From de954233b87f5167677f8086686703db1c9f1a7e Mon Sep 17 00:00:00 2001
From: Iru Cai <mytbk920423@gmail.com>
Date: Tue, 25 Feb 2020 16:23:30 +0800
Subject: learning-gem5: timing read

Change-Id: I566aa3e6e14c9d1784eaf93ede88c98a52a1fa71
---
 src/learning_gem5/part2/simple_object.cc | 26 +++++++++++++++++++++++++-
 src/learning_gem5/part2/simple_object.hh |  7 +++----
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/learning_gem5/part2/simple_object.cc b/src/learning_gem5/part2/simple_object.cc
index 76dadf9c8..66f1ca206 100644
--- a/src/learning_gem5/part2/simple_object.cc
+++ b/src/learning_gem5/part2/simple_object.cc
@@ -46,9 +46,18 @@ SimpleObject::SimpleObject(SimpleObjectParams *params) :
     std::cout << "Hello World! From a SimObject!" << std::endl;
 }
 
+bool SimpleObject::SimplePort::recvTimingResp(PacketPtr pkt)
+{
+    std::cout << "Receive packet, val = 0x" <<
+        std::hex << pkt->getLE<uint32_t>() <<
+        ". Tick = " << std::dec << curTick() << std::endl;
+    return true;
+}
+
 void SimpleObject::processEvent()
 {
-    readAtomic();
+    // readAtomic();
+    readTiming();
 }
 
 void SimpleObject::readAtomic()
@@ -66,6 +75,21 @@ void SimpleObject::readAtomic()
     std::cout << "read value 0x" << std::hex << val << std::endl;
 }
 
+void SimpleObject::readTiming()
+{
+    RequestPtr req = std::make_shared<Request>(0x200000, 4, 0, masterId);
+    PacketPtr pkt = Packet::createRead(req);
+
+    // we cannot use a local stack variable in timing request
+    pkt->dataDynamic(new uint32_t);
+
+    bool res = memPort.sendTimingReq(pkt);
+    if (res) {
+        std::cout << "Successfully send timing request. Tick = " <<
+            curTick() << std::endl;
+    }
+}
+
 void SimpleObject::writeAtomic()
 {
     RequestPtr req = std::make_shared<Request>(0x200000, 4, 0, masterId);
diff --git a/src/learning_gem5/part2/simple_object.hh b/src/learning_gem5/part2/simple_object.hh
index 53fa1fea1..e45dce4ae 100644
--- a/src/learning_gem5/part2/simple_object.hh
+++ b/src/learning_gem5/part2/simple_object.hh
@@ -41,10 +41,8 @@ class SimpleObject : public SimObject
     {
     public:
         // these virtual functions must be implemented
-        virtual bool recvTimingResp(PacketPtr pkt)
-        {
-            fatal("SimplePort::recvTimingResp not implemented!\n");
-        }
+        virtual bool recvTimingResp(PacketPtr pkt) override;
+
         virtual void recvReqRetry()
         {
             fatal("SimplePort::recvReqRetry not implemented!\n");
@@ -74,6 +72,7 @@ class SimpleObject : public SimObject
     virtual void startup() override;
     void processEvent();
     void readAtomic();
+    void readTiming();
     void writeAtomic();
 };
 
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