BIG 2074 user/usertests.c amt = BIG - (uint64)a; BIG 2086 user/usertests.c lastaddr = (char*) (BIG-1); BIG 2191 user/usertests.c sbrk(BIG - (uint64)sbrk(0)); BIG 2225 user/usertests.c sbrk(10*BIG); BIG 2227 user/usertests.c for (i = 0; i < 10*BIG; i += PGSIZE) {