Microprocessor providing isolated timers and counters for execution of secure code
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United States of America Patent
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Jun 24, 2014
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 providing for a secure execution environment is presented. The apparatus includes a microprocessor and a secure non-volatile memory. The a microprocessor is configured to execute non-secure application programs and a secure application program, where the non-secure application programs are accessed from a system memory via a system bus. The microprocessor has a plurality of timers which are visible and accessible only by the secure application program when executing in a secure execution mode. The secure non-volatile memory is coupled to the microprocessor via a private bus and is configured to store the secure application program in encrypted form. Transactions over the private bus between the microprocessor and the secure non-volatile memory are isolated from the system bus, the system memory, and corresponding system bus resources within the microprocessor.
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