That's why some (older) vendor code was required to be loaded into FLPA with no page protect.
Jon L. Veilleux [EMAIL PROTECTED] (860) 636-2683 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of McKown, John Sent: Wednesday, July 25, 2007 1:55 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: Is a page protected?--how to determine > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Binyamin Dissen > Sent: Wednesday, July 25, 2007 12:28 PM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: Is a page protected?--how to determine > > > On Wed, 25 Jul 2007 12:08:42 -0500 Paul Schuster > <[EMAIL PROTECTED]> > wrote: > > :>On Wed, 25 Jul 2007 07:27:15 -0400, Peter Relson <[EMAIL PROTECTED]> > wrote: > :> > :>>OK, I'll bite. Why do you "need to determine"? > :>> > :>>If you have any reason to think that the page is protected > (presumably :>>because you did it or might have done it), then you can > just unprotect it. > :>>A page does not need to be protected in order to successfully > unprotect. > :>>Note that protection is not a "count" it is a "toggle". > Two protects > :>>followed by one unprotect leaves the page not protected.. > > :>The need is based on stuff that can be put into key-0 CSA > -or- into dynamic > :>LPA during install time, and is briefly updated after it has been > put into :>CSA or dynamic LPA. Since the dynamic LPA is protected, it > needs to be :>unprotected and then reprotected, but the CSA needs > neither. Hence the :>'need to determine'. > > I wonder if ASM/VSM checks for modified page-protected LPA. > > -- > Binyamin Dissen <[EMAIL PROTECTED]> >From what I remember from the deep-dark-past, LPA is never paged-out. So if something modifies an LPA page, then it must also do a PGFIX so that the frame in which it resides is never used for anything else. I remember a type 3 SVC which did an "initialization" of itself upon the first execution. The updated data area within the SVC code had to be page fixed and the comment was "or else the data is lost if the frame is ever reused due to low activity." -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html This e-mail may contain confidential or privileged information. If you think you have received this e-mail in error, please advise the sender by reply e-mail and then delete this e-mail immediately. Thank you. Aetna ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
