MAP_START
pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
td->ip = MAP_START + td->foo;
td->addr = MAP_START + td->bar;
if (write_mmap(td->fd, pid, tid, MAP_START, 0x10000, 0, td->prog_file_name)) {