Security mode switching via an exception vector

Details Security mode switching via an exception vector Security mode switching via an exception vector

2007-12-04

2007-12-04

Jung, David (Department: 2134)

Information security

Prevention of unauthorized use of data including prevention...

Access control

C712S244000, C726S021000

Reexamination Certificate

active

10714563

ABSTRACT:
There is a provided a data processing system comprising:a processor operable in a plurality of modes and either a secure domain or a non-secure domain including:at least one secure mode being a mode in said secure domain; andat least one non-secure mode being a mode in said non-secure domain;whereinwhen said processor is executing a program in a secure mode said program has access to secure data which is not accessible when said processor is operating in a non-secure mode; and whereinsaid processor is responsive to a switching request to initiate a switch between a secure mode and a non-secure mode under control of a mode switching program starting at a location specified by an exception vector associated with said switching request.

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