-@item addrspace.c
-@itemx addrspace.h
-An address space keeps track of all the data necessary to execute a
-user program. Address space data is stored in @code{struct thread},
-but manipulated only by @file{addrspace.c}. Address spaces need to
-keep track of things like paging information for the process (so that
-it knows which memory the process is using). Address spaces also
-handle loading the program into memory and starting up the process's
-execution.