Method and apparatus for secure context switching in a...

Details Method and apparatus for secure context switching in a... Method and apparatus for secure context switching in a...

2011-06-28

2011-06-28

Rutz, Jared I (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C712S229000

Reexamination Certificate

active

07971018

ABSTRACT:
A method and a secure mode controller are provided for controlling context switching between secure and user modes in a processing system including a processor and a memory management unit. The method comprises monitoring the memory management unit to detect a non-cache access to an entry point address that contains a secure mode entry instruction, verifying, in response to detection of the entry point address, that the secure mode entry point instruction is executed by the processor, and enabling context switching from the user mode to the secure mode in response to verifying that the secure mode entry instruction is executed by the processor. Each cache line of an instruction cache and a data cache may have a tag containing a secure bit to identify a secure cache line or a non-secure cache line.

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