Computer system and program creating device
US7962746B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2006 |
| Grant date | Jun 14, 2011 |
| Priority date | — |
| Expiry date | Sep 27, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/74
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A mobile telephone includes a CPU that obtains and decodes instructions included in an OS, a nonsecure program, a switch device driver, and a secure program, and operates according to the decoding results. A memory includes a controlled area and an uncontrollable area. The OS has only the controlled area as its access space, and includes an instruction for mediating access of the nonsecure program to the controlled area and an instruction for instructing the switch device driver to make a switch to the secure program. The nonsecure program includes an instruction to access the controlled area via the OS. The switch device driver includes an instruction to make a switch from execution of the OS to execution of the secure program in response to an instruction of the OS. The secure program has only the uncontrollable area as its access space, and includes an instruction to access the uncontrollable area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.