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The microcode_ctl package contains microcode files (vendor-provided binary data
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and/or code in proprietary format that affects behaviour of a device) for Intel
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CPUs that may be loaded into the CPU during boot.
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This directory contains information regarding various aspects of the provided
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microcode files and their usage.
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* LICENSE.intel-ucode
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"license" file from the Intel x86 CPU microcode archive.
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* README
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This file.
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* README.caveats
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Caveats (mechanism for enabling/disabling usage of sets of microcode files
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based on caveat configuration and user preferences) documentation.
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Also contains general information about microcode update behaviour and links
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with additional information about the relevant microarchitectural
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vulnerabilities.
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* README.intel-ucode
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"README.md" file from the Intel x86 CPU microcode archive.
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* RELEASE_NOTES.intel-ucode
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"releasenote.md" file from the Intel x86 CPU microcode archive.
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* SECURITY.intel-ucode
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"security.md" file from the Intel x86 CPU microcode archive.
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* SUMMARY.intel-ucode
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Information about supplied microcode files extracted from their headers,
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in a table form. Columns have the following meaning:
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* "Path": path to the microcode file under one of the following directories:
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* /usr/share/microcode_ctl/ucode_with_caveats/intel
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* /usr/share/microcode_ctl/ucode_with_caveats
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* /usr/share/microcode_ctl
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* /lib/firmware
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* /etc/firmware
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* "Offset": offset of the microcode blob within the micocode file in bytes.
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* "Ext. Offset": offset of the extended signature header within
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the microcode file in bytes.
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* "Data Size": size of microcode data in bytes. 0 means 2000 bytes.
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* "Total Size": size of microcode blob in bytes, incuding headers.
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0 means 2048 bytes.
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* "CPUID": CPU ID signature (in format returned by the CPUID instruction).
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* "Platform ID Mask": mask of suitable Platform IDs (provided in bits
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52..50 of MSR 0x17).
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* "Revision": microcode revision.
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* "Date": microcode creation date.
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* "Checksum": sum (in base 1<< 32) of all 32-bit values comprising
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the microcode (from Offset up to Offset + Total Size).
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* "Codenames": list of known CPU codenames associated with the CPUID
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and Platform ID Mask combination.
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Please refer to README.cavets, section "Microcode file structure"
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for additional information regarding microcode header fields.
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* caveats
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Directory that contains readme files for each specific caveat.
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