) {
+            if (!execContexts[id])
+                break;
+        }
+    }
+
+    if (execContexts.size() <= id)
+        execContexts.resize(id + 1);
+
+    if (execContexts[id])
+        panic("Cannot have two CPUs with the same id (%d)\n", id);
+
+    execContexts[id] = xc;
+    numcpus++;
 
     RemoteGDB *rgdb = new RemoteGDB(this, xc);
-    GDBListener *gdbl = new GDBListener(rgdb, 7000 + xcIndex);
+    GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
     gdbl->listen();
     /**
      * Uncommenting this line waits for a remote debugger to connect
@@ -218,13 +231,13 @@ System::registerExecContext(ExecContext *xc)
      */
     //gdbl->accept();
 
-    if (remoteGDB.size() <= xcIndex) {
-        remoteGDB.resize(xcIndex+1);
+    if (remoteGDB.size() <= id) {
+        remoteGDB.resize(id + 1);
     }
 
-    remoteGDB[xcIndex] = rgdb;
+    remoteGDB[id] = rgdb;
 
-    return xcIndex;
+    return id;
 }
 
 void
@@ -238,15 +251,15 @@ System::startup()
 }
 
 void
-System::replaceExecContext(ExecContext *xc, int xcIndex)
+System::replaceExecContext(ExecContext *xc, int id)
 {
-    if (xcIndex >= execContexts.size()) {
-        panic("replaceExecContext: bad xcIndex, %d >= %d\n",
-              xcIndex, execContexts.size());
+    if (id >= execContexts.size()) {
+        panic("replaceExecContext: bad id, %d >= %d\n",
+              id, execContexts.size());
     }
 
-    execContexts[xcIndex] = xc;
-    remoteGDB[xcIndex]->replaceExecContext(xc);
+    execContexts[id] = xc;
+    remoteGDB[id]->replaceExecContext(xc);
 }
 
 void
diff --git a/sim/system.hh b/sim/system.hh
index ab6d264ea..870805e4c 100644
--- a/sim/system.hh
+++ b/sim/system.hh
@@ -58,6 +58,15 @@ class System : public SimObject
     uint64_t init_param;
 
     std::vector<ExecContext *> execContexts;
+    int numcpus;
+
+    int getNumCPUs()
+    {
+        if (numcpus != execContexts.size())
+            panic("cpu array not fully populated!");
+
+        return numcpus;
+    }
 
     /** kernel Symbol table */
     SymbolTable *kernelSymtab;
@@ -150,7 +159,7 @@ class System : public SimObject
      */
     Addr getKernelEntry() const { return kernelEntry; }
 
-    int registerExecContext(ExecContext *xc);
+    int registerExecContext(ExecContext *xc, int xcIndex);
     void replaceExecContext(ExecContext *xc, int xcIndex);
 
     void regStats();