Thiemo Seufer wrote:
Dirk Behme wrote:
Fabrice Bellard wrote:
You should add a runtime selection system : see the ARM and PowerPC
targets (I would prefer a parameter to cpu_init(). It was not done that
way on PowerPC for legacy reasons). Each machine should be able to
select the processor it needs (and allow the user to change it if
needed, but it is not the main point).
It might be interesting for MIPS to decouple Machine and CPU somewhat.
E.g. the Malta board supports a number of different 32- and 64-bit CPUs.
Each machine can add specific support for that (for example a -cpu
option). It is likely to come at least for the PC machines.
There is no good reason to make
the selection at compile time because the translator can efficiently
handle any CPU differences at runtime.
I'm a bit dubious about this argument, each instruction needs to be
checked agains a tuple of values. How much performance loss would be
acceptable?
It slows down the translator a bit, but most of the time is spent in the
generated code, not in the translator (otherwise there is no point in
doing dynamic translation !).
[...]
Unfortunately it is not that simple. We have the upward-compatible ISAs:
>[...]
I add suggest one more parameter to cpu_mips_set_model() to specify
optional features. A function converting a CPU "string id" into an id +
features would be interesting too.
Fabrice.
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