ref: 0132e7fed0ee48dae66607fbccd7c0ab1acea45e
parent: ed6b42863cbe71ec4ab31966bc23f5d84374f6b3
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Thu Apr 4 11:21:25 EDT 2019
pc64: get rid of TSTKTOP, USTKTOP is the end of user address space the temporary stack segment used to be at a fixed address above or below the user stack. these days, the temp stack is mapped dynamically by sysexec so TSTKTOP is obsolete.