Continuing his reverse-engineering of the Intel 8087, [Ken Shirriff] covers the conditional tests that are implemented in the microcode of this floating point processing unit (FPU). This microcode ...
Video gamers know about cheat codes, but assembly language programmers are often in search of undocumented instructions. One way to find them is to map out all of a CPU’s opcodes and where there are ...
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My understanding was that a CPU microcode update is stored in non-volatile memory on the motherboard and is loaded by the BIOS or UEFI into volatile memory on the CPU during boot. And because the ...
Gregory Tang and Rajat Bahl, AMD, Inc. Alex Wakefield and Padmaraj Ramachandran, Synopsys Inc. As microprocessor designs have grown considerably in complexity, the use of hand-written directed tests ...
In a nutshell: Google researchers recently disclosed a stealthy security flaw dubbed "EntrySign" that allowed malicious code execution through unsigned microcode patches on AMD processors from Zen 1 ...
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AMD Zen 5 CPUs also affected by microcode vulnerability — Granite Ridge, Turin, Ryzen AI 300, and Fire Range at risk
Last month, the Google Security Team identified a security vulnerability in AMD's CPUs ranging from Zen 1 to Zen 4 dubbed "EntrySign" that allowed malicious users with ring 0 access to load unsigned ...
In context: Microcode is machine instruction sets that load from the BIOS. It acts much like firmware for the PC's processor. According to MSI Marketing Director Eric van Beurden, AMD will be ...
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