公开(公告)号：CA1180464A

公开(公告)日：1985-01-02

申请号：CA417965

申请日：1982-12-17

Applicant: IBM

Inventor： BURK JOHN L ,  BUTWELL JUSTIN R ,  CLARK CARL E ,  RODELL JOHN T ,  STUCKI DAVID E

IPC: G06F12/14 ,  G06F13/00

Abstract: STORAGE FETCH PROTECT OVERRIDE CONTROLS This invention relates to the fetch protection of a critical area in the main storage (MS) of a data processing system. The critical area is smaller than, and contained within, the size of a main storage block protectable by a single storage protect key having a fetch protection field. This invention extends protect key operations for system/370 extended architectures that use 4KB pages. This invention recognizes that system integrity is enhanced by providing different types of fetch protection within the PSA page which cannot be done with the associated 4KB key. To enable different fetch protections within a special 4KB block, this invention provides fetch protect override controls to partly override the normal operation of the 4KB storage key for a page located at a predetermined real address in MS. While 4KB fetch protection is set on for the special page's 4KB block, the fetch protect override controls disable fetch protection for a portion of the special page's real addresses (e.g. addresses 0-2047). Override enablement is controlled by a fetch protect override control bit in a control register (e.g. bit 6 of control register 0).

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：CA1308202C

公开(公告)日：1992-09-29

申请号：CA584970

申请日：1988-12-05

Applicant: IBM

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

IPC: G06F12/08 ,  G06F9/46 ,  G06F12/02 ,  G06F12/10 ,  G06F12/1036 ,  G06F12/14

Abstract: PO98/-004 ACCESS REGISTER TRANSLATION MEANS FOR ADDRESS GENERATING MECHANISM FOR MULTIPLE VIRTUAL SPACES 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 translate a virtual address when combined with the contents of a general purpose register. Access register translation (ART) consists of the process of determining addressing information by using the access list entry and the ASTE. The results of the ART process are stored in an ART lookaside buffer (ALB) which stores the results of ART while valid for later use.

公开(公告)号：BR8900396A

公开(公告)日：1989-09-26

申请号：BR8900396

申请日：1989-01-31

Applicant: IBM

Inventor： BAUM RICHARD I ,  BORDEN TERRY L ,  CLARK CARL E ,  GANEK ALAN G ,  LUMI JAMES ,  MALL MICHAEL G ,  SCALZI CASPER A ,  SCHMALZ RICHARD J

IPC: G06F12/08 ,  G06F9/46 ,  G06F9/48 ,  G06F12/10 ,  G06F12/14 ,  G06F21/22

公开(公告)号：SK136193A3

公开(公告)日：1994-08-10

申请号：SK136193

申请日：1992-04-29

Applicant: IBM

Inventor： CLARK CARL E ,  SCALZI CASPER A ,  MALL MICHAEL G ,  SINHA BHASKAR

IPC: G06F12/14 ,  G06F21/24

Abstract: Provides three access levels of storage key protection, comprising a supervisory level (key 0), an intermediate level of non-public and non-supervisory keys (keys 1-8, 10-15), and an unique public level (key 9). The program routines operating with a supervisory-level access key can access both the public level and the intermediate level of storage blocks. Although a program routine operating with an access key in the intermediary access level cannot access any supervisory level storage block, it can access any block assigned a public level storage key, as well as any storage block assigned the respective intermediate level key. One or more third-level public storage keys (PSKs) may be provided. A program access key using one of the PSK values can only access blocks having the same PSK value, and it cannot access blocks having any other key value.

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.

公开(公告)号：PL170547B1

公开(公告)日：1996-12-31

申请号：PL30081092

申请日：1992-04-29

Applicant: IBM

Inventor： CLARK CARL E ,  MALL MICHAEL G ,  SCALZI CASPER A ,  SINHA BHASKAR

IPC: G06F12/14 ,  G06F21/24

Abstract: Provides three access levels of storage key protection, comprising a supervisory level (key 0), an intermediate level of non-public and non-supervisory keys (keys 1-8, 10-15), and an unique public level (key 9). The program routines operating with a supervisory-level access key can access both the public level and the intermediate level of storage blocks. Although a program routine operating with an access key in the intermediary access level cannot access any supervisory level storage block, it can access any block assigned a public level storage key, as well as any storage block assigned the respective intermediate level key. One or more third-level public storage keys (PSKs) may be provided. A program access key using one of the PSK values can only access blocks having the same PSK value, and it cannot access blocks having any other key value.

公开(公告)号：CA2064640C

公开(公告)日：1995-12-12

申请号：CA2064640

申请日：1992-04-01

Applicant: IBM

Inventor： CLARK CARL E ,  MALL MICHAEL G ,  SCALZI CASPER A ,  SINHA BHASKAR

IPC: G06F12/14 ,  G06F21/24 ,  G06F13/16

Abstract: Provides three access levels of storage key protection, comprising a supervisory level (key 0), an intermediate level of non-public and non-supervisory keys (keys 1-8, 10-15), and a unique public level (key 9). The program routines operating with a supervisory-level access key can access both the public level and the intermediate level of storage blocks. Although a program routine operating with an access key in the intermediate access level cannot access any supervisory level storage block, it can access any block assigned a public level storage key, as well as any storage block assigned the respective intermediate level key. One or more third-level public storage keys (PSKs) may be provided. A program access key using one of the PSK values can only access blocks having the same PSK value, and it cannot access blocks having any other key value.

公开(公告)号：CA1312142C

公开(公告)日：1992-12-29

申请号：CA584279

申请日：1988-11-28

Applicant: IBM

Inventor： BAUM RICHARD I ,  BORDEN TERRY L ,  CLARK CARL E ,  GANEK ALAN G ,  LUM JAMES ,  MALL MICHAEL G ,  SCALZI CASPER A ,  SCHMALZ RICHARD J

IPC: G06F12/08 ,  G06F9/46 ,  G06F9/48 ,  G06F12/10 ,  G06F12/14 ,  G06F21/22

Abstract: P0984011 LINKAGE MECHANISM FOR PROGRAM ISOLATION A computer system has general purpose registers, control registers and access registers for containing information to allow address space capability. A linkage stack uses protected address space to store state information during program call and program return operations. The linkage stack contains information relating to state entries for the saved information and header and trailer entries to point to other linkage stack sections. A control register contains the pointer to the current linkage stack entry and is changed as the program call or return moves through the stack.

公开(公告)号：CA2064640A1

公开(公告)日：1992-12-07

申请号：CA2064640

申请日：1992-04-01

Applicant: IBM

Inventor： CLARK CARL E ,  MALL MICHAEL G ,  SCALZI CASPER A ,  SINHA BHASKAR

IPC: G06F12/14 ,  G06F21/24 ,  G06F13/16

Abstract: Provides three access levels of storage key protection, comprising a supervisory level (key 0), an intermediate level of non-public and non-supervisory keys (keys 1-8, 10-15), and an unique public level (key 9). The program routines operating with a supervisory-level access key can access both the public level and the intermediate level of storage blocks. Although a program routine operating with an access key in the intermediary access level cannot access any supervisory level storage block, it can access any block assigned a public level storage key, as well as any storage block assigned the respective intermediate level key. One or more third-level public storage keys (PSKs) may be provided. A program access key using one of the PSK values can only access blocks having the same PSK value, and it cannot access blocks having any other key value.