Zachary Amsden <zach@xxxxxxxxxx> 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
