> >For example, z/Architecture uses 64-bit addresses, so all of those > places where an > >address is defined are 64 bits wide. PSW address is an obvious one. > Also, the locations > >for the old and new PSW for SVC, I/O, External, Restart, Machine > Check, and Program > >interruptions now require 16 bytes. Dynamic Address Translation > tables (page and > >segment tables, etc.) require 64 bits for addresses. Likewise for > Control registers. > > > Does this imply no more scrunched PSWs? Execution above the bar > becomes possible? > 64-bit LPA?
For z/OS, it implies that there is absolutely no way that a release older than z/OS 1.12 could possibly IPL on the next generation of machines after the z13. And that is all that it implies for z/OS. Execution above the bar in z/OS has been supported since z/OS 1.13, with the restrictions that there is no concept of RMODE(64) yet, so you need to get the code loaded above the bar some other way, and very few system services document that they support being invoked from a program which resides above the bar. Some might work anyway. Others might not. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
