> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
> Behalf Of Paul Schuster
> Sent: Tuesday, July 24, 2007 12:33 AM
> To: [email protected]
> Subject: Is a page protected?--how to determine
>
> Hello: I have a need to determine if an address in storage is page
> protected
> in order to determine if a PGSER UNPROTECT needs to be done.
>
> The best I have tried and seen in earlier posts is to look for a CC=1 on a
> TPROT backed up with an ESTAE.
>
> Are there any other methods to do this?
>
> Thank you.
>
> Paul Schuster
Use a loop with IVSK and TPROT for key 0. Something like this:
L R2,page_address
LOOP BR 0 purge cache
IVSK R0,R2 page-in
TPROT 0(R2),0 test for key zero storability
BO LOOP oops, paged-out. try again
BNZ PROT page protected, LAP, read-only data space
BZ NO_PROT not protected
Testing for key zero storability will catch page protection, or
low address protection, or read-only data space. You may want
to provide special filtering for those weird cases.
Jeffrey D. Smith
Principal Product Architect
Farsight Systems Corporation
700 KEN PRATT BLVD. #204-159
LONGMONT, CO 80501-6452
303-774-9381 direct
303-484-6170 FAX
http://www.farsight-systems.com/
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