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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!USCMVSA.BITNET!LDW
- Message-ID: <IBM-MAIN%92110901472721@RICEVM1.RICE.EDU>
- Newsgroups: bit.listserv.ibm-main
- Date: Sun, 8 Nov 1992 23:43:00 PST
- Sender: IBM Mainframe Discussion list <IBM-MAIN@RICEVM1.BITNET>
- From: Leonard D Woren <LDW@USCMVSA.BITNET>
- Subject: Re: STORAGE BELOW 16M LINE
- Lines: 17
-
- On Thu, 5 Nov 1992 11:08:13 CET,
- Christian.J.Reichetzeder@AWIIMC12.IMC.UNIVIE.AC.AT said:
- > On Wed, 4 Nov 1992 16:07:00 PST Leonard D Woren said:
- > >Hah! Try doing an LRA for page 0 when you're running V=R. [...]
- > Interesting - shouldn't it always be in the range 0-4k?
-
- You would think so, but page 0 in a V=R machine is a special case.
- I'm sure it has something to do with prefixing. I never researched it
- in detail after fixing a program to account for this case. The
- program displays storage, including the storage key. The ISKE was
- failing on addresses in the first 4K. Finally I decided to look at
- the real address returned by LRA, and discovered that in a 4M V=R
- guest (this was under VM/SP or HPO, R3, on a 4381), LRA on an address
- of 0 returned X'00400000'. ISKE then failed on this. The fix was to
- skip the LRA if the address was < X'1000'.
-
- /Leonard
-