Isolated multiprocessing system having tracking circuit for veri

Details Isolated multiprocessing system having tracking circuit for veri Isolated multiprocessing system having tracking circuit for veri

1994-09-20

1996-08-27

An, Meng-Al

Boots, shoes, and leggings

395474, 39518501, 3649446, 3649454, 3649472, 364960, 3649607, 3649752, 364DIG2, G06F 1500, G06F 1200, G06F 1312

Patent

active

055510515

ABSTRACT:
A computer (20) includes a hardware memory access enforcer (50) to insure that various independent programs (52, 54) operating on the computer (20) follow isolated processing rules. Each program has its own memory domain (56), which may extend across instruction, data, and I/O memory spaces (40, 42, 44). A system controller program (52) is a trusted process. The system controller (52) may access memory in the domain (56) of any application (54), and program flow may exit system controller (52) to any application (54). However, applications (54) cannot access memory outside of their own domains (56), and program flow may not exit applications (54) to enter other applications (54). Program flow may exit applications (54) to system controller (52) only if directed to an entry address (60). A tracking circuit (74) verifies that a microprocessor (22) actually executes entry instructions (94) located at the entry address (60).

REFERENCES:
patent: 3573855 (1971-04-01), Cragon et al.
patent: 3827029 (1974-07-01), Schlotterer et al.
patent: 4030073 (1977-07-01), Armstrong, Jr.
patent: 4087856 (1978-05-01), Attanasio
patent: 4298934 (1981-11-01), Fischer
patent: 4716586 (1987-12-01), Bauer
patent: 4729091 (1988-03-01), Freeman et al.
patent: 5109522 (1992-04-01), Lent et al.
patent: 5168566 (1992-12-01), Kuki et al.
patent: 5237616 (1993-08-01), Abraham et al.
patent: 5274815 (1993-12-01), Trissel et al.
patent: 5341497 (1994-08-01), Younger
patent: 5418953 (1995-05-01), Hunt et al.

Affiliated with

Also associated with

Rating

Isolated multiprocessing system having tracking circuit for veri does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Isolated multiprocessing system having tracking circuit for veri, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isolated multiprocessing system having tracking circuit for veri will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1063899