diff options
Diffstat (limited to 'cpu/simple_cpu/simple_cpu.cc')
| -rw-r--r-- | cpu/simple_cpu/simple_cpu.cc | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/cpu/simple_cpu/simple_cpu.cc b/cpu/simple_cpu/simple_cpu.cc index 476f28ea0..4b9a7c6bd 100644 --- a/cpu/simple_cpu/simple_cpu.cc +++ b/cpu/simple_cpu/simple_cpu.cc @@ -212,6 +212,63 @@ SimpleCPU::execCtxStatusChg(int thread_num) { setStatus(Idle); } +void +SimpleCPU::setStatus(Status new_status) +{ + Status old_status = status(); + + // We should never even get here if the CPU has been switched out. + assert(old_status != SwitchedOut); + + _status = new_status; + + switch (status()) { + case IcacheMissStall: + assert(old_status == Running); + lastIcacheStall = curTick; + if (tickEvent.scheduled()) + tickEvent.squash(); + break; + + case IcacheMissComplete: + assert(old_status == IcacheMissStall); + if (tickEvent.squashed()) + tickEvent.reschedule(curTick + 1); + else if (!tickEvent.scheduled()) + tickEvent.schedule(curTick + 1); + break; + + case DcacheMissStall: + assert(old_status == Running); + lastDcacheStall = curTick; + if (tickEvent.scheduled()) + tickEvent.squash(); + break; + + case Idle: + assert(old_status == Running); + idleFraction++; + if (tickEvent.scheduled()) + tickEvent.squash(); + break; + + case Running: + assert(old_status == Idle || + old_status == DcacheMissStall || + old_status == IcacheMissComplete); + if (old_status == Idle && curTick != 0) + idleFraction--; + + if (tickEvent.squashed()) + tickEvent.reschedule(curTick + 1); + else if (!tickEvent.scheduled()) + tickEvent.schedule(curTick + 1); + break; + + default: + panic("can't get here"); + } +} void SimpleCPU::regStats() |