公开(公告)号：CA1313424C

公开(公告)日：1993-02-02

申请号：CA587711

申请日：1989-01-06

Applicant: IBM

Inventor： BAUM RICHARD I ,  BORDEN TERRY L ,  BUTWELL JUSTIN R ,  CLARK CARL E ,  GANEK ALAN G ,  LUM JAMES ,  MALL MICHAEL G ,  PAGE DAVID R ,  PLAMBECK KENNETH E ,  SCALZI CASPER A ,  SCHMALZ RICHARD J

IPC: G06F12/08 ,  G06F9/46 ,  G06F12/10 ,  G06F12/14 ,  G06F21/24

Abstract: PO9-87-006 NONHIERARCHICAL PROGRAM AUTHORIZATION MECHANISM A program authorization mechanism for authorizing access to an address space in the main memory of a computer system by a program being run under a multiple address space facility. An access-list entry is associated with each address space, each access-list entry being designated by an access list-entry token contained in an access register. Each access-list entry includes a private indicator which indicates if the associated address space can be accessed by all programs from this access-list entry or if the associated address space can only be accessed by an authorized program. For a program to be authorized, an extended authorization index in a control register must match an access-list extended authorization index in the access-list entry, or the extended authorization index value must be authorized in an authority table associated with the address space. An instruction for testing a given extended authorization index for a given access-list-entry is also disclosed.

公开(公告)号：CA1293811C

公开(公告)日：1991-12-31

申请号：CA583573

申请日：1988-11-18

Applicant: IBM

Inventor： CLARK CARL E ,  GANEK ALAN G ,  MALL MICHAEL G ,  PAGE DAVID R

IPC: G06F12/08 ,  G06F9/46 ,  G06F12/02 ,  G06F12/10 ,  G06F12/14

Abstract: PO987-007 DOMAIN RELATED ACCESS LISTS A method and apparatus is provided to translate the contents of access registers into information for use in performing addressing functions for multiple virtual address spaces. The access registers represent the full addressing capability of the system but do not directly contain the addressing information. The system has a plurality of general purpose registers, a plurality of access registers associated with the general registers, an access list having access list entries which is addressed by the contents of the access register, memory storage for holding address space number second table entries (ASTE), where the contents of the access list entry locate the ASTE and where the ASTE contains the addressing information needed to locate a virtual address when combined with the contents of a general register, Access register translation (ART) consists of the process of determining addressing information by using the access list entry and the ASTE. The system has available to it at any one time a selection of one of two domains each represented by an access list. One domain is related to the dispatchable unit task to be performed and the other is related to the address space in which a particular program operates. The ART process selects the domain which the access register is using.