Processor with non-volatile mode enable register entering secure execution mode and encrypting secure program for storage in secure memory via private bus
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United States of America Patent
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Jun 26, 2012
Grant Date -
Nov 26, 2009
app pub date -
Oct 31, 2008
filing date -
May 24, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus including a microprocessor and a secure non-volatile memory. The microprocessor is a single integrated circuit disposed on a single die, and executes non-secure application programs and a secure application program. The secure application program is executed in a secure execution mode. The non-secure application programs are accessed from a system memory via a system bus. The microprocessor has a non-volatile enabled indicator register that is configured indicate whether the microprocessor is within the secure execution mode or a non-secure execution mode, where contents of the non-volatile enabled indicator register persist through power removal and reapplication to the microprocessor. The secure non-volatile memory is coupled to the microprocessor via a private bus and is configured to store the secure application program, where transactions over the private bus between the microprocessor and the secure non-volatile memory are isolated from the system bus and corresponding system bus resources within the microprocessor.
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