MEM: Move port creation to the memory object(s) construction

This patch moves all port creation from the getPort method to be
consistently done in the MemObject's constructor. This is possible
thanks to the Swig interface passing the length of the vector ports.
Previously there was a mix of: 1) creating the ports as members (at
object construction time) and using getPort for the name resolution,
or 2) dynamically creating the ports in the getPort call. This is now
uniform. Furthermore, objects that would not be complete without a
port have these ports as members rather than having pointers to
dynamically allocated ports.

This patch also enables an elaboration-time enumeration of all the
ports in the system which can be used to determine the masterId.

2 files changed, 16 insertions, 20 deletions

diff --git a/src/arch/arm/table_walker.cc b/src/arch/arm/table_walker.cc
index de3c38e78..8bffe68f8 100644
--- a/src/arch/arm/table_walker.cc
+++ b/src/arch/arm/table_walker.cc
@@ -45,13 +45,14 @@
 #include "debug/Checkpoint.hh"
 #include "debug/TLB.hh"
 #include "debug/TLBVerbose.hh"
-#include "dev/io_device.hh"
 #include "sim/system.hh"
 
 using namespace ArmISA;
 
 TableWalker::TableWalker(const Params *p)
-    : MemObject(p), port(NULL), tlb(NULL), currState(NULL), pending(false),
+    : MemObject(p), port(this, params()->sys, params()->min_backoff,
+                         params()->max_backoff, true),
+      tlb(NULL), currState(NULL), pending(false),
       masterId(p->sys->getMasterId(name())),
       doL1DescEvent(this), doL2DescEvent(this), doProcessEvent(this)
 {
@@ -94,13 +95,7 @@ Port*
 TableWalker::getPort(const std::string &if_name, int idx)
 {
     if (if_name == "port") {
-        if (port != NULL)
-            return port;
-        System *sys = params()->sys;
-        Tick minb = params()->min_backoff;
-        Tick maxb = params()->max_backoff;
-        port = new DmaPort(this, sys, minb, maxb, true);
-        return port;
+        return &port;
     }
     return NULL;
 }
@@ -225,24 +220,24 @@ TableWalker::processWalk()
     }
 
     if (currState->timing) {
-        port->dmaAction(MemCmd::ReadReq, l1desc_addr, sizeof(uint32_t),
-                &doL1DescEvent, (uint8_t*)&currState->l1Desc.data,
-                currState->tc->getCpuPtr()->ticks(1), flag);
+        port.dmaAction(MemCmd::ReadReq, l1desc_addr, sizeof(uint32_t),
+                       &doL1DescEvent, (uint8_t*)&currState->l1Desc.data,
+                       currState->tc->getCpuPtr()->ticks(1), flag);
         DPRINTF(TLBVerbose, "Adding to walker fifo: queue size before adding: %d\n",
                 stateQueueL1.size());
         stateQueueL1.push_back(currState);
         currState = NULL;
     } else if (!currState->functional) {
-        port->dmaAction(MemCmd::ReadReq, l1desc_addr, sizeof(uint32_t),
-                NULL, (uint8_t*)&currState->l1Desc.data,
-                currState->tc->getCpuPtr()->ticks(1), flag);
+        port.dmaAction(MemCmd::ReadReq, l1desc_addr, sizeof(uint32_t),
+                       NULL, (uint8_t*)&currState->l1Desc.data,
+                       currState->tc->getCpuPtr()->ticks(1), flag);
         doL1Descriptor();
         f = currState->fault;
     } else {
         RequestPtr req = new Request(l1desc_addr, sizeof(uint32_t), flag, masterId);
         PacketPtr pkt = new Packet(req, MemCmd::ReadReq, Packet::Broadcast);
         pkt->dataStatic((uint8_t*)&currState->l1Desc.data);
-        port->sendFunctional(pkt);
+        port.sendFunctional(pkt);
         doL1Descriptor();
         delete req;
         delete pkt;
@@ -574,11 +569,11 @@ TableWalker::doL1Descriptor()
 
         if (currState->timing) {
             currState->delayed = true;
-            port->dmaAction(MemCmd::ReadReq, l2desc_addr, sizeof(uint32_t),
+            port.dmaAction(MemCmd::ReadReq, l2desc_addr, sizeof(uint32_t),
                     &doL2DescEvent, (uint8_t*)&currState->l2Desc.data,
                     currState->tc->getCpuPtr()->ticks(1));
         } else if (!currState->functional) {
-            port->dmaAction(MemCmd::ReadReq, l2desc_addr, sizeof(uint32_t),
+            port.dmaAction(MemCmd::ReadReq, l2desc_addr, sizeof(uint32_t),
                     NULL, (uint8_t*)&currState->l2Desc.data,
                     currState->tc->getCpuPtr()->ticks(1));
             doL2Descriptor();
@@ -586,7 +581,7 @@ TableWalker::doL1Descriptor()
             RequestPtr req = new Request(l2desc_addr, sizeof(uint32_t), 0, masterId);
             PacketPtr pkt = new Packet(req, MemCmd::ReadReq, Packet::Broadcast);
             pkt->dataStatic((uint8_t*)&currState->l2Desc.data);
-            port->sendFunctional(pkt);
+            port.sendFunctional(pkt);
             doL2Descriptor();
             delete req;
             delete pkt;
diff --git a/src/arch/arm/table_walker.hh b/src/arch/arm/table_walker.hh
index 520bfd9ac..22d2da5b3 100644
--- a/src/arch/arm/table_walker.hh
+++ b/src/arch/arm/table_walker.hh
@@ -44,6 +44,7 @@
 
 #include "arch/arm/miscregs.hh"
 #include "arch/arm/tlb.hh"
+#include "dev/io_device.hh"
 #include "mem/mem_object.hh"
 #include "mem/request.hh"
 #include "params/ArmTableWalker.hh"
@@ -328,7 +329,7 @@ class TableWalker : public MemObject
 
 
     /** Port to issue translation requests from */
-    DmaPort *port;
+    DmaPort port;
 
     /** TLB that is initiating these table walks */
     TLB *tlb;