Apparatus and method for managing a microprocessor providing for a secure execution mode
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United States of America Patent
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Mar 10, 2015
Grant Date -
Nov 26, 2009
app pub date -
Oct 31, 2008
filing date -
May 24, 2008
priority date (Note) -
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Abstract
An apparatus providing for a secure execution environment including a microprocessor and a secure non-volatile memory. The microprocessor executes non-secure application programs and a secure application program. The non-secure application programs are accessed from a system memory via a system bus. The secure application program executes in a secure execution mode. The microprocessor has secure execution mode logic that monitors conditions corresponding to the microprocessor associated with tampering, and causes the microprocessor to transition to a degraded operating mode from the secure execution mode following detection of a first one or more of the conditions. The degraded operating mode exclusively provides for execution of BIOS instructions. The secure non-volatile memory is coupled to the microprocessor via a private bus, stores the secure application program. Transactions over the private bus are isolated from the system bus and corresponding system bus resources within the microprocessor.
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