Idle Proc

I've been running inferno native in VmWare fusion.  I am using our
plan 9 environment PXE boot it which works well.  I noticed that my
laptop, an apple MacBook Pro, was overheating when running the inferno
guest.  I've seen this once behavior once before where the OS I was
playing with lacked the cpu HLT instruction in the idle process.

Is this missing form the native inferno kernel?  If so is it intentional?

Ian