Computer system and program creating device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 14, 2011
Grant Date -
Apr 23, 2009
app pub date -
May 30, 2006
filing date -
Jun 1, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Family
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