System and method for modifying program status word system mask, system access key, and address space code with overlap enabled
US5345567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1991 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Jun 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3842
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for modifying program status words (PSW) with overlap enabled. According to the present invention, an instruction which modifies a PSW system mask, access key, or address space code is executed with overlap enabled. This instruction generates a new PSW. The new PSW is pushed into a queue. Once the instruction is complete, the new PSW becomes an architected PSW. If the instruction does not complete, then the new PSW is discarded. Once the new PSW is pushed into the queue, subsequent instructions may execute using the new PSW. Thus, instructions which modify the PSW system mask, access key, and address space code may execute with overlap enabled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.