+        * We must write a positive value to the decrementer to clear
+        * the interrupt on the IBM 970 CPU series.  In periodic mode,
+        * this happens when the decrementer gets reloaded later, but
+        * in one-shot mode, we have to do it here since an event handler
+        * may skip loading the new value...

Nothing special about 970 here -- on *every* PowerPC,
a decrementer exception exists as long as the high
bit of the decrementer equals 1.  BookE is different
of course.  Some other CPUs might deviate from the
architecture as well.


Segher

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