Just FYI, this was written over a year ago and never tested since it
pre-dated KVM support on P9. It's possible the real mode KVM bits have
grown an extra decremented usages since then. If so they will probably
need updating to use the GET_DEC() macro.
On Mon, May 22, 2017 at 1:55 PM, Oliver
Power ISAv3 extends the width of the decrementer register from 32 bits.
The enlarged register width is implementation dependent, but reads from
these registers are automatically sign extended to produce a 64 bit
output when operating in large mode. The HDEC always operates in large
mode while the
