_BUS_AVAIL_END
#define _BUS_AVAIL_END (physical_end - 1)
#define _BUS_AVAIL_END (pmap_limits.avail_end - 1)
#define _BUS_AVAIL_END physical_end
#define _BUS_AVAIL_END (avail_end - 1)
#define _BUS_AVAIL_END ((bus_addr_t)0xffffffffffffffff)
#define _BUS_AVAIL_END ((bus_addr_t)0xffffffff)