Documentation/ABI/testing/sysfs-kernel-boot_params

Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-kernel-boot_params

File Facts

System: Linux kernel
Corpus path: Documentation/ABI/testing/sysfs-kernel-boot_params
Extension: [no extension]
Size: 1286 bytes
Lines: 40
Domain: Support Tooling And Documentation
Bucket: Documentation
Inferred role: Support Tooling And Documentation: Documentation
Status: atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

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

Annotation

Atlas domain: Support Tooling And Documentation / Documentation.
Implementation status: atlas-only.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.