- create real_phys_avail which includes all memory ranges to be added to the direct map
- merge in nucleus memory to real_phys_avail
- distinguish between tag VA and index VA in tsb_set_tte_real for cases where page_size != index_page_size
- clean up direct map loop
switch tsbscratch over to using order of number of pages as opposed to actual number of pages
switch tsb.c over to using wrappers for contig page allocation
