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Intel FRED Suffers A Late "Incompatible Change" To The Architecture
Intel FRED has been seeing Linux software enablement going on for the past three years
Intel FRED has been a long time coming with the initial public specification in 2022 and since then there has been work across the Linux kernel and compiler toolchains for preparing for the Flexible Return Event Delivery architecture and the new CPU instructions. Credit goes to Jennifer Miller and other contributors from Arizona State University whose research shows that placing ENDBR at entry points has negative value thus led to this change. This incompatible change to FRED is rather late with Intel said to be introducing this architecture with Panther Lake SoCs due out in the coming months followed by Diamond Rapids servers next year.
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