Hi Wayne. Let's forget about AM32. There's no convenient way to add that. All the bits in BSM are taken already. I would like to be able to run a pure AM64 z/OS environment though.
You mentioned that AM32 would need to switch to AM31 because of the variable length parameters. That is not the case if the AM31 subroutine is updated to remove the high bit with N x'7FFFFFFF' instead of ignoring the bit or trying to remove it with LA. That's fine. That's part of the conversion effort to produce a pure AM64 site that runs both 32-bit and 64-bit programs. Better than Windows which can also do the same thing, but has to stuff around internally because x64 can't run 32-bit programs in 64-bit mode, but z/Arch CAN!!! Maybe this can be a selling point of z/Arch. Pure 64 is possible. BFN. Paul. On Fri, 11 May 2018 14:10:59 +0000, Wayne Driscoll <wdrisc...@rocketsoftware.com> wrote: >Paul, >Unlike Hercules, z/Architecture is part of a business, and, as such, a >business value needs to be made in order to get support for changes, in >particular radical changes like AM32. "it would be nice" and "but it's so >cool" aren't business rationalizations for the amount of potentially broken >customer code that would result from the change you propose. In order to not >have to recompile all applications, or maintain strict bounds between 32 bit >apps and 64 bit apps like most other 64 bit architectures, I will gladly >sacrifice 2 GiB out of the massive virtual space offorded by a 64 bit address >space. If your mythical AM32 was invented, applications would still have to >switch back to AM31 before calling other AM31 code that expects a variable >length paramter list. I still fail to see any business value to IBM's >customers in what you are proposing. > >Wayne Driscoll >Rocket Software >Note - All opinions are strictly my own. > > > >-----Original Messa-e----- >From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On >Behalf Of Paul Edwards >Sent: Friday, May 11, 2018 6:23 AM >To: IBM-MAIN@LISTSERV.UA.EDU >Subject: Re: GETMAIN LOC=32 > >On Fri, 11 May 2018 03:32:46 -0500, Paul Edwards <mutazi...@gmail.com> wrote: > >>ahat I did was provide an option such that any request to activate AM31 >>with BSM instead activates AM32. > >BTW, it would be good if z/Arch had a similar option. ie you can configure the >hardware so that any attempt to activate AM24 can be overridden to instead >activate AM31/32/64. >Similarly an override for any attempt to activate AM31, and a downgrade option >for >AM64 to activate AM24/31/32. > >That way you can set all the overrides to >AM64 and ensure that everything running >on your system is AM64-compliant, and >the system never leaves AM64. A z/OS >shop would become a pure AM64 >environment. > >Unlike Windowa and x64 hardware, 32-bit software can be run natively under >AM64. It doesn't need a special mode. Basically z/Arch hardware is superior to >x64 and this would be a great selling point I think - a pure 64-bit >environment, even when running 32-bit software. > >BFN. Paul. > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, send email to >lists...@listserv.ua.edu with the message: INFO IBM-MAIN >================================ >Rocket Software, Inc. and subsidiaries ■ 77 Fourth Avenue, Waltham MA 02451 ■ >Main Office Toll Free Number: +1 855.577.4323 >Contact Customer Support: >https://my.rocketsoftware.com/RocketCommunity/RCEmailSupport >Unsubscribe from Marketing Messages/Manage Your Subscription Preferences - >http://www.rocketsoftware.com/manage-your-email-preferences >Privacy Policy - http://www.rocketsoftware.com/company/legal/privacy-policy >================================ > >This communication and any attachments may contain confidential information of >Rocket Software, Inc. All unauthorized use, disclosure or distribution is >prohibited. If you are not the intended recipient, please notify Rocket >Software immediately and destroy all copies of this communication. Thank you. > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
