| 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 |
