========================================================== -----Original Message----- From: "Gerhard Postpischil" <[EMAIL PROTECTED]> Sent: 7/20/2006 3:53 PM To: "[email protected]" <[email protected]> Subject: Re: Why is zSeries so CPU poor?
Jeffrey D. Smith wrote: > When TRAP2/TRAP4 was first released on the P390 (sometime > around circa 1998-1999 IIRC), it was broken (storing into > the TRAPSA in the primary space instead of the home space). And I still wonder why they defined the traps the way they did - for my use it would have been easier to treat them as NOPR/NOP when trapping is off. That would allow debugging of LPA resident routines that don't fail when in a steplib (and I've had some of those). Gerhard Postpischil Bradford. ========================================================== The TRAP2/TRAP4/RP facility is flawed, but still usable in most cases. TRAP should have the option to turn off automatically the trap enablement bit and the option to store into the trapsa with a key in the duct (or trapcb). The resume program (RP) instruction should have a semi-privileged option to turn on trap enablement, as well as setting the key and state bits in the new psw. Jeffrey D. Smith Farsight Systems Corporation 24 BURLINGTON DR LONGMONT, CO 80501 303-774-9381 direct 303-709-8153 cell 303-484-6170 fax ---------------------------------------------------------------------- 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
