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the dataphysend calculation could only possibly work if the virtual buffer is also physically contiguous. Calculate dataphysend by calculating the ending virtual address first, then converting to a physical address. The second bug applies only to NetBSD and OpenBSD and involves the curlen calculation in the two-contiguous-physical-pages case (which we don't support). Also cleanup the use of the OHIC_PAGE() macro on dataphysend and add a panic if len goes negative (meaning we lost the physical page translation representing the end of the buffer). IMHO the dataphysend is still bokered since it might be misrepresented by shared userland page mappings. The whole section needs to be rewritten to use the virtual address range. MFC after: 3 days
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