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