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OverviewThis chapter describes the Safer Mode Extensions (SMX) for the Intel® 64 and IA-32 architectures. Safer Mode Extensions (SMX) provide a programming interface for system software to establish a measured environment within the platform to support trust decisions by end users. The measured environment includes:• Measured launch of a system executive, referred to as a Measured Launched
Environment (MLE). The system executive may be based on a Virtual Machine Monitor (VMM); a measured VMM is referred to as MVMM.• Mechanisms to ensure the above measurement is protected and stored in a secure location in the platform.• Protection mechanisms that allow the VMM to control attempts to modify the VMM.The measurement and protection mechanisms used by a measured environment are supported by the capabilities of an Intel® Trusted Execution Technology (Intel® TXT) platform:• The SMX are the processor’s programming interface in an Intel TXT platform.• The chipset in an Intel TXT platform provides enforcement of the protection mechanisms.• Intel® Trusted Platform Module (Intel® TPM) 1.2 in the platform provides platform configuration registers (PCRs) to store software measurement values.Read the full Intel® 64 and IA-32 Architectures Developer's Manual: Vol. 2C.
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