learning-gem5: memory access example for simple object

Change-Id: I63a68239ac73b2bce3dea5692deac29a3467d27b

1 files changed, 52 insertions, 1 deletions

diff --git a/src/learning_gem5/part2/simple_object.cc b/src/learning_gem5/part2/simple_object.cc
index f340f1327..76dadf9c8 100644
--- a/src/learning_gem5/part2/simple_object.cc
+++ b/src/learning_gem5/part2/simple_object.cc
@@ -32,12 +32,63 @@
 
 #include <iostream>
 
+#include "mem/packet.hh"
+#include "mem/request.hh"
+#include "sim/system.hh"
+
 SimpleObject::SimpleObject(SimpleObjectParams *params) :
-    SimObject(params)
+    SimObject(params),
+    masterId(params->system->getMasterId(this)),
+    memPort(params->name + ".mem_side", this),
+    isread(params->isread),
+    event([this] { processEvent(); }, name() + ".event")
 {
     std::cout << "Hello World! From a SimObject!" << std::endl;
 }
 
+void SimpleObject::processEvent()
+{
+    readAtomic();
+}
+
+void SimpleObject::readAtomic()
+{
+    uint32_t val = 0;
+
+    RequestPtr req = std::make_shared<Request>(0x200000, 4, 0, masterId);
+    PacketPtr pkt = Packet::createRead(req);
+
+    pkt->dataStatic(&val);
+    //    pkt->setData((const uint8_t *)&x);
+
+    Tick t = memPort.sendAtomic(pkt);
+    std::cout << "sendAtomic read " << t << " ticks." << std::endl;
+    std::cout << "read value 0x" << std::hex << val << std::endl;
+}
+
+void SimpleObject::writeAtomic()
+{
+    RequestPtr req = std::make_shared<Request>(0x200000, 4, 0, masterId);
+    PacketPtr pkt = Packet::createWrite(req);
+
+    uint32_t x = 0xdeadbeef;
+    pkt->dataStatic(&x);
+    //    pkt->setData((const uint8_t *)&x);
+
+    Tick t = memPort.sendAtomic(pkt);
+    std::cout << "sendAtomic write " << t << " ticks." << std::endl;
+}
+
+void SimpleObject::startup()
+{
+    if (!isread) {
+        writeAtomic();
+    } else {
+        schedule(event, 40000);
+    }
+
+}
+
 SimpleObject*
 SimpleObjectParams::create()
 {