Switching between secure and non-secure processing modes

Details Switching between secure and non-secure processing modes Switching between secure and non-secure processing modes

2003-11-17

2010-12-07

Zia, Syed A. (Department: 2431)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Security kernel or utility

C713S150000, C713S166000, C713S187000, C726S002000, C726S003000, C726S004000, C726S027000, C726S028000

Reexamination Certificate

active

07849310

ABSTRACT:
A data processing system including a processor operable in a plurality of modes and in either a secure domain or a non-secure domain. The system includes at least one secure mode being a mode in the secure domain, at least one non-secure mode being a mode in the non-secure domain, and a monitor mode. When the processor is executing a program in a secure mode the program has access to secure data which is not accessible when the processor is operating in a non-secure mode. Switching between the secure and non-secure modes takes place via the monitor mode and the processor is operable at least partially in the monitor mode to execute a monitor program managing switching between the secure and non-secure modes.

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