Authorization for selective program access to data in multiple a

Details Authorization for selective program access to data in multiple a Authorization for selective program access to data in multiple a

1988-02-10

1991-06-11

Lee, Thomas C.

Boots, shoes, and leggings

3642864, 3642865, 3642612, 3642467, G06F 1214

Patent

active

050237730

ABSTRACT:
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 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.

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