-- snip -- > :>Ed Jaffe asks... > :>> Out of curiosity, which software products allocate CSA in keys A- > :>> F? > > :>I know of one major vendor's storage management product that right up > :>until the last time I looked (more than a year ago) ran in key 10 > :>(X'A0') and used a bunch of CSA in key 10. The developers thought it was > :>clever. I didn't. > > While I don't condone it, I don't see the exposure (unless the standard zOS > problem state key mask includes key 10).
A V=R (ADDRSPC=REAL) job step is assigned a key from the 10-15 range. -- snip -- Could you guys clear up a few things for me. I've seen (E)CSA key 14 data in dumps. The fine manual states :- -- manual extract -- (referring to keys) 8-9 All V=V problem programs 10-15 V=R problem programs (each protected by a unique protection key) and also - The system assigns real frames upon request from a pool of available real frames, thereby associating virtual addresses with real addresses. Frames are repossessed upon termination of use, when freed by a user, when a user is swapped-out, or when needed to replenish the available pool. While a virtual page occupies a real frame, the page is considered pageable unless specified otherwise as a system page that must be resident in central storage. The system also allocates virtual equals central (V=R) regions upon request by those programs that cannot tolerate dynamic relocation. Such a region is allocated contiguously from a predefined area of central storage and is non-pageable. Programs in this region do run in dynamic address translation (DAT) mode, although real and virtual addresses are equivalent. -- manual extract -- Does that mean that a Job needs to have ADDRSPC=REAL on the job or step card in order to allocate storage in the key range 10-15? Can one assume that any authorised code can use the V=R keys with out specifiying ADDRSPC=REAL? The storage is non-pageable - but not fixed! What does this mean (other than the obvious!). Namely, what happens when storage is configured offline. Are these pages allocated in the preferred storage area? Is it really the case that real and virtual addresses are equivalent for these storage areas? Thanks John ---------------------------------------------------------------------- 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
