CPU specific Idle() function in locore_subr.S

[Tim Kelly <hockey%dialectronics.com@localhost>]

Would it be possible to implement a CPU specific function either as Idle()
or within Idle() for MSR[POW] save? In looking over the code, there is no
HID setting for MPC7447A, which has dynamic frequenct switching, and the
code doesn't appear to be consistent with the MPC7450 User's Manual, which
says that a dssall and sync must be executed before mtmsr and a "context
switching" instruction afterward (and power save mode is not used for this
family, according to cpu_subr.c).

Since checking the specific CPU each time before entering power save mode
would add a lot of overhead, what about installing a CPU specific handler
that gets called to handle entering power save mode? If this meets general
approval, I don't mind trying my hand at writing it. If the idea doesn't
meet approval, I'll find a more port specific solution.

thanks in advance,
tim