AT_HEAPSIZE
pool_init(&at_heap_4_pool, AT_HEAPSIZE(4), 0, IPL_SOFTNET, 0,
pool_init(&at_heap_8_pool, AT_HEAPSIZE(8), 0, IPL_SOFTNET, 0,
heap = calloc(1, AT_HEAPSIZE(table.at_bits));
kread((u_long)kheap, heap, AT_HEAPSIZE(table.at_bits));