What: /sys/kernel/boot_params
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Date: December 2013
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Contact: Dave Young <dyoung@redhat.com>
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Description: The /sys/kernel/boot_params directory contains two
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files: "data" and "version" and one subdirectory "setup_data".
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It is used to export the kernel boot parameters of an x86
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platform to userspace for kexec and debugging purpose.
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If there's no setup_data in boot_params the subdirectory will
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not be created.
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"data" file is the binary representation of struct boot_params.
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"version" file is the string representation of boot
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protocol version.
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"setup_data" subdirectory contains the setup_data data
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structure in boot_params. setup_data is maintained in kernel
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as a link list. In "setup_data" subdirectory there's one
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subdirectory for each link list node named with the number
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of the list nodes. The list node subdirectory contains two
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files "type" and "data". "type" file is the string
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representation of setup_data type. "data" file is the binary
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representation of setup_data payload.
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The whole boot_params directory structure is like below::
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/sys/kernel/boot_params
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|__ data
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|__ setup_data
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| |__ 0
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| | |__ data
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| | |__ type
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| |__ 1
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| |__ data
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| |__ type
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|__ version
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Users: Kexec
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