O3,ARM: fix some problems with drain/switchout functionality and add Drain DPRINTFs

This patch fixes some problems with the drain/switchout functionality
for the O3 cpu and for the ARM ISA and adds some useful debug print
statements.

This is an incremental fix as there are still a few bugs/mem leaks with the
switchout code. Particularly when switching from an O3CPU to a
TimingSimpleCPU. However, when switching from O3 to O3 cores with the ARM ISA
I haven't encountered any more assertion failures; now the kernel will
typically panic inside of simulation.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/mem/port.cc b/src/mem/port.cc
index 36ca6304a..3827994fb 100644
--- a/src/mem/port.cc
+++ b/src/mem/port.cc
@@ -82,6 +82,12 @@ MasterPort::getSlavePort() const
 }
 
 void
+MasterPort::unBind()
+{
+    _slavePort = NULL;
+}
+
+void
 MasterPort::bind(SlavePort& slave_port)
 {
     // master port keeps track of the slave port
@@ -167,6 +173,12 @@ SlavePort::~SlavePort()
 }
 
 void
+SlavePort::unBind()
+{
+    _masterPort = NULL;
+}
+
+void
 SlavePort::bind(MasterPort& master_port)
 {
     _masterPort = &master_port;