Zachary Amsden <[email protected]> writes:
> Move I/O instruction building to the sub-arch layer. Some very crafty
> but esoteric macros are used here to get optimized native instructions
> for port I/O in Linux be writing raw instruction strings. Adding a
> wrapper layer here is fairly easy, and makes the full range of I/O
> instructions available to the VMI interface.
>
> Also, slowing down I/O is not a useful operation in a VM, so there
> is a VMI call specifically to allow making it a NOP. I could find
> no place where SLOW_IO_BY_JUMPING is still used, and consider it
> obsoleted. Even on older 386 systems, the I/O delay approximation
> by touching the extra page register is likely to better.
This sounds like a prime candidate for the alternate instruction interfaces
and I don't see that being used here.
Eric
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