Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / ABI / testing / sysfs-kernel-boot_params

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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