[issue1359] PowerNow! support

[Alex Hornung (via DragonFly issue tracker)]

Alex Hornung <ahornung at gmail.com> added the comment:

It seems that Sascha's BIOS doesn't provide AMDK7PNOW! string in PSB, so it 
probably will never work. 
But I have noticed that you currently only support version 0x14 of speedstep. 
Looking through NetBSD's and FreeBSD's code it seems like 0x12 version has only 
some slight variations and should be trivial to implement, too in 
k8pnow_states().
What I'm getting at is that it would be nice if you could add support for that, 
too. 
As for the rest it seems ok now with that memory leak and null pointer free 
fixed, but it would be great if some more people could try it.

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