Secure computing device including operating system stored in non-relocatable page of memory
US6266754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | May 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/1097
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A diagnostic program can check the security of a program. The program is stored at predetermined non-relocatable physical address in memory. The diagnostic program is loaded and checks the program at the predetermined physical address against a standard. The diagnostic program then indicates that the program is verified as secure if it meets the standard or non-verified as secure if it does not meet the standard. If the program is not verified as secure, then the diagnostic program may take remedial action such as disabling normal operation of the program, be transmitting a predetermined message via the system modem or downloading another copy of the program via the modem. The program is made non-relocatable using a special table look-aside buffer having a fixed virtual address register and a corresponding fixed physical address register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.