> > One idea would be to have a structure of function pointers for each
> > CPU that gets runtime patched into the right places,
> > similar to how we do some of the MMU fixups.
>
> Sounds good to me :-)
Except the indirect jump/call is almost certainly
never predicted - so will be slow.
You might want to patch jump instructions instead.
The same is true for in-kernel memcpy() and other
similar operations.
I actually wonder sometimes what the typical lengths
are for these sort of functions, and whether, in fact,
small lengths dominate - where the fixed costs matter.
David
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