Fix critical input interrupt generation.


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  (crash reported by Andreas Farber when using default CPU).


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 (problem reported by Andreas Farber).
: ----------------------------------------------------------------------


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- New mtmsr/mtmsrd form that just update RI and EE bits
- New hrfid, lq and stq instructions
- Add support for supervisor and hypervisor modes process priority update
- Code provision for hypervisor SPR accesses
* Actually implement the wait instruction
* Bugfixes (missing RETURN in micro-op / missing #ifdef)


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* fix invalid instructions bits masks
* new wait instruction
* more comments about effect of cache instructions on the MMU


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This is a rework of Stefan Weil proposed patch.


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  as defined in the PowerPC 2.04 specification.


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  as the PowerPC registers only store double-precision floats,
  use float64_to_float32 & float32_to_float64 to do the appropriate conversion.
Implement stfiwx.


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  according to the PowerPC 2.04 specification.


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Share most code with the time-base management routines.
Remove time-base write routines from user-mode emulation environments.


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avoid stopping translation after most SPR updates
when a context-synchronization instruction is also needed.


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 as described in PowerPC 2.04 specification.


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* don't use exception vectors as the exception number.
  Use vectors numbers as defined in the PowerPC embedded specification instead
  and extend this model to cover all emulated PowerPC variants exceptions.
* add some missing exceptions definitions, from PowerPC 2.04 specification
  and actual PowerPC implementations.
* add code provision for hypervisor exceptions handling.
* define exception vectors and prefix in CPUPPCState to emulate BookE exception
  vectors without any hacks.
* define per CPU model valid exception vectors.
* handle all known exceptions in user-mode only emulations.
* fix hardware interrupts priorities in most cases.
* change RET_EXCP macros name into GEN_EXCP as they don't return.
* do not stop translation on most instructions that are not defined as
  context-synchronizing in PowerPC specification.
* fix PowerPC 64 jump targets and link register update when in 32 bits mode.
* Fix PowerPC 464 and 464F definitions.


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