On 6/27/2013 8:25 AM, Paul Gilmartin wrote:
This thread appears to have drifted from a discussion of 7FFFF000
to a discussion of PSA. But a search of z/OZ publibz for the former
finds a few tantalizing references such as:
...
152 (98) ADDRESS 4 OUCBWORKQTOKEN
Server Environment
Address Space Queue
Entry pointer or
7FFFF000
... but no definitive statement that that page is forever excluded,
nor whether it's a hardware or software feature, and of course no
mention of other operating systems.
Is there any such restricted address in AMODE 24?
This was discussed in 2007 on IBM-MAIN.
MVS has guaranteed the 4K "hole" at 7FFFF000 since MVS/XA and will do
so in the future. IBM code depends upon it. There is no equivalent for
24-bit mode.
--
Edward E Jaffe
Phoenix Software International, Inc
831 Parkview Drive North
El Segundo, CA 90245
http://www.phoenixsoftware.com/
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