Switching system for non-symmetrical sharing of computer peripheral equipment
Input/output processing system utilizing locked processors
Multi-processor data processing system
Data processing system including a program-executing secondary system controlling a program-executing primary system
Processing system with dual buses
Method and apparatus for enhancing the capabilities of a computing system
Memory apparatus for digital computer system
Parallel storage access by multiprocessors
Intelligent main store for data processing systems
ApplicationNo. 353116 filed on 05/17/1989
US Classes:714/11Concurrent, redundantly operating processors
ExaminersPrimary: Baker, Stephen M.
Attorney, Agent or Firm
International ClassG06F 011/20
AbstractThe functions of two virtual operating systems (e.g., S/370 VM, VSE or IX370 and S/88 OS) are merged into one physical system. Partner pairs of S/88 processors run the S/88 OS and handle the fault tolerant and single system image aspects of the system. One or more partner pairs of S/370 processors are coupled to corresponding S/88 processors directly and through the S/88 bus. Each S/370 processor is allocated from 1 to 16 megabytes of contiguous storage from the S/88 main storage. Each S/370 virtual operating system thinks its memory allocation starts at address 0, and it manages its memory through normal S/370 dynamic memory allocation and paging techniques. The S/370 is limit checked to prevent the S/370 from accessing S/88 memory space. The S/88 Operating System is the master over all system hardware and I/O devices. The S/88 processors access the S/370 address space in direct response to a S/88 application program so that the S/88 may move I/O data into the S/370 I/O buffers and process the S/370 I/O operations. The S/88 and S/370 peer processor pairs execute their respective Operating Systems in a single system environment without significant rewriting of either operating system. Neither operating system is aware of the other operating system nor the other processor pairs.