x86 isa: This patch attempts an implementation at mwait.

Mwait works as follows:
1. A cpu monitors an address of interest (monitor instruction)
2. A cpu calls mwait - this loads the cache line into that cpu's cache.
3. The cpu goes to sleep.
4. When another processor requests write permission for the line, it is
   evicted from the sleeping cpu's cache. This eviction is forwarded to the
   sleeping cpu, which then wakes up.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/src/cpu/checker/cpu.hh b/src/cpu/checker/cpu.hh
index d684b142b..49f44ff00 100644
--- a/src/cpu/checker/cpu.hh
+++ b/src/cpu/checker/cpu.hh
@@ -349,6 +349,13 @@ class CheckerCPU : public BaseCPU, public ExecContext
         this->dtb->demapPage(vaddr, asn);
     }
 
+    // monitor/mwait funtions
+    virtual void armMonitor(Addr address) { BaseCPU::armMonitor(address); }
+    bool mwait(PacketPtr pkt) { return BaseCPU::mwait(pkt); }
+    void mwaitAtomic(ThreadContext *tc)
+    { return BaseCPU::mwaitAtomic(tc, thread->dtb); }
+    AddressMonitor *getAddrMonitor() { return BaseCPU::getCpuAddrMonitor(); }
+
     void demapInstPage(Addr vaddr, uint64_t asn)
     {
         this->itb->demapPage(vaddr, asn);