McKown, John wrote:
But there must be some way for the dispatcher to somehow know that CPU#n is a zIIP or a zAAP as opposed to a general CP. Otherwise how would the dispatcher know not to dispatch general work onto that CPU? I would guess that there is something in the PCCA(?) that says "this is a zIIP" or "this is a zAAP". Which I guess would be determined via some instruction at NIP time? Just a wild guess on my part. Hum. If that is true along with what you said, then the easy way to dispatch general work onto a zIIP or zAAP would be to "zap" that flag so that the dispatcher would think the zIIP or zAAP was a general CP.
The processor type is queried via a DIAGNOSE instruction. This information is used to set the PCCAIFA (zAAP) and PCCAzIIP flags.
-- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 [email protected] http://www.phoenixsoftware.com/ ---------------------------------------------------------------------- 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
