FIX_IOREMAP_BEGIN
FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1,
idx = FIX_IOREMAP_BEGIN + slot + nrpages - 1;
map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
idx0 = FIX_IOREMAP_BEGIN + slot;