On Tue, 8 May 2018 07:19:41 -0400, Don Poitras <sas...@sas.com> wrote:
>> 1. Add 20 lines of code to each system >> service so that they switch to AM31 >> themselves instead of requiring the >> program to do it itself. > >And how many lines of code to each system service to move the parms into >the first 2G? None whatsoever. Mandate that the caller is required to use LOC=31 or LOC=24 memory for parms, as is currently the case. > And don't forget that many parms are just pointers to >more areas that must be moved as well. AM64 isn't an easy port and >"32-bit programs" don't make it any easier. AM64 for 32-bit programs is not very hard, and it is something that should be done regardless for anyone developing 32-bit programs. ie not assuming that the top bit of a 32-bit register will be ignored. >> 2. Construct the 32-bit program so that >> whenever it is about to execute a system >> service like READ, it switches down to >> AM31 itself. > >And insure your own parms are in the first 2G (or even below the line, >for some services.) This is *already* the case for all 32-bit programs. Nothing needed to ensure. >64-bit is here. It's here on Windows, it's here on Linux, it's here >on z/VM, it's here on z/TPF, it's here on z/OS. I would _much_ rather >have IBM spend it's limitted resources dedicated to allowing more of >the OS to run 64-bit rather than create a Quasimodo, uh Quad-Modal... >OS. I am not asking for a quad-modal OS, I am asking for AM64 to be supported to the maximum extent possible. BFN. Paul. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
