Messages in this thread | | | Subject | Re: [RFC, PATCH 16/24] i386 Vmi io header | From | (Eric W. Biederman) | Date | Wed, 15 Mar 2006 14:17:32 -0700 |
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Zachary Amsden <zach@vmware.com> 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.
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