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Can't use bus_space_map/bus_space_unmap in interrupt context, where Linux uses this io_mapping abstraction. Instead, do uvm_km_alloc up front and then use bus_space_mmap/pmap_kenter_pa to map it. XXX Should bus_space_reserve the region (but that's x86-only for now). XXX Should use direct map if possible. XXX Should set an MTRR WC too in case of direct map or no PAT.
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