Information security – Prevention of unauthorized use of data including prevention... – Access control
Reexamination Certificate
2003-03-07
2008-10-07
Sheikh, Ayaz (Department: 2131)
Information security
Prevention of unauthorized use of data including prevention...
Access control
C726S034000, C710S036000
Reexamination Certificate
active
07434264
ABSTRACT:
A flexible peripheral access protection mechanism within a data processing system (10, 100). In one embodiment, each master (14, 15) within the data processing system (10) includes a corresponding privilege level modifier (70, 74) and corresponding trust attributes (71, 72, 75, 76) for particular bus access types (e.g. read and write accesses). Also, in one embodiment, each peripheral (22, 24) within the data processing system (10) includes a corresponding trust attribute (80, 84), write protect indicator (81, 85), and a privilege protect indicator (82, 86). Therefore, in one embodiment, a bus access by a bus master to a peripheral is allowed when the bus master has the appropriate privilege level and appropriate level of trust required by the peripheral (and the peripheral is not write protected, if the bus access is a write access). Also, through the use of the privilege level modifiers, a the bus master can be forced to a particular privilege level for a particular bus access.
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Circello Joseph C.
Moyer William C.
Shaw Craig D.
Chiu Joanna G.
Freescale Semiconductor Inc.
Henning Matthew T
Hill Susan C.
Sheikh Ayaz
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