cpu: Enable fast-forwarding for MIPS InOrderCPU and O3CPU

A copyRegs() function is added to MIPS utilities
to copy architectural state from the old CPU to
the new CPU during fast-forwarding. This
addition alone enables fast-forwarding for the
o3 cpu model running MIPS.

The patch also adds takeOverFrom() and
drainResume() functions to the InOrderCPU to
enable it to take over from another CPU. This
change enables fast-forwarding for the inorder
cpu model running MIPS, but not for Alpha.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/cpu/inorder/cpu.hh b/src/cpu/inorder/cpu.hh
index 1183f6fc9..0104cb95f 100644
--- a/src/cpu/inorder/cpu.hh
+++ b/src/cpu/inorder/cpu.hh
@@ -866,6 +866,15 @@ class InOrderCPU : public BaseCPU
     Stats::Average instsPerCtxtSwitch;    
     Stats::Scalar numCtxtSwitches;
     
+    /** Resumes execution after a drain. */
+    void drainResume();
+
+    /** Switches out this CPU. */
+    virtual void switchOut();
+
+    /** Takes over from another CPU. */
+    virtual void takeOverFrom(BaseCPU *oldCPU);
+
     /** Update Thread , used for statistic purposes*/
     inline void tickThreadStats();