On Wed, 25 Jun 2014 16:02:10 -0500, Mike Schwab wrote: >Boy, this is complicated. Too bad the 64 bit address could be >redefined to have a 16 bit ASID and 48 bit virtual address in a 64 bit >address field. It would limit z/OS to 64K ASIDs of 256TiB address >spaces. Would require hardware changes in a new model due in about 4 >years.
How would that be better than using access registers? Do you mean that when the high 16 bits are zero, that you would be accessing ASID 0? How would you control who can access which Address space? How would you deal with the reuse of an ASID? -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
